CN102832814A - Method for controlling hysteresis with voltage feedforward quickly - Google Patents
Method for controlling hysteresis with voltage feedforward quickly Download PDFInfo
- Publication number
- CN102832814A CN102832814A CN2012103305233A CN201210330523A CN102832814A CN 102832814 A CN102832814 A CN 102832814A CN 2012103305233 A CN2012103305233 A CN 2012103305233A CN 201210330523 A CN201210330523 A CN 201210330523A CN 102832814 A CN102832814 A CN 102832814A
- Authority
- CN
- China
- Prior art keywords
- voltage
- input
- output
- control method
- switching tube
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Abstract
The invention relates to a method for controlling hysteresis with voltage feedforward quickly. A feedback circuit for traditional PWM voltage control is replaced by a hysteresis comparator and a feedback bypass, an input voltage is connected with a charging capacitor through a feedforward adjustment resistor, and the input voltage is also connected with a reference voltage through an upper and lower limit threshold adjustment resistor. An output voltage is connected with the charging capacitor through the feedforward adjustment resistor. The change of the input voltage and the output voltage lead to the change of the voltage on two ends of the charging capacitor. According to the method, no operational amplifier and triangular carrier circuit are used, the precise control of the output voltage is realized, only one hysteresis comparator is used so that the number of control components is reduced greatly, no error amplifier is used, no feedback phase delay is caused, the output voltage can be controlled at the minimum limit when the load and the input voltage change so that the original output voltage level can be restored quickly, and the requirements for high-speed transient response, small size, low cost and high-efficiency are met when the input voltage and the output load change.
Description
Technical field
The present invention relates to a kind of Switching Power Supply control technology, particularly a kind of quick hysteresis control method thereof that has electric voltage feed forward.
Background technology
Along with semiconductor and fast development of information technology, be that Switching Power Supply must satisfy following technical need as the DC-to-dc chopper of their power-supply management systems: (1) output voltage is low; (2) the output voltage precision is high; (3) output current is big; When (4) importing power supply and output loading transition, the transient overshoot of output voltage is little.Above demand has proposed higher requirement to the stable state and the dynamic characteristic of Switching Power Supply, and the control method of Switching Power Supply has been proposed new challenge.Wherein, traditional PWM voltage control method is because it satisfies the basic demand of stability and control precision, and is widely used in the Switching Power Supply.But; This control method only relates to when output variable change causes that load voltage changes to be controlled, when input voltage and load are undergone mutation, and the disturbance achieve effective control that causes when input variable not being changed; The time-delay that the compensating circuit of voltage error amplifier brings in the control circuit in addition lags behind; Not only cause its transient response slow, reduced its dynamic characteristic, and used operational amplifier and triangular carrier to produce circuit and other compensating circuit in the control circuit; These are prone to cause the manufacturing cost of Switching Power Supply to rise, and are difficult to realize miniaturization and lightweight.And the compensating circuit of voltage error amplifier is comparatively complicated when design and debugging.More than these problems brought a lot of difficulties to the designer, and prolonged the design cycle, consumed a large amount of manpower and materials.
Summary of the invention
The present invention be directed to traditional PWM voltage control method and be difficult to satisfy the response of input and output High-speed transient, miniaturization, lightweight, low cost, high efficiency problem; A kind of quick hysteresis control method thereof that has electric voltage feed forward has been proposed; Proposed when the input and output quantitative change is moving; Novel stagnant ring control mode with fast transient response characteristic has effectively improved the dynamic characteristic of control circuit, has good stable state and dynamic characteristic.
Technical scheme of the present invention is: a kind of quick hysteresis control method thereof that has electric voltage feed forward; Keeping on the basis of former PWM voltage switch partial circuit, changing original PWM voltage control circuit feedback fraction and be: output voltage is through the feedback adjustment resistance and the charging capacitor ground connection of series connection; Input voltage connects feedforward adjustment resistance and charging capacitor ground connection through the output of input MOS switching tube; Input voltage is through input MOS switching tube, connects ground connection behind two bound threshold values size adjustment resistance and the reference voltage of series connection; Charging capacitor voltage termination hysteresis comparator inverting input, two bound threshold values size adjustment resistance intermediate points connect the hysteresis comparator in-phase input end, and hysteresis comparator exports into that overdrive circuit connects input MOS switching tube grid; Obtain output voltage
, D wherein
oBe duty ratio D
o=
, K
cBe feedback oscillator K
c=
,
V L Be hysteresis comparator high level threshold voltage,
V OL ,
V OH Be respectively hysteresis comparator output low level, high level voltage, r is a decompression DC transducer equivalent internal resistance, and Ro is load, and R is feedforward adjustment resistance; Rf is a feedback adjustment resistance.
