CN1964170A - A charge pump - Google Patents

A charge pump Download PDF

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Publication number
CN1964170A
CN1964170A CN 200610145255 CN200610145255A CN1964170A CN 1964170 A CN1964170 A CN 1964170A CN 200610145255 CN200610145255 CN 200610145255 CN 200610145255 A CN200610145255 A CN 200610145255A CN 1964170 A CN1964170 A CN 1964170A
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coupled
level shift
shift circuit
output
switch
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CN100426642C (en
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陈忠君
刘世谦
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AU Optronics Corp
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AU Optronics Corp
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Abstract

The disclosed charge pump comprises: a level shift circuit to boost the first and second signal level for output, and a charge exchange control switch circuit to amplify an input voltage for output according to two control signals.

Description

Charge pump
Technical field
The present invention relates to a kind of charge pump (Charge Pump), relate in particular to a kind of scalable input voltage and the charge pump of corresponding regulated output voltage is provided.
Background technology
LCD (Liquid Crystal Display, LCD) be the frivolous flat display apparatus of a kind of external form (Flat Panel Display, FPD), it has low radiation, volume is little and advantage such as low power consuming, (Cathode Ray Tube CRT), thereby is widely used in notebook computer, personal digital assistant (Personal Digital Assistant to replace traditional cathode-ray tube display gradually, PDA), panel TV, or on the information products such as mobile phone.
Charge pump (Charge Pump) often is used as booster circuit (Booster) or voltage-multiplying circuit (Voltage Multiplier); regular meeting utilizes charge pump to improve the output voltage of low-voltage source (for example lithium battery) in LCD, with operating voltage that higher volt is provided to source electrode drive circuit (SourceDriver) and gate driver circuit drive circuits such as (Gate Driver).Generally speaking, the driving voltage polarity that is applied to liquid crystal cells must be reversed every a scheduled time, caused nonvolatil destruction to avoid liquid crystal material to produce polarization (Polarization).When the polarity of driving voltage began to reverse, at this moment therefore the current drain maximum of source electrode drive circuit and gate driver circuit when also being this charge pump load maximum.Can work effectively in order to ensure LCD, charge pump need provide enough loaded work piece scope and operating efficiency (boosting efficiency).
Please refer to Fig. 1, Fig. 1 is the schematic diagram of a charge pump 700 in the prior art.Charge pump 700 comprises a level shift (Level Shifter) circuit 27 and a charge-exchange control switch circuit 37.Level shift circuit 27 is made up of switch SW 1-SW4, and charge-exchange control switch circuit 37 is made up of switch SW 5-SW8.The input of charge pump 700 and the current potential of output are respectively by V INAnd V OUTExpression.Level shift circuit 27 can be respectively at its terminal A 1 and A2 receiving frequency signals CLK and XCK, improves the signal level of frequency signal CLK and XCK by switch SW 1-SW4, and exports control signal S1 and S2 after improving signal level respectively at its terminal B 1 and B2.Charge-exchange control switch circuit 37 comes control switch SW5-SW8 according to control signal S1 and S2, can be with input voltage V INBe amplified to required output voltage V OUT, to reach the effect of boosting.At deciding in the charge pump 700 of prior art, switch SW 1, SW2, SW5 and SW6 can be N type metal oxide semiconductor (N-TypeMetal-Oxide-Semiconductor, NMOS) transistor, and switch SW 3, SW4, SW7 and SW8 can be P-type mos (P-Type Metal-Oxide-Semiconductor, PMOS) transistor.In the charge pump 700 of prior art, full voltage frequency control signal S1 that level shift circuit 27 provides and S2 can activate charge conversion contactor 37 effectively, so charge pump 700 can provide output voltage V accurately OUTYet charge pump 700 can only be adapted at working under the less load variations, if use in the big design of load variations, the operating efficiency of charge pump 700 under low load will seriously decay, and also possibly can't operate as normal when load is excessive.
Please refer to Fig. 2, Fig. 2 is the schematic diagram of a capacitor push-pull (Push-Pull) formula charge pump 800 in the prior art.Capacitor push-pull formula charge pump 800 comprises a level shift circuit 28 and charge-exchange control switch circuit 38.Level shift circuit 28 is by switch SW 1, SW2 and capacitor C L S1, CL S2Form, and charge-exchange control switch circuit 36 is made up of switch SW 3-SW6.The input of capacitor push-pull formula charge pump 800 and the current potential of output are respectively by V INAnd V OUTRepresent.Level shift circuit 28 can be respectively at its terminal A 1 and A2 receiving frequency signals CLK and XCK, improve the signal level of frequency signal CLK and XCK by switch SW 1 and SW2, and export control signal S1 and S2 after improving signal level respectively at its terminal B 1 and B2.Charge-exchange control switch circuit 38 comes control switch SW3-SW6 according to control signal S1 and S2, can be with input voltage V INBe amplified to required output voltage V OUT, to reach the effect of boosting.In the capacitor push-pull formula charge pump 800 of prior art, switch SW 1, SW2, SW5 and SW6 can be the PMOS transistor, and switch SW 3 and SW4 can be nmos pass transistor.Capacitor push-pull formula charge pump 800 can be along with adjust frequency the automatically amplitude of control signal of electric charge load size, reduces the quantity of electric charge of conversion automatically by this mode, therefore can provide higher operating efficiency.Yet the frequency signal level of capacitor push-pull formula charge pump 800 can not arrive full voltage, output voltage V OUTCan be unstable, the difference along with load changes easily.
