CN115102401B - Power supply circuit and switching power supply - Google Patents
Power supply circuit and switching power supply Download PDFInfo
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- CN115102401B CN115102401B CN202211015601.0A CN202211015601A CN115102401B CN 115102401 B CN115102401 B CN 115102401B CN 202211015601 A CN202211015601 A CN 202211015601A CN 115102401 B CN115102401 B CN 115102401B
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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
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
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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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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Abstract
The application discloses supply circuit and switching power supply, supply circuit include first electric capacity, second electric capacity and charge-discharge control circuit, the first end attach switch node of first electric capacity, and the second end of first electric capacity is used for providing first supply voltage, and the first end of second electric capacity is passed through charge-discharge control circuit's control connection reference ground end or input voltage, the second end of second electric capacity is used for providing second supply voltage, wherein, during high side switch tube switches on, charge-discharge control circuit control the second electric capacity charges in the first time stage, discharges in order to maintain in the second time stage the power supply of high side driver is stable. The invention can provide charge supplement for the high-side driver under the condition of longer conduction time of the high-side switching tube, and is beneficial to keeping the normal work of the system under the condition of large duty ratio.
Description
Technical Field
The invention relates to the technical field of power conversion, in particular to a power supply circuit and a switching power supply.
Background
The existing half-bridge switching circuit mainly realizes the conversion of voltage by controlling the on and off of two interconnected transistors. Taking a BUCK conversion circuit such as a BUCK circuit as an example, as shown in fig. 1, the controller 11 sends a pulse signal to the gates of two connected switching tubes (QH and QL) to control the duty ratio of the switching tubes, so as to control the induced voltage on the power inductor L in the BUCK conversion circuit, thereby realizing the conversion of the voltage.
In the step-down process, in order to obtain better electrical performance, an NMOS transistor is usually used as the high-side switch, and when the high-side NMOS transistor is turned on, a power end of the high-side switch is connected to the input voltage, so that a higher potential than the input voltage Vin needs to be provided as the driving voltage of the high-side switch QH.
As shown in fig. 1, a bootstrap capacitor C1 is generally sampled as a power supply to provide a sufficient driving voltage for the high-side switch QH, and the bootstrap capacitor C1 supplements charges through the power VCC when the low-side switch QL is turned on, but in some cases, the turn-on time of the high-side switch is very long, which causes the turn-on time of the low-side switch to be very short or not turned on at all, and the corresponding bootstrap capacitor (C1) does not have sufficient time to charge, which causes the driving voltage of the high-side switch to be insufficient and the high-side switch cannot operate normally, and therefore, it is necessary to provide an improved technical solution to overcome the above technical problems in the prior art.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a power supply circuit and a switching power supply, so as to solve the technical problem of insufficient power supply to a high-side switching tube in the prior art.
The technical solution of the present invention is to provide a power supply circuit applied to a switching power supply, where the switching power supply includes a high-side switching tube and a low-side switching tube connected by a switching node, the high-side switching tube is driven by a high-side driver, and the high-side switching tube and the low-side switching tube perform switching conversion to convert an input voltage into an output voltage, and the power supply circuit includes: the high-side driver comprises a first capacitor, a second capacitor and a charge and discharge control circuit, wherein the first end of the first capacitor is connected with the switch node, the second end of the first capacitor is used for providing a first power supply voltage, the first end of the second capacitor is connected with a reference ground end or an input voltage through the control of the charge and discharge control circuit, and the second end of the second capacitor is used for providing a second power supply voltage, wherein during the conduction period of the high-side switch tube, the charge and discharge control circuit controls the second capacitor to be charged in a first time stage and to be discharged in a second time stage so as to maintain the stability of the power supply of the high-side driver.
Preferably, the second terminal of the first capacitor is connected to the power supply terminal of the high-side driver to provide a first power supply voltage thereto, the second terminal of the second capacitor is connected to the power supply terminal of the high-side driver to provide a power supply voltage thereto, and the second terminal of the second capacitor is connected to the second terminal of the first capacitor to provide a power supply voltage thereto.
Preferably, the second terminal of the second capacitor is connected to the second terminal of the first capacitor to provide a supply voltage thereto, and the second terminal of the first capacitor is connected to the supply terminal of the high-side driver to provide a first supply voltage thereto.