But said input MOS switching tube outputs to the centre additional proportion or the proportional integral link of feedforward adjustment resistance.
But the centre additional proportion or the proportional integral link of two bound threshold values size adjustment resistance of said input MOS switching tube output.
Said input voltage is through the output of input MOS switching tube, and in the ground connection, the output of input MOS switching tube can be exported from MOS switching tube grid or source electrode behind two the bound threshold values size adjustment resistance that connects series connection and the reference voltage.
Beneficial effect of the present invention is: the present invention has the quick hysteresis control method thereof of electric voltage feed forward, need not operational amplifier and triangular carrier circuit, has realized the accurate control of output voltage; Only need a hysteresis comparator, the control circuit device significantly reduces, and the control circuit topology is simple; Do not have the use error amplifier, do not have feedback phase to postpone, do not need phase compensating circuit fully.Simultaneously, the stability of control circuit is greatly improved; Output voltage all can be controlled in Min. down to the fast former output voltage level of quick-recovery of ability when load change and input voltage change, and output voltage overshoot and adjusting time are all minimum, and then have good adjusting and High-speed transient response characteristic; Compare with traditional PWM voltage control method, satisfied High-speed transient response, small-sized, low-cost, high efficiency requirement when input voltage and output loading variation.
Description of drawings
Fig. 1 is traditional PWM voltage control method circuit diagram;
Fig. 2 has novel hysteresis control method thereof embodiment one circuit diagram of electric voltage feed forward for the present invention;
Fig. 3 has novel hysteresis control method thereof embodiment two circuit diagrams of electric voltage feed forward for the present invention;
Fig. 4 has the novel hysteresis control method thereof embodiment one of electric voltage feed forward and two schematic diagram of movements for the present invention;
Fig. 5 makes up a circuit diagram for the novel hysteresis control method thereof embodiment that the present invention has electric voltage feed forward;
Fig. 6 makes up two circuit diagrams for the novel hysteresis control method thereof embodiment that the present invention has electric voltage feed forward;
Fig. 7 makes up four circuit diagrams for the novel hysteresis control method thereof embodiment that the present invention has electric voltage feed forward;
Fig. 8 makes up six circuit diagrams for the novel hysteresis control method thereof embodiment that the present invention has electric voltage feed forward;
Fig. 9 makes up seven circuit diagrams for the novel hysteresis control method thereof embodiment that the present invention has electric voltage feed forward;
Figure 10 makes up eight circuit diagrams for the novel hysteresis control method thereof embodiment that the present invention has electric voltage feed forward;
Figure 11 makes up nine circuit diagrams for the novel hysteresis control method thereof embodiment that the present invention has electric voltage feed forward;
Figure 12 makes up seven circuit output response curve for the novel hysteresis control method thereof embodiment that the present invention has electric voltage feed forward;
Figure 13 makes up nine circuit output response curve for the novel hysteresis control method thereof embodiment that the present invention has electric voltage feed forward;
Conventional P WM voltage control transient response curve figure when Figure 14 falls one times for load current Io jumps;
The new type of control method embodiment one transient state response curve that Figure 15 jumps and has electric voltage feed forward when falling one times for load current Io of the present invention;
The new type of control method embodiment two transient response curve figure that Figure 16 jumps and has electric voltage feed forward when falling one times for load current Io of the present invention;
Conventional P WM voltage control transient response curve figure when Figure 17 rises to one times for load current Io;
Figure 18 has the new type of control method embodiment one transient state response curve of electric voltage feed forward when rising to one times for load current Io of the present invention;
Figure 19 has the new type of control method embodiment two transient response curve figure of electric voltage feed forward when rising to one times for load current Io of the present invention;
40% o'clock conventional P WM voltage control transient response curve figure falls in Figure 20 for input voltage jumps;
The new type of control method embodiment one transient state response curve that had electric voltage feed forward at 40% o'clock falls in Figure 21 for input voltage of the present invention jumps;
The new type of control method embodiment two transient response curve figure that had electric voltage feed forward at 40% o'clock fall in Figure 22 for input voltage of the present invention jumps;
Figure 23 rises to 40% o'clock conventional P WM voltage control transient response curve figure for input voltage;
The new type of control method embodiment one transient state response curve that Figure 24 had electric voltage feed forward at 40% o'clock for input voltage of the present invention rises to;
The new type of control method embodiment two transient response curve figure that Figure 25 had electric voltage feed forward at 40% o'clock for input voltage of the present invention rises to.
