WO1998030950A1 - Systeme d'interrupteur pour une alimentation en courant d'un equipement portable - Google Patents
Systeme d'interrupteur pour une alimentation en courant d'un equipement portable Download PDFInfo
- Publication number
- WO1998030950A1 WO1998030950A1 PCT/JP1997/001401 JP9701401W WO9830950A1 WO 1998030950 A1 WO1998030950 A1 WO 1998030950A1 JP 9701401 W JP9701401 W JP 9701401W WO 9830950 A1 WO9830950 A1 WO 9830950A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- power supply
- voltage
- external power
- battery
- portable device
- Prior art date
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Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/30—Means for acting in the event of power-supply failure or interruption, e.g. power-supply fluctuations
- G06F1/305—Means for acting in the event of power-supply failure or interruption, e.g. power-supply fluctuations in the event of power-supply fluctuations
Definitions
- the present invention relates to a power supply switching circuit used for a card-type portable device such as a memory card containing a plurality of batteries, and particularly to a voltage supply circuit for the card-type portable device.
- the present invention relates to a power supply switching circuit for a portable device, which is devised so that the internal battery is not consumed when a power supply is switched from an internal battery to an external power supply.
- Card-type portable devices conforming to the PCMCIA Personal Computer Computer Card International Standard
- PCMCIA Personal Computer Computer Card International Standard
- data is transferred from the computer to the card-type mobile device.
- Power for operating the card-type portable device at that time is supplied from the personal computer.
- the power supply for the operation of the card-type portable device is the internal battery. Therefore, a card-type portable device requires a power supply switching circuit to select the power supply from an external power supply (power supply on the PC side) and a built-in battery.
- the external power supply 600 (for example, 5 V) is connected to the portable device body 6 13 via the switch 62 and the diode 6 11.
- built-in battery for example, 5 V
- the portable device main body 613 (for example, 3 V) is connected to the portable device main body 613 via a diode 610.
- the switch 602 When the portable device is a single unit, the switch 602 is open, so that power is supplied to the portable device main body 613 from the built-in battery 604 through the diode 610. At this time, the diode 611 prevents the current from flowing out of the built-in battery 604 to the outside.
- a field effect transistor (hereinafter referred to as FET) is used between the built-in battery and the portable device body.
- An external power source 701 (for example, 5 V) is connected to the portable device main body 713 via a switch 702 and a die gate 711.
- the built-in battery 704 (for example, 3 V) is connected to the portable device main unit 13 via the P channel FET end 10.
- the source of the P-channel FET 710 is connected to the portable device body 713, and the drain is connected to the built-in battery 704.
- the gate of the FET 710 is connected to the external power supply switch 702 At the same time, it is connected to the negative electrode of the built-in battery 704 via the bias resistor 709.
- the negative electrode of the built-in battery 704 is connected to the negative electrode of the external power supply 701 and the negative terminal of the portable device body 713.
- the drain of the FET 710 is connected to the positive electrode 3 V of the internal battery end 04, and the gate is set to the bias resistance 709. And connected to the negative electrode 0 V of the built-in battery 704, respectively.
- the source of the FET 710 is almost at the drain voltage (3 V) due to the parasitic diode between the drain and the source. As a result, the source-gate voltage becomes 13 V. Therefore, FET 710 becomes conductive, and the voltage (3 V) of built-in battery 704 continues to be supplied to portable device body 713. At this time, the diode 711 prevents the current from flowing out of the built-in battery 704 to the outside.
- the gate and the source of the FET 710 are at the voltage of 5 V of the external power supply 701, and the drain is of the internal battery 704.
- the voltage becomes 3 V.
- the source-gate voltage becomes 0 V. Therefore, the FET 710 is turned off, preventing the voltage of the built-in battery 704 from being supplied to the portable device main unit 713, and the voltage of the external power supply 701 being switched to the 5 V power switch 710. 2.
- the parasitic diode of the FET 710 in the cut-off state charges the internal battery 704 with the voltage of the external power supply 701 To prevent this from happening.
