CN110932531A - Drive circuit and power supply control circuit - Google Patents
Drive circuit and power supply control circuit Download PDFInfo
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- CN110932531A CN110932531A CN201911173159.2A CN201911173159A CN110932531A CN 110932531 A CN110932531 A CN 110932531A CN 201911173159 A CN201911173159 A CN 201911173159A CN 110932531 A CN110932531 A CN 110932531A
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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
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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
- H02M1/32—Means for protecting converters other than automatic disconnection
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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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0038—Circuits or arrangements for suppressing, e.g. by masking incorrect turn-on or turn-off signals, e.g. due to current spikes in current mode control
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Abstract
The invention relates to a driving circuit and a power supply control circuit. Wherein, drive circuit for drive has filter capacitor's switching power supply circuit, includes: the switching power supply control circuit is used for outputting a surge suppression control signal when the first voltage difference is detected to be higher than a preset first threshold value; the switching power supply main circuit is also used for driving the switching power supply main circuit to work when the first voltage difference is detected to be lower than a preset second threshold value; the first voltage difference is the voltage difference between the output voltage of a power supply of the main circuit of the switching power supply and the voltage of the filter capacitor; and the surge suppression circuit is used for charging the filter capacitor when receiving the surge suppression control signal sent by the switching power supply control circuit. When the first voltage difference is higher than a preset first threshold value, the filter capacitor is charged firstly, and the switching power supply circuit is driven to work until the first voltage difference is lower than a preset second threshold value, so that surge current is not generated when the switching power supply circuit is started, and the purpose of surge suppression is achieved.
Description
Technical Field
The invention relates to the technical field of switching power supplies, in particular to a driving circuit and a power supply control circuit.
Background
Switching power supplies are essential critical components in modern electronic systems. The switching power supply functions to convert an input voltage into an output voltage that meets the load requirements. A large filter capacitor is generally added to the switching power supply. Because the voltage across the capacitance is zero or close to zero before the input is not turned on. Therefore, when the input power is turned on, the input power charges the capacitor, and a large power-on surge current is generated in the initial stage of charging. Because the magnitude of the capacitor charging current depends on the impedance and the input voltage of the charging loop, the smaller the impedance of the charging loop is, the larger the surge current is; the higher the input voltage, the greater the inrush current. In the switching power supply without the surge suppression circuit, the impedance is mainly the equivalent resistance ESR of the capacitor, and usually the ESR is only in the milliohm level, so the initial charging current of the capacitor, i.e. the startup surge current, is very large.
The general switching power supply mostly adopts a mode of increasing the impedance of an input loop of the switching power supply to inhibit the startup surge current of the switching power supply. A common way is to add a current limiting resistor in the input loop. This scheme is the simplest and most efficient method for low power, i.e. low input current, switching power supplies.
The method of directly connecting the resistor in series can effectively inhibit the startup surge current, but cannot be applied to a high-power supply or a circuit with larger input working current. Because the introduced surge suppression resistor consumes large energy when the switching power supply works, the efficiency of the switching power supply is reduced; the effective input voltage range of the switching power supply is also reduced.
Disclosure of Invention
In view of the above, it is desirable to provide a driving circuit that can suppress a surge current without consuming energy when a switching power supply is operated.
A drive circuit for driving a switching power supply circuit having a filter capacitor, comprising:
the switching power supply control circuit is used for outputting a surge suppression control signal when the first voltage difference is detected to be higher than a preset first threshold value; the switching power supply main circuit is also used for driving the switching power supply main circuit to work when the first voltage difference is detected to be lower than a preset second threshold value; the first voltage difference is the voltage difference between the output voltage of a power supply of the main circuit of the switching power supply and the voltage of the filter capacitor;
and the surge suppression circuit is used for charging the filter capacitor when receiving the surge suppression control signal sent by the switching power supply control circuit.
In one embodiment, the surge suppression circuit includes:
the charging control circuit is used for outputting a charging control signal when receiving the surge suppression control signal;
and the charging circuit is used for being respectively connected with the power supply and the filter capacitor and charging the filter capacitor when receiving the charging control signal.
In one embodiment, the first output terminal of the switching power supply control circuit is used for connecting the switching power supply main circuit, the second output terminal is used for connecting the controlled terminal of the charging control circuit, the first input terminal is used for connecting the first terminal of the filter capacitor, and the second input terminal is used for connecting the power supply output terminal of the power supply.