Embodiment
To the shortcoming of traditional control method, we have proposed when the input and output quantitative change is moving, to have the novel stagnant ring control mode of fast transient response characteristic.Through the feedback branch of design different output voltage and input voltage, combine the work characteristics of hysteresis comparator simultaneously, effectively regulate the pulse duration of control signal, realize the stable of output voltage.Because this control method only needs a hysteresis comparator and feedback factor to regulate resistance, the number of devices of control circuit significantly reduces, and cost and volume have all obtained bigger improvement.And, owing to there is not a use error amplifier, when having eliminated the phase delay problem that compensating circuit brings, effectively improved the dynamic characteristic of control circuit.At last through theory analysis and emulation with the basis of traditional control method contrast on, verified that this control method when load change changes with input voltage, has good stable state and dynamic characteristic.
Traditional PWM voltage control method circuit diagram as shown in Figure 1, Vi is an input voltage among the figure; MOS1, MOS2 are full-controlled switch pipe MOSFET or IGBT; L1 is a filter inductance; Co is a filter capacitor; Rc is an equivalent series resistance; Rc1, Rc2, Rc3, Rc4 are resistance; Ro is load; Vo is an output voltage; Vrc is a reference voltage; Vtri is a carrier voltage.Traditional output voltage
(1); Wherein D is a duty ratio, and r is a decompression DC transducer equivalent internal resistance.
Have the novel hysteresis control method thereof embodiment one and embodiment two circuit diagrams of electric voltage feed forward like Fig. 2, shown in 3, L is a filter inductance among the figure; Vu is a hysteresis comparator; R1, R2 are respectively bound threshold values size adjustment resistance; R is feedforward adjustment resistance; Rf is a feedback adjustment resistance; V1 is a reference voltage.
Switch periods T computing formula:
Hysteresis comparator threshold values high level voltage
;
Level voltage at the bottom of the hysteresis comparator threshold values
;
Output voltage
(3); Wherein Do is duty ratio Do=
, only when Vc=VL, D=Do; Kc is feedback oscillator Kc=
, V wherein
OL, V
OHBe hysteresis comparator output voltage (low level, high level) that Fig. 4 has the novel hysteresis control method thereof embodiment one of electric voltage feed forward and two schematic diagram of movements.
According to a that indicates among Fig. 2 and Fig. 3, b, u and 1,2 can draw 9 groups and connect combination, and it is as shown in Figure 5 to be respectively first combination: 1 connects a, and 2 connect b; Second combination is as shown in Figure 6: 1 connects u, and 2 connect b; The 3rd combination is as shown in Figure 2: 1 connects b, and 2 connect b; The 4th combination is as shown in Figure 7: 1 connects u, and 2 connect u; The 5th combination is as shown in Figure 3: 1 connects b, and 2 connect u; The 6th combination is as shown in Figure 8: 1 connects a, and 2 connect u; The 7th combination is as shown in Figure 9: 1 connects b, and 2 connect a; The 8th combination is shown in figure 10: 1 connects a, and 2 connect a; The 9th combination is shown in figure 11: 1 connects u, and 2 connect a.Wherein third and fourth, five, seven and nine combinations are all feasible, the existing document of the 4th combination relates to.Seven, nine be combined as non-stagnant ring control, the control output effect is undesirable.Seven, nine array output effects such as Figure 12 and output response curve shown in Figure 13, wherein input voltage is 5V, load is 0.6 Ω, voltage-target 4V.
But in these combinations in every kind of combination 2 link to each other between additional proportion or proportional integral link control.For example the 3rd the combination, just can 1 and b between additional proportion or proportional integral link, 2 and b between additional proportion or proportional integral link, the parameter of the ratio of adding or proportional integral link can be regulated according to circuit.
