WO2006043479A1 - スイッチング電源装置およびそれを用いた電子機器 - Google Patents
スイッチング電源装置およびそれを用いた電子機器 Download PDFInfo
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- WO2006043479A1 WO2006043479A1 PCT/JP2005/018961 JP2005018961W WO2006043479A1 WO 2006043479 A1 WO2006043479 A1 WO 2006043479A1 JP 2005018961 W JP2005018961 W JP 2005018961W WO 2006043479 A1 WO2006043479 A1 WO 2006043479A1
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- charging period
- capacitor
- power supply
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
- H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
- H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
- H02M3/071—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps adapted to generate a negative voltage output from a positive voltage source
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
- H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
- H02M3/073—Charge pumps of the Schenkel-type
- H02M3/077—Charge pumps of the Schenkel-type with parallel connected charge pump stages
Definitions
- the present invention relates to a charge pump type switching power supply device.
- the output voltage of the battery is higher than the output voltage of a battery, such as an LED (Light Emitting Diode) used for a backlight of a liquid crystal.
- a battery such as an LED (Light Emitting Diode) used for a backlight of a liquid crystal.
- LED Light Emitting Diode
- the output voltage is usually about 3.5 V, and the power LED that is about 4.2 V even when fully charged is used as the drive voltage. Requires a higher voltage than the battery voltage.
- the battery voltage is boosted using a booster circuit such as a switched capacitor method, and the voltage necessary to drive a load circuit such as an LED is obtained. It has gained.
- a negative power supply may be required. In such a case, a desired negative voltage is obtained using a switched capacitor type voltage inverting circuit (patents). Reference 1).
- Patent Document 1 Japanese Patent Application Laid-Open No. 2001-258241
- One embodiment of the present invention is a switching power supply device that generates and outputs two different first and second output voltages from one input voltage.
- the switching power supply device includes a flying capacitor, a first output capacitor, a second output capacitor, and control means for controlling the charge states of the three capacitors.
- the control means includes a first charging period in which the flying capacitor is charged with the input voltage, and a second charging in which the input voltage is applied to the low potential terminal of the flying capacitor and the first output capacitor is charged with the voltage appearing at the other end.
- the first charging time and the second charging time are repeated in a time-sharing manner, and the third charging period in which the high voltage side terminal of the flying capacitor is connected to the fixed potential terminal and the second output capacitor is charged by the voltage appearing at the other end.
- Output capacitor capacitor Outputs first and second output voltages, respectively.
- the switching power supply device includes a flying capacitor, a first output capacitor, a second output capacitor, and control means for controlling the charging state of the three capacitors.
- the control means applies the second input voltage to the low potential side terminal of the flying capacitor and charges the first output capacitor by the voltage appearing at the other end during the first charging period in which the flying capacitor is charged with the first input voltage.
- the second charging period for charging and the third charging period for charging the second output capacitor with the voltage appearing at the other end by connecting the high voltage side terminal of the flying capacitor to the fixed potential terminal are time-divided. Repeatedly, the first and second output capacitor outputs the first and second output voltages, respectively.
- the sum of the first and second input voltages can be generated as the first output voltage, and the inverted voltage of the input voltage can be generated as the second output voltage, and the flying capacitor can be shared.
- the circuit configuration can be simplified by using it.
- the control means includes a first charging period, a second charging period, a first charging period, and a third charging period. As well, you can control the charge state of the three capacitors.
- the switching power supply device includes a flying capacitor, a first output capacitor provided between a first output terminal that outputs a first output voltage and a fixed potential terminal, and a second output terminal that outputs a second output voltage. And a second output capacitor provided between the fixed potential terminal, a first switch provided between one end of the flying capacitor and the input terminal to which the input voltage is applied, and between the other end of the flying capacitor and the input terminal.
- a second switch provided, a third switch provided between one end of the flying capacitor and the fixed potential terminal, a fourth switch provided between the other end of the flying capacitor and the fixed potential terminal, and one end of the flying capacitor.
