CN111799991B - Chip power supply circuit - Google Patents
Chip power supply circuit Download PDFInfo
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- CN111799991B CN111799991B CN201910274708.9A CN201910274708A CN111799991B CN 111799991 B CN111799991 B CN 111799991B CN 201910274708 A CN201910274708 A CN 201910274708A CN 111799991 B CN111799991 B CN 111799991B
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention provides a chip power supply circuit, comprising: the switching device comprises a step-down transistor, a control module, a first switching tube, a second switching tube, a third switching tube, a fourth switching tube and a power switching tube. According to the chip power supply circuit, the first end of the second switching tube is directly connected with the buck transistor, and the second switching tube can directly obtain enough driving current from the buck transistor to drive the power switching tube, so that the reliability and the efficiency of a system are ensured, and meanwhile, an energy storage capacitor is not required to be additionally arranged, and the cost of the system is reduced.
Description
Technical Field
The invention belongs to the technical field of circuit design, and particularly relates to a chip power supply circuit.
Background
For a switching power supply system, a power switch tube needs to be driven in operation, and at the moment of driving the power switch tube, enough driving current needs to be provided for the grid electrode of the power switch tube so as to meet the reliability and efficiency of the switching power supply system; this requires that an energy storage capacitor to ground be externally connected to the power pin of the switching power supply chip to ensure that the power switching tube has sufficient current driving capability at the driving moment. The additional arrangement of the energy storage capacitor inevitably results in higher cost of the switching power supply system.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a chip power circuit for solving the problem of high cost caused by the need of an additional energy storage capacitor in the prior art.
To achieve the above and other related objects, the present invention provides a chip power supply circuit comprising: the switching device comprises a step-down transistor, a control module, a first switching tube, a second switching tube, a third switching tube, a fourth switching tube and a power switching tube; wherein, the liquid crystal display device comprises a liquid crystal display device,
the buck transistor comprises a first end, a second end and a third end, wherein the first end of the buck transistor is connected with an input voltage, and the second end of the buck transistor is grounded;
the first switching tube comprises a first end, a second end and a control end, the control end of the first switching tube is connected with a first reference voltage signal, and the first end of the first switching tube is connected with a third end of the buck transistor;
the control module comprises an input end, an output end and a grounding end, wherein the input end of the control module is connected with the second end of the first switch tube, and the grounding end of the control module is grounded; the control module is used for generating a first control signal and a second control signal and outputting the first control signal and the second control signal through the output end of the control module;
the second switching tube comprises a first end, a second end and a control end, the control end of the second switching tube is connected with a second reference voltage signal, and the first end of the second switching tube is connected with a third end of the buck transistor;
the power switch tube comprises a first end, a second end and a control end;
the third switching tube comprises a first end, a second end and a control end, and the control end of the third switching tube is connected with the output end of the control module and is used for receiving the first control signal; the first end of the third switching tube is connected with the second end of the second switching tube, and the second end of the third switching tube is connected with the control end of the power switching tube;
the fourth switching tube comprises a first end, a second end and a control end, and the control end of the fourth switching tube is connected with the output end of the control module and is used for receiving the second control signal; the first end of the fourth switching tube is connected with the control end of the power switching tube, and the second end of the fourth switching tube is grounded.
Optionally, the chip power supply circuit further includes:
one end of the first buffer is connected with the output end of the control module, the other end of the first buffer is connected with the control end of the third switching tube, and the output end of the control module is connected with the control end of the third switching tube through the first buffer;
and one end of the second buffer is connected with the output end of the control module, the other end of the second buffer is connected with the control end of the fourth switching tube, and the output end of the control module is connected with the control end of the fourth switching tube through the second buffer.
Optionally, the chip power supply circuit further comprises a freewheel circuit, one end of the freewheel circuit is connected with the input voltage, and the other end of the freewheel circuit is connected with the first end of the power switch tube.
Optionally, the freewheel circuit includes:
one end of the inductor is connected with the input voltage, and the other end of the inductor is connected with the first end of the power switch tube;
and the anode of the diode is connected with the first end of the power switch tube, and the cathode of the diode is connected with the input voltage.
