CN111799993A - Driving circuit - Google Patents
Driving circuit Download PDFInfo
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- CN111799993A CN111799993A CN201910274717.8A CN201910274717A CN111799993A CN 111799993 A CN111799993 A CN 111799993A CN 201910274717 A CN201910274717 A CN 201910274717A CN 111799993 A CN111799993 A CN 111799993A
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- Prior art keywords
- switch tube
- control module
- power switch
- control
- input voltage
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The present invention provides a driving circuit, including: the control module, a first switch tube, a second switch tube and a power switch tube; the input end of the control module is connected with an input voltage, and the grounding end of the control module is grounded; the control end of the first switching tube is connected with the output end of the control module; the first end of the first switch tube is connected with an input voltage, and the second end of the first switch tube is connected with the control end of the power switch tube; the control end of the second switching tube is connected with the output end of the control module; the first end of the second switch tube is connected with the grid electrode of the power switch tube, and the second end of the second switch tube is grounded. According to the driving circuit, the first end of the first switching tube is directly connected with the input voltage, the first switching tube can directly obtain enough driving current from the input voltage to drive the power switching tube, the reliability and the efficiency of a system are guaranteed, meanwhile, an additional energy storage capacitor is not needed, 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 driving circuit.
Background
For a switching power supply system, a power switching tube needs to be driven in operation, and at the moment of driving the power switching tube, enough driving current needs to be provided for a grid electrode of the power switching tube so as to meet the reliability and efficiency of the switching power supply system; therefore, an energy storage capacitor to the ground is required to be externally hung on a power supply pin of the switching power supply chip so as to ensure that the power switching tube has enough current driving capability at the driving moment. The extra 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 shortcomings of the prior art, the present invention provides a driving circuit for solving the problem of high cost caused by the need of additional energy storage capacitor in the prior art.
To achieve the above and other related objects, the present invention provides a driving circuit, including: the control module, a first switch tube, a second switch tube and a power switch tube; wherein the content of the first and second substances,
the control module comprises an input end, an output end and a grounding end, the input end of the control module is connected with an input voltage, 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 power switch tube comprises a first end, a second end and a control end;
the first switch tube comprises a first end, a second end and a control end, and the control end of the first switch tube is connected with the output end of the control module and used for receiving the first control signal; the first end of the first switch tube is connected with the input voltage, and the second end of the first switch tube is connected with the control end of the power switch tube; the first switch tube is used for providing a pull-up path for the power switch tube;
the second switch tube comprises a first end, a second end and a control end, and the control end of the second switch tube is connected with the output end of the control module and used for receiving the second control signal; the first end of the second switch tube is connected with the control end of the power switch tube, and the second end of the second switch tube is grounded; the second switch tube is used for providing a pull-down path for the power switch tube.
Optionally, the driving circuit further includes a follow current circuit, one end of the follow current circuit is connected to the input voltage, and the other end of the follow current circuit is connected to the first end of the power switch tube.
Optionally, 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.
Optionally, the driving circuit further includes a sampling resistor, 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.
Optionally, the control module, the power switch tube, the first switch tube, the second switch tube, the freewheeling circuit, and the sampling resistor are all integrated in the same chip.
Optionally, the first switching tube includes a high voltage withstanding device, and a withstand voltage of the first switching tube is greater than or equal to 500 v.
Optionally, the power switch tube comprises an NMOS transistor;
the first switch tube comprises an NMOS transistor, the grid electrode of the first switch tube is connected with the output end of the control module, the drain electrode of the first switch tube is connected with the input voltage, and the source electrode of the first switch tube is connected with the grid electrode of the power switch tube;
the second switch tube comprises an NMOS transistor, the grid electrode of the second switch tube is connected with the output end of the control module, the drain electrode of the second switch tube is connected with the grid electrode of the power switch tube, and the source electrode of the second switch tube is grounded.
As described above, the driving circuit of the present invention has the following advantageous effects:
according to the driving circuit, the first end of the first switching tube is directly connected with the input voltage, the first switching tube can directly obtain enough driving current from the input voltage to drive the power switching tube, the reliability and the efficiency of a system are guaranteed, meanwhile, an additional energy storage capacitor is not needed, and the cost of the system is reduced.
Drawings
Fig. 1 shows a circuit diagram of a driving circuit provided in the present invention.