- the fifth switch provided between the first output terminals, the sixth switch provided between the other end of the flying capacitor and the second output terminal, and the first force also applied to the sixth switch. And a controller for controlling on / off of the switch.
- the first output capacitor and the second output are obtained by commonly using the flying capacitor in the switching power supply device that generates two output voltages, and further turning on and off the plurality of switches by the control unit. Charge the capacitor with a different voltage.
- a voltage twice the input voltage can be output from the first output capacitor, and a voltage obtained by inverting the input voltage can be output from the second output capacitor.
- the control unit turns on the first switch and the fourth switch to charge the flying capacitor with the input voltage, and turns on the second switch and the fifth switch to turn on the first output terminal force.
- a second charging period in which a voltage approximately twice the input voltage is output, and a third charging period in which the third switch and the sixth switch are turned on to output a voltage obtained by inverting the input voltage from the second output terminal May be repeated by time division.
- the first to sixth switches are time-divided and turned on / off, and the charge supplied to the flying capacitor is alternately supplied to the first and second output capacitors, so that the first output capacitor has twice the input voltage. Voltage can be output simultaneously from the second output capacitor by inverting the input voltage.
- Another aspect of the present invention is also a switching power supply apparatus that generates and outputs two different first and second output voltages from the first and second input voltages.
- This switching power supply is Between the first output capacitor that outputs the first output voltage and the fixed potential terminal, and between the second output terminal that outputs the second output voltage and the fixed potential terminal.
- the second output capacitor provided, the first switch provided between one end of the flying capacitor and the first input terminal to which the first input voltage is applied, the other end of the flying capacitor and the second input voltage are applied.
- a second switch provided between the second input terminals, a third switch provided between one end of the flying capacitor and the fixed potential terminal, and a second switch provided between the other end of the flying capacitor and the fixed potential terminal. 4 switches, a fifth switch provided between one end of the flying capacitor and the first output terminal, a sixth switch provided between the other end of the flying capacitor and the second output terminal, and first to sixth switches.
- a control unit for controlling on and off of pitch, a.
- the switching power supply device that generates two output voltages uses the flying capacitor in common, and the plurality of switches are turned on and off by the control unit, whereby the first output capacitor and the second output Charge the capacitor with a different voltage.
- the first output capacitor can output the sum of the first input voltage and the second input voltage
- the second output capacitor can output a voltage obtained by inverting the input voltage.
- the control unit turns on the first switch and the fourth switch to charge the flying capacitor with the first input voltage, and turns on the second switch and the fifth switch to turn on the first output.
- 2nd charging period in which the sum of the 1st input voltage and 2nd input voltage is output from the terminal, and the 3rd and 6th switches are turned on to output the 2nd output terminal force.
- the third charging period may be repeated by time division.
- the control unit may control on / off of the first to sixth switches, with the first charging period, the second charging period, the first charging period, and the third charging period as one cycle.
- the switching power supply device includes a control transistor provided in series with the fifth switch between the first output terminal and one end of the flying capacitor, a first output voltage, and a predetermined output voltage. And an error amplifier that amplifies the error of the reference voltage and applies the error to the control terminal of the control transistor.
- the control terminal is the gate terminal in the FET (Field Effect Transitor). In a polar transistor, it refers to the base terminal.
- the first output voltage can be stabilized by providing a regulation function to the error amplifier and control transistor.
- the switching power supply device includes a control transistor provided in series with the third switch between the fixed potential terminal and one end of the flying capacitor, a second output voltage, and a predetermined reference voltage. And an error amplifier that amplifies the error and applies the error to the control terminal of the control transistor.
- the second output voltage can be stabilized by providing the error amplifier and the control transistor with a regulation function.
- Yet another embodiment of the present invention is a method for driving a switching power supply device.
- This switching power supply device driving method is a switching power supply device driving method that generates and outputs two different first and second output voltages from one input voltage.
- the driving method includes a first charging period for charging the flying capacitor with an input voltage, and a terminal on the low potential side of the flying capacitor. Is connected to the input voltage, the second charging period in which the first output capacitor is charged by the voltage appearing at the other end, the high voltage side terminal of the flying capacitor is connected to the fixed potential terminal, and the second voltage is The third charging period for charging the output capacitor and the time division are repeated.
