CN113489302A - Soft start circuit of charge pump - Google Patents
Soft start circuit of charge pump Download PDFInfo
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- CN113489302A CN113489302A CN202110911775.4A CN202110911775A CN113489302A CN 113489302 A CN113489302 A CN 113489302A CN 202110911775 A CN202110911775 A CN 202110911775A CN 113489302 A CN113489302 A CN 113489302A
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- 230000000295 complement effect Effects 0.000 claims abstract description 23
- 230000010355 oscillation Effects 0.000 abstract description 11
- 238000010586 diagram Methods 0.000 description 5
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- 230000010354 integration Effects 0.000 description 2
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- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
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- 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
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- Engineering & Computer Science (AREA)
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- Dc-Dc Converters (AREA)
Abstract
The invention relates to the technical field of integrated circuits, and particularly discloses a soft start circuit of a charge pump, which comprises a soft start circuit and a first-order Dickson charge pump circuit, wherein the soft start circuit is connected with the first-order Dickson charge pump circuit, the soft start circuit comprises a first operational amplifier OP1, a second operational amplifier OP2, a first resistor R1, a second resistor R2, a third resistor R11, a first MOS transistor M1, a second MOS transistor M2, a third MOS transistor M3, a fourth MOS transistor M4, a first diode D0, a first capacitor C1, a fourth capacitor C11, a first complementary switch S1 and a second complementary switch S2, and the first-order Dickson charge pump circuit comprises an oscillation circuit, a second diode D1, a third diode D2, a second capacitor C2, a third capacitor C3 and a load resistor RL. The soft start circuit of the charge pump is easy to control and integrate by a chip, and different soft start time of the charge pump can be configured by configuring the resistance value of a single resistor or the capacitance value of a capacitor at the periphery after the chip is integrated, so that the soft start circuit of the charge pump is convenient to be compatible with different application requirements.
Description
Technical Field
The present invention relates to the field of integrated circuit technologies, and in particular, to a soft start circuit of a charge pump.
Background
A charge pump circuit is a common voltage boosting circuit in the electronic field, an output of the charge pump circuit is often used as a power supply voltage, in order to protect a load device, it is generally undesirable that the power supply voltage has an excessively high peak or a large voltage swing rate at the time of starting, and a soft start circuit is required to slowly increase the power supply voltage at the time of starting.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides the soft start circuit of the charge pump, which is easy to control and integrate a chip, and different soft start time of the charge pump can be configured by configuring the resistance value of a single resistor or the capacitance value of a capacitor at the periphery after the chip is integrated, so that the soft start circuit is convenient to be compatible with different application requirements.
As a first aspect of the present invention, there is provided a soft-start circuit of a charge pump, including a soft-start circuit and a first-order Dickson charge pump circuit, the soft-start circuit being connected to the first-order Dickson charge pump circuit, the soft-start circuit including a first operational amplifier OP1, a second operational amplifier OP2, a first resistor R1, a second resistor R2, a third resistor R11, a first MOS transistor M1, a second MOS transistor M2, a third MOS transistor M3, a fourth MOS transistor M4, a first diode D0, a first capacitor C1, a fourth capacitor C11, a first complementary switch S1, and a second complementary switch S2, the first-order Dickson charge pump circuit including an oscillation circuit, a second diode D1, a third diode D2, a second capacitor C2, a third capacitor C3, and a load resistor RL,
a reference voltage V2 is connected to the positive input terminal of the second operational amplifier OP2, the output terminal of the second operational amplifier OP2 is connected to the gate of the second MOS tube M2, the source of the second MOS tube M2 is connected to the negative input terminal of the second operational amplifier OP2 and one end of the third resistor R11, the other end of the third resistor R11 is connected to the power ground GND, the source of the third MOS tube M3 and the source of the fourth MOS tube M4 are connected together and connected to the power voltage VDD, the gate of the third MOS tube M3 and the gate of the fourth MOS tube M4 are connected together and connected to the drain of the third MOS tube M3 and the drain of the second MOS tube M2, the drain of the fourth MOS tube M4 is connected to one end of the first complementary switch S1, the first negative input terminal of the