Optionally, the chip power supply circuit further includes a sampling resistor, one end of the sampling resistor is connected with the second end of the power switch tube, and the other end of the sampling resistor is grounded.
Optionally, the step-down transistor, the control module, the first switching tube, the second switching tube, the third switching tube, the fourth switching tube, the power switching tube, the freewheel circuit and the sampling resistor are all integrated in the same chip.
Optionally, the step-down transistor includes a high withstand voltage transistor, and a withstand voltage of the step-down transistor is 500 v or more.
Optionally, the buck transistor comprises a junction field effect transistor.
Optionally, the first reference voltage signal is generated by a zener diode or is generated based on a bandgap reference voltage; the second reference voltage signal is generated by a zener diode or based on a bandgap reference voltage.
Optionally, the buck transistor includes an N-type junction field effect transistor, a gate of the buck transistor is grounded, and a drain of the buck transistor is connected with the input voltage;
the power switch tube comprises an NMOS transistor;
the first switching tube comprises an NMOS transistor, the grid electrode of the first switching tube is connected with the first reference voltage signal, the drain electrode of the first switching tube is connected with the source electrode of the step-down transistor, and the source electrode of the first switching tube is connected with the input end of the control module;
the second switching tube comprises an NMOS transistor, the grid electrode of the second switching tube is connected with the second reference voltage signal, and the drain electrode of the second switching tube is connected with the source electrode of the step-down transistor;
the third switching tube comprises an NMOS transistor, the grid electrode of the third switching tube is connected with the output end of the control module, the drain electrode of the third switching tube is connected with the source electrode of the second switching tube, and the source electrode of the third switching tube is connected with the grid electrode of the power switching tube;
the fourth switching tube comprises an NMOS transistor, the grid electrode of the fourth switching tube is connected with the output end of the control module, the drain electrode of the fourth switching tube is connected with the grid electrode of the power switching tube, and the source electrode of the fourth switching tube is grounded.
As described above, the chip power supply circuit of the present invention has the following advantageous effects:
according to the chip power supply circuit, the first end of the second switching tube is directly connected with the buck transistor, and the second switching tube can directly obtain enough driving current from the buck transistor to drive the power switching tube, so that the reliability and the efficiency of a system are ensured, and meanwhile, an energy storage capacitor is not required to be additionally arranged, and the cost of the system is reduced; the second switching tube is used for independently supplying power to the power switching tube, and the first switching tube which supplies power to the control module is isolated from the third switching tube, the fourth switching tube and the power switching tube, so that the interference to the control module is reduced.
Drawings
Fig. 1 shows a circuit diagram of a chip power supply circuit provided by the invention.
Description of element reference numerals
20. Step-down transistor
21. Control module
22. First switch tube
23. Second switch tube
24. Third switch tube
25. Fourth switching tube
26. Power switch tube
271. First buffer
272. Second buffer
28. Follow current circuit
281. Inductance
282. Diode
29. Sampling resistor
Detailed Description
Further advantages and effects of the present invention will become apparent to those skilled in the art from the disclosure of the present invention, which is described by the following specific examples.
Please refer to fig. 1. It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the invention to the extent that it can be practiced, since modifications, changes in the proportions, or otherwise, used in the practice of the invention, are not intended to be critical to the essential characteristics of the invention, but are intended to fall within the spirit and scope of the invention. Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like recited in the present specification are merely for descriptive purposes and are not intended to limit the scope of the invention, but are intended to provide relative positional changes or modifications without materially altering the technical context in which the invention may be practiced.
