CN103199504A - Battery protection circuit with booster circuit - Google Patents
Battery protection circuit with booster circuit Download PDFInfo
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- CN103199504A CN103199504A CN201310134860XA CN201310134860A CN103199504A CN 103199504 A CN103199504 A CN 103199504A CN 201310134860X A CN201310134860X A CN 201310134860XA CN 201310134860 A CN201310134860 A CN 201310134860A CN 103199504 A CN103199504 A CN 103199504A
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Abstract
The invention provides a battery protection circuit with a booster circuit. The battery protection circuit comprises an electric core, an electrical inductor L1, a capacitor C1, a resistor R1, a first switch, a second switch and a booster-battery protection control circuit, wherein the booster-battery protection control circuit is used for controlling the switching state of the first switch and the second switch; when the voltage of an electric core node is greater than or equal to the minimum working voltage of the system, the booster-battery protection control circuit is used for controlling the second switch to be shut down and performing charging control and discharging control by controlling the first switch; when the voltage of the electric core node is greater than a discharging undervoltage threshold and less than the minimum working voltage of the system as well as free of suffering from the discharging overcurrent, the booster-battery protection control circuit is used for controlling the first switch and the second switch to be powered on alternately. The battery protection circuit is capable of performing the charging and discharging protection on the electric core as well as increasing the available energy of the electric core when the electric core Bat is used for supplying power for an electric system, so that the working time and the standby time of the power supply system to be powered are prolonged.
Description
[technical field]
The present invention relates to circuit design field, particularly a kind of battery protecting circuit with booster circuit.
[background technology]
In the prior art, lithium battery guarantees the not under-voltage discharge of electric core in the battery by being installed in its inner battery protecting circuit (perhaps being called the battery protection chip), not overvoltage charging, but banish.Please refer to shown in Figure 1, its be in the prior art lithium battery at the circuit diagram in when power supply.Described lithium battery comprises electric core Bat and battery protecting circuit 110.Described battery protecting circuit 110 comprises resistance R 1, capacitor C 1, battery protection control circuit 112, resistance R 4, NMOS (N-channel Metal Oxide Semiconductor) field effect transistor M N1 and MN2.The positive pole of described electric core Bat directly links to each other with the first power end VDD, resistance R 1 and capacitor C 1 are series between the positive pole and negative pole of electric core Bat, nmos pass transistor MN1(is the discharge power switch) and nmos pass transistor MN2(be the charge power switch) be series between the negative pole and second source end PN of electric core Bat, the drain electrode of nmos pass transistor MN1 links to each other with the drain electrode of nmos pass transistor MN2, the source electrode of nmos pass transistor MN1 links to each other with the negative pole of electric core Bat, the source electrode of nmos pass transistor MN2 links to each other with second source end PN, and parasitic diode (not shown) in nmos pass transistor MN1, parasitism has the diode (not shown) in nmos pass transistor MN2.
Described battery protection control circuit 112 comprises three links (or being called the test side) and two control ends; three links are respectively electric core Bat anode connection terminal (or claiming power end) V; electricity core Bat negative pole link (or claiming earth terminal) G and second source end PN link VM, two control ends are respectively charging control end CO and discharge control end DO.Wherein, link V is connected between resistance R 1 and the capacitor C 1, and link G links to each other with the negative pole of electric core Bat, and link VM links to each other with second source end PN by resistance R 4, charging control end CO links to each other with the grid of nmos pass transistor MN2, and discharge control end DO links to each other with the grid of nmos pass transistor MN1.Described battery protection control circuit 112 can be realized electric core Bat is carried out charge protection and discharge prevention by the turn-on and turn-off of control nmos pass transistor MN1, MN2.When normal condition, described battery protection control circuit 112 control nmos pass transistor MN1, MN2 conducting simultaneously, this moment is both chargeable also can discharge.When unusual (such as charging overcurrent or charging overvoltage) took place in charging, described battery protection control circuit 112 control nmos pass transistor MN2 ended, thereby have cut off charging process, but still can discharge.When unusual (such as discharge overcurrent or discharge overvoltage) took place in discharge, described battery protection control circuit 112 control nmos pass transistor MN1 ended, thereby have cut off discharge process, but still can charge.
Lithium battery among Fig. 1 is powered for being powered circuit 130 by power management chip 120.In Fig. 1, an input of power management chip 120 links to each other with the first power end VDD, and another input links to each other with second source end PN, its output be powered circuit 130 and link to each other.Described power management chip 120 comprises a plurality of DC/DC (DC-DC) transducer and a plurality of LDO (low dropout regulator, low difference voltage regulator, be called for short LDO), with to the i.e. voltage of the first power end VDD of cell voltage VDD() carry out voltage transitions, thus export the described various system voltages that circuit 130 needs that are powered.For example generally be powered circuit 130(, portable electronic systems such as mobile phone and panel computer) in need in 1.2V～3.3V scope the multichannel multiple voltage (such as, many digit chips are with the IO (input and output: Input of 3.3V as interchip communication; Output) supply voltage of pin), general 3.3V is for being powered circuit 130(or being called the system of being powered) in ceiling voltage in the required fundamental voltage.Be input with lithium battery voltage VDD, produce the voltage of 3.3V by the low difference voltage regulator in the power management chip 120, if the minimum pressure reduction of low difference voltage regulator is 0.1V, then need cell voltage VDD could work more than or equal to 3.4V; Voltage when lithium battery is full of electricity is generally 4.2V, and along with progressively power consumption, its voltage descends gradually, so in the prior art, mobile phone and panel computer have just shut down when cell voltage drops to 3.4V, and cell voltage that also we can say 3.4V is the minimum operating voltage of system.But in fact, still there is certain energy in the electric core Bat in the battery in (between the minimum operating voltage of under-voltage threshold value and the system of namely discharging) between 2.7V～3.4V, accounts for to be full of 8%～10% of electric core energy.If this part energy is rationally utilized, can under the condition that does not increase electric core Bat volume and weight, effectively increase the battery available energy, thereby prolong operating time and the stand-by time of the system that is powered.
Be powered circuit 130 and can utilize the energy of electric core voltage between 2.7V～3.4V for making, need to increase booster circuit.In lithium battery shown in Figure 1, if simply booster circuit is connected on the input of power management chip 120, though can make and be powered circuit 130 and utilize the energy of electric core voltage between 2.7V～3.4V, but its effect is relatively poor, its reason is that there is certain loss in efficiency in booster circuit itself, and for example its efficient is 90%, then the energy of loss 10%, integrate the operating time that not only not to have to prolong the system that is powered like this, may reduce the operating time on the contrary.