Preferably, in the first time period, the charge and discharge control circuit controls the second end of the second capacitor to receive a reference power supply voltage to charge the second capacitor, and the first end of the second capacitor is connected to a reference ground end; and in the second time period, the second end of the second capacitor outputs the power supply charge through the first one-way conduction device, and the first end of the second capacitor is connected with the input voltage.
Preferably, the charge and discharge control circuit controls to receive a switching signal of the high-side switching tube and/or the voltage of the switching node, and controls the charge and discharge of the second capacitor according to the switching signal and/or the voltage of the switching node.
Preferably, the charge and discharge control circuit includes a first switch tube and a second switch tube connected between the input voltage and the reference ground, a voltage regulator circuit, and a first control circuit, the first control circuit receives the switching signal of the high-side switch tube and/or the switch node voltage to control on/off of the first switch tube and the second switch tube, and the voltage regulator circuit is connected between the reference power voltage and the second end of the second capacitor.
Preferably, the voltage stabilizing circuit comprises a third switching tube and a second one-way conduction device, a control end of the third switching tube is connected with a reference ground end, a first power end is connected with the reference power supply voltage, a second power end is connected with an anode of the second one-way conduction device, and a cathode of the second one-way conduction device is connected with a second end of the second capacitor.
Preferably, the voltage stabilizing circuit comprises a third switching tube and a fourth switching tube, a control end of the third switching tube is connected with a reference ground end, a first power end of the third switching tube is connected with a reference power supply voltage, a second power end of the third switching tube is connected with a first power end of the fourth switching tube, a second power end of the fourth switching tube is connected with a second end of the second capacitor, and the first control circuit controls the fourth switching tube to be switched on and off according to a switching signal of the high-side switching tube and/or the switching node voltage.
Preferably, the charge-discharge control circuit controls the second capacitor to charge when the voltage of the switch node jumps from a low level to a high level or when a switch signal of a high-side switch tube changes from an inactive state to an active state.
Preferably, the charge and discharge control circuit controls the second capacitor to discharge after the second capacitor is charged for the first time period, before the switch node voltage jumps from a high level to a low level or when a switch signal of a high-side switch tube changes from active to inactive, the charge and discharge control circuit controls the second capacitor to discharge and cut off, and the discharge time of the second capacitor is recorded as the second time period.
Preferably, when the switch node voltage jumps from a low level to a high level or when a switch signal of a high-side switch tube changes from invalid to valid, the charge-discharge control circuit controls the second capacitor to be charged for the first time, the charge-discharge control circuit controls the second capacitor to be discharged for the first time after the second capacitor is charged for the first time period, the charge-discharge control circuit controls the second capacitor to be charged for the second time after the second capacitor is discharged for the second time period if the switch node voltage does not jump from the low level to the high level or when the switch signal of the high-side switch tube does not change from invalid to valid, and the charge-discharge control circuit controls the second capacitor to be discharged for the second time after the second capacitor is charged for the first time period, and the cycle is repeated.
Preferably, in the first period of time, the charge and discharge control circuit controls a reference power supply voltage to charge the second capacitor, and during a period when the high-side switch tube is turned off, the charge and discharge control circuit controls the reference power supply voltage to charge the second capacitor again, and the second capacitor charges the first capacitor.
In a second aspect, a switching power supply is provided, which includes a controller, a high-side switching tube and a low-side switching tube connected via a switching node, and a high-side driver for driving the high-side switching tube and a low-side driver for driving the low-side switching tube, and includes the above-mentioned power supply circuit, where the high-side driver and the low-side driver receive a switching signal output by the controller to drive switching states of the high-side switching tube and the low-side switching tube; the supply voltage generated by the supply circuit is used to power the high-side driver.
By adopting the circuit structure, the first capacitor and the second capacitor are used for supplying power, so that the second capacitor can discharge and supplement charges in time under the condition that the high-side switch tube is longer in conduction time due to insufficient power supply charge of the first capacitor, and a driver of the high-side switch tube can be ensured to have enough charges for power supply, and the high-side switch tube can normally work.
Drawings
FIG. 1 is a schematic power supply diagram of a buck converter circuit according to the prior art;
fig. 2 is a circuit block diagram of a first embodiment of a power supply circuit applied to a switching power supply according to the present invention;
fig. 3 is a circuit diagram of a second embodiment of a power supply circuit applied to a switching power supply according to the invention;
fig. 4 is a circuit block diagram of a third embodiment of a power supply circuit applied to a switching power supply according to the present invention;
FIG. 5 is a waveform diagram according to the first case of FIG. 3;
fig. 6 is a waveform diagram according to the second case of fig. 3.