Referring to fig. 1, the present invention provides a chip power circuit, which includes: the switching device comprises a step-down transistor 20, a control module 21, a first switching tube 22, a second switching tube 23, a third switching tube 24, a fourth switching tube 25 and a power switching tube 26; wherein the buck transistor 20 includes a first end, a second end and a third end, the first end of the buck transistor 20 is connected with the input voltage Vin, and the second end of the buck transistor 20 is grounded; the buck transistor 20 is configured to regulate the input voltage Vin from a high voltage to a voltage that can be borne by the first switching tube 22 and the second switching tube 23; the first switching tube 22 includes a first end, a second end and a control end, the control end of the first switching tube 22 is connected with a first reference voltage signal VREF1, and the first end of the first switching tube 22 is connected with a third end of the buck transistor 20; the first switching tube 22 is configured to convert the received voltage output by the buck transistor 20 into an operating voltage VCC based on the first reference voltage signal VREF1, and provide the operating voltage VCC to the control module 21; the control module 21 comprises an input end, an output end and a grounding end, the input end of the control module 21 is connected with the second end of the first switch tube 22, and the grounding end of the control module 21 is grounded; the control module 21 is configured to generate a first control signal and a second control signal, where the first control signal and the second control signal are output through an output end of the control module 21; the second switching tube 23 includes a first end, a second end and a control end, the control end of the second switching tube 23 is connected with a second reference voltage signal VREF2, and the first end of the second switching tube 23 is connected with a third end of the buck transistor 20; the second switching transistor 23 is configured to convert the voltage output by the buck transistor 20 into a driving voltage based on the second reference voltage signal VREF2 and output the driving voltage to the third switching transistor 24; the power switch tube 26 comprises a first end, a second end and a control end; the third switching tube 24 includes a first end, a second end, and a control end, where the control end of the third switching tube 24 is connected to the output end of the control module 21, and is configured to receive the first control signal; the first end of the third switching tube 24 is connected with the second end of the second switching tube 23, and the second end of the third switching tube 24 is connected with the control end of the power switching tube 26; the fourth switching tube 25 includes a first end, a second end, and a control end, where the control end of the fourth switching tube 25 is connected to the output end of the control module 21, and is configured to receive the second control signal; the first end of the fourth switching tube 25 is connected to the control end of the power switching tube 26, and the second end of the fourth switching tube 25 is grounded. According to the chip power supply circuit, the first end of the second switching tube 23 is directly connected with the buck transistor 20, and the second switching tube 23 can directly obtain enough driving current from the buck transistor 20 to drive the power switching tube 26, so that the reliability and efficiency of a system are ensured, and meanwhile, an energy storage capacitor is not required to be additionally arranged, and the cost of the system is reduced; the second switching tube 23 independently supplies power to the power switching tube 26, and isolates the first switching tube 22, the third switching tube 24, the fourth switching tube 25 and the power switching tube 26, which supply power to the control module 21, so that the interference to the control module 21 is reduced.
The chip power supply circuit further includes: a first buffer 271, one end of the first buffer 271 is connected with the output end of the control module 21, the other end is connected with the control end of the third switch tube 24, and the output end of the control module 21 is connected with the control end of the third switch tube 24 through the first buffer 271; the first buffer 271 is configured to buffer the first control signal to form a first buffered control signal logic1, and output the first buffered control signal logic1 to the control end of the third switching tube 24; one end of the second buffer 272 is connected with the output end of the control module 21, the other end of the second buffer 272 is connected with the control end of the fourth switch tube 25, and the output end of the control module 21 is connected with the control end of the fourth switch tube 25 through the second buffer 272; the second buffer 272 is configured to buffer the second control signal to form a second buffered control signal logic2, and output the second buffered control signal logic2 to the fourth switching tube 25.
As an example, the chip power supply circuit further includes a freewheel circuit 28, one end of the freewheel circuit 28 is connected to the input voltage Vin, and the other end is connected to the first end of the power switch tube 26, that is, the first end of the power switch tube 26 is connected to the input voltage Vin via the freewheel circuit 28.
As an example, the freewheel circuit 28 includes: an inductor 281, wherein one end of the inductor 281 is connected with the input voltage Vin, and the other end of the inductor 281 is connected with the first end of the power switch tube 26; and a diode 282, wherein an anode of the diode 282 is connected with the first end of the power switch tube 26, and a cathode of the diode 282 is connected with the input voltage Vin.
The freewheel circuit 28 is not limited to the above configuration, and any freewheel circuit 28 may be applied to the chip power supply circuit.
As an example, the chip power supply circuit further includes a sampling resistor 29, one end of the sampling resistor 29 is connected to the second end of the power switch tube 26, and the other end of the sampling resistor 29 is grounded.