Summary of the invention
The invention provides a kind of charge pump, be used for amplifying an input voltage and the output voltage after its output output is amplified that its input receives, this charge pump comprises a level shift circuit, be used for receiving one first and one second frequency signal respectively at one first and one second input, improve the level of this first and second frequency signal, and export one first and one second corresponding control signal respectively with one second output one first; An and charge conversion circuit, its input and output are coupled in the input and the output of this charge pump respectively, be used for receiving this input voltage, improve the level of this input voltage, and produce this corresponding output voltage according to this first and second control signal.This level shift circuit comprises one first switch, and the control end of this first switch is coupled in the first input end of this level shift circuit, and second end of this first switch is coupled in first output of this level shift circuit; One second switch, the control end of this second switch are coupled to second input of this level shift circuit, and first end of this second switch is coupled to first end of this first switch, and second end of this second switch is coupled to second output of this level shift circuit; One the 3rd switch, the control end of the 3rd switch are coupled to second output of this level shift circuit, and first end of the 3rd switch is coupled to this electric charge delivery side of pump, and second end of the 3rd switch is coupled to first output of this level shift circuit; One the 4th switch, the control end of the 4th switch are coupled to first output of this level shift circuit, and first end of the 4th switch is coupled to this electric charge delivery side of pump, and second end of the 4th switch is coupled to second output of this level shift circuit; One first electric capacity is coupled between second output of the first input end of this level shift circuit and this level shift circuit; And one second electric capacity, be coupled between first output of second input of this level shift circuit and this level shift circuit.This charge conversion circuit comprises one the 5th switch, the control end of the 5th switch is coupled to first output of this level shift circuit, first end of the 5th switch is coupled to the first input end of this level shift circuit, and second end of the 5th switch is coupled to the input of this charge pump; One the 6th switch, the control end of the 6th switch are coupled to second output of this level shift circuit, and first end of the 6th switch is coupled to second input of this level shift circuit, and second end of the 6th switch is coupled to the input of this charge pump; One minion is closed, and the control end that this minion is closed is coupled to first output of this level shift circuit, and first end that this minion is closed is coupled to this electric charge delivery side of pump, and second end of this minion pass is coupled to the first input end of this level shift circuit; And one octavo close, the control end that this octavo is closed is coupled to second output of this level shift circuit, first end that this octavo is closed is coupled to second input of this level shift circuit, and second end that this octavo is closed is coupled to this electric charge delivery side of pump.
The present invention also provides a kind of charge pump, be used for amplifying an input voltage and the output voltage after its output output is amplified that its input receives, this charge pump comprises a level shift circuit, be used for receiving one first and one second frequency signal respectively at one first and one second input, improve the level of this first and second frequency signal, and export one first and one second corresponding control signal respectively with one second output in one first; And a charge conversion circuit, be used for receiving and improving the level of this input voltage, and produce this corresponding output voltage according to this first and second control signal.This level shift circuit comprises one first switch, the control end of this first switch is coupled to the first input end of this level shift circuit, first end of this first switch is coupled to first output of this level shift circuit, and second end of this first switch, is coupled to the input of this charge pump; One second switch, the control end of this second switch are coupled to second input of this level shift circuit, and first end of this second switch is coupled to second output of this level shift circuit, and second end of this second switch is coupled to the input of this charge pump; One the 3rd switch, a control end of the 3rd switch is coupled to second output of this level shift circuit, and first end of the 3rd switch is coupled to first output of this level shift circuit, and second end of the 3rd switch is coupled to this electric charge delivery side of pump; One the 4th switch, the control end of the 4th switch are coupled to first output of this level shift circuit, and first end of the 4th switch is coupled to second output of this level shift circuit, and second end of the 4th switch is coupled to this electric charge delivery side of pump; One first electric capacity is coupled between first output of second input of this level shift circuit and this level shift circuit; And one second electric capacity, be coupled between second output of the first input end of this level shift circuit and this level shift circuit.This charge conversion circuit comprises one the 5th switch, and the control end of the 5th switch is coupled to second output of this level shift circuit, and second end of the 5th switch is coupled to the first input end of this level shift circuit; One the 6th switch, the control end of the 6th switch is coupled to first output of this first level shift circuit, first end of the 6th switch is coupled to first end of the 5th switch, and second end of the 6th switch is coupled to second input of this level shift circuit; One minion is closed, and the control end that this minion is closed is coupled to first output of this level shift circuit, and first end that this minion is closed is coupled to second end of the 5th switch, and second end that this minion is closed is coupled to this electric charge delivery side of pump; And one octavo close, the control end that this octavo is closed is coupled to second output of this first level shift circuit, first end that this octavo is closed is coupled to second end of the 6th switch, and second end that this octavo is closed is coupled to this electric charge delivery side of pump.