- PCMCIA card card In the case of a general computer, the PCMCIA card card is often used to supply 5 V to the E-Iss.
- PCMCIA standard memory cards that are used by inserting them into a personal computer often have a built-in 3V coin-type lithium battery.
- the voltage of the external power supply is higher than the voltage of the built-in battery, so the above two conventional examples are applied, and while the external power is supplied. Can eliminate unnecessary consumption of the built-in battery.
- card-type portable devices are more advantageous to use two 3-volt coin-type lithium batteries in series at 6 V because of the power consumption.
- the voltage of the external power supply (5 V) is lower than the voltage of the internal battery (6 V), so such a card-type portable device is a PCMCIA card interface. It cannot be used in combination with a general computer that supplies 5 V to the power supply.
- An object of the present invention is to provide a portable device that uses two or more built-in batteries connected in series, even if the voltage of the external power supply of the portable device is lower than the voltage of the built-in battery of the portable device, but not less than a certain level. Power supply switching circuit for mobile devices, so that the voltage of the external power supply of the mobile device can be supplied to the mobile device without causing the internal battery to be consumed. Is to do.
- a power supply switching circuit of the present invention comprises: a power supply path for supplying power from an external power supply and power from a built-in battery to a portable device main body; and a power supply path between the built-in battery and the portable device main body. Receiving the value of the voltage supplied from the external power supply and the first signal for switching the first switching element to the cut-off state when the voltage exceeds a certain level. And an external power supply voltage detection circuit for outputting a second signal for switching the switching element to a conductive state if the voltage does not exceed a certain level.
- the switching element is a P-channel field effect element, the drain of which is connected to the internal battery, the source is connected to the power input of the mobile device itself, and the gate is connected to the external power supply voltage.
- Each is connected to a detection circuit.
- the source gate Since the voltage difference between them becomes equal to or less than the threshold value of the P-channel field-effect element, the P-channel field-effect element is cut off. Therefore, only the voltage of the external power supply is supplied to the portable device itself.
- the P-channel field effect element causes a voltage difference between the source and the gate. Because it exceeds the threshold, it conducts, The voltage of the built-in battery is supplied to the portable device body.
- the switching element and the external power supply voltage detecting circuit are both P-channel field effect elements, and the field effect element of the switching element has a drain connected to the external power supply and a source connected to the external power supply.
- the gate is connected to the input side of the constant voltage regulator, the gate is connected to the output side of the level shifter, and the field effect element of the external power supply voltage detection circuit has a drain connected to the input side of the level shifter and a source connected to the external power supply.
- the gate is connected to the output side of the constant voltage regulator.
- FIG. 1 is a block diagram showing a first embodiment of the power supply switching circuit according to the present invention.
- FIG. 2 is a block diagram showing a second embodiment of the power supply switching circuit according to the present invention.
- FIG. 3 is a diagram illustrating the operation of the power supply switching circuit of FIG.
- FIG. 4 is a block diagram showing a third embodiment of the power supply switching circuit according to the present invention.
- Fig. 5 shows the equivalent circuit of the inverter in the level shift circuit in Fig. 4.
- Figure 6 shows an example of a conventional power supply switching circuit.
- FIG. 7 shows another example of a conventional power supply switching circuit.
- FIG. 1 The first embodiment of a power supply switching circuit for supplying external power from a computer to a card-type portable device having a built-in battery and having a PCMCIA standard interface is shown in FIG. This will be described with reference to a diagram of FIG.
- the combination of the external power supply 101 and the switch 102 represents, for example, an external power supply (low-voltage generation source) supplied from the personal computer.
- the external power supply 101 may be a battery.
- the external power supply 101 is connected to the portable device main body 113 via the switch 102 and the diode 111.
- the voltage of the first and second internal batteries 103 and 104 connected in series via the first P-channel FET 107 is changed to the second P-channel FET 110 0 is connected to the main body of mobile device 1 1 3.