- the first and second output voltages different from the first and second output capacitors can be output.
- Yet another embodiment of the present invention also relates to a switching power supply device.
- This switching power supply device includes the switching power supply device according to any one of the above aspects provided as the first charge pump circuit, the second flying capacitor, and the third output capacitor, and the first charge pump circuit force is also output.
- a second charge pump circuit that converts the output voltage into a predetermined voltage and outputs the output voltage as a third output voltage;
- the switching frequency of the second charge pump circuit is set to 1Z2 which is the switching frequency of the first charge pump circuit.
- the switching operation of the first charge pump circuit is controlled based on the first clock signal, and the switching operation of the second charge pump circuit is controlled based on the second clock signal obtained by dividing the first clock signal. You can control it.
- the frequency of charging the first output capacitor in the first charge pump circuit and the frequency of charging the second flying capacitor in the second charge pump circuit can be set equal.
- the first charge pump circuit performs a switching operation with the first charging period, the second charging period, the first charging period, and the third charging period as one cycle, while the second charge pump circuit performs the second charging period.
- the second flying capacitor may be charged during the period and the subsequent first charging period, and the third output capacitor may be charged during the third charging period and the subsequent first charging period.
- the first charge pump circuit performs a switching operation with the first charging period, the second charging period, the first charging period, and the third charging period as one cycle, while the second charge pump circuit includes the first charging period and the first charging period.
- the second flying capacitor may be charged in the subsequent second charging period, and the third output capacitor may be charged in the first charging period and the subsequent third charging period.
- the period of charging the first output capacitor of the first charge pump circuit can be synchronized with the period of charging the second flying capacitor in the second charge pump circuit. Can be suppressed.
- the second charge pump circuit may be an inverting charge pump circuit that inverts and outputs the first output voltage.
- Yet another embodiment of the present invention relates to an electronic device.
- This electronic device includes the above-described switching power supply device and a plurality of loads driven by voltages output from the switching power supply device.
- a voltage higher than the battery voltage and two or more different output voltages can be supplied to a plurality of loads.
- the switching power supply device can output a plurality of voltages with a simple circuit configuration.
- FIG. 1 is a circuit diagram showing a configuration of a switching power supply device according to a first embodiment.
- FIG. 2 is a time chart showing voltage time waveforms at each terminal of the switching power supply device of FIG. 1.
- FIG. 3 is a circuit diagram showing a configuration of a switching power supply device according to a second embodiment.
- FIG. 4 is a circuit diagram showing a configuration of a switching power supply device according to a third embodiment.
- FIG. 5 is a circuit diagram showing a configuration of a switching power supply device according to a fourth embodiment.
- FIG. 6 is a time chart showing an operating state of the switching power supply device of FIG.
- FIG. 7 is a circuit diagram showing a configuration of a switching power supply device according to a fifth embodiment.
- FIG. 8 is a circuit diagram showing a configuration of a control unit of the first charge pump circuit of FIG.
- FIG. 9 is a time chart showing an operating state of the switching power supply device of FIG.
- FIG. 10 is a block diagram showing a configuration of an electronic device equipped with the switching power supply device according to the embodiment.
- Cf flying capacitor Col first output capacitor, Co2 second output capacitor, Voutl first output voltage, Vout2 second output voltage, 10 control section, SW switch, 12 first error amplifier, 14 second error amplifier , Ml first control transistor, M2 second control transistor, ⁇ ⁇ first charging period, ⁇ 2 second charging period, ⁇ 3 third charging period, 100 switching power supply, 200 switching power supply.
- FIG. 1 is a circuit diagram showing a configuration of a switching power supply apparatus 100 according to the first embodiment of the present invention.
- This switching power supply device 100 includes an input terminal 102, a first output terminal 104, and a second output terminal 106 as input / output terminals, and an input voltage applied to the input terminal 102. Vin is boosted or voltage inverted and output from the first output terminal 104 and the second output terminal 106, respectively.