Description of drawings
Fig. 1 is the schematic diagram of a charge pump in the prior art;
Fig. 2 is the schematic diagram of a capacitor push-pull formula charge pump in the prior art;
Fig. 3 is the schematic diagram of a positive polarity charge pump in the first embodiment of the invention;
Fig. 4 is the schematic diagram of a positive polarity charge pump in the second embodiment of the invention;
Fig. 5 is the schematic diagram of a negative polarity charge pump in the third embodiment of the invention;
Fig. 6 is the schematic diagram of a negative polarity charge pump in the fourth embodiment of the invention;
Fig. 7 is the schematic diagram of a combined type charge pump in the fifth embodiment of the invention;
Fig. 8 is the schematic diagram of a combined type charge pump in the sixth embodiment of the invention;
Fig. 9 is the output voltage of combined type charge pump and the simulate signal figure of operating efficiency;
Figure 10 is the output voltage of combined type charge pump and the simulate signal figure of operating efficiency.
Wherein, Reference numeral:
The 100-800 charge pump
The 21-28 level shift circuit
31-38 charge-exchange control switch circuit
The SW1-SW10 switch
C LS1, C LS2Electric capacity
Embodiment
Please refer to Fig. 3, Fig. 3 is the schematic diagram of a positive polarity charge pump 100 in the first embodiment of the invention.Positive polarity charge pump 100 comprises a level shift circuit 21 and a charge-exchange control switch circuit 31.Level shift circuit 21 is by switch SW 1-SW4 and capacitor C LS1, C LS2Form, and charge-exchange control switch circuit 31 is made up of switch SW 5-SW8.The input of positive polarity charge pump 100 and the current potential of output are respectively by V INAnd V OUTRepresent.In the positive polarity charge pump 100 of first embodiment of the invention, switch SW 1, SW2, SW5 and SW6 can be nmos pass transistor, and switch SW 3, SW4, SW7 and SW8 can be the PMOS transistor.
In level shift circuit 21, the grid of switch SW 1 and SW2 is respectively coupled to terminal A 1 and A2, and the drain electrode of switch SW 1 and SW2 is respectively coupled to terminal B 1 and B2, and the source electrode of switch SW 1 and SW2 couples each other.The grid of switch SW 3 and SW4 is respectively coupled to terminal B 2 and B1, and the drain electrode of switch SW 3 and SW4 is respectively coupled to terminal B 1 and B2, and the source electrode of switch SW 3 and SW4 all is coupled to the output of positive polarity charge pump 100.Simultaneously, capacitor C L S1Be coupled between terminal A 1 and the terminal B 2, and capacitor C L S2Be coupled between terminal A 2 and the terminal B 1.Level shift circuit 21 can be respectively at its terminal A 1 and A2 receiving frequency signals CLK and XCK, improves the signal level of frequency signal CLK and XCK by switch SW 1-SW4, and exports control signal S1 and S2 after improving signal level respectively at its terminal B 1 and B2.
In charge-exchange control switch circuit 31, the grid of switch SW 5 and SW6 is respectively coupled to terminal B 1 and B2, and the drain electrode of switch SW 5 and SW6 all is coupled to the input of charge pump 100.The grid of switch SW 7 and SW8 is respectively coupled to terminal B 1 and B2, the drain electrode of switch SW 7 and SW8 is respectively coupled to the source electrode of switch SW 5 and the output of positive polarity charge pump 100, and the source electrode of switch SW 7 and SW8 is respectively coupled to the output of positive polarity charge pump 100 and the source electrode of switch SW 6.Charge-exchange control switch circuit 31 can come control switch SW5-SW8 according to control signal S1 and S2, can be with input voltage V INBe amplified to required output voltage V OUT, to reach the effect of boosting.
Therefore the full voltage frequency control signal that the positive polarity charge pump 100 of first embodiment of the invention can provide can provide positive polarity output voltage V accurately OUTSimultaneously, the stabilization time of positive polarity charge pump 100 is very short, therefore can provide higher operating efficiency.
Please refer to Fig. 4, Fig. 4 is the schematic diagram of a positive polarity charge pump 200 in the second embodiment of the invention.Positive polarity charge pump 200 comprises a level shift circuit 22 and a charge-exchange control switch circuit 32.Level shift circuit 22 is made up of switch SW 1-SW4 and capacitor C LS1, CLS2, and charge-exchange control switch circuit 32 is made up of switch SW 5-SW10.The input of positive polarity charge pump 200 and the current potential of output are respectively by V INAnd V OUTRepresent.In the positive polarity charge pump 200 of second embodiment of the invention, switch SW 1, SW2, SW5 and SW6 can be nmos pass transistor, and switch SW 3, SW4, SW7-SW10 can be the PMOS transistor.
In level shift circuit 22, the grid of switch SW 1 and SW2 is respectively coupled to terminal A 1 and A2, and the drain electrode of switch SW 1 and SW2 is respectively coupled to terminal B 1 and B2, and the source electrode of switch SW 1 and SW2 couples each other.The grid of switch SW 3 and SW4 is respectively coupled to terminal B 2 and B1, and the drain electrode of switch SW 3 and SW4 is respectively coupled to terminal B 1 and B2, and the source electrode of switch SW 3 and SW4 all is coupled to the output of charge pump 200.Simultaneously, capacitor C L S1Be coupled between terminal A 1 and the terminal B 2, and capacitor C L S2Be coupled between terminal A 2 and the terminal B 1.Level shift circuit 22 can be respectively at its terminal A 1 and A2 receiving frequency signals CLK and XCK, improves the signal level of frequency signal CLK and XCK by switch SW 1-SW4, and exports control signal S1 and S2 after improving signal level respectively at its terminal B 1 and B2.