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to only these embodiments. The invention is intended to cover alternatives, modifications, equivalents and alternatives which may be included within the spirit and scope of the invention.
In the following description of the preferred embodiments of the present invention, specific details are set forth in order to provide a thorough understanding of the present invention, and it will be apparent to those skilled in the art that the present invention may be practiced without these specific details.
The invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. It should be noted that the drawings are in simplified form and are not to precise scale, which is only used for convenience and clarity to assist in describing the embodiments of the present invention.
Referring to fig. 2, a circuit diagram of a first embodiment of a power supply circuit applied to a switching power supply according to the present invention includes a high-side switching tube QH and a low-side switching tube QL connected by a switching node SW, the high-side switching tube QH is driven by a high-side driver 22, the low-side switching tube QL is driven by a low-side driver 23, a controller 21 generates a switching signal to the drivers, an inductor L1 is connected between the switching node and an output voltage to form a buck switching power supply, and the high-side switching tube QH and the low-side switching tube QL perform switching conversion to convert an input voltage Vin into an output voltage Vo. Illustratively, the power supply circuit includes a first capacitor C1, a second capacitor C2, and a charge and discharge control circuit 24, a first end of the first capacitor C1 is connected to the switch node SW, a second end of the first capacitor is configured to provide a first power supply voltage, a first end CPN of the second capacitor is connected to a reference ground GND or an input voltage Vin through control of the charge and discharge control circuit, and a second end CPP of the second capacitor is configured to provide a second power supply voltage, where in a switching cycle, during a conduction period of the high-side switch tube, the charge and discharge control circuit controls the second capacitor to be charged in a first time period and to be discharged in a second time period to maintain stable power supply of the high-side driver.
Specifically, in the first time period, the charge and discharge control circuit controls the second end of the second capacitor C2 to receive the reference power voltage VDD to charge the second capacitor, and the first end of the second capacitor is connected to the reference ground end; during the second time period, the second terminal of the second capacitor is discharged through the first one-way conduction device to provide the supply charge, and the first terminal of the second capacitor C2 is connected to the input voltage, where the first one-way conduction device is a diode D1.
In the example of fig. 2, the second terminal BST of the first capacitor is connected to the power supply terminal of the high-side driver to provide the first power supply voltage thereto, the second terminal of the second capacitor is connected to the power supply terminal of the high-side driver to provide the power supply voltage thereto, and the second terminal of the second capacitor is connected to the second terminal of the first capacitor to charge the first capacitor, that is, during the second time period, the second power supply voltage of the second capacitor C2 is output through the diode D1 and can be transmitted in two branches, one branch is to supply the high-side driver with the power supply charge, and the other branch is to supply the first capacitor with the charge to supplement the charge amount of the first capacitor. Through the mode, when the high-side switching tube QH is longer in conduction time, the charging time of the first capacitor C1 is insufficient, and under the condition that the charge quantity of the first capacitor C1 is insufficient, the requirement that the switching power supply can normally work under the condition of any duty ratio can be met through charge supplement of the second capacitor C2.
With continued reference to fig. 2, the second capacitor controls the charging and discharging process thereof through a charging and discharging control circuit 24, which receives the switching signal (which may also be the switching signal of the low-side switching tube) of the high-side switching tube or the switching node voltage, and controls the charging and discharging of the second capacitor according to the switching signal or the switching node voltage. Specifically, the charge and discharge control circuit comprises a first switch tube Q1 and a second switch tube Q2 connected between an input voltage and a reference ground end, a voltage stabilizing circuit and a first control circuit 241, wherein the control end of the third switch tube Q3 is connected with the reference ground end, the first power end is connected with a reference power supply voltage VDD, the second power end is connected with the anode of a second one-way conduction device, the cathode of the second one-way conduction device is connected with the second end of the second capacitor, the first control circuit receives a switching signal (HL or LI) of the high-side switch tube and/or the switch node Voltage (VSW) to control the on/off of the first switch tube and the second switch tube, and the voltage stabilizing circuit is connected between the reference power supply voltage and the second end of the second capacitor. Here, the voltage regulator circuit includes a third switching transistor Q3 and a second one-way conduction device D2, and the reference power voltage VDD provides a suitable regulated voltage to charge the second capacitor C2 after passing through the voltage regulator circuit.