- the switching power supply device 100 includes a flying capacitor Cf, a first switch SW1 to a sixth switch SW6, a first output capacitor Col, a second output capacitor Co2, and a control unit 10.
- the first output capacitor Col is provided between the first output terminal 104 and a ground terminal having a fixed potential, and supplies electric charges to a load circuit connected to the first output terminal 104.
- the second output capacitor Co2 is provided between the second output terminal 106 and the ground terminal, and supplies electric charges to the load circuit connected to the second output terminal 106.
- the flying capacitor Cf is charged by the input voltage Vin applied to the input terminal 102, temporarily stores electric charge, and transfers the charge to the first output capacitor Col or the second output capacitor Co2.
- one end is 20 and the other end is 22, the voltage appearing at one end 20 is Vx, and the voltage appearing at the other end 22 is Vy.
- the first switch SW1 to the sixth switch SW6 are provided between the flying capacitor Cf, the first output capacitor Col, the second output capacitor Co2, and the ground terminal, respectively, and switch the charge / discharge state of each capacitor. .
- These first switch SW1 to sixth switch SW6 can be constituted by transistors such as MOSFETs (Metal Oxide Semiconductor Field Effect Transistors), and the ON / OFF of the switches can be controlled by the voltage applied to the gate terminal of the MOSFET.
- MOSFETs Metal Oxide Semiconductor Field Effect Transistors
- the first switch SW1 is provided between one end 20 of the flying capacitor Cf and the input terminal 102 to which the input voltage Vin is applied.
- the fourth switch SW4 is provided between the other end 22 of the flying capacitor Cf and the ground terminal.
- the period during which the second switch SW2 and the fifth switch SW5 are turned on and the first output capacitor Col is charged with the voltage Vx is defined as a second charging period ⁇ 2.
- the third switch SW3 is provided between one end 20 of the flying capacitor Cf and the ground terminal.
- the sixth switch SW6 is provided between the other end 22 of the flying capacitor Cf and the second output terminal 106.
- FIG. 2 is a time chart showing voltage time waveforms at each terminal of the switching power supply apparatus 100 of FIG.
- the controller 10 turns on the first switch SW1 and the fourth switch SW4 simultaneously to charge the flying capacitor Cf, turns on the first charging period ⁇ 1, and turns on the second switch SW2 and the fifth switch SW5.
- the second charging period ⁇ 2 for charging the first output capacitor Col, the third switch SW3 and the sixth switch SW6 are turned on to switch the third charging period ⁇ 3 for charging the second output capacitor Co2.
- the first charging period ⁇ 1 is interposed between the second charging period ⁇ 2 and the third charging period ⁇ 3, and the process is repeated in a time-sharing manner.
- the first charging period during the transition from the second charging period ⁇ 2 to the third charging period ⁇ 3 is assumed to be ⁇ 1, and conversely from the third charging period ⁇ 3 to the second charging period ⁇ 2.
- the first charging period during the transition is identified as ⁇ 1 '.
- the control unit 10 switches to the second charging period ⁇ 2.
- the fifth switch SW5 since the fifth switch SW5 is also turned on, the first output capacitor Col is charged with the voltage Vx. At this time, since the electric charge stored in the flying capacitor Cf is transferred to the first output capacitor Col, the potential difference Vx ⁇ Vy between the one end 20 and the other end 22 of the flying capacitor Cf is less than Vin / J. , It will be sad.
- the first charging period ⁇ 1 is reached again, and the first switch SW1 and the fourth switch SW4 are turned on, and the voltage across the flying capacitor Cf is recharged by the input voltage Vin.
- the voltage of the first output capacitor Col appears as the first output voltage Voutl.
- the first output capacitor Col is charged in the second charging period ⁇ 2, and the first and third charging periods ⁇ 1 and ⁇ 3 are discharged when a current flows through the load circuit connected to the second output terminal 106. Therefore, as shown in Fig. 2, the first output voltage Voutl rises to 2 X Vin during the second charging period ⁇ 2 and then the current flows through the load circuit during the period ⁇ 1, ⁇ 3, ⁇ 1 Gradually decreases.