In charge-exchange control switch circuit 32, the grid of switch SW 5 and SW6 is respectively coupled to terminal B 1 and B2, and the drain electrode of switch SW 5 and SW6 is coupled to the input of positive polarity charge pump 200.The grid of switch SW 7 and SW8 is respectively coupled to terminal B 1 and B2, the drain electrode of switch SW 7 and SW8 is respectively coupled to the source electrode of switch SW 5 and the output of positive polarity charge pump 200, and the source electrode of switch SW 7 and SW8 is respectively coupled to the output of positive polarity charge pump 200 and the source electrode of switch SW 6.The grid of switch SW 9 and SW10 is respectively coupled to terminal B 2 and B1, and the drain electrode of switch SW 9 and SW10 is respectively coupled to the source electrode of switch SW 5 and the source electrode of switch SW 6, and the source electrode of switch SW 9 and SW10 is respectively coupled to the drain electrode of switch SW 5 and the drain electrode of switch SW 6.Charge-exchange control switch circuit 32 can come control switch SW5-SW10 according to control signal S1 and S2, can be with input voltage V INBe amplified to required output voltage V OUT, to reach the effect of boosting.
The positive polarity charge pump 200 of second embodiment of the invention can provide the full voltage frequency control signal, therefore can provide output voltage V accurately OUTSimultaneously, by (the Complimentary Metal Oxide Semiconductor of the complementary metal oxide semiconductors (CMOS) between switch SW 5, SW9 and SW6, the SW10, CMOS) transistor arrangement, can shorten the stabilization time of charge-exchange control switch circuit 32 more, so positive polarity charge pump 200 can be increased work efficiency further.
Please refer to Fig. 5, Fig. 5 is the schematic diagram of a negative polarity charge pump 300 in the third embodiment of the invention.Negative polarity charge pump 300 comprises a level shift circuit 23 and a charge-exchange control switch circuit 33.Level shift circuit 23 is by switch SW 1-SW4 and capacitor C LS1, CL S2Form, and charge-exchange control switch circuit 33 is made up of switch SW 5-SW8.The input of negative polarity charge pump 300 and the current potential of output are respectively by V INAnd V OUTRepresent.In the negative polarity charge pump 300 of third embodiment of the invention, switch SW 1 and SW2 can be the PMOS transistor, and switch SW 3 to SW8 can be nmos pass transistor.
In level shift circuit 23, the grid of switch SW 1 and SW2 is receiving frequency signals CLK and XCK respectively, and the drain electrode of switch SW 1 and SW2 is respectively coupled to terminal B 1 and B2, and the source electrode of switch SW 1 and SW2 then is coupled to the input of negative polarity charge pump 300.The grid of switch SW 3 and SW4 is respectively coupled to terminal B 2 and B1, and the drain electrode of switch SW 3 and SW4 is respectively coupled to terminal B 1 and B2, and the source electrode of switch SW 3 and SW4 all is coupled to the output of negative polarity charge pump 300.Simultaneously, frequency signal XCK is by capacitor C L S1 Reach terminal B 1, and frequency signal CLK is by capacitor C L S2Reach terminal B 2.But level shift circuit 23 receiving frequency signals CLK and XCK improve the signal level of frequency signal CLK and XCK by switch SW 1-SW4, and export control signal S1 and S2 after improving signal level respectively at its terminal B 1 and B2.
In charge-exchange control switch circuit 33, the grid of switch SW 5 and SW6 is respectively coupled to terminal B 2 and B1, and the drain electrode of switch SW 5 and SW6 then couples mutually.The grid of switch SW 7 and SW8 is respectively coupled to terminal B 1 and B2, and the drain electrode of switch SW 7 and SW8 is respectively coupled to the source electrode of switch SW 5 and the source electrode of switch SW 6, and the source electrode of switch SW 7 and SW8 all is coupled to the output of negative polarity charge pump 300.Charge-exchange control switch circuit 33 can come control switch SW5-SW8 according to control signal S1 and S2, can be with input voltage V INBe amplified to required negative polarity output voltage V OUT, to reach the effect of boosting.
The negative polarity charge pump 300 of third embodiment of the invention can provide the full voltage frequency control signal, therefore can provide negative polarity output voltage V accurately OUTSimultaneously, the stabilization time of negative polarity charge pump 300 is very short, therefore can provide higher operating efficiency.
Please refer to Fig. 6, Fig. 6 is the schematic diagram of a negative polarity charge pump 400 in the fourth embodiment of the invention.Negative polarity charge pump 400 comprises a level shift circuit 24 and a charge-exchange control switch circuit 34.Level shift circuit 24 is by switch SW 1-SW4 and capacitor C L S1, CL S2Form, and charge-exchange control switch circuit 34 is made up of switch SW 5-SW10.The input of negative polarity charge pump 400 and the current potential of output are respectively by V INAnd V OUTRepresent.In the negative polarity charge pump 400 of fourth embodiment of the invention, switch SW 1, SW2, SW9 and SW10 can be the PMOS transistor, and switch SW 3 to SW8 can be nmos pass transistor.