first operational amplifier OP1 is connected to the reference voltage V1, and the second input terminal is connected to the anode of the first complementary switch S36D 0 and the other terminal of the first complementary switch S1, a cathode of the first diode D0 is respectively connected to one end of the second complementary switch S2 and one end of the capacitor C11, the other end of the second complementary switch S2 and the other end of the capacitor C11 are connected together and are also connected to a power ground GND, an output end of the first operational amplifier OP1 is connected to a gate of the first MOS transistor M1, a source of the first MOS transistor M1 is connected to the power voltage VDD, a drain of the first MOS transistor M1 is respectively connected to an output end of the soft start circuit, one end of the first resistor R1 and one end of the first capacitor C1, the other end of the first resistor R1 is respectively connected to a positive input end of the first operational amplifier OP1 and one end of the second resistor R2, and the other end of the second resistor R2 and the other end of the first capacitor C1 are connected together and are also connected to the power ground GND;
the output end of the soft start circuit is connected to the input end of the oscillation circuit, the first power end and the second power end of the oscillation circuit are correspondingly connected to the power supply voltage VDD and the power supply ground GND respectively, the output end of the oscillation circuit is connected to one end of the second capacitor C2, the other end of the second capacitor C2 is connected to the cathode of the second diode D1 and the anode of the third diode D2 respectively, the anode of the second diode D1 is connected to the power supply voltage VDD, the cathode of the third diode D2 is connected to one end of the third capacitor C3, one end of the load resistor RL and the output voltage Vout of the soft start circuit of the charge pump respectively, and the other end of the third capacitor C3 and the other end of the load resistor RL are connected together and are connected to the power supply ground GND simultaneously.
Furthermore, the first MOS transistor M1, the third MOS transistor M3, and the fourth MOS transistor M4 are all PMOS transistors.
Further, the second MOS transistor M2 is an NMOS transistor.
Further, the first diode D0 is a diode for bias.
The soft start circuit of the charge pump provided by the invention has the following advantages: the control is easy, the chip integration is easy, different soft start time of the charge pump can be configured by configuring the resistance value of a single resistor or the capacitance value of a capacitor at the periphery after the chip integration, and the compatibility with different application requirements is facilitated.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.
Fig. 1 is a block diagram of a soft start circuit of a charge pump according to the present invention.
Fig. 2 is an equivalent circuit diagram of the soft start circuit provided by the present invention.
Fig. 3 is an equivalent circuit diagram of a first-order Dickson charge pump circuit according to the present invention.
Fig. 4 is a timing chart of the voltage at the second negative input terminal 133 of the first operational amplifier OP1 according to the present invention.
Fig. 5 is a timing diagram of the voltage at the output 135 of the soft start circuit according to the present invention.
Fig. 6 is a timing diagram of the output voltage Vout of the soft start circuit of the charge pump according to the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the soft start circuit of the charge pump according to the present invention with reference to the accompanying drawings and preferred embodiments shows the following detailed descriptions of the specific implementation, structure, features and effects thereof. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
In the present embodiment, there is provided a soft-start circuit of a charge pump, as shown in fig. 1 to 3, the soft-start circuit of the charge pump includes a soft-start circuit and a first-order Dickson charge pump circuit, the soft-start circuit is connected to the first-order Dickson charge pump circuit, the soft-start circuit includes a first operational amplifier OP1, a second operational amplifier OP2, a first resistor R1, a second resistor R2, a third resistor R11, a first MOS transistor M1, a second MOS transistor M2, a third MOS transistor M3, a fourth MOS transistor M4, a first diode D0, a first capacitor C1, a fourth capacitor C11, a first complementary switch S1, and a second complementary switch S2, the first-order Dickson charge pump circuit includes an oscillation circuit, a second diode D1, a third diode D2, a second capacitor C2, a third capacitor C3, and a load resistor RL,