- Each of the built-in batteries 103 and 104 may be a single battery or a battery in which several batteries are connected in series.
- a resistor ⁇ 08 and a resistor 109 are connected in series to the external power supply 101 and the switch 102.
- the drain of the first P-channel FET 107 is connected to the negative electrode of the first internal battery 103, the source is connected to the positive electrode of the second internal battery 104, and the gate is connected to the resistor 1 They are connected in the middle between the resistor 08 and the resistor 109, respectively.
- the drain of the second P-channel FET 110 is connected to the positive terminal of the second internal battery 103, the source is connected to the positive terminal of the portable device body 113, and the gate is connected to the gate.
- the negative electrode of the external power supply 101, the negative electrode of the second internal battery 104, and the negative terminal of the portable device body 113 are commonly grounded.
- a second diode 105 is connected between the positive electrode of the first internal battery 103 and the positive electrode of the second internal battery 104. Further, a third diode 106 is connected between the negative electrode of the first internal battery 103 and the negative electrode of the second internal battery 104.
- the external power supply 101 is set to 5 V
- the voltage of the first and second internal batteries 103 and 104 is set to 3 V
- the resistance 108 is set to 68 kQ
- the resistance is set to 68 kQ.
- 1 08 be 1 0 0 k Q.
- the threshold value of the source-gate voltage for the conduction of the first and second P-channel FETs 107 and 110 is set to 0.3 V.
- the gate of the second P-channel FET 110 is supplied with 5 V of the external power supply, and the source is similarly supplied with 5 V of the external power supply via the first diode 11 1. Therefore, the source-gate voltage is 0 V, and the second P-channel FET 107 is also shut off.
- the switch 102 when the switch 102 is closed, the first and second P-channel FETs 107 and 110 are both cut off, and the first and second internal batteries 10 and 10 are closed. 3, the voltage of 104 is The supply to the portable device body 1 13 is cut off, and the voltage 5 V of the external power supply 102 is supplied to the portable device body ⁇ 13.
- the source-gate voltage is It becomes 6 V, and the second P-channel FET 110 also becomes conductive.
- the switch 102 when the switch 102 is opened, the first and second P-channel FETs 107 and 110 are both conductive, and the first and second internal batteries connected in series are connected.
- the voltage 6 V of 103 and 104 is supplied to the main body 113 of the portable device.
- the first diode 11 1 prevents the voltage 6 V of the internal batteries 103 and 104 from flowing out to the external personal computer.
- the second and third diodes 105 and 106 are bypass diodes for replacing the internal battery.
- Mobile devices When detached from the PC (that is, as described in (2) above, open switch 102 and apply the voltage of built-in batteries 103 and 104 to the main body of portable device 113
- the remaining internal battery 103 supplies its voltage of 3 V to the second conductive P-channel FET 110 and the third To the portable device main body 113 via the diode 106 of the above.
- the built-in battery 104 applies the voltage of 3 V to the second conducting P-channel FET. It is supplied to the portable device main body 113 through 110 and the second diode 105.
- the remaining built-in batteries will continue to supply that voltage to the portable device body 113.
- the contents stored in the memory of the portable device main body 113 and the contents of timekeeping can be retained even when the battery is replaced.
- the vertical axis represents the voltage level
- the horizontal axis represents the time.
- Curve 310 represents the voltage of the first internal battery 103
- curve 302 represents the voltage of the second internal battery section 104
- curve 303 represents the external supply voltage
- curve 3 represents the external supply voltage.
- 0 5 is a portable device
- the voltage levels finally applied to the main body 1 1 and 3 are shown respectively.
- the straight line 304 indicates the conduction threshold level of the first P-channel FET 107.
- section T1 the mobile device is disconnected from the personal computer, and the voltage (6 V) of the internal batteries 103 and 104 is supplied to the mobile device main body 113.
- the supply voltage of 6 V is shown as curve 305.
- Section T2 is the period during which the second internal battery is removed from the mobile device for replacement. Therefore, as described in (3) above, the mobile device body 113 is supplied with the voltage of 3 V of the first internal battery 103.