In level shift circuit 24, the grid of switch SW 1 and SW2 is receiving frequency signals CLK and XCK respectively, and the drain electrode of switch SW 1 and SW2 is respectively coupled to terminal B 1 and B2, and the source electrode of switch SW 1 and SW2 then is coupled to the input of negative polarity charge pump 400.The grid of switch SW 3 and SW4 is respectively coupled to terminal B 2 and B1, and the drain electrode of switch SW 3 and SW4 is respectively coupled to terminal B 1 and B2, and the source electrode of switch SW 3 and SW4 all is coupled to the output of negative polarity charge pump 400.Simultaneously, frequency signal XCK is by capacitor C L S1 Reach terminal B 1, and frequency signal CLK is by capacitor C L S2Reach terminal B 2.But level shift circuit 24 receiving frequency signals CLK and XCK improve the signal level of frequency signal CLK and XCK by switch SW 1-SW4, and export control signal S1 and S2 after improving signal level respectively at its terminal B 1 and B2.
In charge-exchange control switch circuit 34, the grid of switch SW 5 and SW6 is respectively coupled to terminal B 2 and B1, and the drain electrode of switch SW 5 and SW6 then couples mutually.The grid of switch SW 7 and SW8 is respectively coupled to terminal B 1 and B2, and the drain electrode of switch SW 7 and SW8 is respectively coupled to the source electrode of switch SW 5 and the source electrode of switch SW 6, and the source electrode of switch SW 7 and SW8 all is coupled to the output of charge pump 400.The grid of switch SW 9 and SW10 is respectively coupled to terminal B 1 and B2, and the drain electrode of switch SW 9 and SW10 is respectively coupled to the source electrode of switch SW 5 and switch SW 6, and the source electrode of switch SW 9 and SW10 is respectively coupled to the drain electrode of switch SW 5 and switch SW 6.Charge-exchange control switch circuit 34 can come control switch SW5-SW10 according to control signal S1 and S2, can be with input voltage V INBe amplified to required negative polarity output voltage V OUT, to reach the effect of boosting.
The negative polarity charge pump 400 of fourth embodiment of the invention can provide the full voltage frequency control signal, therefore can provide negative polarity output voltage V accurately OUTSimultaneously, by the CMOS (Complementary Metal Oxide Semiconductor) transistor structure between switch SW 5, SW9 and SW6, the SW10, can shorten the stabilization time of charge-exchange control switch circuit 34 more, so negative polarity charge pump 400 can be increased work efficiency further.
The present invention also can use a plurality of charge pumps that different loads working range and operating efficiency are provided.Please refer to Fig. 7, Fig. 7 is the schematic diagram of a combined type charge pump 500 in the fifth embodiment of the invention.Combined type charge pump 500 comprises a charge pump 200 and a plurality of charge pumps 100 (only showing two charge pumps 100 in Fig. 7).The structure of charge pump 200 and each charge pump 100 is respectively as Fig. 4 and shown in Figure 3, and the output current potential of combined type charge pump 500 is by V OUT5 Represent.Charge pump 200 is connected in parallel to each other with a plurality of charge pumps 100, each charge pump all can be respectively at its terminal A 1 and A2 receiving frequency signals CLK and XCK, improve the signal level of frequency signal CLK and XCK by switch SW 1-SW4, and export control signal S1 and S2 after improving signal level respectively at its terminal B 1 and B2, therefore input voltage VIN can be amplified to required output voltage V OUT5, to reach the effect of boosting.
Please refer to Fig. 8, Fig. 8 is the schematic diagram of a combined type charge pump 600 in the sixth embodiment of the invention.Charge pump 600 comprises a charge pump 200 and a plurality of charge pumps 800 (only showing two charge pumps 800 in Fig. 8).The structure of charge pump 200 and each charge pump 800 is respectively as Fig. 4 and shown in Figure 2, and the current potential of combined type charge pump 600 outputs is by V OUT6 Represent.Charge pump 200 is connected in parallel to each other with a plurality of charge pumps 800, each charge pump all can be respectively at its terminal A 1 and A2 receiving frequency signals CLK and XCK, improve the signal level of frequency signal CLK and XCK by switch SW 1-SW4, and export control signal S1 and S2 after improving signal level respectively at its terminal B 1 and B2, therefore can be with input voltage V INBe amplified to required output voltage V OUT6, to reach the effect of boosting.
Please refer to Fig. 9, Fig. 9 is the output voltage of combined type charge pump 500 and 600 and the simulate signal figure of operating efficiency.In Fig. 9, the left side longitudinal axis is represented output voltage, and unit is a volt; The right side longitudinal axis is represented operating efficiency, and unit is a percentage; Transverse axis is represented output loading, and unit is K ohm; Curve V3 and curve V4 represent the output voltage V of combined type charge pump 500 and 600 respectively OUT5And V OUT6Curve EFF5 and curve EFF6 represent the operating efficiency of combined type charge pump 500 and 600 respectively.Therefore, the combined type charge pump 500 and 600 among the present invention the 5th and the 6th embodiment can provide different loads working range and operating efficiency.