As an example, the buck transistor 20, the control module 21, the first switching tube 22, the second switching tube 23, the third switching tube 24, the fourth switching tube 25, the power switching tube 26, the first buffer 271, the second buffer 272, the freewheel circuit 28 and the sampling resistor 29 are integrated in the same chip (not shown).
As an example, since the step-down transistor 20 is directly connected to the input voltage Vin, and the voltage of the input voltage Vin is high, the step-down transistor 20 needs to include a high withstand voltage device, and the withstand voltage of the step-down transistor 20 may be set according to actual needs, but at least the withstand voltage of the step-down transistor 20 is ensured to be greater than the magnitude of the input voltage Vin, preferably, the withstand voltage of the step-down transistor 20 may be greater than or equal to 500 v.
As an example, the buck transistor 20 may include a junction field effect transistor (jfet transistor).
As an example, the first reference voltage signal VREF1 may be generated by a zener diode or generated based on a bandgap reference voltage; the second reference voltage signal VREF2 may be generated by a zener diode or based on a bandgap reference voltage.
As an example, the buck transistor 20 includes an N-type junction field effect transistor, the drain of the buck transistor 20 is the first end of the buck transistor 20, the source of the buck transistor 20 is the third end of the buck transistor 20, and the gate of the buck transistor 20 is the second end of the buck transistor 20; namely, the gate of the buck transistor 20 is grounded, and the drain of the buck transistor 20 is connected with the input voltage Vin; the power switch tube 26 includes an NMOS transistor, a gate of the power switch tube 26 is a control end of the power switch tube 26, a drain of the power switch tube 26 is a first end of the power switch tube 26, and a source of the power switch tube 26 is a second end of the power switch tube 26; the first switch tube 22 includes an NMOS transistor, a gate of the first switch tube 22 is a control end of the first switch tube 22, a drain of the first switch tube 22 is a first end of the first switch tube 22, a source of the first switch tube 22 is a second end of the first switch tube 22, that is, the gate of the first switch tube 22 is connected with the first reference voltage signal VREF1, a drain of the first switch tube 22 is connected with a source of the buck transistor 20, and the source of the first switch tube 22 is connected with an input end of the control module 21; the second switching tube 23 includes an NMOS transistor, a gate of the second switching tube 23 is a control end of the second switching tube 23, a drain of the second switching tube 23 is a first end of the second switching tube 23, a source of the second switching tube 23 is a second end of the second switching tube 23, that is, the gate of the second switching tube 23 is connected with the second reference voltage signal VREF2, and the drain of the second switching tube 23 is connected with the source of the step-down transistor 20; the third switching tube 24 includes an NMOS transistor, a gate of the third switching tube 24 is a control end of the third switching tube 24, a drain of the third switching tube 24 is a first end of the third switching tube 24, a source of the third switching tube 24 is a second end of the third switching tube 24, that is, the gate of the third switching tube 24 is connected to the output end of the control module 21 via the first buffer 271, a drain of the third switching tube 24 is connected to a source of the second switching tube 23, and a source of the third switching tube 24 is connected to a gate of the power switching tube 26; the fourth switch tube 25 includes an NMOS transistor, a gate of the fourth switch tube 25 is a control end of the fourth switch tube 25, a drain of the fourth switch tube 25 is a first end of the fourth switch tube 25, a source of the fourth switch tube 25 is a second end of the fourth switch tube 25, that is, the gate of the fourth switch tube 25 is connected with an output end of the control module 21, the drain of the fourth switch tube 25 is connected with a gate of the power switch tube 26, and the source of the fourth switch tube 25 is grounded.
According to the chip power supply circuit, the first end of the second switching tube 23 is directly connected with the buck transistor 20, and the second switching tube 23 can directly obtain enough driving current from the buck transistor 20 to drive the power switching tube 26, so that the reliability and efficiency of a system are ensured, and meanwhile, an energy storage capacitor is not required to be additionally arranged, and the cost of the system is reduced; the second switching tube 23 independently supplies power to the power switching tube 26, and isolates the first switching tube 22, the third switching tube 24, the fourth switching tube 25 and the power switching tube 26, which supply power to the control module 21, so that the interference to the control module 21 is reduced.