Therefore, be necessary to provide a kind of improved technical scheme to overcome the problems referred to above.
[summary of the invention]
The object of the present invention is to provide a kind of battery protecting circuit with booster circuit; it not only can carry out charge protection and discharge prevention to electric core Bat; and when electric core Bat powers for the system that is powered, can increase the available energy of electric core Bat, thereby prolong operating time and the stand-by time of the system that is powered.
In order to address the above problem; the invention provides a kind of battery protecting circuit that has booster circuit; it comprises electric core, inductance L 1, capacitor C 1, resistance R 1, first switch, second switch and boosts-the battery protection control circuit; the electricity core is connected between electric core node and the ground node; inductance L 1 is connected between electric core node and the intermediate node; first switch is connected between intermediate node and first power end; second switch is connected between intermediate node and the ground node; capacitor C 1 and resistance R 1 are series between electric core node and the ground node, and the second source end links to each other with ground node.Described boosting-battery protection control circuit is used for the on off state of first switch and second switch is controlled, when the voltage of electric core node during more than or equal to the minimum operating voltage of system, described boosting-battery protection control circuit control second switch turn-offs, and realizes charging control and discharge control by control first switch; When the voltage of electric core node greater than the under-voltage threshold value of discharge and less than the minimum operating voltage of system and when the discharge overcurrent occurring, described boosting-battery protection control circuit is controlled first switch and second switch alternate conduction; When the voltage of electric core node greater than the under-voltage threshold value of discharge and less than the minimum operating voltage of system and when the discharge overcurrent occurring or the voltage of electric core node during less than the under-voltage threshold value of discharge; described boosting-battery protection control circuit is controlled first switch and is turn-offed discharge loop; wherein, the minimum operating voltage of described system is less than the charging overvoltage threshold and greater than the under-voltage threshold value of described discharge.
As of the present invention one preferred embodiment, wherein said first switch realization charging is controlled and discharge is controlled to be by controlling: when charging just often, described boosting-battery protection control circuit is controlled the first switch conduction charge circuit, when charging was unusual, described boosting-battery protection control circuit was controlled first switch and is turn-offed charge circuit; In discharge just often, described boosting-battery protection control circuit is controlled the first switch conduction discharge loop, and when the discharge generation was unusual, described boosting-battery protection control circuit was controlled first switch and turn-offed discharge loop.
As of the present invention one preferred embodiment, wherein said second switch comprises nmos pass transistor MN3, described first switch comprises a PMOS transistor MP1 and the 2nd PMOS transistor MP2 that is series at successively between described intermediate node and described first power end, wherein, the source electrode of a described PMOS transistor MP1 links to each other with intermediate node with lining body end, its drain electrode links to each other with the drain electrode of described the 2nd PMOS transistor MP2, the source electrode of described the 2nd PMOS transistor MP2 links to each other with first power supply node with lining body end, when the voltage of electric core node during more than or equal to the minimum operating voltage of system, control described nmos pass transistor MN3 by described boosting-battery protection control circuit and turn-off, control a PMOS transistor MP1 and the 2nd PMOS transistor MP2 conducting or/and turn-off; When the voltage of electric core node greater than the under-voltage threshold value of discharge and less than the minimum operating voltage of system and when the discharge overcurrent occurring, by described boosting-battery protection control circuit control nmos pass transistor MN3 and a PMOS transistor MP1, the 2nd PMOS transistor MP2 alternate conduction; When the voltage of electric core node greater than the under-voltage threshold value of discharge and less than the minimum operating voltage of system and when the discharge overcurrent occurring or the voltage of electric core node during less than the under-voltage threshold value of discharge, described boosting-battery protection control circuit is controlled a PMOS transistor MP1 and is turn-offed.
As of the present invention one preferred embodiment; wherein said boosting-battery protection control circuit comprises the power end V that links to each other with electric core node; the earth terminal G that links to each other with ground node; the intermediate node link LX that links to each other with intermediate node, the first power end link VM that links to each other with first power end, the second control end DO that the first control end CO that links to each other with the grid of the 2nd PMOS transistor MP2 links to each other with the grid with a PMOS transistor MP1.
Preferred embodiment wherein said resistance R 1 is connected between power end V and the electric core node as one of the present invention, and described capacitor C 1 is connected between power end V and the earth terminal G; Perhaps, described resistance R 1 is connected between ground node and the earth terminal G, and described capacitor C 1 is connected between power end V and the earth terminal G.
As of the present invention one preferred embodiment, wherein it also comprises capacitor C 2 and resistance R 4, described capacitor C 2 is connected between the described first power end link VM and the second source end, and described resistance R 4 is connected between the described first power end link VM and the first power end VP.
As of the present invention one preferred embodiment, wherein said boosting-battery protection control circuit comprises boost control circuit and battery protection control circuit, when the voltage of electric core node during greater than the minimum operating voltage of described system, MN3 turn-offs by described boost control circuit control nmos pass transistor, and by described battery protection control circuit control PMOS transistor MP1 and MP2 conducting or/and turn-off; When the voltage of electric core node greater than the under-voltage threshold value of discharge and less than the minimum operating voltage of system and when the discharge overcurrent occurring, by described boost control circuit control nmos pass transistor MN3 and PMOS transistor MP1, MP2 alternate conduction; When the voltage of electric core node greater than the under-voltage threshold value of discharge and less than the minimum operating voltage of system and when the discharge overcurrent occurring or the voltage of electric core node during less than the under-voltage threshold value of discharge, turn-offed by described battery protection control circuit control PMOS transistor MP1.
As of the present invention one preferred embodiment, wherein said boost control circuit is exported first boost drive signals and second boost drive signals according to the voltage of electric core node and first power end, and wherein second boost drive signals links to each other with the grid of described nmos pass transistor MN3; Described battery protection control circuit is exported charge protection control signal and discharge prevention control signal according to the voltage on electric core node, intermediate node and first power end: described boosting-battery protecting circuit also comprises logic selection circuit; described logic selects circuit to be used for selecting first boost drive signals or charge protection control signal to give the described first control end CO of described the 2nd PMOS transistor MP2, selects first boost drive signals or discharge prevention control signal to give the described second control end DO.
As of the present invention one preferred embodiment, wherein said logic selects circuit to comprise first or door OR1 and second or door OR2, first or the door OR1 first input end link to each other with described first boost drive signals, its second input links to each other with described charge protection control signal, and its output links to each other with the described first control end CO; Second or the door OR2 first input end link to each other with described first boost drive signals, its second input links to each other with described discharge prevention control signal, its output links to each other with the described second control end DO.