In one embodiment, the charge control circuit includes a controlled switch,
the input end of the controlled switch is used for connecting a power supply, the output end of the controlled switch is used for connecting the input end of the charging circuit, and the controlled end of the controlled switch is connected with the second output end of the switch power supply control circuit.
In one embodiment, the controlled switch is an NMOS transistor Q1;
the charging circuit includes: a resistor R1, an inductor L1 and a diode D1;
the grid electrode of the NMOS tube Q1 is connected with the second output end of the switch power supply control circuit, the source electrode is connected with the first end of the resistor R1, and the drain electrode is used for being connected with the power supply output end of the power supply;
the first end of the inductor L1 is connected with the second end of the resistor R1, and the second end is used for being connected with the first end of the filter capacitor;
the diode D1 has a cathode connected to the first terminal of the inductor L1 and an anode connected to the ground of the power supply and the second terminal of the filter capacitor, respectively.
In one embodiment, the charge control circuit further comprises a PWM control circuit;
a first sampling end of the PWM control circuit is connected with a first end of the resistor R1, a second sampling end of the PWM control circuit is connected with a second end of the resistor R1, a controlled end of the PWM control circuit is connected with a second output end of the switching power supply control circuit, and an output end of the PWM control circuit is connected with a grid electrode of the NMOS transistor Q1;
the PWM control circuit is used for carrying out PWM control on the NMOS tube Q1 according to the second voltage difference, and outputting a low level to the grid electrode of the NMOS tube Q1 when the second voltage difference is higher than a preset third threshold value; when the second voltage difference is lower than a preset fourth threshold value, outputting a high level to the gate of the NMOS transistor Q1; the second voltage difference is a voltage difference between the voltage collected by the first sampling end and the voltage collected by the second sampling end.
In one embodiment, the controlled switch is an NPN transistor Q2;
the charging circuit includes: a resistor R1, an inductor L1 and a diode D1;
the base electrode of the NPN triode Q2 is connected with the second output end of the switching power supply control circuit, the emitter electrode is connected with the first end of the resistor R1, and the collector electrode is used for being connected with the power supply output end of the power supply;
the first end of the inductor L1 is connected with the second end of the resistor R1, and the second end is used for being connected with the first end of the filter capacitor;
the diode D1 has a cathode connected to the first terminal of the inductor L1 and an anode connected to the ground of the power supply and the second terminal of the filter capacitor, respectively.
In one embodiment, the charge control circuit further comprises a PWM control circuit;
a first sampling end of the PWM control circuit is connected with a first end of the resistor R1, a second sampling end of the PWM control circuit is connected with a second end of the resistor R1, a controlled end of the PWM control circuit is connected with a second output end of the switching power supply control circuit, and an output end of the PWM control circuit is connected with a base electrode of an NPN triode Q2;
the PWM control circuit is used for carrying out PWM control on the NPN triode Q2 according to the second voltage difference, and outputting a low level to the base electrode of the NPN triode Q2 when the second voltage difference is higher than a preset third threshold value; when the second voltage difference is lower than a preset fourth threshold value, outputting a high level to the base electrode of an NPN triode Q2; the second voltage difference is a voltage difference between the voltage collected by the first sampling end and the voltage collected by the second sampling end.
In one embodiment, the switching power supply control circuit comprises a single chip microcomputer.
A power supply control circuit comprises a switching power supply circuit with a filter capacitor and a driving circuit.
The drive circuit and the power supply control circuit detect a first voltage difference between the output voltage of the power supply and the voltage of the filter capacitor through the switching power supply control circuit, and output a surge suppression control signal to the surge suppression circuit when the first voltage difference is higher than a preset first threshold value, the surge suppression circuit charges the filter capacitor when receiving the surge suppression control signal, the switching power supply circuit is driven to work until the first voltage difference is lower than a preset second threshold value, the filter capacitor is charged before the switching power supply circuit starts to work, surge current cannot be generated when the switching power supply circuit is started, and the purpose of surge suppression is achieved.