In summary, the present invention provides a chip power supply circuit, which includes: the switching device comprises a step-down transistor, a control module, a first switching tube, a second switching tube, a third switching tube, a fourth switching tube and a power switching tube; the buck transistor comprises a first end, a second end and a third end, wherein the first end of the buck transistor is connected with an input voltage, and the second end of the buck transistor is grounded; the first switching tube comprises a first end, a second end and a control end, the control end of the first switching tube is connected with a first reference voltage signal, and the first end of the first switching tube is connected with a third end of the buck transistor; the control module comprises an input end, an output end and a grounding end, wherein the input end of the control module is connected with the second end of the first switch tube, and the grounding end of the control module is grounded; the control module is used for generating a first control signal and a second control signal and outputting the first control signal and the second control signal through the output end of the control module; the second switching tube comprises a first end, a second end and a control end, the control end of the second switching tube is connected with a second reference voltage signal, and the first end of the second switching tube is connected with a third end of the buck transistor; the power switch tube comprises a first end, a second end and a control end; the third switching tube comprises a first end, a second end and a control end, and the control end of the third switching tube is connected with the output end of the control module and is used for receiving the first control signal; the first end of the third switching tube is connected with the second end of the second switching tube, and the second end of the third switching tube is connected with the control end of the power switching tube; the fourth switching tube comprises a first end, a second end and a control end, and the control end of the fourth switching tube is connected with the output end of the control module and is used for receiving the second control signal; the first end of the fourth switching tube is connected with the grid electrode of the power switching tube, and the second end of the fourth switching tube is grounded. According to the chip power supply circuit, the first end of the second switching tube is directly connected with the buck transistor, and the second switching tube can directly obtain enough driving current from the buck transistor to drive the power switching tube, so that the reliability and the efficiency of a system are ensured, and meanwhile, an energy storage capacitor is not required to be additionally arranged, and the cost of the system is reduced; the second switching tube is used for independently supplying power to the power switching tube, and the first switching tube which supplies power to the control module is isolated from the third switching tube, the fourth switching tube and the power switching tube, so that the interference to the control module is reduced.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (9)
1. A chip power circuit, the chip power circuit comprising: the switching device comprises a step-down transistor, a control module, a first switching tube, a second switching tube, a third switching tube, a fourth switching tube and a power switching tube; wherein, the liquid crystal display device comprises a liquid crystal display device,
the buck transistor comprises a first end, a second end and a third end, wherein the first end of the buck transistor is connected with an input voltage, and the second end of the buck transistor is grounded;
the first switching tube comprises a first end, a second end and a control end, the control end of the first switching tube is connected with a first reference voltage signal, the first end of the first switching tube is connected with a third end of the buck transistor, the first switching tube converts the received voltage output by the buck transistor into working voltage based on the first reference voltage signal and provides the working voltage for the control module, and the first reference voltage signal is generated through a zener diode or is generated based on a band gap reference voltage;
the control module comprises an input end, an output end and a grounding end, wherein the input end of the control module is connected with the second end of the first switch tube, and the grounding end of the control module is grounded; the control module is used for generating a first control signal and a second control signal and outputting the first control signal and the second control signal through the output end of the control module;
the second switching tube comprises a first end, a second end and a control end, the control end of the second switching tube is connected with a second reference voltage signal, the first end of the second switching tube is connected with a third end of the buck transistor, the second switching tube converts the voltage output by the buck transistor into a driving voltage based on the second reference voltage signal and outputs the driving voltage to the third switching tube, and the second reference voltage signal is generated through a zener diode or is generated based on a band gap reference voltage; the first end of the second switching tube is directly connected with the buck transistor, and the second switching tube directly obtains enough driving current from the buck transistor to drive the power switching tube, so that the reliability and the efficiency of a system are ensured, and an energy storage capacitor is not required to be additionally arranged; the second switching tube is used for independently supplying power to the power switching tube, and the first switching tube, the third switching tube, the fourth switching tube and the power switching tube which supply power to the control module are isolated, so that the interference to the control module is reduced;
the power switch tube comprises a first end, a second end and a control end;
the third switching tube comprises a first end, a second end and a control end, and the control end of the third switching tube is connected with the output end of the control module and is used for receiving the first control signal; the first end of the third switching tube is connected with the second end of the second switching tube, and the second end of the third switching tube is connected with the control end of the power switching tube;
the fourth switching tube comprises a first end, a second end and a control end, and the control end of the fourth switching tube is connected with the output end of the control module and is used for receiving the second control signal; the first end of the fourth switching tube is connected with the control end of the power switching tube, and the second end of the fourth switching tube is grounded.