As of the present invention one preferred embodiment; wherein said boosting-battery protection control circuit also comprises power selection circuit; described power selection circuit is used for the voltage height of more electric core node and first power end, and selects the higher link of voltage and described logic to select the power end of circuit to link to each other.
Compared with prior art; the battery protecting circuit of the band booster circuit among the present invention; it not only can carry out charge protection and discharge prevention to electric core Bat; and when electric core Bat powers for the system that is powered, can increase electric core Bat available energy, thereby prolong operating time and the stand-by time of the system that is powered.
[description of drawings]
In order to be illustrated more clearly in the technical scheme of the embodiment of the invention, the accompanying drawing of required use is done to introduce simply in will describing embodiment below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.Wherein:
Fig. 1 is the circuit diagram of lithium battery when power supply in the prior art;
Fig. 2 is the battery protecting circuit schematic diagram in one embodiment of the band booster circuit among the present invention;
Fig. 3 is boosting-battery protection control circuit schematic diagram in one embodiment among Fig. 2;
Fig. 4 is the battery protecting circuit schematic diagram in another embodiment of the band booster circuit among the present invention;
Fig. 5 is the signal of battery protecting circuit in another embodiment of the band booster circuit among the present invention;
Fig. 6 is boosting-battery protection control circuit schematic diagram in one embodiment among Fig. 5.
[embodiment]
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
Alleged " embodiment " or " embodiment " refers to be contained in special characteristic, structure or the characteristic at least one implementation of the present invention herein.Different local in this manual " in one embodiment " that occur not are all to refer to same embodiment, neither be independent or the embodiment mutually exclusive with other embodiment optionally.Unless stated otherwise, the word that connection herein, the expression that links to each other, joins electrically connect is all represented directly or indirectly to be electrical connected.
The battery protecting circuit of the band booster circuit among the present invention not only has the function of electric core Bat being carried out charge protection and discharge prevention; and when electric core Bat powers for the system that is powered; when the voltage of electric core Bat less than the minimum operating voltage of system and greater than the under-voltage threshold value of discharge and when the discharge overcurrent occurring; the function that also has booster circuit; the voltage of electric core Bat is boosted; to continue powering for the system that is powered; thereby increase the available energy of electric core Bat, and then prolong operating time and the stand-by time of the system that is powered.
Please refer to shown in Figure 2ly, it is the battery protecting circuit schematic diagram in one embodiment of the band booster circuit among the present invention.The battery protecting circuit 210 of described band booster circuit comprises resistance R 1, capacitor C 1, inductance L 1, boosts-battery protection control circuit 212, first switch 214 and second switch (not shown among Fig. 1, it is 215 among Fig. 3).
Electricity core Bat is connected between electric core node A and the ground node B, inductance L 1 is connected between electric core node A and the intermediate node LX, first switch 214 is connected between intermediate node LX and the first power end VP, second switch is connected between intermediate node LX and the ground node B, capacitor C 1 and resistance R 1 are series between electric core node A and the ground node B, and second source end VG links to each other with ground node B, generally speaking, ground node B ground connection, the voltage of electric core node A equals the voltage of electric core Bat.
Electric core Bat among Fig. 2 provides voltage by the battery protecting circuit 210 of band booster circuit for described power management chip 220, and described power management chip 220 is exported to power supply circuits 230 after the voltage of input is changed.Please refer to shown in Figure 2; the first power end VP of the battery protecting circuit 210 of described band booster circuit links to each other with an input of power management chip 220; its second source end VG links to each other with another input of power management chip 220, the output of power management chip 220 be powered circuit 230 and link to each other.Described power management chip 220 comprises a plurality of DC/DC and a plurality of LDO, carries out voltage transitions with the voltage that the battery protecting circuit 210 of described band booster circuit is exported, thereby offers the described various system voltages that circuit 230 needs that are powered.
Described boosting-battery protection control circuit 212 is used for the on off state of first switch 214 and second switch is controlled.Concrete control procedure is as follows:
When the voltage (being the voltage of electric core Bat) of electric core node A during more than or equal to the minimum operating voltage of system, described boosting-battery protection control circuit 212 control second switches turn-off; And by control first switch, 214 realization charging controls and discharge control, be specially, when charging normal (charging current and charging voltage are all normal), described boosting-battery protection control circuit 212 controls first switch 214 conducting charge circuits, charging unusual (such as, charging overcurrent or charging overvoltage) time, described boosting-battery protection control circuit 212 controls first switch 214 turn-offs charge circuit; When discharge normal (discharging current and discharge voltage are all normal); described boosting-battery protection control circuit 212 controls first switch 214 conducting discharge loops; take place unusually in discharge (such as; the discharge overcurrent) time, described boosting-battery protection control circuit 212 controls first switch 214 turn-offs discharge loop.
When the voltage of electric core node A greater than the under-voltage threshold value of discharge and less than the minimum operating voltage of system and when the discharge overcurrent occurring, described boosting-battery protection control circuit 212 control first switch 214 and second switch alternate conduction.
When the voltage of electric core node A greater than the under-voltage threshold value of discharge and less than the minimum operating voltage of system and when the discharge overcurrent occurring or the voltage of electric core node A during less than the under-voltage threshold value of discharge, described boosting-battery protection control circuit 212 controls first switch 214 turn-offs discharge loops.Wherein, the minimum operating voltage of described system is less than the charging overvoltage threshold and greater than the under-voltage threshold value of described discharge.
Please continue with reference to shown in Figure 2, second switch 215 among Fig. 2 is nmos pass transistor MN3 (please refer to shown in Figure 3), first switch 214 comprises PMOS (P-channel Metal Oxide Semiconductor) field effect transistor M P1 and the MP2 that is series at successively between described intermediate node LX and the first power end VP, the drain electrode of the one PMOS transistor MP1 links to each other with the drain electrode of the 2nd PMOS transistor MP2, the source electrode of the one PMOS transistor MP1 links to each other with intermediate node LX with lining body end, the source electrode of the 2nd PMOS transistor MP2 links to each other with the first power end VP with lining body end, at a PMOS transistor MP1 endoparasitism diode (not shown) is arranged, at the 2nd PMOS transistor MP2 endoparasitism the diode (not shown) is arranged.Second switch among the embodiment shown in Figure 2 is nmos pass transistor MN3 (please refer to shown in Figure 3).