- the voltage of the second output capacitor Co2 appears at the second output terminal 106 as the second output voltage Vout2.
- the second output capacitor Co2 is charged in the third charging period ⁇ 3, and is discharged in the first and second charging periods ⁇ 1 and ⁇ 2 when a current flows through the load circuit. Therefore, as shown in FIG. 2, the second output voltage Vout2 drops to Vin during the third charging period ⁇ 3, and then flows through the load circuit during the periods ⁇ 1, ⁇ 2, and ⁇ ′. Note that the vertical axis of the first output voltage Voutl and the second output voltage Vout2 in FIG. 2 is enlarged.
- the double voltage and the inverted voltage are generated from the input voltage Vin applied to the input terminal 102 with a simple circuit configuration, respectively. 1 and second output terminals 104 and 106 can output simultaneously.
- this switching power supply device 100 two switching power supply devices that respectively generate a double voltage and an inverted voltage are used by using the flying capacitor Cf in a time-sharing manner to generate two output voltages. Reduce one capacitor compared to be able to. Further, since the control unit 10 can be used in common, the circuit is simplified.
- the output voltage Voutl and Vout2 are less decreased, so in the time chart shown in FIG.
- the first charging period ⁇ 1 or ⁇ 1 may be omitted.
- the order of the first charging period ⁇ 1 to the third charging period ⁇ 3 may be changed according to the driving state of the load.
- FIG. 2 it is also possible to output only one of the forces described in the case where a double voltage is output from the first output terminal 104 and an inverting voltage is simultaneously output from the second output terminal 106. it can. For example, if only a double voltage is required, the first charging period ⁇ 1 and the second charging period may be repeated. Similarly, when only the inversion voltage is required, the first charging period ⁇ 1 and the third charging period ⁇ 3 may be alternately repeated.
- the switching power supply according to the second embodiment of the present invention is obtained by adding a regulation function for stabilizing the output voltage to the switching power supply 100 according to the first embodiment.
- FIG. 3 is a circuit diagram showing a configuration of a switching power supply apparatus 200 according to the second embodiment.
- the same or equivalent components are denoted by the same reference numerals, and description thereof will be omitted as appropriate.
- the switching power supply device 200 includes a first feedback resistor R1 to a fourth feedback resistor R4, a first error amplifier 12, a second error amplifier 14, A first control transistor Ml and a second control transistor M2 are included.
- the first and second feedback resistors Rl and R2, the first error amplifier 12 and the first control transistor Ml are provided to stabilize the first output voltage Voutl.
- the first output voltage Voutl is resistance-divided by the first and second feedback resistors Rl and R2 to the non-inverting input terminal of the first error amplifier 12, and Voutl XR2Z (R1 + R2) is input.
- the reference voltage Vref is input to the inverting input terminal.
- the first control transistor Ml is provided in series with the fifth switch SW5 between the first output terminal 104 and one end 20 of the flying capacitor Cf. 1st control transistor Ml is gate The on-resistance is changed by controlling the voltage, and has a function of adjusting the charging voltage of the first output capacitor Co 1 in the second charging period ⁇ 2.
- the output of the first error amplifier 12 is connected to the gate terminal of the first control transistor M1.
- Vref X Vref X (R1 + R2) ZR2.
- ⁇ VI corresponds to a reduced voltage of the first output voltage Voutl as shown in FIG.
- the third and fourth feedback resistors R3 and R4, the second error amplifier 14 and the second control transistor M2 stabilize the second output voltage Vout2.
- the second output voltage Voutl and the reference voltage Vref are divided and input by the third and fourth feedback resistors R3 and R4 to the non-inverting input terminal of the second error amplifier.
- the inverting input terminal is grounded.
- the second control transistor M2 is provided in series with the third switch SW3 between the ground terminal and one end 20 of the flying capacitor Cf.
- the output of the second error amplifier 14 is connected to the gate terminal of the second control transistor M2, and the second output voltage Vout2 is stabilized by changing its on-resistance.