- Section T3 is a period in which the second internal battery is replaced with another one and attached to the portable device, and the portable device is also in a state where both the first and second internal batteries are attached. Its voltage level is 6 V, as in section T1.
- Section T4 is the period during which the first internal battery is removed from the mobile device for replacement. Therefore, the portable device main body 113 is supplied with the voltage of 3 V of the second internal battery.
- section T5 after replacing the first built-in battery with another one and attaching it to the portable device, it was inserted into the personal computer and the voltage of the external power supply 101 was supplied to the portable device body 113. This is a period in which the relationship between the external power supply voltage and the switching at that time is clearly shown on the time axis.
- This section T5 starts and the voltage of the external power supply 101 Until the level (described later) is reached, the portable device body 113 is supplied with the voltage 6 V of the first and second internal batteries 103 and 104. During that time, the first P-channel FET 107 is in a conductive state. By the way, since the voltage of 3 V of the second internal battery 104 is supplied to the source of the first P-channel FET 100, if the voltage of 2.5 V or more is supplied to the gate, the source When the gate-to-gate voltage exceeds 0.5 V, the first P-channel FET 107 switches to the cutoff state.
- the numerical value 100 in the left calculation formula is the value of the resistor 109 (kQ)
- 68 is the value of the resistor 108 (k ⁇ ). That is, when the voltage of the external power supply 101 rises to 4.2 V when the section T5 starts, the first P-channel FET 107 is cut off. Level 304 in Fig. 3 indicates this 4.2 V.
- the voltage of the external power supply 10 rises to reach 4.2 V, and the voltage 6 V of the first and second internal batteries 103 and 104 is supplied to the main body of the portable device 113. Start when no longer available.
- the voltage of the external power supply 101 rises from 4.2 V to 5 V, and then stabilizes at that value of 5 V.
- this embodiment is a portable device using a plurality of built-in batteries in series, and the voltage of the external power supply is lower than the voltage of the built-in battery (for example, 6 V). Even if the voltage of the external power supply is more than a certain value (for example, 4.2 V or more), the internal battery is consumed based on the voltage of one internal battery that is lower than the external power supply voltage. An excellent power supply switching circuit that can supply an external power supply voltage to portable equipment has been realized.
- FIG. 2 shows a block diagram of a second embodiment of a power supply switching circuit for supplying external power from a personal computer to a card-type portable device having a built-in battery and a PCMCIA standard interface. This will be described with reference to a diagram of FIG.
- the switching circuit according to this embodiment is different from the switching circuit according to the first embodiment shown in FIG. 1 in that the resistor 108 is replaced with a P-channel FET, and the first diode 11 1 It is almost equivalent to the one with a constant voltage regulator between 1 and the portable device body 1 13.
- the external power source 201 supplies a voltage to the portable device main body 211 via the first diode 211 and the constant voltage regulator 212.
- the first built-in battery 203 and the second built-in battery 204 are connected in series via a first P-channel FET 207, and a second P-channel FET 207 is connected. Supply voltage to the main body 2 13 of the portable device via 0 8 and the constant voltage regulator 2 1 2
- a third P-channel is connected between the positive side of the external power supply 201 (switch 202) and the gate of the first P-channel FET 207.
- Channel FET 208 is connected.
- the source of this third P-channel FET 208 is on the positive side of the external power supply 201, the drain is on the gate of the first P-channel FET 207, and the gate is a constant voltage. Connected to the output side of the regulator 2 2.
- the negative electrode of the external power supply 201, the negative electrode of the second built-in battery 204, and the negative terminal of the portable device body 2 13 are commonly grounded.
- the gate of the first P-channel FET 207, the gate of the second P-channel FET 210 and the drain of the third P-channel FET 208 are connected to each other. And is connected to the common ground through a resistor 209.
- a second diode 205 is connected between the positive electrode of the first internal battery 203 and the positive electrode of the second internal battery 204.