The quick hysteresis control method thereof that has electric voltage feed forward is made up of hysteresis comparator Vu and feedback bypass.Input voltage links to each other with capacitor C through resistance R, and input voltage links to each other with voltage V1 with R1 through resistance R 2 simultaneously.Output voltage V o links to each other with capacitor C through resistance R _ f.Change through input and output voltage causes the change in voltage at capacitor C two ends.
Based on the principle of capacitor C charge balance, realize the control that discharges and recharges and then realize comparator output duty cycle and the adjusting of cycle time.The variation essence of capacitor C voltage is the charge-discharge principle of capacitor C.The threshold voltage V that must depend on hysteresis comparator according to the time and the speed of capacitor charge and discharge
HAnd V
LThe reason of this two aspect of electric current of difference and flow through resistance R _ f and resistance R; Among the design; Through input voltage is linked to each other with capacitor C through resistance R; Output voltage links to each other with capacitor C through resistance R _ f, and then the common control that realizes the capacitor C charge-discharge velocity, and input voltage links to each other with reference voltage V1 with R1 through resistance R 2 simultaneously.Since threshold voltage
,
.It is thus clear that can make
and
change through voltage
so that threshold voltage
changes through input voltage.It is thus clear that in the new type of control method that proposes,, be achieved through quick dynamic adjustments and the response that utilizes input and output for influencing two factors that the electric capacity voltage changes.Capacitance voltage Vf to be detected has determined the shutoff and the ON time of power switch pipe.In a switch periods, the rising of voltage Vf and descending slope and input voltage and output voltage and threshold voltage are relevant, and therefore, the size of each switch periods can change because of the variation of input voltage and output voltage.Compare with traditional PWM voltage control method, when input voltage and load current change, input and output have been realized the compound control of electric voltage feed forward and feedback through common adjusting; Transient response time with output voltage is short; Overshoot is little, and it is little to fluctuate, and stability is high; The characteristics that error is controlled, thus satisfied better dynamic and static performance index.Difference between can finding out through emulation; Load current Io jumps when falling one times shown in Figure 14～16; Conventional P WM voltage control, new type of control method embodiment one, new type of control method embodiment one transient state response curve comprise load current IR, input voltage Vi and output voltage V o curve chart.When load current Io rises to one times shown in Figure 17～19, conventional P WM voltage control, new type of control method embodiment one, new type of control method embodiment one transient state response curve.Input voltage jumps and falls at 40% o'clock shown in Figure 20～22, conventional P WM voltage control, new type of control method embodiment one, new type of control method embodiment one transient state response curve.Input voltage rises at 40% o'clock shown in Figure 23～25, conventional P WM voltage control, new type of control method embodiment one, new type of control method embodiment one transient state response curve.
The comparison of new type of control method embodiment one and embodiment two:
During load variations, no matter be that load increases or reduces, embodiment one is littler than overshoot and the adjusting time of embodiment two, so in the frequent occasion of load variations, embodiment one is better than embodiment two.
When input voltage increased, embodiment two was bigger than the overshoot of embodiment one, but the adjusting time is little, and the voltage maintenance level of final embodiment two is better than embodiment one;
When input voltage descended, the overshoot of embodiment one and adjusting time were all less than embodiment two, and finally both voltage levvls all are stabilized in same numerical value.Because embodiment two steady state voltage levels are better than embodiment one, and the overshoot of two kinds of methods and adjusting time are quite near satisfying transient response fast, so change a frequent suitable embodiment two that selects for use to input voltage fully.
In sum, the fashionable control embodiment one that selects for use changes the frequent fashionable embodiment two that selects for use in field at input voltage in the frequent field of load variations.Integral body, the difference of embodiment one and embodiment two is little.