- the second output voltage Vout2 approaches the target value given by R3ZR4 XVref.
- the second output voltage Vout2 can be stabilized to the target value regardless of load fluctuations or input voltage fluctuations.
- ⁇ 2 is the second output voltage Vout2 as shown in Fig. 2. Corresponds to the rising voltage.
- the switching power supply apparatus 200 As described above, according to the switching power supply apparatus 200 according to the second embodiment, the first output voltage Voutl or the second output voltage Vout2 due to load fluctuation or input voltage fluctuation by adding a regulation function. Fluctuations can be suppressed, and the target value determined by the reference voltage Vref and the feedback resistors R1 to R4 can be stabilized.
- FIG. 4 is a circuit diagram showing a configuration of a switching power supply apparatus 300 according to the third embodiment.
- Switching power supply device 300 according to the present embodiment generates and outputs two different first output voltage Voutl and second output voltage Vout2 from first input voltage Vinl and second input voltage Vin2.
- the first input voltage Vinl and the second input voltage Vin2 are applied to the first input terminal 102a and the second input terminal 102b, respectively.
- the second switch SW2 of the switching power supply apparatus 300 is provided between the other end of the flying capacitor Cf and the second input terminal 102b.
- switching power supply apparatus 300 is the same as the operation of switching power supply apparatus 100. That is, in the first charging period ⁇ 1, the control unit 10 turns on the first switch SW1 and the fourth switch SW4, and charges the flying capacitor Cf with the first input voltage Vin1.
- the control unit 10 turns on the second switch SW2 and the fifth switch SW5, applies the second input voltage Vin2 to the terminal 22 on the low potential side of the flying capacitor Cf, and so on.
- the control unit 10 uses the first charging period ⁇ 1, the second charging period ⁇ 2, the first charging period ⁇ 1, the third charging period ⁇ 3 as one cycle, and the flying capacitor Cf, the first output capacitor Col, the second output Controls the charge state of capacitor Co2.
- first output terminal 104 to first power supply The sum voltage of the first input voltage Vinl and the second input voltage Vin2 can be output, and the inverted voltage 1 Vinl of the first input voltage Vinl can be output from the second output terminal 106.
- FIG. 5 is a circuit diagram showing a configuration of a switching power supply apparatus 400 according to the fourth embodiment.
- the switching power supply device 400 according to the present embodiment includes the switching power supply device of FIG. 1 (referred to as the first charge pump circuit 410 in the present embodiment) and the second charge pump circuit provided as the first charge pump circuit. 420 and a frequency divider 430 are provided.
- the first output voltage V outl is applied as an input voltage to the input terminal 402 of the second charge pump circuit 420.
- the second charge pump circuit 420 is an inverting charge pump circuit that inverts and outputs the first output voltage Voutl, and a third output obtained by inverting the first output voltage Voutl. Output voltage Vout3 from output terminal 404.
- the second charge pump circuit 420 includes a second flying capacitor Cf 2, a third output capacitor Co3, switches SW21, SW22, SW23, SW24, and a control unit 40.
- a switch SW21 is provided between one end of the second flying capacitor Cf2 and the input terminal 402. Further, a switch SW22 is provided between one end of the second flying capacitor Cf2 and the ground. A switch SW23 is provided between the other end of the second flying capacitor Cf2 and the ground, and a switch SW24 is provided between the other end of the second flying capacitor Cf2 and the output terminal 404. A third output capacitor Co3 is provided between the output terminal 404 and the ground.
- the control unit 40 controls on / off of the switches SW21 to SW24 based on the second clock signal CLK2.
- the control unit 40 turns on the switches SW21 and SW23, turns off the switches SW22 and SW24, and charges the second flying capacitor Cf2 with the first output voltage Voutl.
- the control unit 40 turns off the switches SW21 and SW23 and turns on the switches SW22 and SW24 in the second state ⁇ 2, and turns on the charge stored in the second flying capacitor Cf2 in the first state ⁇ 1. Transfer to 3 output capacitor Co3 and charge 3rd output capacitor Co3.