Drawings
FIG. 1 is a block diagram of a driving circuit according to an embodiment;
FIG. 2 is a block diagram of a driving circuit according to another embodiment;
FIG. 3 is a schematic circuit diagram of a driving circuit in which the controlled switch is an NMOS transistor according to an embodiment;
FIG. 4 is a schematic circuit diagram of a driving circuit in another embodiment in which the controlled switch is an NMOS transistor;
fig. 5 is a schematic circuit diagram of a driving circuit in which the controlled switch is an NPN transistor according to an embodiment;
fig. 6 is a schematic circuit diagram of a driving circuit in which the controlled switch is an NPN transistor according to another embodiment.
Detailed Description
In order that the invention may be more fully understood, reference will now be made to the following description. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "one end," "the other end," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
In one embodiment, as shown in fig. 1, there is provided a driving circuit for driving a switching power supply circuit having a filter capacitor, including:
the switching power supply control circuit is used for outputting a surge suppression control signal when the first voltage difference is detected to be higher than a preset first threshold value; the switching power supply main circuit is also used for driving the switching power supply main circuit to work when the first voltage difference is detected to be lower than a preset second threshold value; the first voltage difference is the voltage difference between the output voltage of a power supply of the main circuit of the switching power supply and the voltage of the filter capacitor;
and the surge suppression circuit is used for charging the filter capacitor when receiving the surge suppression control signal sent by the switching power supply control circuit.
In one embodiment, the first threshold is not equal to the second threshold; in one embodiment, the first threshold is equal to the second threshold.
The operation of the main circuit of the switching power supply means that the part of the switching power supply circuit except the filter capacitor is connected with a power supply, wherein the switching power supply circuit is driven to operate, and in one embodiment, the switching power supply control circuit can output an enable signal to electrify the main circuit of the switching power supply; in one embodiment, the switching power supply control circuit may also provide an operating voltage for a chip in the main circuit of the switching power supply, so that the chip is powered on to operate.
In one embodiment, the switching power supply control circuit drives the switching power supply and stops outputting the surge suppression control signal when detecting that the first voltage difference is lower than the second threshold, the surge suppression circuit stops charging the filter capacitor, namely the surge suppression circuit does not work, the surge suppression circuit does not consume the energy of the main circuit of the switching power supply, and the efficiency and the effective input voltage range of the switching power supply circuit are ensured.
The drive circuit detects a first voltage difference between the output voltage of the power supply and the voltage of the filter capacitor through the switching power supply control circuit, outputs a surge suppression control signal to the surge suppression circuit when the first voltage difference is higher than a preset first threshold value, the surge suppression circuit charges the filter capacitor when receiving the surge suppression control signal, the main circuit of the switching power supply is driven to work until the first voltage difference is lower than a preset second threshold value, the filter capacitor is charged before the main circuit of the switching power supply starts to work, no surge current is generated when the main circuit of the switching power supply is started, and the purpose of suppressing surge is achieved.
In one embodiment, as shown in fig. 2, the surge suppression circuit includes:
the charging control circuit is used for outputting a charging control signal when receiving the surge suppression control signal;
and the charging circuit is used for being respectively connected with the power supply and the filter capacitor and charging the filter capacitor when receiving the charging control signal.
The charging control circuit receives a surge suppression control signal sent by the switching power supply control circuit, and at this time, because the first voltage difference is higher than a preset first threshold, if the main circuit of the switching power supply is directly driven to work, the power supply also needs to charge the filter capacitor, and surge current still possibly occurs, so that the switching power supply circuit is not driven to work until the first voltage difference is lower than a second threshold.
When the charging circuit receives the charging control signal, the power supply and the filter capacitor are conducted, so that the power supply can charge the filter capacitor.
In one embodiment, as shown in fig. 3, the first output terminal of the switching power supply control circuit is used for connecting the switching power supply circuit, the second output terminal is used for connecting the controlled terminal of the charging control circuit, the first input terminal is used for connecting the first terminal of the filter capacitor, and the second input terminal is used for connecting the power supply output terminal of the power supply.