Description of the element reference numerals
20 control module
21 first switch tube
22 second switch tube
23 power switch tube
24-free wheel circuit
241 inductance
242 diode
25 sampling resistor
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
Please refer to fig. 1. It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions under which the present invention can be implemented, so that the present invention has no technical significance, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
Referring to fig. 1, the present invention provides a driving circuit, which includes: the control module 20, the first switch tube 21, the second switch tube 22 and the power switch tube 23; the control module 20 comprises an input end, an output end and a ground end, the input end of the control module 20 is connected with the input voltage Vin, and the ground end of the control module 20 is grounded; the control module 20 is configured to generate a first control signal logic1 and a second control signal logic2, wherein the first control signal logic1 and the second control signal logic2 are output through an output terminal of the control module 20; the power switch tube 23 comprises a first end, a second end and a control end; the first switch tube 21 comprises a first end, a second end and a control end, the control end of the first switch tube 21 is connected to the output end of the control module 20, and is configured to receive the first control signal logic1, that is, the control end of the first switch tube 21 is controlled by the first control signal logic 1; a first end of the first switch tube 21 is connected to the input voltage Vin, and a second end of the first switch tube 21 is connected to a control end of the power switch tube 23; the first switch tube 21 is used for providing a pull-up path for the power switch tube 23; the second switch 22 comprises a first end, a second end and a control end, the control end of the second switch 22 is connected to the output end of the control module 20, and is configured to receive the second control signal logic2, that is, the control end of the second switch 22 is controlled by the second control signal logic 2; a first end of the second switch tube 22 is connected with a control end of the power switch tube 23, and a second end of the second switch tube 22 is grounded; the second switch tube 22 is used for providing a pull-down path for the power switch tube 23. According to the driving circuit, the first end of the first switch tube 21 is directly connected with the input voltage Vin, the first switch tube 21 can directly obtain enough driving current from the input voltage Vin to drive the power switch tube 23, the reliability and the efficiency of a system are guaranteed, an additional energy storage capacitor is not needed, and the cost of the system is reduced.
As an example, the driving circuit further includes a freewheeling circuit 24, where one end of the freewheeling circuit 24 is connected to the input voltage Vin, and the other end of the freewheeling circuit 24 is connected to the first end of the power switch 23, that is, the first end of the power switch 23 is connected to the input voltage Vin via the freewheeling circuit 24.
As an example, the freewheel circuit 24 includes: an inductor 241, one end of the inductor 241 is connected to the input voltage Vin, and the other end of the inductor 241 is connected to the first end of the power switch tube 23; and a diode 242, wherein an anode of the diode 242 is connected to the first end of the power switch tube 23, and a cathode of the diode 242 is connected to the input voltage Vin.
The flywheel circuit 24 is not limited to the above configuration, and any flywheel circuit 24 may be applied to the drive circuit.
As an example, the driving circuit further includes a sampling resistor 25, one end of the sampling resistor 25 is connected to the second end of the power switch tube 23, and the other end of the sampling resistor 25 is grounded.
As an example, the control module 20, the power switch 23, the first switch 21, the second switch 22, the freewheel circuit 24, and the sampling resistor 25 may all be integrated in a same chip (not shown).
As an example, since the first switch tube 21 is directly connected to the input voltage Vin, and the voltage of the input voltage Vin is higher, the first switch tube 21 needs to include a high voltage-resistant device, the voltage resistance of the first switch tube 21 can be set according to actual needs, but at least the voltage resistance of the first switch tube 21 is ensured to be larger than the magnitude of the input voltage Vin, and preferably, the voltage resistance of the first switch tube 21 can be greater than or equal to 500 v.
As an example, the power switch tube 23 may include an NMOS transistor, a gate of the power switch tube 23 is a control end of the power switch tube 23, a drain of the power switch tube 23 is a first end of the power switch tube 23, and a source of the power switch tube 23 is a second end of the power switch tube 23; the first switch tube 21 may include an NMOS transistor, a gate of the first switch tube 21 is a control end of the first switch tube 21, a drain of the first switch tube 21 is a first end of the first switch tube 21, a source of the first switch tube 21 is a second end of the first switch tube 21, that is, the gate of the first switch tube 21 is connected to an output end of the control module 20, the drain of the first switch tube 21 is connected to the input voltage Vin, and the source of the first switch tube 21 is connected to a gate of the power switch tube 23; the second switch tube 22 may include an NMOS transistor, a gate of the second switch tube 22 is a control end of the second switch tube 22, a drain of the second switch tube 22 is a first end of the second switch tube 22, a source of the second switch tube 22 is a second end of the second switch tube 22, that is, the gate of the second switch tube 22 is connected to an output end of the control module 20, the drain of the second switch tube 22 is connected to a gate of the power switch tube 23, and the source of the second switch tube 22 is grounded.
According to the driving circuit, the first end of the first switch tube 21 is directly connected with the input voltage Vin, the first switch tube 21 can directly obtain enough driving current from the input voltage Vin to drive the power switch tube 23, the reliability and the efficiency of a system are guaranteed, an additional energy storage capacitor is not needed, and the cost of the system is reduced.