Boosting among Fig. 2-battery protection control circuit 212 comprises four links (or being called the test side) and two control ends.The first power end link VM that four links are respectively the power end V that links to each other with electric core node A, the earth terminal G that links to each other with ground node B, the intermediate node link LX that links to each other with intermediate node LX, link to each other with the first power end VP; Two control ends are respectively the second control end DO that the first control end CO that links to each other with the grid of the 2nd PMOS transistor MP2 links to each other with grid with a PMOS transistor MP1.In the embodiment shown in Figure 2, described resistance R 1 is connected between link V and the electric core node A, and described capacitor C 1 is connected between link V and the link G.In the embodiment shown in Figure 2; it also comprises capacitor C 2 and resistance R 4 battery protecting circuit 210 of described band booster circuit; described capacitor C 2 is connected between described link VM and the second source end VG, and described resistance R 4 is connected between link VM and the first power end VP.
Here need to prove that link V links to each other with electric core node A by resistance R 1, because the electric current on the resistance R 1 is very little, the pressure drop on its resistance R 1 can be ignored, and therefore, the voltage on the link V equals the voltage (being the voltage of electric core Bat) of electric core node A; In like manner, link VM links to each other with the first power end VP by resistance R 4, because the electric current on the resistance R 4 is very little, the pressure drop on its resistance R 4 can be ignored, and therefore, the voltage on the link VM equals the voltage on the described first power end VP.
Below specifically introduce the course of work of the battery protecting circuit 210 of band booster circuit shown in Figure 2.
As electric core node A during greater than the minimum operating voltage of described system (being the minimum voltage that power management chip 220 can operate as normal); described boosting-battery protection control circuit 212 is operated in battery protection control circuit pattern; be that described boosting-described nmos pass transistor MN3 of battery protection control circuit 212 controls turn-offs; and control PMOS transistor MP1 and MP2 conducting is or/and turn-off, with control and discharge control that electric core Bat is charged.At this moment; described resistance R 1, capacitor C 1, inductance L 1, resistance R 4, inductance C2, boost-battery protection control circuit 212, PMOS transistor MP1 and MP2 form battery protecting circuit; control with charged state and discharge condition to electric core Bat, namely the battery protecting circuit 210 with booster circuit is operated in the battery protecting circuit pattern.Its reason is, when the voltage of electric core Bat during greater than the minimum operating voltage of described system, it does not need to boost to handle and just can be powered circuit 230 by 220 pairs of power management chips and power.
When the voltage of electric core node A greater than the under-voltage threshold value of discharge and less than the minimum operating voltage of system and when the discharge overcurrent occurring; described boosting-battery protection control circuit 212 is in the boost control circuit pattern; be that described boosting-battery protection control circuit 212 control PMOS transistor MP1 and MP2 conducting and nmos pass transistor MN3 turn-off, perhaps PMOS transistor MP1 and MP2 turn-off and nmos pass transistor MN3 conducting (being nmos pass transistor MN3 and PMOS transistor MP1, MP2 alternate conduction).At this moment; by described resistance R 1; capacitor C 1; inductance L 1; resistance R 4; inductance C2; described boosting-battery protection control circuit 212; nmos pass transistor MN3; PMOS transistor MP1 and MP2 form booster circuit; namely the battery protecting circuit 210 with booster circuit is operated in the boost control circuit pattern; the voltage of electric core Bat is boosted by this booster circuit; and make the voltage (i.e. the voltage of the first power end VP) after boosting equal the minimum operating voltage of described system, be powered circuit 230 thereby make the voltage of battery protecting circuit 210 output of described band booster circuit can continue to offer by power management chip 220.Its reason is; when the voltage of electric core Bat greater than the under-voltage threshold value of discharge and less than the minimum operating voltage of system and when the discharge overcurrent occurring; if the battery protecting circuit 210 of described band booster circuit also is operated in the battery protecting circuit pattern; being powered circuit 230 can not work; the voltage of electric core Bat need be boosted by booster circuit, just can make to be powered circuit 230 and to work on.
When the voltage of electric core node A greater than the under-voltage threshold value of discharge and less than the minimum operating voltage of system and when the discharge overcurrent occurring or the voltage of electric core node A when the discharge overvoltage occurring less than the under-voltage threshold value of discharge; described boosting-battery protection control circuit 212 turn-offs PMOS transistor MP1 by control; to turn-off discharge loop, carry out discharge prevention.
In sum, the battery protecting circuit 210 of the band booster circuit among the present invention is when the voltage (being the voltage of electric core node A) of electric core Bat during greater than the minimum operating voltage of described system, described boosting-battery protection control circuit 212 is operated in battery protection control circuit pattern, by described resistance R 1, capacitor C 1, inductance L 1, resistance R 4, inductance C2, boost-battery protection control circuit 212, PMOS transistor MP1 and MP2 form battery protecting circuit; When the voltage of electric core Bat greater than the under-voltage threshold value of discharge and less than the minimum operating voltage of system and when the discharge overcurrent occurring; described boosting-battery protection control circuit 212 is in the boost control circuit pattern; by described resistance R 1; capacitor C 1; inductance L 1; resistance R 4; inductance C2; described boosting-battery protection control circuit 212; nmos pass transistor MN3; PMOS transistor MP1 and MP2 form booster circuit; continue to being powered circuit 230 power supplies the back so that electric core Bat voltage boosts; thereby increase electric core Bat available energy, prolong the operating time and the stand-by time that are powered circuit.And the booster circuit pattern of the battery protecting circuit 210 of described band booster circuit and battery protecting circuit mode common part peripheral components have reduced area occupied, have reduced cost.
Please refer to shown in Figure 3ly, it is boosting-battery protection control circuit schematic diagram in one embodiment among Fig. 2.Described boosting-battery protection control circuit comprises boost control circuit 310, battery protection control circuit 320 and logic selection circuit 330.
When the voltage (being the voltage of electric core Bat) of electric core node A during greater than the minimum operating voltage of described system, 310 control nmos pass transistor MN3 turn-off by described boost control circuit, and by described battery protection control circuit 320 control PMOS transistor MP1 and MP2 conducting or/and turn-off; When the voltage of electric core node A greater than the under-voltage threshold value of discharge and less than the minimum operating voltage of system and when the discharge overcurrent occurring, by described boost control circuit 310 control nmos pass transistor MN3 and PMOS transistor MP1, MP2 alternate conduction; When the voltage of electric core node A greater than the under-voltage threshold value of discharge and less than the minimum operating voltage of system and when the discharge overcurrent occurring or the voltage of electric core node A during less than the under-voltage threshold value of discharge; turn-offed by described battery protection control circuit 320 control PMOS transistor MP1, to turn-off discharge loop.
Described boost control circuit 310 is exported first boost drive signals and second boost drive signals according to the voltage of electric core node A and the voltage of the first power end VP.Driven conducting or the shutoff of signal controlling nmos pass transistor MN3 by second of described boost control circuit 310 outputs.In embodiment as shown in Figure 3; the V end of described boost control circuit 310 links to each other with the power end V of described boosting-battery protecting circuit 212; its VM end links to each other with the first power end VP link VM; its G end links to each other with earth terminal G; its LX end links to each other with intermediate node link LX; its first output PD exports the first boost drive signals PD, and its second output ND exports the second boost drive signals ND, and the described second output ND links to each other with the grid of described nmos pass transistor MN3.