When the switching power supply control circuit detects that the first voltage difference is lower than a second threshold value, a switching power supply driving signal is output through a first output end to drive a main circuit of the switching power supply to work; detecting the terminal voltage of the filter capacitor through the first input end, and detecting the output voltage of the power supply through the second input end; when the switching power supply control circuit detects that the first voltage difference is higher than the first threshold value, the surge suppression control circuit outputs a surge suppression control signal to the charging control circuit through the second output end. In one embodiment, as shown in fig. 3, the charge control circuit includes a controlled switch,
the input end of the controlled switch is used for connecting a power supply, the output end of the controlled switch is used for connecting the input end of the charging circuit, and the controlled end of the controlled switch is connected with the second output end of the switch power supply control circuit.
The charging circuit is connected to a power supply through the controlled switch, when the controlled end of the controlled switch receives a surge suppression control signal sent by the switch power supply control circuit, the controlled switch is conducted, namely the charging circuit is conducted with the power supply, and the charging circuit charges the filter capacitor by using the electric energy of the power supply.
In one embodiment, as shown in fig. 3, the controlled switch is an NMOS transistor Q1;
the charging circuit includes: a resistor R1, an inductor L1 and a diode D1;
the grid electrode of the NMOS tube Q1 is connected with the second output end of the switch power supply control circuit, the source electrode is connected with the first end of the resistor R1, and the drain electrode is used for being connected with the power supply output end of the power supply;
the first end of the inductor L1 is connected with the second end of the resistor R1, and the second end is used for being connected with the first end of the filter capacitor;
the diode D1 has a cathode connected to the first terminal of the inductor L1 and an anode connected to the ground of the power supply and the second terminal of the filter capacitor, respectively.
Because the NMOS transistor has a high level turn-on characteristic, when the gate of the NMOS transistor Q1 receives a high level signal output by the switching power supply control circuit, the NMOS transistor Q1 turns on, the power supply charges the filter capacitor through the resistor R1 and the inductor L1, and when the switching power supply control circuit detects that the first voltage difference is lower than the second threshold value, the output of the high level signal to the switching power supply control circuit is stopped, and the NMOS transistor Q1 is turned off.
The voltage reduction type charging circuit is formed by the resistor R1, the inductor L1 and the diode D1, the voltage of the filter capacitor can be guaranteed not to be higher than the voltage of the power supply, and for the main circuit of the switching power supply, if a non-isolation type circuit is adopted, the voltage of the filter capacitor is higher than the voltage of the power supply, voltage backflow can occur, and components are damaged.
In some embodiments, if the main circuit of the switching power supply employs an isolation circuit capable of isolating the filter capacitor from the power supply, a boost charging circuit or other non-buck charging circuit may be used.
In one embodiment, the controlled switch may be composed of a plurality of MOS transistors connected in parallel, may be composed of only an NMOS transistor, or may be composed of both an NMOS transistor and a PMOS transistor. In one embodiment, the resistor R1 may be composed of several resistors connected in parallel or in series. In one embodiment, the inductor L1 may be formed by several inductors connected in parallel or in series.
In one embodiment, as shown in fig. 4, the charge control circuit further includes a PWM control circuit;
a first sampling end of the PWM control circuit is connected with a first end of the resistor R1, a second sampling end of the PWM control circuit is connected with a second end of the resistor R1, a controlled end of the PWM control circuit is connected with a second output end of the switching power supply control circuit, and an output end of the PWM control circuit is connected with a grid electrode of the NMOS transistor Q1;
the PWM control circuit is used for carrying out PWM control on the NMOS tube Q1 according to the second voltage difference, and outputting a low level to the grid electrode of the NMOS tube Q1 when the second voltage difference is higher than a preset third threshold value; when the second voltage difference is lower than a preset fourth threshold value, outputting a high level to the gate of the NMOS transistor Q1; the second voltage difference is a voltage difference between the voltage collected by the first sampling end and the voltage collected by the second sampling end.
The PWM control circuit forms closed-loop control by utilizing the second voltage difference, and controls the connection and disconnection of the NMOS tube Q1 according to the second voltage difference so as to adjust the duty ratio of the output voltage of the NMOS tube Q1. In some embodiments, the PWM control circuit may employ a PWM control chip, such as a PWM control chip with models LM5020 and UC 2843. Those skilled in the art can select from PWM control circuits commonly known in the art according to specific needs, as long as PWM control can be realized.