2. The chip power supply circuit of claim 1, wherein the chip power supply circuit further comprises:
one end of the first buffer is connected with the output end of the control module, the other end of the first buffer is connected with the control end of the third switching tube, and the output end of the control module is connected with the control end of the third switching tube through the first buffer;
and one end of the second buffer is connected with the output end of the control module, the other end of the second buffer is connected with the control end of the fourth switching tube, and the output end of the control module is connected with the control end of the fourth switching tube through the second buffer.
3. The chip power supply circuit of claim 1, further comprising a freewheel circuit having one end connected to the input voltage and another end connected to the first end of the power switch tube.
4. A chip power supply circuit according to claim 3, wherein the freewheel circuit comprises:
one end of the inductor is connected with the input voltage, and the other end of the inductor is connected with the first end of the power switch tube;
and the anode of the diode is connected with the first end of the power switch tube, and the cathode of the diode is connected with the input voltage.
5. The chip power supply circuit of claim 3, further comprising a sampling resistor, wherein one end of the sampling resistor is connected to the second end of the power switch tube, and the other end of the sampling resistor is grounded.
6. The chip power supply circuit of claim 5, wherein the buck transistor, the control module, the first switching tube, the second switching tube, the third switching tube, the fourth switching tube, the power switching tube, the freewheel circuit, and the sampling resistor are all integrated within the same chip.
7. The chip power supply circuit according to claim 1, wherein the step-down transistor includes a high withstand voltage transistor, and a withstand voltage of the step-down transistor is 500 v or more.
8. The chip power supply circuit of claim 7 wherein the buck transistor comprises a junction field effect transistor.
9. The chip power supply circuit according to any one of claims 1 to 8, wherein,
the step-down transistor comprises an N-type junction field effect transistor, the grid electrode of the step-down transistor is grounded, and the drain electrode of the step-down transistor is connected with the input voltage;
the power switch tube comprises an NMOS transistor;
the first switching tube comprises an NMOS transistor, the grid electrode of the first switching tube is connected with the first reference voltage signal, the drain electrode of the first switching tube is connected with the source electrode of the step-down transistor, and the source electrode of the first switching tube is connected with the input end of the control module;
the second switching tube comprises an NMOS transistor, the grid electrode of the second switching tube is connected with the second reference voltage signal, and the drain electrode of the second switching tube is connected with the source electrode of the step-down transistor;
the third switching tube comprises an NMOS transistor, the grid electrode of the third switching tube is connected with the output end of the control module, the drain electrode of the third switching tube is connected with the source electrode of the second switching tube, and the source electrode of the third switching tube is connected with the grid electrode of the power switching tube;
the fourth switching tube comprises an NMOS transistor, the grid electrode of the fourth switching tube is connected with the output end of the control module, the drain electrode of the fourth switching tube is connected with the grid electrode of the power switching tube, and the source electrode of the fourth switching tube is grounded.
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| CN204131481U (en) * | 2014-09-16 | 2015-01-28 | 广东易事特电源股份有限公司 | The low-loss high speed push-pull driver circuit of low cost |
| CN109194110A (en) * | 2018-10-12 | 2019-01-11 | 北京动力机械研究所 | The charging of heavy-duty motor drive control device and electrifying timing sequence circuit |
| CN109194145A (en) * | 2018-10-23 | 2019-01-11 | 阳光电源股份有限公司 | It recommends the driving circuit of Switching Power Supply and recommends Switching Power Supply |
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| CN111799991A (en) | 2020-10-20 |
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