a reference voltage V2 is connected to the positive input terminal 138 of the second operational amplifier OP2, the output terminal 132 of the second operational amplifier OP2 is connected to the gate of the second MOS tube M2, the source of the second MOS tube M2 is connected to the negative input terminal 131 of the second operational amplifier OP2 and one end of the third resistor R11, the other end of the third resistor R11 is connected to the power ground GND, the source of the third MOS tube M3 and the source of the fourth MOS tube M4 are connected together and connected to the power voltage VDD, the gate of the third MOS tube M3 and the gate of the fourth MOS tube M4 are connected together and connected to the drains of the third MOS tube M3 and the second MOS tube M2, the drain of the fourth MOS tube M4 is connected to one end of the first complementary switch S1, the first negative input terminal 137 of the first operational amplifier OP1 is connected to the reference voltage V1, and the second negative input terminal of the first complementary switch S0 and the anode of the first complementary switch S1, a cathode of the first diode D0 is respectively connected to one end of the second complementary switch S2 and one end of a capacitor C11, the other end of the second complementary switch S2 and the other end of the capacitor C11 are connected together and are also connected to a power ground GND, an output end 136 of the first operational amplifier OP1 is connected to a gate of the first MOS transistor M1, a source of the first MOS transistor M1 is connected to the power voltage VDD, a drain of the first MOS transistor M1 is respectively connected to the output end 135 of the soft start circuit, one end of a first resistor R1 and one end of a first capacitor C1, the other end of the first resistor R1 is respectively connected to the positive input end 134 of the first operational amplifier OP1 and one end of the second resistor R2, and the other end of the second resistor R2 and the other end of the first capacitor C1 are connected together and are also connected to the power ground GND;
the output end 135 of the soft start circuit is connected to the input end of the oscillation circuit, the first power end 143 and the second power end 144 of the oscillation circuit are correspondingly connected to the power voltage VDD and the power ground GND, respectively, the output end 142 of the oscillation circuit is connected to one end of the second capacitor C2, the other end of the second capacitor C2 is connected to the cathode of the second diode D1 and the anode of the third diode D2, the anode of the second diode D1 is connected to the power voltage VDD, the cathode of the third diode D2 is connected to one end of the third capacitor C3, one end of the load resistor RL and the output voltage Vout of the soft start circuit of the charge pump, respectively, and the other end of the third capacitor C3 and the other end of the load resistor RL are connected together and also connected to the power ground GND.
Preferably, the first MOS transistor M1, the third MOS transistor M3, and the fourth MOS transistor M4 are all PMOS transistors.
Preferably, the second MOS transistor M2 is an NMOS transistor.
Preferably, the first diode D0 is a biasing diode.
Specifically, the third resistor R11 is an external resistor.
As shown in fig. 1-6, the soft start circuit of the charge pump provided by the present invention is designed by using the principle that the resistance value of the setting resistor R11 generates an adjustable constant current source, the constant current source charges the capacitor C11, and the voltage of the capacitor C11 increases linearly. The specific working principle is as follows:
the reference voltage V2, the second operational amplifier OP2, the NMOS transistor M2 and the resistor R11 form a controllable constant current source, the controllable constant current source controlled by the resistor R11 generates a controllable constant current I10 ═ V2/R11, the PMOS transistor M3 and the PMOS transistor M4 form a current mirror, so that the controllable constant current I11 ═ I10, when the switch S1 is closed and the switch S2 is opened, the controllable constant current I11 charges the capacitor C11, the voltage value of the capacitor C11 increases linearly with time, so that the voltage value V133 at the input end 133 of the first operational amplifier OP 11 is as shown in fig. 4, the voltage value V133 increases linearly from the forward voltage drop 11 of the diode D11 to VDD, in the process, the rising time of the voltage V133 is T133, the voltage value T11 ═ C11 (VDD-Vd 11)/V11, where V11, VDD is a fixed resistance value of the capacitor C11 and the resistance value of the resistor R11;
when the voltage V133 at the 133 port is smaller than the reference voltage V1, according to the principle of "virtual short" of the operational amplifier, the voltage V133 at the 133 port is equal to the voltage V134 at the 134 port, so that the voltage V135 at the output terminal 135 is equal to V133 ═ R1+ R2)/R2; when the voltage value V133 at the 133 port is greater than the reference voltage V1, and the voltage value V134 at the 134 port is always equal to the reference voltage V1, then V135 is equal to V1 (R1+ R2)/R2, as shown in fig. 5, the voltage value V135 linearly increases from Vd0 (R1+ R2)/R2 to V1 (R1+ R2)/R2, in this process, the time when the voltage V135 linearly rises is the soft start time TSS, and the time when the voltage V135 linearly rises is equal to (C11 (V1-Vd0) R11)/V2, where V1, V2, and Vd0 are fixed voltage values, so the value of the soft start time TSS is determined by the resistance value of the resistor R11 and the capacitance value of the capacitor C11;