- the switching operation of the first charge pump circuit 410 is the first clock input from the outside. Control is based on the clock signal CLK1.
- the frequency divider 430 outputs a second clock signal CLK2 obtained by dividing the first clock signal CLK1 by 1Z2.
- the switching frequency of the second charge pump circuit 420 is set to 1Z2 which is the switching frequency of the first charge pump circuit 410.
- FIG. 6 is a time chart showing an operation state of the switching power supply apparatus 400 of FIG.
- the first charge pump circuit 410 is based on the first clock signal CLK1, and the first charge period ⁇ 1, the second charge period ⁇ 2, the first charge period ⁇ 1, Switching operation is performed with the third charging period ⁇ 3 as one cycle.
- the second charge pump circuit 420 performs a switching operation based on the second clock signal CLK2.
- the second charge pump circuit 420 enters the first state ⁇ 1 for charging the second flying capacitor C2 during the second charge period ⁇ 2 and the subsequent first charge period ⁇ 1 in the first charge pump circuit 410,
- the third charge capacitor ⁇ 3 is charged in the third charge period ⁇ 3 and the subsequent first charge period ⁇ 1, and the second state ⁇ 2 is entered.
- switching power supply apparatus 400 for input voltage Vin, as first output voltage Voutl, second output voltage Vout2, and third output voltage Vout3, 2 Vin, -Vin, -Three voltages of 2Vin can be obtained. Therefore, in an electronic device equipped with the switching power supply device 400, when the input voltage Vin is combined, positive and negative power sources of Shi Vin and ⁇ 2 Vin can be supplied to the load.
- Switching power supply device 400 sets the switching frequency of second charge pump circuit 420 to 1Z2 of the switching frequency of first charge pump circuit 410, and in first charge pump circuit 410, In the second charge pump circuit 420, the phase for charging the first output capacitor Col and the phase for charging the second flying capacitor Cf2 are synchronously controlled. As a result, the change in the amount of charge stored in the first output capacitor Col can be suppressed, and the ripple of the first output voltage Voutl can be reduced. Further, the first output voltage Voutl, which is the input voltage of the second charge pump circuit 420, is reduced. By reducing the pull, the fluctuation of the third output voltage Vout3 output from the second charge pump circuit 420 can also be suppressed.
- the switching power supply apparatus 200 of FIG. 3 may be used as the first charge pump circuit 410.
- FIG. 7 is a circuit diagram showing a configuration of a switching power supply device 500 according to the fifth embodiment.
- Switching power supply device 500 according to the present embodiment includes first charge pump circuit 510 and second charge pump circuit 420.
- the configuration of the second charge pump circuit 420 is the same as that in FIG.
- FIG. 8 is a circuit diagram showing a configuration of the control unit 50 of the first charge pump circuit 510 of FIG.
- the control unit 50 includes a D latch circuit 52, a first AND gate 54, and a second AND gate 56.
- the first clock signal CLK1 is input to the clock terminal of the D latch circuit 52, and the data terminal is connected to the inverted output terminal.
- the output signal of the D latch circuit 52 is output to the second charge pump circuit 420 as the second clock signal CLK2.
- the frequency of the second clock signal CLK2 output from the D latch circuit 52 is 1Z2 of the first clock signal CLK1.
- the first AND gate 54 generates a logical product of the first clock signal CLK1 and the second clock signal CLK2.
- the control unit 50 sets the second charging period ⁇ 2. ⁇ This controls the on / off of the first switch SW1 to the sixth switch SW6.
- the second AND gate 56 generates a logical product of the first clock signal CLK1 and the inverted signal of the second clock signal CLK2.
- the control unit 50 determines that the third charging period ⁇ 3
- the first switch SW1 to the sixth switch SW6 are controlled on and off.
- FIG. 9 is a time chart showing the operating state of the switching power supply device 500 of FIG.
- the first charge pump circuit 510 performs the first charging period ⁇ 1, the second charging period ⁇ 2, the first charging period ⁇ 1, and the third charging period ⁇ 3 based on the first clock signal CLK1. Switching operation is performed as one cycle.