Fig. 3 is a circuit block diagram of a second embodiment of a power supply circuit applied to a switching power supply according to the invention; the switching power supply in this embodiment is the same as the first embodiment except that in the power supply circuit
The second end of the second capacitor is connected with the second end of the first capacitor to charge the first capacitor, and the second end of the first capacitor is connected with the power supply end of the high-side driver to provide a first power supply voltage for the high-side driver. In this embodiment, in the second time period, the second capacitor C2 discharges, the diode D1 provides the charging charge to the first capacitor to supplement the charge of the first capacitor, and then the first capacitor provides the supply voltage to the power supply terminal of the high-side driver, so that the control is easier and more convenient. Similarly, when the high-side switching tube QH has a long on-time and the charging time of the first capacitor C1 is not enough, the charge compensation through the second capacitor C2 can meet the requirement that the switching power supply can normally work under the condition of any duty ratio.
Referring to fig. 5 and 6, two operation waveforms of fig. 3 are shown, and the operation principle of the present application is described below with reference to the operation waveforms, referring to fig. 5, at time t1, a switching cycle begins, a switching signal of the high-side switching tube changes from an inactive state to an active state, and a switching node voltage VSW changes to a high level, at which time, the charging control circuit controls the second switching tube Q2 to be turned on, the first switching tube Q1 is turned off, the reference power voltage VDD charges the second capacitor through the voltage stabilizing circuit, the charging time is a preset first time that can be timed by the timer, the charging control circuit controls the first switching tube Q1 to be turned on, the second switching tube Q2 is turned off, the second capacitor is discharged through the diode D1, for example, the second capacitor charges the first capacitor C1 through diode discharging, so as to supplement the charge amount of the first capacitor. And then when the switching signal of the high-side switching tube is changed into an invalid state from the valid state or before the SW node voltage is changed into low level, at the time t3, the charging control circuit controls the second capacitor to cut off discharging, the discharging time period is delta t2, the time can be counted by a timer, and then the timer is cleared. In the example shown in fig. 5, in the switching period, after the high-side switching tube is turned on for a period of time, the switching signal becomes a low-level inactive state, the high-side switching tube is turned off, the low-side switching tube is turned on, the charging control circuit controls the second switching tube Q2 to be turned on, the first switching tube Q1 is turned off, the reference power supply voltage VDD charges the second capacitor through the voltage stabilizing circuit, after the second capacitor is charged to a voltage close to VDD, the diode D1 is turned on, the second capacitor C2 charges the first capacitor C1, the charging period may be Δ t3, at time t4, one switching period is ended, the high-side switching tube is turned on again, the charging control circuit controls charging and discharging of the second capacitor again according to the switching signal, and the timer is reset and then starts to count. Therefore, the charging and the complementary charging of the first capacitor and the charging and discharging control of the second capacitor can be realized, and the power supply requirement of the switching power supply in a state of large duty ratio is met.
Referring to fig. 6, from time t1 to time t3, the operating state and principle are the same as those in fig. 5, except that after time t3, because the on-time of the high-side switching tube is long, the first capacitor C1 cannot obtain the charging time, and at this time, if the switch node voltage does not jump from the low level to the high level or the switching signal of the high-side switching tube does not change from the inactive state to the active state, the charge-discharge control circuit controls the second capacitor to charge for the second time, that is, after time t3, the reference power voltage VDD charges the second capacitor again, and the charge-discharge control circuit controls the second capacitor to discharge for the second time as in the time period Δ t1 after the second capacitor is charged for the first time period, as in the time period Δ t2, and so on. Therefore, the charging and the complementary charging of the first capacitor and the charging and discharging control of the second capacitor can be realized, and the power supply requirement of the switching power supply under the limit condition, such as the state of very long conduction time, can be met.