Described battery protection control circuit 320 is according to the voltage of electric core node A, the voltage of intermediate node LX and voltage output charge protection control signal and the discharge prevention control signal of the first power end VP.In embodiment as shown in Figure 3; the V end of described battery protection control circuit 320 links to each other with the power end V of described boosting-battery protection control circuit 212; its VM end links to each other with the first power end VP link VM; its G end links to each other with earth terminal G; its LX end links to each other with intermediate node link LX; its first output COI output charge protection control signal COI, its second output DOI output discharge prevention control signal DOI.
Described logic selects circuit 330 to be used for the grid (namely giving the first control end CO of described boosting-battery protection control circuit 212) of selecting the described first boost drive signals PD or charge protection control signal COI to give described the 2nd PMOS transistor MP2, selects the described first boost drive signals PD or discharge prevention control signal DOI to give the grid (namely giving the first control end DO of described boosting-battery protection control circuit 212) of a described PMOS transistor MP1.In embodiment as shown in Figure 3; described logic selects circuit 330 to comprise first or door OR1 and second or door OR2; first or the door OR1 first input end link to each other with the first output PD of described boost control circuit 310; its second input links to each other with the first output COI of described battery protection control circuit 320, and its output (i.e. the first control end CO) links to each other (as shown in Figure 2) with the grid of PMOS transistor MP2.Second or the door OR2 first input end link to each other with the first output PD of described boost control circuit 310; its second input links to each other with the second output DOI of described battery protection control circuit 320, and its output (i.e. the second control end DO) links to each other (as shown in Figure 2) with the grid of a PMOS transistor MP1.When the first boost drive signals PD and charge protection control signal COI are low level, the first control end CO output low level; When one of them was high level as the first boost drive signals PD and charge protection control signal COI, the first control end CO exported high level.When the first boost drive signals PD and discharge prevention control signal DOI are low level, the second control end DO output low level; When one of them was high level as the first boost drive signals PD and discharge prevention control signal DOI, the second output DO exported high level.
Below specifically introduce the course of work of shown in Figure 3 boosting-battery protection control circuit.
When the voltage (being the voltage of power end V) of electric core node A greater than the minimum operating voltage of system (such as, 3.4V) time, the first boost drive signals PD and the second boost drive signals ND of described boost control circuit 310 outputs are low level (first logic level), and this second boost drive signals ND makes nmos pass transistor MN3 be in off state always; At this moment, the first control end CO selects output charge protection control signal COI, and the second control end DO selects output discharge prevention control signal DOI, with control PMOS transistor MP1 and MP2 conducting or/and turn-off.Be specially, when charging normal (charging current and charging voltage are all normal), charge protection control signal COI and the discharge prevention control signal DOI of described battery protection control circuit 320 outputs are low level (first logic level), control PMOS transistor MP1, MP2 conducting simultaneously are with the conducting charge circuit; When discharging normal (discharging current and discharge voltage are all normal), charge protection control signal COI and the discharge prevention control signal DOI of described battery protection control circuit 320 outputs also are low level (first logic level), control PMOS transistor MP1, MP2 conducting simultaneously are with the conducting discharge loop; Unusual when charging (such as, charging overcurrent or charging overvoltage) time, the charge protection control signal COI of described battery protection control circuit 320 outputs is high level (second logic level), discharge prevention control signal DOI is low level (first logic level), control PMOS transistor MP1 conducting and PMOS transistor MP2 turn-off, to turn-off charge circuit; Unusual when discharging (such as; the discharge overcurrent) time; the charge protection control signal COI of described battery protection control circuit 320 outputs is low level (first logic level); discharge prevention control signal DOI is high level (second logic level); control PMOS transistor MP1 turn-offs and PMOS transistor MP2 conducting, to turn-off discharge loop.When normal condition, described battery protection control circuit 320 control PMOS transistor MP1, MP2 conducting simultaneously, this moment is both chargeable also can discharge.When unusual (such as charging overcurrent and charging overvoltage) takes place in charging; described battery protection control circuit 320 control PMOS transistor MP2 end; thereby cut off charge circuit, but still can be by the discharge of the parasitic diode among PMOS transistor MP1 and the PMOS transistor MP2.When unusual (such as the discharge overcurrent) took place in discharge, described battery protection control circuit 320 control PMOS transistor MP1 ended, thereby have cut off discharge loop, but still can be by the charging of the parasitic diode among PMOS transistor MP2 and the PMOS transistor MP1.
When the voltage (being the voltage of power end V) of electric core node A greater than discharge under-voltage threshold value (such as 2.3V) and less than the minimum operating voltage of system (such as 3.4V) and when the discharge overcurrent occurring or the voltage of electric core node A when the discharge overvoltage occurring less than the under-voltage threshold value of discharge (such as 2.3V); the charge protection control signal COI of described battery protection control circuit 320 outputs is low level (first logic level); discharge prevention control signal DOI is high level (second logic level); at this moment; it is high level that the second control end DO selects the output second protection control signal DOI(); turn-offing described PMOS transistor MP1, thereby cut off discharge loop.
In the above-mentioned example, first logic level is low level, second logic level is high level, in other embodiments, first logic level can be high level, and second logic level can be low level, at this moment, increase inverter between the grid with the described second output ND and described nmos pass transistor MN3, and the described logic of corresponding change selects the logic of circuit 330 to get final product.
In summary; battery protection control circuit 320 detects the charging and discharging state of electric core Bat always; when discharging and recharging of electric core Bat taken place when unusual; in time turn-off charge circuit or discharge loop; when the voltage of electric core Bat greater than the under-voltage threshold value of discharge and less than the minimum operating voltage of system and when the discharge overcurrent occurring, by described boost control circuit 310 control nmos pass transistor MN3 and PMOS transistor MP1, MP2 alternate conduction.
In one embodiment; shown in Figure 3 boosting-battery protection control circuit also comprises the power selection circuit (not shown); the voltage (i.e. the voltage of the first power end VP) that described power selection circuit is used for the voltage (being the voltage of electric core node A) of link V relatively and the first power end link VM just, and the higher link of selection voltage with or the power end of logical circuit OR1 and OR2 link to each other.So just can realize, when electric core node A(is the voltage of electric core Bat) greater than the under-voltage threshold value of discharge and during less than the minimum operating voltage of system, logic select circuit 330(such as, first or door OR1 and second or door OR2) can work on.