- the second charge pump circuit 420 charges the second flying capacitor Cf2 during the first charging period ⁇ 1 and the subsequent second charging period ⁇ 2 based on the second clock signal CLK2. 1
- the third output capacitor Co3 is charged during the charging period ⁇ 1 and the subsequent third charging period ⁇ 3.
- Switching power supply device 500 sets the switching frequency of second charge pump circuit 420 to 1Z2 of the switching frequency of first charge pump circuit 510, and in first charge pump circuit 510, The phase for charging the output capacitor Col and the phase for charging the second flying capacitor Cf 2 in the second charge pump circuit 420 are synchronously controlled. As a result, the change in the amount of charge stored in the first output capacitor Col can be suppressed, and the ripple of the first output voltage Voutl can be reduced. Further, by reducing the ripple of the first output voltage Voutl that is the input voltage of the second charge pump circuit 420, it is also possible to suppress the fluctuation of the third output voltage Vout3 output from the second charge pump circuit 420. it can.
- the switching power supply 200 of FIG. 3 may be used as the first charge pump circuit 510.
- FIG. 10 is a block diagram showing a configuration of an electronic device equipped with the switching power supply device according to the embodiment.
- the electronic device 1000 includes a battery 1010, a switching power supply device 1020, a first load 1030, and a second load 1040.
- the first output voltage Voutl is applied to the first load 1030 such as LED or LCD panel. Supplied.
- the second output voltage Vout2 is supplied to a second load 1040 that requires a negative power supply.
- the element formed of the MOSFET can be replaced with another transistor such as a bipolar transistor. These selections may be determined according to the semiconductor manufacturing process, cost, and use required for the circuit.
- the boost rate is 1.5 times or twice. Even a dip pump circuit! /.
- all elements constituting the switching power supply device 100 may be integrated or divided into separate integrated circuits, or a part thereof may be discrete. You may be comprised with components. Which part should be decided depends on the cost, occupied area, and usage.
- the switching power supply device can output a plurality of voltages with a simple circuit configuration.
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Description
Claims
Priority Applications (2)
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JP2006542946A JP4397936B2 (ja) | 2004-10-19 | 2005-10-14 | スイッチング電源装置およびそれを用いた電子機器 |
US11/664,963 US7851946B2 (en) | 2004-10-19 | 2005-10-14 | Switching power supply and electronic apparatus employing the same |
Applications Claiming Priority (2)
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JP2004-304807 | 2004-10-19 | ||
JP2004304807 | 2004-10-19 |
Publications (1)
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WO2006043479A1 true WO2006043479A1 (ja) | 2006-04-27 |
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PCT/JP2005/018961 WO2006043479A1 (ja) | 2004-10-19 | 2005-10-14 | スイッチング電源装置およびそれを用いた電子機器 |
Country Status (5)
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US (1) | US7851946B2 (ja) |
JP (1) | JP4397936B2 (ja) |
CN (1) | CN101036281A (ja) |
TW (1) | TW200627766A (ja) |
WO (1) | WO2006043479A1 (ja) |
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JP2014508500A (ja) * | 2011-03-14 | 2014-04-03 | クゥアルコム・インコーポレイテッド | 電荷ポンプのサージ電流低減[0001]本願は、2008年3月3日に提出された「SystemandMethodforReducingPowerConsumptionforAudioPlayback」と題された米国特許出願第12/041,414号と、2009年3月19日に提出された「DigitalFilteringinaClassDAmplifierSystemtoReduceNoiseFoldOver」と題された米国特許出願第12/407,238号に関連しており、それらの内容は、それらの全体において、ここにおける参照によってここによって組み込まれる。 |
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Also Published As
Publication number | Publication date |
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TW200627766A (en) | 2006-08-01 |
US20080088179A1 (en) | 2008-04-17 |
JP4397936B2 (ja) | 2010-01-13 |
CN101036281A (zh) | 2007-09-12 |
JPWO2006043479A1 (ja) | 2008-05-22 |
US7851946B2 (en) | 2010-12-14 |
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