Fig. 4 is a circuit block diagram of a third embodiment of a power supply circuit applied to a switching power supply according to the present invention, which is substantially the same as the second embodiment except that the voltage stabilizing circuit includes a third switching tube Q3 and a fourth switching tube Q4, a control terminal of the third switching tube is connected to a ground reference terminal, a first power terminal of the third switching tube is connected to a reference power supply voltage VDD, a second power terminal of the third switching tube is connected to a first power terminal of the fourth switching tube, a second power terminal of the fourth switching tube is connected to a second terminal of the second capacitor, and the first control circuit controls on/off of the fourth switching tube according to a switching signal of the high-side switching tube and/or the switching node voltage. Here, the on-off state of the fourth switching tube Q4 is the same as that of the second switching tube Q2, when the second switching tube Q2 is turned on, the fourth switching tube Q4 is turned on, and the reference power voltage charges the second capacitor C2 through the voltage stabilizing circuit. By controlling the switching tube Q4, the circuit cost can be saved and the control is convenient.
To sum up, this application is through the dual power supply of first electric capacity and second electric capacity, can be so that under the longer condition of high side switch tube on-time, because the power supply electric charge volume of first electric capacity is not enough, the supplementary electric charge that can in time discharge of second electric capacity guarantees that the driver of high side switch tube can have sufficient electric charge power supply, and the high side switch tube can normally work always.
The above-described embodiments do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the above-described embodiments should be included in the protection scope of the technical solution.
Claims (13)
1. A power supply circuit for a switching power supply, the switching power supply including a high-side switching transistor and a low-side switching transistor connected by a switching node, the high-side switching transistor being driven by a high-side driver, the high-side switching transistor and the low-side switching transistor performing switching to convert an input voltage to an output voltage, the power supply circuit comprising:
a first capacitor, a second capacitor and a charge and discharge control circuit, wherein a first end of the first capacitor is connected to the switch node, a second end of the first capacitor is used for providing a first supply voltage, a first end of the second capacitor is connected to a reference ground end or an input voltage through the control of the charge and discharge control circuit, a second end of the second capacitor is used for providing a second supply voltage, wherein,
and during the conduction period of the high-side switch tube, the charge and discharge control circuit controls the second capacitor to be charged in a first time period and to be discharged in a second time period so as to maintain the stability of power supply of the high-side driver.
2. The supply circuit according to claim 1, wherein the second terminal of the first capacitor is connected to the supply terminal of the high-side driver to supply a first supply voltage thereto,
the second end of the second capacitor is connected with the power supply end of the high-side driver to provide the power supply voltage for the high-side driver, and the second end of the second capacitor is connected with the second end of the first capacitor to provide the power supply voltage for the first capacitor.
3. The supply circuit according to claim 1, wherein a second terminal of the second capacitor is connected to a second terminal of the first capacitor to supply a supply voltage thereto,
the second end of the first capacitor is connected with the power supply end of the high-side driver to provide a first power supply voltage for the high-side driver.
4. The power supply circuit according to claim 1, wherein in the first time period, the charge-discharge control circuit controls the second terminal of the second capacitor to receive a reference power supply voltage to charge the second capacitor, and the first terminal of the second capacitor is connected to a reference ground terminal;
and in the second time period, the second end of the second capacitor outputs the power supply charge through the first one-way conduction device, and the first end of the second capacitor is connected with the input voltage.
5. The power supply circuit according to claim 1, wherein the charge-discharge control circuit controls to receive a switching signal of the high-side switching tube and/or the switching node voltage, and controls charging and discharging of the second capacitor according to the switching signal and/or the switching node voltage.
6. The power supply circuit of claim 5, wherein the charge and discharge control circuit comprises a first switch tube and a second switch tube connected between the input voltage and the reference ground, a voltage stabilizing circuit, and a first control circuit,
the first control circuit receives the switching signal of the high-side switching tube and/or the switching node voltage to control the on/off of the first switching tube and the second switching tube,
the voltage stabilizing circuit is connected between the reference power voltage and the second end of the second capacitor.
7. The power supply circuit of claim 6, wherein the voltage regulator circuit comprises a third switching transistor and a second one-way conduction device,
the control end of the third switching tube is connected with a reference ground end, the first power end is connected with a reference power supply voltage, the second power end is connected with the anode of the second one-way conducting device, and the cathode of the second one-way conducting device is connected with the second end of the second capacitor.