Claims (4)
1. quick hysteresis control method thereof that has electric voltage feed forward; It is characterized in that; Keeping on the basis of former PWM voltage switch partial circuit, changing original PWM voltage control circuit feedback fraction and be: output voltage is through the feedback adjustment resistance and the charging capacitor ground connection of series connection; Input voltage connects feedforward adjustment resistance and charging capacitor ground connection through the output of input MOS switching tube; Input voltage is through input MOS switching tube, connects ground connection behind two bound threshold values size adjustment resistance and the reference voltage of series connection; Charging capacitor voltage termination hysteresis comparator inverting input, two bound threshold values size adjustment resistance intermediate points connect the hysteresis comparator in-phase input end, and hysteresis comparator exports into that overdrive circuit connects input MOS switching tube grid; Obtain output voltage
, D wherein
oBe duty ratio D
o=
, K
cBe feedback oscillator K
c=
,
V L Be hysteresis comparator high level threshold voltage,
V OL ,
V OH Be respectively hysteresis comparator output low level, high level voltage, r is a decompression DC transducer equivalent internal resistance, and Ro is load, and R is feedforward adjustment resistance; Rf is a feedback adjustment resistance.
2. according to the said quick hysteresis control method thereof that has electric voltage feed forward of claim 1, it is characterized in that, but said input MOS switching tube outputs to the centre additional proportion or the proportional integral link of feedforward adjustment resistance.
3. according to the said quick hysteresis control method thereof that has electric voltage feed forward of claim 1, it is characterized in that, said
But the centre additional proportion or the proportional integral link of two bound threshold values size adjustment resistance of input MOS switching tube output.
4. according to the said quick hysteresis control method thereof that has electric voltage feed forward of claim 1; It is characterized in that; Said input voltage is through the output of input MOS switching tube; In the ground connection, the output of input MOS switching tube can be exported from MOS switching tube grid or source electrode behind two the bound threshold values size adjustment resistance that connects series connection and the reference voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210330523.3A CN102832814B (en) | 2012-09-10 | 2012-09-10 | Method for controlling hysteresis with voltage feedforward quickly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210330523.3A CN102832814B (en) | 2012-09-10 | 2012-09-10 | Method for controlling hysteresis with voltage feedforward quickly |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102832814A true CN102832814A (en) | 2012-12-19 |
| CN102832814B CN102832814B (en) | 2014-11-26 |
Family
ID=47335818
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210330523.3A Expired - Fee Related CN102832814B (en) | 2012-09-10 | 2012-09-10 | Method for controlling hysteresis with voltage feedforward quickly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102832814B (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103346663A (en) * | 2013-07-16 | 2013-10-09 | 上海电力学院 | Hysteresis control method of Boost convertor |
| CN103546034A (en) * | 2013-10-30 | 2014-01-29 | 上海电力学院 | Composite feedforward control type hysteresis control system |
| CN103701321A (en) * | 2014-01-03 | 2014-04-02 | 东南大学 | Synchronous rectification DC-DC (Direct Current) converter with rapid transient response buck |
| CN103762831A (en) * | 2014-02-20 | 2014-04-30 | 上海电力学院 | PWM voltage priority control circuit |
| CN104953832A (en) * | 2015-06-16 | 2015-09-30 | 南京矽力杰半导体技术有限公司 | Buck step-down circuit based on input voltage feedforward control and control method thereof |
| CN105739307A (en) * | 2016-01-29 | 2016-07-06 | 浙江大学 | Proportional pressure reducing valve hysteresis compensation device based on self-adaptive robust control and method thereof |
| CN109088541A (en) * | 2018-09-29 | 2018-12-25 | 天津大学 | A kind of switched-mode power supply of the quasi- fixed-frequency control of voltage hysteresis |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9935470B2 (en) * | 2015-10-27 | 2018-04-03 | Integrated Device Technology, Inc. | System and method for wireless power transfer using a power converter with a bypass mode |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6147478A (en) * | 1999-09-17 | 2000-11-14 | Texas Instruments Incorporated | Hysteretic regulator and control method having switching frequency independent from output filter |
| CN101145732A (en) * | 2006-09-11 | 2008-03-19 | 麦奎尔有限公司 | Ripple generation in buck regulator using fixed on-time control |