the output end 135 of the soft start circuit is used as the input end of an oscillating circuit (OSC), the voltage value V135 at the port 135 is used as the oscillating reference voltage value of the oscillating circuit (OSC), the charging and discharging time of a capacitor C2 and the voltage value at two ends of a capacitor C2 are controlled, the oscillating circuit, the capacitor C2, a diode D1, a diode D2 and a capacitor C3 form a first-order Dickson charge pump circuit, and therefore the output voltage of the charge pump circuit is the output voltage of the first-order Dickson charge pump circuit principle
(Vd is the forward voltage drop of diodes D1 and D2, FOSC is the oscillation frequency of the oscillation circuit (OSC), RL is the charge pump circuit load resistance), Vout voltage is derived from
Linear increase to
The Vout output waveform is shown in fig. 6.
The soft start circuit of the charge pump is easy to control and integrate by a chip, and different soft start time of the charge pump can be configured by configuring the resistance value of a single resistor or the capacitance value of a capacitor at the periphery after the chip is integrated, so that the soft start circuit of the charge pump is convenient to be compatible with different application requirements.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (4)
1. A soft start circuit of a charge pump is characterized by comprising a soft start circuit and a first-order Dickson charge pump circuit, wherein the soft start circuit is connected with the first-order Dickson charge pump circuit and comprises a first operational amplifier OP1, a second operational amplifier OP2, a first resistor R1, a second resistor R2, a third resistor R11, a first MOS tube M1, a second MOS tube M2, a third MOS tube M3, a fourth MOS tube M4, a first diode D0, a first capacitor C1, a fourth capacitor C11, a first complementary switch S1 and a second complementary switch S2, the first-order Dickson charge pump circuit comprises an oscillating circuit, a second diode D1, a third diode D2, a second capacitor C2, a third capacitor C32 and a load resistor RL, wherein 3,
a reference voltage V2 is connected to the positive input terminal (138) of the second operational amplifier OP2, an output terminal (132) of the second operational amplifier OP2 is connected to the gate of the second MOS transistor M2, the source of the second MOS transistor M2 is connected to the negative input terminal (131) of the second operational amplifier OP2 and one end of the third resistor R11, the other end of the third resistor R11 is connected to the power ground GND, the source of the third MOS transistor M3 and the source of the fourth MOS transistor M4 are connected together and connected to the power voltage VDD, the gate of the third MOS transistor M3 and the gate of the fourth MOS transistor M4 are connected together and connected to the third MOS transistor M3 and the drain of the second MOS transistor M2, the drain of the fourth MOS transistor M4 is connected to one end of the first complementary switch S1, the first negative input terminal (137) of the first operational amplifier OP 6 is connected to the V1, and the first negative input terminal (133) of the first complementary switch S1 and the anode of the first complementary switch S1 A cathode of the first diode D0 is respectively connected to one end of the second complementary switch S2 and one end of a capacitor C11, the other end of the second complementary switch S2 and the other end of the capacitor C11 are connected together and are also connected to a power ground GND, an output end (136) of the first operational amplifier OP1 is connected to a gate of the first MOS transistor M1, a source of the first MOS transistor M1 is connected to the power voltage VDD, a drain of the first MOS transistor M1 is respectively connected to an output end (135) of the soft start circuit, one end of a first resistor R1 and one end of a first capacitor C1, the other end of the first resistor R1 is respectively connected to a positive input end (134) of the first operational amplifier OP1 and one end of the second resistor R2, the other end of the second resistor R2 and the other end of the first capacitor C1 are connected together and are also connected to the power ground GND;
an output end (135) of the soft start circuit is connected to an input end of the oscillating circuit, a first power end (143) and a second power end (144) of the oscillating circuit are correspondingly connected to the power supply voltage VDD and the power supply ground GND respectively, an output end (142) of the oscillating circuit is connected to one end of a second capacitor C2, the other end of the second capacitor C2 is connected to a cathode of the second diode D1 and an anode of a third diode D2 respectively, an anode of the second diode D1 is connected to the power supply voltage VDD, a cathode of the third diode D2 is connected to one end of a third capacitor C3, one end of a load resistor RL and an output voltage Vout of the soft start circuit of the charge pump respectively, and the other end of the third capacitor C3 and the other end of the load resistor RL are connected together and are also connected to the power supply ground GND.