8. The power supply circuit of claim 6, wherein the voltage regulator circuit comprises a third switching transistor and a fourth switching transistor,
the control end of the third switch tube is connected with a reference ground end, the first power end is connected with a reference power voltage, the second power end is connected with the first power end of the fourth switch tube,
and the second power end of the fourth switching tube is connected with the second end of the second capacitor, and the first control circuit controls the on-off of the fourth switching tube according to the switching signal of the high-side switching tube and/or the switching node voltage.
9. The power supply circuit according to claim 5, wherein the charge and discharge control circuit controls the second capacitor to charge when the switch node voltage jumps from a low level to a high level or when a switch signal of a high-side switch tube changes from inactive to active.
10. The power supply circuit of claim 9, wherein the charge-discharge control circuit controls the second capacitor to discharge after the second capacitor is charged for the first time period,
before the voltage of the switch node jumps from a high level to a low level or when a switch signal of a high-side switch tube changes from active to inactive, the charge and discharge control circuit controls the second capacitor to discharge and cut off, and the discharge time of the second capacitor is recorded as the second time period.
11. The power supply circuit of claim 5, wherein the charge-discharge control circuit controls the second capacitor to charge for the first time when the switch node voltage jumps from a low level to a high level or when a switch signal of a high-side switch tube changes from inactive to active,
the charge-discharge control circuit controls the second capacitor to discharge for the first time after the second capacitor is charged for the first time period,
after the charge and discharge control circuit controls the second capacitor to discharge for the second time period, if the voltage of the switch node is not changed from low level to high level or the switch signal of the high-side switch tube is not changed from invalid to valid, the charge and discharge control circuit controls the second capacitor to charge for the second time,
and the charge and discharge control circuit controls the second capacitor to discharge for the second time after the second capacitor is charged for the first time period, and the cycle is repeated.
12. The power supply circuit according to claim 1, wherein the charge and discharge control circuit controls a reference power supply voltage to charge the second capacitor during the first period of time,
and during the turn-off period of the high-side switching tube, the charge and discharge control circuit controls the reference power supply voltage to charge the second capacitor again, and the second capacitor charges the first capacitor.
13. A switching power supply comprising a controller, a high-side switching transistor and a low-side switching transistor connected by a switching node, and a high-side driver driving the high-side switching transistor and a low-side driver driving the low-side switching transistor, comprising a supply circuit as claimed in any one of claims 1 to 12,
the high-side driver and the low-side driver receive the switching signals output by the controller to drive the switching states of the high-side switching tube and the low-side switching tube;
the supply voltage generated by the supply circuit is used to power the high-side driver.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211015601.0A CN115102401B (en) | 2022-08-24 | 2022-08-24 | Power supply circuit and switching power supply |
| US18/235,362 US20240072655A1 (en) | 2022-08-24 | 2023-08-18 | Supply circuit and switched mode power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211015601.0A CN115102401B (en) | 2022-08-24 | 2022-08-24 | Power supply circuit and switching power supply |
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| CN115102401A CN115102401A (en) | 2022-09-23 |
| CN115102401B true CN115102401B (en) | 2022-11-18 |
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| CN202211015601.0A Active CN115102401B (en) | 2022-08-24 | 2022-08-24 | Power supply circuit and switching power supply |
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| TWM472362U (en) * | 2013-08-07 | 2014-02-11 | Richtek Technology Corp | Buck switching regulator |
| CN111884637B (en) * | 2020-07-10 | 2024-05-31 | 苏州赛芯电子科技股份有限公司 | Bootstrap circuit and power chip |
-
2022
- 2022-08-24 CN CN202211015601.0A patent/CN115102401B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007195361A (en) * | 2006-01-20 | 2007-08-02 | Fuji Electric Device Technology Co Ltd | Bootstrap circuit |
| CN104218803A (en) * | 2014-08-27 | 2014-12-17 | 成都芯源系统有限公司 | Bootstrap voltage charging circuit and voltage conversion circuit |
| CN105827101A (en) * | 2016-05-06 | 2016-08-03 | 成都芯源系统有限公司 | Voltage conversion integrated circuit, bootstrap circuit, and switch driving method |
| US10601302B1 (en) * | 2019-04-04 | 2020-03-24 | Navitas Semiconductor, Inc. | Bootstrap power supply circuit |
| CN112865529A (en) * | 2021-01-11 | 2021-05-28 | 成都芯源系统有限公司 | Circuit and method for providing supply voltage for driving circuit in power supply system |
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| CN115102401A (en) | 2022-09-23 |
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