| US7459893B2 (en) * | 2006-04-20 | 2008-12-02 | Mark E Jacobs | Optimal feedback control of switch-mode power converters |
-
2012
- 2012-09-10 CN CN201210330523.3A patent/CN102832814B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6147478A (en) * | 1999-09-17 | 2000-11-14 | Texas Instruments Incorporated | Hysteretic regulator and control method having switching frequency independent from output filter |
| US7459893B2 (en) * | 2006-04-20 | 2008-12-02 | Mark E Jacobs | Optimal feedback control of switch-mode power converters |
| CN101145732A (en) * | 2006-09-11 | 2008-03-19 | 麦奎尔有限公司 | Ripple generation in buck regulator using fixed on-time control |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103346663A (en) * | 2013-07-16 | 2013-10-09 | 上海电力学院 | Hysteresis control method of Boost convertor |
| CN103546034A (en) * | 2013-10-30 | 2014-01-29 | 上海电力学院 | Composite feedforward control type hysteresis control system |
| CN103546034B (en) * | 2013-10-30 | 2016-02-03 | 上海电力学院 | A kind of compounding feedforward control type Hysteresis control system |
| CN103701321A (en) * | 2014-01-03 | 2014-04-02 | 东南大学 | Synchronous rectification DC-DC (Direct Current) converter with rapid transient response buck |
| CN103701321B (en) * | 2014-01-03 | 2015-12-30 | 东南大学 | A kind of fast transient response buck synchronous rectified DC-DC converter |
| CN103762831A (en) * | 2014-02-20 | 2014-04-30 | 上海电力学院 | PWM voltage priority control circuit |
| CN104953832A (en) * | 2015-06-16 | 2015-09-30 | 南京矽力杰半导体技术有限公司 | Buck step-down circuit based on input voltage feedforward control and control method thereof |
| CN104953832B (en) * | 2015-06-16 | 2017-11-07 | 南京矽力杰半导体技术有限公司 | The Buck step-down circuits and its control method controlled based on input voltage feed forward |
| CN105739307A (en) * | 2016-01-29 | 2016-07-06 | 浙江大学 | Proportional pressure reducing valve hysteresis compensation device based on self-adaptive robust control and method thereof |
| CN105739307B (en) * | 2016-01-29 | 2018-08-07 | 浙江大学 | The stagnant ring compensation device of proportional pressure-reducing valve based on adaptive robust control and method |
| CN109088541A (en) * | 2018-09-29 | 2018-12-25 | 天津大学 | A kind of switched-mode power supply of the quasi- fixed-frequency control of voltage hysteresis |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102832814B (en) | 2014-11-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102832814B (en) | Method for controlling hysteresis with voltage feedforward quickly | |
| CN203038149U (en) | Programmable low dropout linear regulator and sampling and feedback circuit thereof | |
| CN107070222B (en) | Control method of bidirectional DC/DC power converter control circuit | |
| CN201985759U (en) | DCDC (direct current direct current) output circuit | |
| US20120326688A1 (en) | Switching power supply with quick transient response | |
| CN203872056U (en) | Direct-current power supply controlled by constant power | |
| US20160181913A1 (en) | Negative Charge Pump Feedback Circuit | |
| CN103268134B (en) | The low difference voltage regulator of transient response can be improved | |
| CN103023326A (en) | Constant time control method, control circuit and switching regulator using same | |
| CN103095127A (en) | Charge pump circuit and electronic equipment | |
| CN103036432B (en) | Pulse width modulation (PWM) hysteresis control method based on ripple | |
| CN103066954B (en) | Ramp signal generation circuit and ramp signal adjustment circuit | |
| CN103346663A (en) | Hysteresis control method of Boost convertor | |
| CN103023327B (en) | A kind of quick Hysteresis control circuit of self-adaptative adjustment ring width | |
| CN103558891A (en) | Low dropout regulator | |
| CN103546034B (en) | A kind of compounding feedforward control type Hysteresis control system | |
| CN103841728A (en) | Multichannel load balancing steady flow control circuit, corresponding circuit combination and control method | |
| CN205210746U (en) | Constant current control ware and constant current control circuit | |
| CN204231712U (en) | A kind ofly utilize the linear constant current driver circuit for LED of the step-down of charge-discharge principle | |
| CN105162325A (en) | Pulse frequency modulation circuit based on reference voltage comparison oscillator | |
| CN102916470B (en) | A kind of energy content of battery carry circuit for energy trasfer between series-connected cell | |
| CN203942669U (en) | Equalizing control circuit and corresponding circuit combination | |
| CN204258639U (en) | The micropower high accuracy negative voltage output circuit of push-pull DC/DC converter | |
| CN102566642B (en) | High-voltage voltage-regulating circuit | |
| CN103049033A (en) | Constant current source circuit and sampling circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141126 Termination date: 20170910 |