CN203911883U - Driving circuit of switch element - Google Patents
Driving circuit of switch element Download PDFInfo
- Publication number
- CN203911883U CN203911883U CN201420335759.0U CN201420335759U CN203911883U CN 203911883 U CN203911883 U CN 203911883U CN 201420335759 U CN201420335759 U CN 201420335759U CN 203911883 U CN203911883 U CN 203911883U
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- resistance
- triode
- switching device
- switch element
- resistor
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Abstract
The utility model discloses a driving circuit of a switch element. The driving circuit comprises a first triode, a second triode, a third triode, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor and a sixth resistor. The driving circuit is simple in structure, has small loss, is reliable in working and is especially suitable to be used for driving of MOSFET and IGBT. At the moment when the switch element is opened, the driving circuit can provide enough large charging current, the voltage of the control end of the switch element rises to the required value rapidly, and that the switch element can be opened rapidly is ensured. During opening of the switch element, the voltage of the control end of the switch element can be ensured to keep stable and reliable connection is carried out. At the moment when the switch element is turned off, a passage with an impedance as low as possible is provided for rapid discharge of capacitance charges among grids and that the switch element can be turned off rapidly is ensured. In addition, the driving circuit is low in cost, and is suitable to be applied in low-cost driving occasions of a switch element.
Description
Technical field
The utility model relates to electric and electronic technical field, particularly a kind of drive circuit of switching device.
Background technology
The switching device such as MOSFET and IGBT is more and more extensive in electric and electronic technical field application, and the quality of its drive circuit directly affects reliability and the performance index of switching device work.
The drive circuit of switching device has following requirement:
(1) the opening moment of switching device, require drive circuit that the larger peak current of charging in short-term can be provided, ensure that switching device can be open-minded fast;
(2) in the conducting moment of switching device, require drive circuit that stable control voltage can be provided, ensure reliably conducting of switching device;
(3) at the shutdown moment of switching device, require drive circuit can provide a low-impedance as far as possible path to release fast for capacitance charge between grid, ensure that switching device can turn-off fast.
Meanwhile, in applications such as some household electrical appliances, cost becomes an important Consideration, therefore, seems particularly important for switching device provides drive circuit simple and reliable, that loss is little, cost is low.
Summary of the invention
The utility model is intended to realize simply for switching device provides a kind of, cost is low, the drive circuit of reliable operation.
The utility model is achieved through the following technical solutions.
A drive circuit for switching device, comprises the first triode, the second triode, the 3rd triode, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance.
Described the first triode is NPN type triode, and described the second triode, described the 3rd triode are positive-negative-positive triode;
One end of described the first resistance is as the receiving terminal that receives pwm signal, the other end of described the first resistance is connected with the base stage of the first triode, the collector electrode of described the first triode is connected with one end of described the second resistance, one end of described the 4th resistance, and the other end of described the 4th resistance is connected with the base stage of described the second triode; The other end of described the second resistance, the emitter of described the second triode and driving power supply VCC are connected, the collector electrode of described the second triode is connected with one end of the base stage of described the 3rd triode, described the 3rd resistance, one end of described the 5th resistance, the other end of described the 5th resistance is connected with one end of described the 6th resistance, the control end of switching device, and the other end of described the 6th resistance is connected with the emitter of described the 3rd triode; The emitter of described the first triode, the other end of described the 3rd resistance, described the 3rd collector electrode of triode and the common port of switching device are connected.
Also comprise the first diode, the anode of described the first diode is connected with one end of described the 5th resistance, and the negative electrode of described the first diode is connected with one end of described the 6th resistance, the control end of described switching device.
Also comprise the 7th resistance, the 8th resistance, one end of described the 7th resistance is connected with the base stage of described the first triode, and the other end of described the 7th resistance is connected with the emitter of described the first triode.One end of described the 8th resistance is connected with the negative electrode of described the first diode, one end of described the 6th resistance, and described the 8th other end of resistance and the common port of described switching device are connected.
Described switching device is MOSFET or IGBT.
In the drive circuit of a kind of switching device that the utility model provides, opening moment of switching device, drive power supply VCC to provide a quick charge passage by the second triode, the 5th resistance, the first diode for switching device, make the control end voltage of switching device increase rapidly, ensure that switching device can be open-minded fast, the 5th resistance rises opens metering function; At the shutdown moment of switching device, the 3rd triode, the 6th resistance R 6 provide a low-impedance as far as possible path for switching device, the control end electric charge of switching device is released fast, ensure that switching device can turn-off fast, the 6th resistance plays cut-off current-limiting effect.
Circuit structure of the present utility model is simple, and loss is little, reliable operation.Open instantaneously at switching device, the drive circuit that the utility model provides can provide the control end voltage that enough large charging current makes switching device to rise to rapidly desirable value, ensures that switching device can be open-minded fast; The control end voltage that can ensure switching device during switching device is opened keeps stable its reliable conducting that makes; Can provide a low-impedance as far as possible path to release fast for capacitance charge between grid at the shutdown moment of switching device, ensure that switching device can turn-off fast.
Brief description of the drawings
Below in conjunction with drawings and Examples, the utility model is described in further detail:
Fig. 1 be a kind of switching device of the present utility model drive circuit realize schematic diagram.
Embodiment
By reference to the accompanying drawings the utility model is elaborated.
Fig. 1 be a kind of switching device of the present utility model drive circuit realize schematic diagram.
A drive circuit for switching device, comprises the first triode Q1, the second triode Q2, the 3rd triode Q3, the first resistance R 1, the second resistance R 2, the 3rd resistance R 2, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6.