Simultaneously, the present invention also can pass through capacitor C L S1And CL S2Adjust the output voltage and the operating efficiency of charge pump.Please refer to Figure 10, Figure 10 is the output voltage of combined type charge pump 600 and the simulate signal figure of operating efficiency.In Figure 10, the left side longitudinal axis is represented output voltage, and unit is a volt; The right side longitudinal axis is represented operating efficiency, and unit is a percentage; Transverse axis is represented output loading, and unit is k ohm; Curve V6_5PF and curve EFF6_5PF represent respectively as capacitor C L S1And CL S2Value be 5 pico farads (pico-farad, the output voltage of combined type charge pump 600 and operating efficiencies in the time of pF); Curve V6_10PF and curve EFF6_10PF represent respectively as capacitor C L S1And CL S2The output voltage and the operating efficiency of value combined type charge pump 600 when being 10 pico farads.
The level shift circuit of charge pump of the present invention can be stablized apace, and the grid control signal that full voltage level can be provided is to the charge-exchange switching circuit, therefore can significantly reduce the impedance of transistor switch, obtains more efficient and stable voltage and exports.In addition, composite type electric charge pump of the present invention can further shorten the stabilization time (Settling Time) of circuit and the level of regulated output voltage, can flexibly provide different loads working range and two to make efficient.The present invention can provide the power supply supply of fast and stable, can be applicable to devices such as mobile phone, digital camera and personal digital assistant.
Below only show preferred embodiment of the present invention.Obviously under the situation that does not break away from the spirit and scope of the present invention, those of ordinary skill in the art can make various improvement and variation to the present invention.Therefore, the invention is intended to cover improvement and variation within all scopes that fall into claims and equivalent thereof.

Claims (10)

1. a charge pump is used for amplifying an input voltage and the output voltage after its output output is amplified that its input receives, and it is characterized in that this charge pump comprises:
One first level shift circuit, be used for receiving one first and one second frequency signal respectively at one first and one second input, improve the level of this first and second frequency signal, and export corresponding one first and one second control signal respectively at one first and one second output, this first level shift circuit comprises:
One first switch, it comprises:
One control end is coupled to the first input end of this first level shift circuit;
One first end; And
One second end is coupled to first output of this first level shift circuit;
One second switch, it comprises:
One control end is coupled to second input of this first level shift circuit;
One first end is coupled to first end of this first switch; And
One second end is coupled to second output of this first level shift circuit;
One the 3rd switch, it comprises:
One control end is coupled to second output of this first level shift circuit;
One first end is coupled to the output of this charge pump; And
One second end is coupled to first output of this first level shift circuit;
One the 4th switch, it comprises:
One control end is coupled to first output of this first level shift circuit;
One first end is coupled to this electric charge delivery side of pump; And
One second end is coupled to second output of this first level shift circuit;
One first electric capacity is coupled between second output of the first input end of this first level shift circuit and this first level shift circuit; And
One second electric capacity is coupled between first output of second input of this first level shift circuit and this first level shift circuit; And
One first charge conversion circuit, its input and output are respectively coupled to the input and the output of this charge pump, be used for receiving this input voltage, improve the level of this input voltage according to this first and second control signal, and produce this corresponding output voltage, this first charge conversion circuit comprises:
One the 5th switch, it comprises:
One control end is coupled to first output of this first level shift circuit;
One first end is coupled to the first input end of this first level shift circuit; And
One second end is coupled to the input of this charge pump;
One the 6th switch, it comprises:
One control end is coupled to second output of this first level shift circuit;
One first end is coupled to second input of this first level shift circuit; And
One second end is coupled to the input of this charge pump;
One minion is closed, and it comprises:
One control end is coupled to first output of this first level shift circuit;
One first end is coupled to this electric charge delivery side of pump; And
One second end is coupled to the first input end of this first level shift circuit; And
One octavo is closed, and it comprises:
One control end is coupled to second output of this first level shift circuit;
One first end is coupled to second input of this first level shift circuit; And
One second end is coupled to this electric charge delivery side of pump.
2. charge pump according to claim 1 is characterized in that, also comprises:
One the 9th switch, it comprises:
One control end is coupled to second output of this first level shift circuit;
One first end is coupled to second end of the 5th switch; And
One second end is coupled to first end of the 5th switch; And
The tenth switch, it comprises:
One control end is coupled to first output of this first level shift circuit;
One first end is coupled to second end of the 6th switch; And
One second end is coupled to first end of the 6th switch.