Please refer to shown in Figure 4ly, it is the battery protecting circuit schematic diagram in another embodiment of the band booster circuit among the present invention.The difference of itself and Fig. 2 is that described resistance R 1 is connected between the earth terminal G of ground node B and described boosting-battery protection control circuit 212, and described capacitor C 1 is connected between power end V and the earth terminal G.Like this, can realize good power filter effect equally, identical with the filter effect of Fig. 2.
Please refer to shown in Figure 5ly, it is the battery protecting circuit schematic diagram in another embodiment of the band booster circuit among the present invention.The difference of itself and Fig. 2 is: first switch 514 among Fig. 5 is PMOS transistor MP3, and described PMOS transistor MP3 comprises first link that links to each other with intermediate node LX, second link that links to each other with the first power end VP and serves as a contrast the body end; Two control ends that boosting among Fig. 5-battery protection control circuit 512 comprises; be respectively switch control end CDO and be connected control end BO with the lining body; described switch control end CDO links to each other with the grid of described PMOS transistor MP3, and described lining body connects control end BO and links to each other with the lining body end of described PMOS transistor MP3.
In the embodiment shown in fig. 5, only control the conducting of charge circuit or conducting or the shutoff of shutoff and control discharge loop by PMOS transistor MP3 as switch, for fear of the influence of its entozoic this control procedure of diode pair, need be in charging process and the corresponding direction that changes its parasitic diode of discharge process.When electric core Bat is in charging process, be that the voltage of intermediate node LX is during less than the voltage of the first power end VP, the lining body end of PMOS transistor MP3 is linked to each other with the first power end VP, at this moment, the direction of the parasitic diode in the PMOS transistor MP3 is pointed to the first power end VP from intermediate node LX, and (anode connects intermediate node, negative electrode connects the first power end VP), namely when electric core Bat is in charging process, in the parasitic diode in the PMOS transistor MP3 always no current pass through.When electric core Bat is in discharge process, be that the voltage of intermediate node LX is during greater than the voltage of the first power end VP, the lining body end of PMOS transistor MP3 is linked to each other with intermediate node LX, at this moment, the direction of the parasitic diode in the PMOS transistor MP3 is pointed to intermediate node LX from the first power end VP, and (negative electrode connects intermediate node, anode connects the first power end VP), namely when electric core Bat is in discharge process, in the parasitic diode in the PMOS transistor MP3 always no current pass through.
Below specifically introduce the course of work of the battery protecting circuit of band booster circuit shown in Figure 5.
When the voltage of intermediate node LX during less than the voltage (being that electric core Bat is in charged state) of the first power end VP, the lining body end of described boosting-battery protection control circuit 512 controls the 3rd PMOS transistor MP3 links to each other with the first power end VP; When the voltage of intermediate node LX during greater than the voltage (being that electric core Bat is in discharge condition) of the first power end VP, the lining body end of described boosting-battery protection control circuit 512 controls the 3rd PMOS transistor MP3 links to each other with intermediate node LX;
When the voltage of electric core node A during more than or equal to the minimum operating voltage of system, described boosting-battery protection control circuit 512 is operated in battery protection control circuit pattern, turn-offed by described boosting-described nmos pass transistor MN3 of battery protection control circuit 512 controls, control the 3rd PMOS transistor MP3 conducting or shutoff with control and discharge control that electric core Bat is charged;
When the voltage of electric core node A greater than the under-voltage threshold value of discharge and less than the minimum operating voltage of system and when the discharge overcurrent occurring, described boosting-battery protection control circuit 512 is in the boost control circuit pattern, by described boosting-battery protection control circuit 512 control nmos pass transistor MN3, the 3rd PMOS transistor MP3 alternate conduction, the voltage of electric core Bat is boosted by this booster circuit, and make the voltage (i.e. the voltage of the first power end VP) after boosting equal the minimum operating voltage of described system, be powered circuit 230 thereby make the voltage of battery protecting circuit 210 output of described band booster circuit can continue to offer by power management chip 220;
When the voltage of electric core node A greater than the under-voltage threshold value of discharge and less than the minimum operating voltage of system and when the discharge overcurrent occurring or the voltage of electric core node A during less than the under-voltage threshold value of discharge; described boosting-battery protection control circuit 512 controls the 3rd PMOS transistor MP3 turn-offs; to turn-off discharge loop, carry out discharge prevention.
Please refer to shown in Figure 6ly, it is boosting-battery protection control circuit schematic diagram in one embodiment among Fig. 5.
Boosting among Fig. 6-battery protection control circuit comprises boost control circuit 610, battery protection control circuit 620, logic selection circuit 630 and lining body selection circuit 640.
Described lining body selection circuit 640 is used for comparing the voltage height of intermediate node LX and the first power end VP, and it is continuous to select the higher link of voltage to be connected control end BO with described lining body.
When the voltage of electric core node A during greater than the minimum operating voltage of described system, turn-offed by described boost control circuit 610 control nmos pass transistor MN3, and by described battery protection control circuit 620 controls the 3rd MP3 conducting of PMOS transistor or shutoff; When the voltage of electric core node A greater than the under-voltage threshold value of discharge and less than the minimum operating voltage of system and when the discharge overcurrent occurring, by described boost control circuit 610 control nmos pass transistor MN3 and the 3rd PMOS transistor MP3 alternate conduction; When the voltage of electric core node A greater than the under-voltage threshold value of discharge and less than the minimum operating voltage of system and when the discharge overcurrent occurring or the voltage of electric core node A when the discharge overvoltage occurring less than the under-voltage threshold value of discharge; turn-offed by described battery protection control circuit 620 controls the 3rd PMOS transistor MP3, to turn-off discharge loop.
Boost control circuit 610 among Fig. 6 and battery protection control circuit 620 are identical with battery protection control circuit 320 with boost control circuit 310 among Fig. 3, are not giving unnecessary details at this.
Described logic selects circuit 630 to be used for selecting the described first boost drive signals PD, charge protection control signal COI or discharge prevention control signal DOI to give the grid of described switch control end CDO(or described PMOS transistor MP3).In embodiment as shown in Figure 6; described logic selects circuit 630 to comprise the 3rd or door OR3; the described the 3rd or the door OR3 first input end link to each other with the first output PD of described boost control circuit 610; its second input links to each other with the first output COI of described battery protection control circuit 620; its the 3rd input links to each other with the second output DOI of described battery protection control circuit 620, and its output (being switch control end CDO) links to each other (as shown in Figure 5) with the grid of PMOS transistor MP3.When the first boost drive signals PD and charge protection control signal COI and discharge prevention control signal DOI are low level, switch control end CDO output low level; When one of them was high level as the first boost drive signals PD and charge protection control signal COI and discharge prevention control signal DOI, switch control end CDO exported high level.