2. The soft-start circuit of claim 1, wherein the first MOS transistor M1, the third MOS transistor M3 and the fourth MOS transistor M4 are all PMOS transistors.
3. The soft-start circuit of claim 1, wherein the second MOS transistor M2 is an NMOS transistor.
4. The soft-start circuit of a charge pump as claimed in claim 1, wherein the first diode D0 is a biasing diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110911775.4A CN113489302B (en) | 2021-08-10 | 2021-08-10 | Soft start circuit of charge pump |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110911775.4A CN113489302B (en) | 2021-08-10 | 2021-08-10 | Soft start circuit of charge pump |
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| CN113489302A true CN113489302A (en) | 2021-10-08 |
| CN113489302B CN113489302B (en) | 2024-06-25 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201490880U (en) * | 2009-05-31 | 2010-05-26 | Bcd半导体制造有限公司 | Soft-start circuit of electric-charge pump |
| CN202004641U (en) * | 2011-03-01 | 2011-10-05 | 深圳艾科创新微电子有限公司 | Switched capacitance charge pump with soft-start circuit |
| US20140217999A1 (en) * | 2013-02-01 | 2014-08-07 | Joshua Wibben | Soft start circuits and techniques |
| CN108429445A (en) * | 2017-02-13 | 2018-08-21 | 珠海全志科技股份有限公司 | A kind of soft starting circuit applied to charge pump |
| CN110445364A (en) * | 2019-09-11 | 2019-11-12 | 上海南芯半导体科技有限公司 | Soft for 1:2 reversed charge pump opens electricity and driving circuit and its implementation |
| CN210225247U (en) * | 2019-07-31 | 2020-03-31 | 北京大豪科技股份有限公司 | Soft start circuit and power switch |
| CN215420096U (en) * | 2021-08-10 | 2022-01-04 | 无锡靖芯科技有限公司 | Soft start circuit of charge pump |
-
2021
- 2021-08-10 CN CN202110911775.4A patent/CN113489302B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201490880U (en) * | 2009-05-31 | 2010-05-26 | Bcd半导体制造有限公司 | Soft-start circuit of electric-charge pump |
| CN202004641U (en) * | 2011-03-01 | 2011-10-05 | 深圳艾科创新微电子有限公司 | Switched capacitance charge pump with soft-start circuit |
| US20140217999A1 (en) * | 2013-02-01 | 2014-08-07 | Joshua Wibben | Soft start circuits and techniques |
| CN108429445A (en) * | 2017-02-13 | 2018-08-21 | 珠海全志科技股份有限公司 | A kind of soft starting circuit applied to charge pump |
| CN210225247U (en) * | 2019-07-31 | 2020-03-31 | 北京大豪科技股份有限公司 | Soft start circuit and power switch |
| CN110445364A (en) * | 2019-09-11 | 2019-11-12 | 上海南芯半导体科技有限公司 | Soft for 1:2 reversed charge pump opens electricity and driving circuit and its implementation |
| CN215420096U (en) * | 2021-08-10 | 2022-01-04 | 无锡靖芯科技有限公司 | Soft start circuit of charge pump |
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