In one embodiment, the third threshold is not equal to the fourth threshold; in one embodiment, the third threshold is equal to the fourth threshold. In one embodiment, as shown in fig. 5, the controlled switch is an NPN transistor Q2;
the charging circuit includes: a resistor R1, an inductor L1 and a diode D1;
the base electrode of the NPN triode Q2 is connected with the second output end of the switching power supply control circuit, the emitter electrode is connected with the first end of the resistor R1, and the collector electrode is used for being connected with the power supply output end of the power supply;
the first end of the inductor L1 is connected with the second end of the resistor R1, and the second end is used for being connected with the first end of the filter capacitor;
the diode D1 has a cathode connected to the first terminal of the inductor L1 and an anode connected to the ground of the power supply and the second terminal of the filter capacitor, respectively.
Because the NPN triode has the characteristic of high-level conduction, when the base of the NPN triode Q2 receives a high-level signal output by the switching power supply control circuit, the NPN triode Q2 is turned on, the power supply charges the filter capacitor through the resistor R1 and the inductor L1, and when the switching power supply control circuit detects that the first voltage difference is lower than the second threshold, the NPN triode Q2 is turned off and stops outputting the high-level signal to the switching power supply control circuit.
In one embodiment, the controlled switch may be composed of a plurality of transistors connected in parallel, may be composed of only NPN transistors, or may be composed of both NPN and PNP transistors. In one embodiment, the resistor R1 may be composed of several resistors connected in parallel or in series. In one embodiment, the inductor L1 may be formed by several inductors connected in parallel or in series.
In one embodiment, as shown in fig. 6, the charge control circuit further includes a PWM control circuit;
a first sampling end of the PWM control circuit is connected with a first end of the resistor R1, a second sampling end of the PWM control circuit is connected with a second end of the resistor R1, a controlled end of the PWM control circuit is connected with a second output end of the switching power supply control circuit, and an output end of the PWM control circuit is connected with a base electrode of an NPN triode Q2;
the PWM control circuit is used for carrying out PWM control on the NPN triode Q2 according to the second voltage difference, and outputting a low level to the base electrode of the NPN triode Q2 when the second voltage difference is higher than a preset third threshold value; when the second voltage difference is lower than a preset fourth threshold value, outputting a high level to the base electrode of an NPN triode Q2; the second voltage difference is a voltage difference between the voltage collected by the first sampling end and the voltage collected by the second sampling end.
The PWM control circuit forms closed-loop control by utilizing the second voltage difference, and controls the on and off of the NPN triode Q2 according to the second voltage difference so as to adjust the duty ratio of the output voltage of the NPN triode Q2.
In one embodiment, the switching power supply control circuit comprises a single chip microcomputer.
For the configuration of the switching power supply control circuit, a common signal control circuit can be adopted, and in one embodiment, the switching power supply control circuit can be controlled by a single chip microcomputer and comprises the single chip microcomputer and peripheral circuits thereof. The skilled person can select as desired.
A power supply control circuit comprises a switching power supply circuit with a filter capacitor and a driving circuit in any one of the above embodiments.
For the structure of the power supply control circuit, reference may be made to the description in the foregoing embodiments, and details are not repeated here.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A driving circuit for driving a switching power supply circuit having a filter capacitor, comprising:
the switching power supply control circuit is used for outputting a surge suppression control signal when the first voltage difference is detected to be higher than a preset first threshold value; the switching power supply main circuit is also used for driving the switching power supply main circuit to work when the first voltage difference is detected to be lower than a preset second threshold value; the first voltage difference is the voltage difference between the output voltage of a power supply of the main circuit of the switching power supply and the voltage of the filter capacitor;
and the surge suppression circuit is used for charging the filter capacitor when receiving the surge suppression control signal sent by the switching power supply control circuit.
2. The driving circuit of claim 1, wherein the surge suppression circuit comprises:
the charging control circuit is used for outputting a charging control signal when receiving the surge suppression control signal;
and the charging circuit is used for being respectively connected with the power supply and the filter capacitor and charging the filter capacitor when receiving the charging control signal.
3. The driving circuit according to claim 2, wherein the switching power supply control circuit has a first output terminal for connecting to the switching power supply main circuit, a second output terminal for connecting to the controlled terminal of the charging control circuit, a first input terminal for connecting to the first terminal of the filter capacitor, and a second input terminal for connecting to the power supply output terminal of the power supply.