In the embodiment shown in fig. 6, described lining body selects circuit 640 to comprise that comparator C OMP1, first connects switch SW 1, second and connects switch SW 2 and inverter inv1.Described first connects the grid that switch SW 1 is connected in electric core node A and lining body connection control end BO(or the transistorized MP3 of described PMOS) between; Second connects switch SW 2 is connected between electric core node A and the lining body connection control end BO; The normal phase input end of comparator C OMP1 links to each other with electric core node A, its negative-phase input links to each other with the first power end VP, its output is connected switch SW 1 with first control end links to each other, and its output links to each other by inverter INV1 is connected switch SW 2 with second control end.
Below specifically introduce the course of work of shown in Figure 6 boosting-battery protection control circuit.
When the voltage of intermediate node LX during less than the voltage (being that electric core Bat is in charged state) of the first power end VP, described lining body selects circuit 640 to select the first power end VP continuous with the lining body end (perhaps serve as a contrast body and be connected control end BO) of the 3rd PMOS transistor MP3; When the voltage of intermediate node LX during greater than the voltage (being that electric core Bat is in discharge condition) of the first power end VP, described lining body selects circuit 640 to select intermediate node LX to link to each other with the lining body end of the 3rd PMOS transistor MP3.
When the voltage (being the voltage of electric core Bat) of electric core node A greater than the minimum operating voltage of system (such as, 3.4V) time, the first boost drive signals PD and the second boost drive signals ND of described boost control circuit 610 outputs are low level (first logic level), and this second boost drive signals ND makes nmos pass transistor MN3 be in off state always; At this moment, switch control end CDO selects output charge protection control signal COI or discharge prevention control signal DOI, with control pmos fet MP3 conducting or shutoff.Be specially, when charging normal (charging current and charging voltage are all normal), charge protection control signal COI and the discharge prevention control signal DOI of described battery protection control circuit 620 outputs are low level (first logic level), switch control end CDO holds output low level, control PMOS transistor MP3 conducting is with the conducting charge circuit; When discharging normal (discharging current and discharge voltage are all normal), charge protection control signal COI and the discharge prevention control signal DOI of described battery protection control circuit 620 outputs also are low level (first logic level), switch control end CDO holds output low level, control PMOS transistor MP3 conducting is with the conducting discharge loop; Unusual when charging (such as, charging overcurrent or charging overvoltage) time, the charge protection control signal COI of described battery protection control circuit 620 outputs is high level (second logic level), discharge prevention control signal DOI is low level (first logic level), switch control end CDO selects output charge protection control signal COI(high level), control PMOS transistor MP3 turn-offs, to turn-off charge circuit; Unusual when discharging (such as; the discharge overcurrent) time; the charge protection control signal COI of described battery protection control circuit 620 outputs is low level (first logic level); discharge prevention control signal DOI is high level (second logic level); switch control end CDO end is selected output discharge prevention control signal DOI(high level); control PMOS transistor MP3 turn-offs, to turn-off discharge loop.
In one embodiment, to select the power end of circuit 630 to be connected control end BO with described lining body continuous for the logic among Fig. 6.So just can realize, when electric core node A(is the voltage of electric core Bat) greater than the under-voltage threshold value of discharge and during less than the minimum operating voltage of system, logic select circuit 630(such as, first or door OR1 and second or door OR2) can work on.
Need to prove, boost control circuit among described Fig. 3 and Fig. 6 can adopt the various modulation technique of boosting of the prior art, such as, can adopt pulse width modulating technology, also can adopt the pulse frequency modulated technology, voltage by link VM is that feedback voltage is controlled, and the voltage modulated of VM is equaled the minimum operating voltage of system.
Battery protection control circuit among described Fig. 3 and Fig. 6 also can adopt various battery protection technology of the prior art, generally comprises the charging overvoltage protection function, discharge under-voltage protection function and discharge overcurrent protection function.
What those skilled in the art expected easily is that the minimum operating voltage of the system that above mentions also can replace with other voltage threshold, as long as this voltage threshold is greater than the minimum operating voltage of system and less than the charging overvoltage threshold.
In sum; the battery protecting circuit of the band booster circuit among the present invention not only has the battery protecting circuit pattern; and when electric core Bat powers for the system that is powered; when the voltage of electric core Bat less than the minimum operating voltage of system and greater than the under-voltage threshold value of discharge and when the discharge overcurrent occurring; also has the booster circuit pattern; the voltage of electric core Bat is boosted; to continue powering for the system that is powered; thereby increase electric core Bat available energy, and then can prolong operating time and the stand-by time of the system of being powered.And the booster circuit pattern of the battery protecting circuit of described band booster circuit and battery protecting circuit mode common part peripheral components have reduced cost.
In the present invention, " connection ", link to each other, word that expressions such as " company ", " connecing " are electrical connected, if no special instructions, then represent direct or indirect electric connection.
It is pointed out that and be familiar with the scope that any change that the person skilled in art does the specific embodiment of the present invention does not all break away from claims of the present invention.Correspondingly, the scope of claim of the present invention also is not limited only to previous embodiment.
Claims (10)
1. a battery protecting circuit that has booster circuit is characterized in that, it comprises electric core, inductance L 1, capacitor C 1, resistance R 1, first switch, second switch and boost-the battery protection control circuit,
The electricity core is connected between electric core node and the ground node, inductance L 1 is connected between electric core node and the intermediate node, first switch is connected between intermediate node and first power end, second switch is connected between intermediate node and the ground node, capacitor C 1 and resistance R 1 are series between electric core node and the ground node, the second source end links to each other with ground node
Described boosting-battery protection control circuit is used for the on off state of first switch and second switch is controlled, when the voltage of electric core node during more than or equal to the minimum operating voltage of system, described boosting-battery protection control circuit control second switch turn-offs, and realizes charging control and discharge control by control first switch; When the voltage of electric core node greater than the under-voltage threshold value of discharge and less than the minimum operating voltage of system and when the discharge overcurrent occurring, described boosting-battery protection control circuit is controlled first switch and second switch alternate conduction; When the voltage of electric core node greater than the under-voltage threshold value of discharge and less than the minimum operating voltage of system and when the discharge overcurrent occurring or the voltage of electric core node during less than the under-voltage threshold value of discharge, described boosting-battery protection control circuit is controlled first switch and is turn-offed discharge loop,
Wherein, the minimum operating voltage of described system is less than the charging overvoltage threshold and greater than the under-voltage threshold value of described discharge.