- a third diode 206 is connected between the negative electrode of the first internal battery 203 and the negative electrode of the second internal battery 204.
- the external power supply 202 is set to 5 V
- the voltage of the first and second internal batteries 103 and 104 is set to 3 V
- the resistance 209 is set to 100 ⁇ . . 1st, 2nd and 3rd tiers
- the threshold value of the source-gate voltage for the conduction of T207, 210, and 208 is set to 0.5 V, respectively.
- the output voltage of the constant voltage regulator is set to 3.3 V.
- the voltage of 5 V of the external power supply 201 is supplied to the source of the third channel FET 208, and the output voltage of the constant voltage regulator 212 to the gate is 3. 3 V is supplied.
- the third channel FET 208 has a source-gate voltage of 1.7 V and conducts, and both the drain and the source have the voltage of 5 V of the external power supply 201.
- the voltage of 5 V is supplied to the gate of the first channel FET 207 and the gate of the second channel FET 210.
- the gate of the first channel F F207 is supplied with 5 V from the drain of the third channel F ⁇ 208, and the source is supplied with the second voltage. 3 V of built-in battery 204 is supplied. As a result, the source-gate voltage of the first channel FET 207 becomes +2 V, and is cut off, and the first internal battery 203 and the second internal battery 200 The connection with 4 is cut off.
- the gate of the second channel FET 210 is supplied with 5 V power from the drain channel of the third channel FET 208 and the source is supplied with the first die.
- a voltage of 5 V of the external power supply 201 is supplied via the capacitor 211.
- the voltage between the source and the gate of this second channel F 210 becomes 0 V, and the state is cut off. That is, when the switch 202 is closed, first, the third P-channel FET 208 becomes conductive, and as a result, the first P-channel FET 207 and the second P-channel FET 207 are turned on.
- the FET 210 is shut off, and the supply of voltage from the first and second internal batteries 203 and 204 is stopped.
- the 5 V voltage of the external power supply 201 is supplied to the constant voltage regulator 212, and the constant voltage regulator 212 regulates the stabilized voltage of 3.3 V to the portable device. Supply to main body 2 1 3.
- the switch 202 is opened to disconnect the external power supply 201 from the constant voltage regulator.
- the gate of the P-channel FET 208 is supplied with 3 V from the constant voltage regulator 212, and the source is supplied with 0 V from the external power supply 201.
- the third P channel FET 208 has the source-gate voltage of +3, 3 V and is cut off.
- the gate of the first P-channel FET 207 is grounded via the resistor 209, so that 0 V is supplied to the gate, and the source is 3 V from the second internal battery 204. Is supplied.
- the first P-channel FET 207 has a source-gate voltage of 13 V and becomes conductive. Therefore, a voltage of 6 V from the first and second internal batteries 203 and 204 connected in series is supplied to the drain of the second P-channel FET 210. .
- This second P-channel FET 210 is connected to the source due to the presence of a parasitic diode between the drain and the source. Is also supplied with a voltage of 6 V. On the other hand, the gate is grounded via the resistor 209 and is at 0 V. As a result, the voltage between the source and the gate of the second P-channel FET 210 becomes 16 V, and the second P-channel FET 210 becomes conductive.
- both the first P-channel FET 207 and the second P-channel FET 210 are connected.
- First and second built-in batteries connected in series by conducting
- a voltage of 6 V from 203 and 204 is supplied to the constant voltage regulator 212. At this time, the first diode 2 1 1 prevents this 6 V from flowing out. Constant voltage regulator supplied with 6 V 2 1 2 stabilized 3,
- bypass diode for replacing the built-in battery
- the functions of the second and third diodes 205 and 206 as the bypass diodes are the same as those of the first and second embodiments. Since the function is the same as that of the third diodes 105 and 106, the description is omitted.
- the portable device When the portable device is inserted into the personal computer and the voltage of the external power supply 201 is supplied to the portable device main body 211, the portable device is kept in the portable power supply until the voltage of the external power supply 201 rises to a predetermined level (described later).