4. The drive circuit of claim 3, wherein the charge control circuit comprises a controlled switch,
the input end of the controlled switch is used for being connected with a power supply, the output end of the controlled switch is used for being connected with the input end of the charging circuit, and the controlled end of the controlled switch is connected with the second output end of the switch power supply control circuit.
5. The driving circuit as claimed in claim 4, wherein the controlled switch is an NMOS transistor Q1;
the charging circuit includes: a resistor R1, an inductor L1 and a diode D1;
the grid electrode of the NMOS tube Q1 is connected with the second output end of the switch power supply control circuit, the source electrode is connected with the first end of the resistor R1, and the drain electrode is used for being connected with the power supply output end of the power supply;
the first end of the inductor L1 is connected with the second end of the resistor R1, and the second end is used for being connected with the first end of the filter capacitor;
the cathode of the diode D1 is connected to the first end of the inductor L1, and the anode is connected to the ground terminal of the power supply and the second end of the filter capacitor, respectively.
6. The drive circuit according to claim 5, wherein the charge control circuit further comprises a PWM control circuit;
a first sampling end of the PWM control circuit is connected with a first end of the resistor R1, a second sampling end of the PWM control circuit is connected with a second end of the resistor R1, a controlled end of the PWM control circuit is connected with a second output end of the switching power supply control circuit, and an output end of the PWM control circuit is connected with a grid electrode of the NMOS transistor Q1;
the PWM control circuit is used for carrying out PWM control on the NMOS transistor Q1 according to a second voltage difference, and outputting a low level to the grid electrode of the NMOS transistor Q1 when the second voltage difference is higher than a preset third threshold value; when the second voltage difference is lower than a preset fourth threshold value, outputting a high level to the gate of the NMOS transistor Q1; the second voltage difference is a voltage difference between the voltage collected by the first sampling end and the voltage collected by the second sampling end.
7. The driving circuit according to claim 4, wherein the controlled switch is an NPN transistor Q2;
the charging circuit includes: a resistor R1, an inductor L1 and a diode D1;
the base electrode of the NPN triode Q2 is connected with the second output end of the switching power supply control circuit, the emitter electrode of the NPN triode Q2 is connected with the first end of the resistor R1, and the collector electrode of the NPN triode Q2 is used for being connected with the power supply output end of the power supply;
the first end of the inductor L1 is connected with the second end of the resistor R1, and the second end is used for being connected with the first end of the filter capacitor;
the cathode of the diode D1 is connected to the first end of the inductor L1, and the anode is connected to the ground terminal of the power supply and the second end of the filter capacitor, respectively.
8. The drive circuit according to claim 7, wherein the charge control circuit further comprises a PWM control circuit;
a first sampling end of the PWM control circuit is connected with a first end of the resistor R1, a second sampling end of the PWM control circuit is connected with a second end of the resistor R1, a controlled end of the PWM control circuit is connected with a second output end of the switching power supply control circuit, and an output end of the PWM control circuit is connected with a base electrode of the NPN triode Q2;
the PWM control circuit is used for carrying out PWM control on the NPN triode Q2 according to a second voltage difference, and when the second voltage difference is higher than a preset third threshold value, a low level is output to the base electrode of the NPN triode Q2; when the second voltage difference is lower than a preset fourth threshold value, outputting a high level to the base of the NPN triode Q2; the second voltage difference is a voltage difference between the voltage collected by the first sampling end and the voltage collected by the second sampling end.
9. The driving circuit according to claim 3, wherein the switching power supply control circuit comprises a single chip microcomputer.
10. A power supply control circuit comprising a switching power supply circuit having a filter capacitor and a drive circuit as claimed in any one of claims 1 to 9.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112701892A (en) * | 2020-12-14 | 2021-04-23 | 珠海格力电器股份有限公司 | Processing method and device system for preventing current impact and electric equipment |
| CN113359559A (en) * | 2021-06-15 | 2021-09-07 | 威海新北洋技术服务有限公司 | Control circuit and storage device |
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| CN113359559A (en) * | 2021-06-15 | 2021-09-07 | 威海新北洋技术服务有限公司 | Control circuit and storage device |
| CN113359559B (en) * | 2021-06-15 | 2022-03-29 | 威海新北洋技术服务有限公司 | Control circuit and storage device |
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