3. charge pump according to claim 1 is characterized in that, also comprises:
One second level shift circuit, be used for receiving this first and second frequency signal respectively at one first and one second input, improve the level of this first and second frequency signal, and export one the 3rd and one the 4th corresponding control signal respectively with one second output one first, this second level shift circuit comprises:
The 11 switch, it comprises:
One control end is coupled to the first input end of this second level shift circuit;
One first end; And
One second end is coupled to first output of this second level shift circuit;
One twelvemo is closed, and it comprises:
One control end is coupled to second input of this second level shift circuit;
One first end is coupled to first end of the 11 switch; And
One second end is coupled to second output of this second level shift circuit;
The 13 switch, it comprises:
One control end is coupled to second output of this second level shift circuit;
One first end is coupled to this electric charge delivery side of pump; And
One second end is coupled to first output of this second level shift circuit;
The 14 switch, it comprises:
One control end is coupled to first output of this second level shift circuit;
One first end is coupled to this electric charge delivery side of pump; And
One second end is coupled to second output of this second level shift circuit;
One the 3rd electric capacity is coupled between second output of the first input end of this second level shift circuit and this second level shift circuit; And
One the 4th electric capacity is coupled between first output of second input of this second level shift circuit and this second level shift circuit; And
One second charge conversion circuit, its input and output are respectively coupled to the input and the output of this charge pump, be used for receiving this input voltage, improve the level of this input voltage according to the 3rd and the 4th control signal, and produce this corresponding output voltage, this second charge conversion circuit comprises:
The 15 switch, it comprises:
One control end is coupled to first output of this second level shift circuit;
One first end is coupled to the first input end of this second level shift circuit; And
One second end is coupled to the input of this charge pump;
One sixteenmo closes, and it comprises:
One control end is coupled to second output of this second level shift circuit;
One first end is coupled to second input of this second level shift circuit; And
One second end is coupled to the input of this charge pump;
The tenth minion is closed, and it comprises:
One control end is coupled to first output of this second level shift circuit;
One first end is coupled to this electric charge delivery side of pump; And
One second end is coupled to the first input end of this second level shift circuit; And
One eighteenmo closes, and it comprises:
One control end is coupled to second output of this second level shift circuit;
One first end is coupled to second input of this second level shift circuit; And
One second end is coupled to this electric charge delivery side of pump.
4. charge pump according to claim 3 is characterized in that, also comprises:
The 19 switch, it comprises:
One control end is coupled to second output of this second level shift circuit;
One first end is coupled to second end of the 15 switch; And
One second end is coupled to first end of the 15 switch; And
One the 20 switch, it comprises:
One control end is coupled to first output of this second level shift circuit;
One first end is coupled to second end that this sixteenmo closes; And
One second end is coupled to first end that this sixteenmo closes.
5. charge pump according to claim 1 is characterized in that, also comprises:
One second level shift circuit, be used for receiving this first and second frequency signal respectively at one first and one second input, improve the level of this first and second frequency signal, and export one the 3rd and one the 4th corresponding control signal respectively with one second output one first, this second level shift circuit comprises:
One the 3rd electric capacity, it comprises:
One first end is coupled to the first input end of this second level shift circuit; And
One second end is coupled to first output of this second level shift circuit;
One the 4th electric capacity, it comprises:
One first end is coupled to second input of this second level shift circuit; And
One second end is coupled to second output of this second level shift circuit;
The 11 switch, it comprises:
One control end is coupled to second output of this second level shift circuit;
One first end is coupled to this electric charge delivery side of pump; And
One second end is coupled to second end of the 3rd electric capacity; And
One twelvemo is closed, and it comprises:
One control end is coupled to first output of this second level shift circuit;
One first end is coupled to this electric charge delivery side of pump; And
One second end is coupled to second end of the 4th electric capacity; And
One second charge conversion circuit, its input and output are respectively coupled to the input and the output of this charge pump, be used for receiving this input voltage, and improve the level of this input voltage according to the 3rd and the 4th control signal, produce corresponding this output voltage, this second charge conversion circuit comprises:
The 13 switch, it comprises:
One control end is coupled to first output of this second level shift circuit;
One first end is coupled to the first input end of this second level shift circuit; And
One second end is coupled to the input of this charge pump;
The 14 switch, it comprises:
One control end is coupled to second output of this second level shift circuit;
One first end is coupled to second input of this second level shift circuit; And
One second end is coupled to the input of this charge pump;
The 15 switch, it comprises:
One control end is coupled to first output of this second level shift circuit;
One first end is coupled to this electric charge delivery side of pump; And
One second end is coupled to the first input end of this second level shift circuit; And
One sixteenmo closes, and it comprises:
One control end is coupled to second output of this second level shift circuit;
One first end is coupled to second input of this second level shift circuit; And
One second end is coupled to this electric charge delivery side of pump.
6. charge pump according to claim 5 is characterized in that, also comprises:
The tenth minion is closed, and it comprises:
One control end is coupled to second output of this second level shift circuit;
One first end is coupled to second end of the 13 switch; And
One second end is coupled to first end of the 13 switch; And
One eighteenmo closes, and it comprises:
One control end is coupled to first output of this second level shift circuit;
One first end is coupled to second end of the 14 switch; And
One second end is coupled to first end of the 14 switch.