- the voltage of 6 V of the first and second built-in batteries 203 and 204 is continuously supplied to the constant voltage regulator 212 of the device body 113.
- the source-gate voltage of the third P-channel FET 208 becomes 10 or more than 5 V, as described above, the third P-channel FET 208 becomes conductive.
- the first and second channel FETs 207 and 208 are shut off, and the voltage 6 V of the first and second internal batteries 203 and 204 is changed to a constant voltage regulator.
- the built-in battery connected in series is 6 V and a voltage of 3 or 8 V or more is supplied from an external power supply, the voltage is supplied from the external power supply to the portable device itself.
- this embodiment is a portable device using a plurality of built-in batteries in series, and the voltage of the external power supply is lower than the voltage of the built-in battery (for example, 6 V). Even in this case, if the voltage of the external power supply is higher than a certain value (for example, 3 or 8 V or higher), an excellent power supply switch that can supply the external power supply voltage to the portable device without draining the internal battery The circuit has been realized.
- a certain value for example, 3 or 8 V or higher
- FIG. 3 shows a third embodiment of a power supply switching circuit for supplying external power from the PC to a portable type portable device that has a PCMCIA standard interface with a built-in battery. This will be described with reference to the drawings.
- the first and second built-in batteries 403 and 404 connected in series are the first and second P-channel FETs 414 and 415, and the constant voltage regulator 41.
- the voltage is supplied to the portable device main body 4 18 via 7.
- the voltage of the external power supply 401 is supplied to the portable device main body 418 via the switch 402 and the third chan- nel channel 416 and the constant voltage regulator 417. Supply voltage.
- the channel FET 410 constitutes a flip-flop type level shifter 419 (a portion surrounded by a dotted line in FIG. 4).
- One output of the level shifter 419 is connected to the gates of the first and second channel FETs 414 and 415, and the other output of the level shifter 419 is The gates of the third P-channel FETs 416 are respectively connected to the gates.
- Diodes 405 and 406 supply the higher power supply voltage of the internal battery and the external power supply to the flip-flop of the level shifter 419, and the inverter 411 supplies the same to the flip-flop. Output voltage of constant voltage regulator 4 17 is supplied.
- the source of the fourth P-channel FET 412 is connected to the external power supply 411 (switch 402), and the gate is connected to the output of the constant-voltage regulator 417. Are grounded to a common potential via a resistor 413 to form a voltage detection circuit of an external power supply.
- the source of the fourth P-channel FET 412 is the output of the voltage detection circuit and is connected to the input of the level shifter 419.
- the external power supply 401 is set to 5 V
- the voltages of the first and second internal batteries 400 and 404 are set to 3 V
- the fourth channel F is set to 4 V.
- the threshold value of the source-gate voltage of 12 is -0.5 V
- the output of the constant voltage regulator is 3.3 V.
- the constant voltage regulator 417 supplies a predetermined voltage to the portable device main body 213.
- the external power supply 401 is supplied to the source of the fourth P-channel FET 412, and 3.3 V of the output voltage of the constant voltage regulation 417 is supplied to the gate.
- the input of the level shifter 419 becomes the external power supply voltage of 5 V, and is connected to the gates of the first and second P-channel FETs 414, 415 of the level shifter 419.
- the output that is "1" is supplied.
- the voltage of "0" is supplied to the other outputs of the level shifter 419 connected to the gate of the third P-channel FET 416.
- the higher power supply voltage of the internal battery and the external power supply is supplied to the level shifter 419 via diodes 405 and 406.
- a voltage of 6 V of the series voltage of the first and second internal batteries 403 and 404, which is higher than the voltage 5 V of 1, is supplied, and the voltage of the output "1" of the level shifter is 6 V.