In summary, the present invention provides a driving circuit, which includes: the control module, a first switch tube, a second switch tube and a power switch tube; 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 an input voltage, 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 power switch tube comprises a first end, a second end and a control end; the first switch tube comprises a first end, a second end and a control end, and the control end of the first switch tube is connected with the output end of the control module and used for receiving the first control signal; the first end of the first switch tube is connected with the input voltage, and the second end of the first switch tube is connected with the control end of the power switch tube; the first switch tube is used for providing a pull-up path for the power switch tube; the second switch tube comprises a first end, a second end and a control end, and the control end of the second switch tube is connected with the output end of the control module and used for receiving the second control signal; the first end of the second switch tube is connected with the control end of the power switch tube, and the second end of the second switch tube is grounded; the second switch tube is used for providing a pull-down path for the power switch tube. According to the driving circuit, the first end of the first switching tube is directly connected with the input voltage, the first switching tube can directly obtain enough driving current from the input voltage to drive the power switching tube, the reliability and the efficiency of a system are guaranteed, meanwhile, an additional energy storage capacitor is not needed, and the cost of the system is reduced.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (7)
1. A driver circuit, characterized in that the driver circuit comprises: the control module, a first switch tube, a second switch tube and a power switch tube; wherein the content of the first and second substances,
the control module comprises an input end, an output end and a grounding end, the input end of the control module is connected with an input voltage, 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 power switch tube comprises a first end, a second end and a control end;
the first switch tube comprises a first end, a second end and a control end, and the control end of the first switch tube is connected with the output end of the control module and used for receiving the first control signal; the first end of the first switch tube is connected with the input voltage, and the second end of the first switch tube is connected with the control end of the power switch tube; the first switch tube is used for providing a pull-up path for the power switch tube;
the second switch tube comprises a first end, a second end and a control end, and the control end of the second switch tube is connected with the output end of the control module and used for receiving the second control signal; the first end of the second switch tube is connected with the control end of the power switch tube, and the second end of the second switch tube is grounded; the second switch tube is used for providing a pull-down path for the power switch tube.
2. The driving circuit of claim 1, further comprising a freewheeling circuit connected to the input voltage at one end and to the first end of the power switch transistor at the other end.
3. The drive circuit of claim 2, 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.
4. The driving circuit of claim 2, 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.
5. The driving circuit of claim 4, wherein the control module, the power switch, the first switch, the second switch, the freewheel circuit, and the sampling resistor are all integrated in a same chip.
6. The driving circuit as claimed in claim 1, wherein the first switching tube comprises a high voltage withstanding device, and a withstand voltage of the first switching tube is greater than or equal to 500 v.
7. The drive circuit according to any one of claims 1 to 6,
the power switch tube comprises an NMOS transistor;
the first switch tube comprises an NMOS transistor, the grid electrode of the first switch tube is connected with the output end of the control module, the drain electrode of the first switch tube is connected with the input voltage, and the source electrode of the first switch tube is connected with the grid electrode of the power switch tube;
the second switch tube comprises an NMOS transistor, the grid electrode of the second switch tube is connected with the output end of the control module, the drain electrode of the second switch tube is connected with the grid electrode of the power switch tube, and the source electrode of the second switch tube is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910274717.8A CN111799993A (en) | 2019-04-08 | 2019-04-08 | Driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910274717.8A CN111799993A (en) | 2019-04-08 | 2019-04-08 | Driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111799993A true CN111799993A (en) | 2020-10-20 |
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ID=72805152
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910274717.8A Pending CN111799993A (en) | 2019-04-08 | 2019-04-08 | Driving circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111799993A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20010005152A1 (en) * | 1999-12-28 | 2001-06-28 | Nissan Motor Co., Ltd. | Drive circuit for semiconductor power device and semiconductor switching circuit using the drive circuit |
| 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 |
| 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 |
-
2019
- 2019-04-08 CN CN201910274717.8A patent/CN111799993A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20010005152A1 (en) * | 1999-12-28 | 2001-06-28 | Nissan Motor Co., Ltd. | Drive circuit for semiconductor power device and semiconductor switching circuit using the drive circuit |
| 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 |
| 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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| TA01 | Transfer of patent application right |
Effective date of registration: 20210114 Address after: 214135 -6, Linghu Avenue, Wuxi Taihu international science and Technology Park, Wuxi, Jiangsu, China, 180 Applicant after: China Resources micro integrated circuit (Wuxi) Co.,Ltd. Address before: 200040 2nd floor, No.11 and 12, Lane 299, Wenshui Road, Jing'an District, Shanghai Applicant before: CHINA RESOURCES POWTECH (SHANGHAI) Co.,Ltd. |
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Application publication date: 20201020 |
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