7. a charge pump is used for amplifying an input voltage and the output voltage after its output output is amplified that its input receives, and it is characterized in that this charge pump comprises:
One first level shift circuit, be used for receiving one first and one second frequency signal respectively at one first and one second input, improve the level of this first and second frequency signal, and export one first and one second corresponding control signal respectively with one second output one first, this first level shift circuit comprises:
One first switch, it comprises:
One control end is coupled to the first input end of this first level shift circuit;
One first end is coupled to first output of this first level shift circuit; And
One second end is coupled to the input of this charge pump;
One second switch, it comprises:
One control end is coupled to second input of this first level shift circuit;
One first end is coupled to second output of this first level shift circuit; And
One second end is coupled to the input of this charge pump;
One the 3rd switch, it comprises:
One control end is coupled to second output of this first level shift circuit;
One first end is coupled to first output of this first level shift circuit; And
One second end is coupled to this electric charge delivery side of pump;
One the 4th switch, it comprises:
One control end is coupled to first output of this first level shift circuit;
One first end is coupled to second output of this first level shift circuit; And
One second end is coupled to this electric charge delivery side of pump;
One first electric capacity is coupled between first output of second input of this first level shift circuit and this first level shift circuit; And
One second electric capacity is coupled between second output of the first input end of this first level shift circuit and this first level shift circuit; And
One first charge conversion circuit is used for receiving and improving the level of this input voltage according to this first and second control signal, and produces this corresponding output voltage, and this first charge conversion circuit comprises:
One the 5th switch, it comprises:
One control end is coupled to second output of this first level shift circuit;
One first end; And
One second end is coupled to the first input end of this first level shift circuit;
One the 6th switch, it comprises:
One control end is coupled to first output of this first level shift circuit;
One first end is coupled to first end of the 5th switch; And
One second end is coupled to second input of this first level shift circuit;
One minion is closed, and it comprises:
One control end is coupled to first output of this first level shift circuit;
One first end is coupled to second end of the 5th switch; And
One second end is coupled to this electric charge delivery side of pump; And
One octavo is closed, and it comprises:
One control end is coupled to second output of this first level shift circuit;
One first end is coupled to second end of the 6th switch; And
One second end is coupled to this electric charge delivery side of pump.
8. charge pump according to claim 7 is characterized in that, also comprises:
One the 9th switch, it comprises:
One control end is coupled to first output of this first level shift circuit;
One first end is coupled to second end of the 5th switch; And
One second end is coupled to first end of the 5th switch; And
The tenth switch, it comprises:
One control end is coupled to second output of this first level shift circuit;
One first end is coupled to second end of the 6th switch; And
One second end is coupled to first end of the 6th switch.
9. charge pump according to claim 7 is characterized in that, also comprises:
One second level shift circuit, be used for receiving this first and second frequency signal respectively at one first and one second input, improve the level of this first and second frequency signal, and export one the 3rd and one the 4th corresponding control signal respectively with one second output one first, this second level shift circuit comprises:
The 11 switch comprises:
One control end is coupled to the first input end of this second level shift circuit;
One first end is coupled to first output of this second level shift circuit; And
One second end is coupled to the input of this charge pump;
One twelvemo is closed, and it comprises:
One control end is coupled to second input of this second level shift circuit;
One first end is coupled to second output of this second level shift circuit; And
One second end is coupled to the input of this charge pump;
The 13 switch, it comprises:
One control end is coupled to second output of this second level shift circuit;
One first end is coupled to first output of this second level shift circuit; And
One second end is coupled to this electric charge delivery side of pump;
The 14 switch, it comprises:
One control end is coupled to first output of this second level shift circuit;
One first end is coupled to second output of this second level shift circuit; And
One second end is coupled to this electric charge delivery side of pump;
One the 3rd electric capacity is coupled between first output of second input of this second level shift circuit and this second level shift circuit; And
One the 4th electric capacity is coupled between second output of the first input end of this second level shift circuit and this second level shift circuit; And
One second charge conversion circuit is used for receiving and improves the level of this input voltage according to the 3rd and the 4th control signal, and produces corresponding this output voltage, and this second charge conversion circuit comprises:
The 15 switch, it comprises:
One control end is coupled to second output of this second level shift circuit;
One first end; And
One second end is coupled to the first input end of this second level shift circuit;
One sixteenmo closes, and it comprises:
One control end is coupled to first output of this second level shift circuit;
One first end is coupled to first end of the 15 switch; And
One second end is coupled to second input of this second level shift circuit;
The tenth minion is closed, and it comprises:
One control end is coupled to first output of this second level shift circuit;
One first end is coupled to second end of the 15 switch; And
One second end is coupled to this electric charge delivery side of pump; And
One eighteenmo closes, and it comprises:
One control end is coupled to second output of this second level shift circuit;
One first end is coupled to second end that this sixteenmo closes; And
One second end is coupled to this electric charge delivery side of pump.
10. charge pump according to claim 9 is characterized in that, also comprises:
The 19 switch, it comprises:
One control end is coupled to first output of this second level shift circuit;
One first end is coupled to second end of the 15 switch; And
One second end is coupled to first end of the 15 switch; And
One the 20 switch, it comprises:
One control end is coupled to second output of this second level shift circuit;
One first end is coupled to second end that this sixteenmo closes; And
One second end is coupled to first end that this sixteenmo closes.
CNB2006101452552A 2006-11-24 2006-11-24 A charge pump Active CN100426642C (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106208681A (en) * 2016-07-19 2016-12-07 天津大学 Low-voltage low ripple multi stage charge pump

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3548161B2 (en) * 2001-02-01 2004-07-28 三洋電機株式会社 Charge pump circuit
JP4042627B2 (en) * 2003-05-20 2008-02-06 ソニー株式会社 Power supply voltage conversion circuit, control method therefor, display device and portable terminal
CN100409549C (en) * 2004-02-26 2008-08-06 圆创科技股份有限公司 High performance charge pump of preventing countercurrent

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106208681A (en) * 2016-07-19 2016-12-07 天津大学 Low-voltage low ripple multi stage charge pump
CN106208681B (en) * 2016-07-19 2019-05-10 天津大学 Low-voltage low ripple multi stage charge pump

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