- the source voltage of the third P-channel FET 416 is 5 V
- the gate voltage is 0 V
- the source-gate voltage is —5 V
- the third P-channel FET 41 16 6 is conductive
- the source voltage of the first P-channel FET 4 14 is 6 V
- the gate voltage is also 6 V
- the source-gate voltage is 0 V
- the first P-channel FET 4 14 is cut off
- the source voltage of the second P-channel FET 4 15 is 5 V
- the gate voltage is 6 V
- the source-gate voltage is +1 V
- the second P-channel FET 4 415 is cut off
- the voltage of the first and second internal batteries 403 and 404 is not input to the constant voltage regulator 417.
- the output connected to the gates of the first and second P-channel FETs 414 and 415 of the level shifter 419 is "0" and the third P-channel FET 4
- the other outputs of the level shifter 4 19 connected to the gate of 16 are "1".
- the voltage of the level shifter output "1" is 6 V.
- the source voltage of the first P-channel FET 414 is 6 V
- the gate voltage is 0 V
- the source-to-gate voltage is 16 V
- the first P-channel FET The channel FET 414 is conducting
- the source voltage of the second P-channel FET 415 is also 5 V
- the gate voltage is 0 V
- the source-gate voltage is 16 V
- the second P-channel FET 415 The channel FET 415 also conducts
- the third P channel FE 411 is at a source voltage of 6 V and a gate voltage of 6 V.
- the gate-to-gate voltage is 0 V and the third P channel
- the channel FET 416 is shut off, and the voltages of the first and second internal batteries 403 and 404 are input to the constant voltage regulator 417.
- This insulator 411 has a CMOS structure of an N-channel FET 502 and a P-channel FET 503 as a basic structure, and a diode having an anode as a common.
- a ⁇ -type gate protection circuit consisting of capacitors 504 and 506 and a resistor 505 is attached. This MOS gate can apply a cutoff voltage exceeding the source voltage of the ⁇ channel FET503.
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP97919654A EP0952512A4 (en) | 1997-01-14 | 1997-04-23 | POWER SUPPLY CIRCUIT FOR PORTABLE DEVICE |
US09/117,660 US6060789A (en) | 1997-01-14 | 1997-04-23 | Power supply switching circuit for portable equipment |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9/4487 | 1997-01-14 | ||
JP9004487A JPH09269852A (ja) | 1996-01-29 | 1997-01-14 | 電源切り換え回路および携帯機器 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998030950A1 true WO1998030950A1 (fr) | 1998-07-16 |
Family
ID=11585458
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1997/001401 WO1998030950A1 (fr) | 1997-01-14 | 1997-04-23 | Systeme d'interrupteur pour une alimentation en courant d'un equipement portable |
Country Status (3)
Country | Link |
---|---|
US (1) | US6060789A (ja) |
EP (1) | EP0952512A4 (ja) |
WO (1) | WO1998030950A1 (ja) |
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DE10215494A1 (de) * | 2002-04-09 | 2003-11-06 | Bayer Ag | Computersystem für das Wissensmanagement |
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JPH1173247A (ja) * | 1997-06-27 | 1999-03-16 | Canon Inc | I/oカード、電子機器、電子システム及び電子機器の立ち上げ方法 |
JP2000148310A (ja) * | 1998-11-04 | 2000-05-26 | Nec Yonezawa Ltd | 携帯用情報機器の選択型電源供給システム |
JP2000184264A (ja) * | 1998-12-14 | 2000-06-30 | Olympus Optical Co Ltd | カメラ |
JP3578656B2 (ja) * | 1999-03-04 | 2004-10-20 | 矢崎総業株式会社 | 電源供給装置 |
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- 1997-04-23 US US09/117,660 patent/US6060789A/en not_active Expired - Fee Related
- 1997-04-23 EP EP97919654A patent/EP0952512A4/en not_active Withdrawn
- 1997-04-23 WO PCT/JP1997/001401 patent/WO1998030950A1/ja not_active Application Discontinuation
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Also Published As
Publication number | Publication date |
---|---|
US6060789A (en) | 2000-05-09 |
EP0952512A4 (en) | 2000-09-13 |
EP0952512A1 (en) | 1999-10-27 |
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