2. battery protecting circuit according to claim 1 is characterized in that, described first switch realization charging is controlled and discharge is controlled to be by controlling:
When charging just often, described boosting-battery protection control circuit is controlled the first switch conduction charge circuit, and when charging was unusual, described boosting-battery protection control circuit was controlled first switch and turn-offed charge circuit; In discharge just often, described boosting-battery protection control circuit is controlled the first switch conduction discharge loop, and when the discharge generation was unusual, described boosting-battery protection control circuit was controlled first switch and turn-offed discharge loop.
3. battery protecting circuit according to claim 1; it is characterized in that; described second switch comprises nmos pass transistor MN3, and described first switch comprises a PMOS transistor MP1 and the 2nd PMOS transistor MP2 that is series at successively between described intermediate node and described first power end
Wherein, the source electrode of a described PMOS transistor MP1 links to each other with intermediate node with lining body end, and its drain electrode links to each other with the drain electrode of described the 2nd PMOS transistor MP2, and the source electrode of described the 2nd PMOS transistor MP2 links to each other with first power supply node with lining body end,
When the voltage of electric core node during more than or equal to the minimum operating voltage of system, control described nmos pass transistor MN3 by described boosting-battery protection control circuit and turn-off, control a PMOS transistor MP1 and the 2nd PMOS transistor MP2 conducting or/and turn-off;
When the voltage of electric core node greater than the under-voltage threshold value of discharge and less than the minimum operating voltage of system and when the discharge overcurrent occurring, by described boosting-battery protection control circuit control nmos pass transistor MN3 and a PMOS transistor MP1, the 2nd PMOS transistor MP2 alternate conduction;
When the voltage of electric core node greater than the under-voltage threshold value of discharge and less than the minimum operating voltage of system and when the discharge overcurrent occurring or the voltage of electric core node during less than the under-voltage threshold value of discharge, described boosting-battery protection control circuit is controlled a PMOS transistor MP1 and is turn-offed.
4. require 3 described battery protecting circuits according to power; it is characterized in that; described boosting-battery protection control circuit comprises the power end V that links to each other with electric core node; the earth terminal G that links to each other with ground node; the intermediate node link LX that links to each other with intermediate node, the first power end link VM that links to each other with first power end, the second control end DO that the first control end CO that links to each other with the grid of the 2nd PMOS transistor MP2 links to each other with the grid with a PMOS transistor MP1.
5. battery protecting circuit according to claim 4 is characterized in that, described resistance R 1 is connected between power end V and the electric core node, and described capacitor C 1 is connected between power end V and the earth terminal G; Perhaps, described resistance R 1 is connected between ground node and the earth terminal G, and described capacitor C 1 is connected between power end V and the earth terminal G.
6. battery protecting circuit according to claim 5; it is characterized in that; it also comprises capacitor C 2 and resistance R 4; described capacitor C 2 is connected between the described first power end link VM and the second source end, and described resistance R 4 is connected between the described first power end link VM and the first power end VP.
7. battery protecting circuit according to claim 4 is characterized in that, described boosting-battery protection control circuit comprises boost control circuit and battery protection control circuit,
When the voltage of electric core node during greater than the minimum operating voltage of described system, turn-offed by described boost control circuit control nmos pass transistor MN3, and by described battery protection control circuit control PMOS transistor MP1 and MP2 conducting or/and turn-off; When the voltage of electric core node greater than the under-voltage threshold value of discharge and less than the minimum operating voltage of system and when the discharge overcurrent occurring, by described boost control circuit control nmos pass transistor MN3 and PMOS transistor MP1, MP2 alternate conduction; When the voltage of electric core node greater than the under-voltage threshold value of discharge and less than the minimum operating voltage of system and when the discharge overcurrent occurring or the voltage of electric core node during less than the under-voltage threshold value of discharge, turn-offed by described battery protection control circuit control PMOS transistor MP1.
8. battery protecting circuit according to claim 7 is characterized in that,
Described boost control circuit is exported first boost drive signals and second boost drive signals according to the voltage of electric core node and first power end, and wherein second boost drive signals links to each other with the grid of described nmos pass transistor MN3;
Described battery protection control circuit is exported charge protection control signal and discharge prevention control signal according to the voltage on electric core node, intermediate node and first power end:
Described boosting-battery protecting circuit also comprises logic selection circuit; described logic selects circuit to be used for selecting first boost drive signals or charge protection control signal to give the described first control end CO of described the 2nd PMOS transistor MP2, selects first boost drive signals or discharge prevention control signal to give the described second control end DO.
9. battery protecting circuit according to claim 8 is characterized in that, described logic selects circuit to comprise first or door OR1 and second or door OR2,
First or the door OR1 first input end link to each other with described first boost drive signals, its second input links to each other with described charge protection control signal, its output links to each other with the described first control end CO;
Second or the door OR2 first input end link to each other with described first boost drive signals, its second input links to each other with described discharge prevention control signal, its output links to each other with the described second control end DO.
10. battery protecting circuit according to claim 9; it is characterized in that; described boosting-battery protection control circuit also comprises power selection circuit; described power selection circuit is used for the voltage height of more electric core node and first power end, and selects the higher link of voltage and described logic to select the power end of circuit to link to each other.
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| CN109240476B (en) * | 2018-09-18 | 2024-04-19 | 合肥联宝信息技术有限公司 | Battery power supply method, circuit and electronic equipment |
| CN114337280A (en) * | 2021-12-24 | 2022-04-12 | 苏州浪潮智能科技有限公司 | Boost circuit and flash chip power supply system |
| CN114337280B (en) * | 2021-12-24 | 2023-08-04 | 苏州浪潮智能科技有限公司 | Boost circuit and flash chip power supply system |
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| Publication number | Publication date |
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| CN103199504B (en) | 2015-09-09 |
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Address after: A 530 Taihu international science and Technology Park building 214028 Qingyuan Road in Jiangsu province Wuxi City District 10 layer Patentee after: WUXI ZHONGGAN MICROELECTRONIC CO., LTD. Address before: A 530 Taihu international science and Technology Park building 214028 Qingyuan Road in Jiangsu province Wuxi City District 10 layer Patentee before: Wuxi Vimicro Co., Ltd. |
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Effective date of registration: 20170511 Address after: Spark Road 210061 Jiangsu province Nanjing city high tech Development Zone No. 17 Powerise Building 1 building B block 16 layer Patentee after: Nanjing Sino Microelectronics Co., Ltd. Address before: A 530 Taihu international science and Technology Park building 214028 Qingyuan Road in Jiangsu province Wuxi City District 10 layer Patentee before: WUXI ZHONGGAN MICROELECTRONIC CO., LTD. |