Switching device VT1 in the present embodiment is IGBT.
The first triode Q1 is NPN type triode, and the second triode Q2, the 3rd triode Q3 are positive-negative-positive triode;
One end of the first resistance R 1 is as the receiving terminal that receives pwm signal, the other end of the first resistance R 1 is connected with the base stage of the first triode Q1, the collector electrode of the first triode Q1 is connected with one end of the second resistance R 2, one end of the 4th resistance R 4, and the other end of the 4th resistance R 4 is connected with the base stage of the second triode Q2.The other end of the second resistance R 2, the emitter of the second triode Q2 and driving power supply VCC are connected, the collector electrode of the second triode Q2 is connected with the base stage of the 3rd triode Q2, one end of the 3rd resistance R 3, one end of the 5th resistance R 5, the other end of the 5th resistance R 5 is connected with one end of the 6th resistance R 6, the grid of switching device VT1, and the other end of the 6th resistance R 6 is connected with the emitter of the 3rd triode Q3.The collector electrode of the emitter of the first triode Q1, the other end of the 3rd resistance R 3, the 3rd triode Q3 is connected with the emitter of switching device VT1.
Also comprise the first diode D1, the anode of the first diode D1 is connected with one end of the 5th resistance R 5, and the negative electrode of the first diode D1 is connected with one end of the 6th resistance R 6, the grid of switching device VT1.
The one end that also comprises the 7th resistance R 7, the 8th resistance R 8, the seven resistance R 7 is connected with the base stage of the first triode Q1, and the other end of the 7th resistance R 7 is connected with the emitter of the first triode Q1.One end of the 8th resistance R 8 is connected with the negative electrode of the first diode D1, one end of the 6th resistance R 6, the grid of switching device VT1, and one end of the 8th resistance R 8 is connected with the emitter of switching device VT1.
Above embodiment is the restriction in order to the technical solution of the utility model to be described but not to the utility model protection range only; although the utility model is explained in detail with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can modify or be equal to replacement the technical solution of the utility model, and not depart from essence and the scope of technical solutions of the utility model.
Claims (4)
1. a drive circuit for switching device, comprises the first triode, the second triode, the 3rd triode, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, it is characterized in that:
Described the first triode is NPN type triode, and described the second triode, described the 3rd triode are positive-negative-positive triode;
One end of described the first resistance is as the receiving terminal that receives pwm signal, the other end of described the first resistance is connected with the base stage of the first triode, the collector electrode of described the first triode is connected with one end of described the second resistance, one end of described the 4th resistance, and the other end of described the 4th resistance is connected with the base stage of described the second triode; The other end of described the second resistance, the emitter of described the second triode and driving power supply are connected, the collector electrode of described the second triode is connected with one end of the base stage of described the 3rd triode, described the 3rd resistance, one end of described the 5th resistance, the other end of described the 5th resistance is connected with one end of described the 6th resistance, the control end of switching device, and the other end of described the 6th resistance is connected with the emitter of described the 3rd triode; The emitter of described the first triode, the other end of described the 3rd resistance, described the 3rd collector electrode of triode and the common port of switching device are connected.
2. the drive circuit of a kind of switching device according to claim 1, it is characterized in that: also comprise the first diode, the anode of described the first diode is connected with one end of described the 5th resistance, and the negative electrode of described the first diode is connected with one end of described the 6th resistance, the control end of described switching device.
3. the drive circuit of a kind of switching device according to claim 1, it is characterized in that: also comprise the 7th resistance, the 8th resistance, one end of described the 7th resistance is connected with the base stage of described the first triode, and the other end of described the 7th resistance is connected with the emitter of described the first triode; One end of described the 8th resistance is connected with the negative electrode of described the first diode, one end of described the 6th resistance, and described the 8th other end of resistance and the common port of described switching device are connected.
4. the drive circuit of a kind of switching device according to claim 1, is characterized in that: described switching device is MOSFET or IGBT.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420335759.0U CN203911883U (en) | 2014-06-23 | 2014-06-23 | Driving circuit of switch element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420335759.0U CN203911883U (en) | 2014-06-23 | 2014-06-23 | Driving circuit of switch element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203911883U true CN203911883U (en) | 2014-10-29 |
Family
ID=51786125
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420335759.0U Expired - Fee Related CN203911883U (en) | 2014-06-23 | 2014-06-23 | Driving circuit of switch element |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203911883U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110620374A (en) * | 2019-10-11 | 2019-12-27 | 杭州兆鼎科技实业有限公司 | Regenerated electromotive force relief device |
| CN111342824A (en) * | 2020-05-19 | 2020-06-26 | 佛山市联动科技股份有限公司 | High-current fast electronic switch |
| WO2022000596A1 (en) * | 2020-06-29 | 2022-01-06 | 深圳市华思旭科技有限公司 | Switch circuit and electric apparatus |
-
2014
- 2014-06-23 CN CN201420335759.0U patent/CN203911883U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110620374A (en) * | 2019-10-11 | 2019-12-27 | 杭州兆鼎科技实业有限公司 | Regenerated electromotive force relief device |
| CN111342824A (en) * | 2020-05-19 | 2020-06-26 | 佛山市联动科技股份有限公司 | High-current fast electronic switch |
| WO2022000596A1 (en) * | 2020-06-29 | 2022-01-06 | 深圳市华思旭科技有限公司 | Switch circuit and electric apparatus |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141029 Termination date: 20150623 |
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| EXPY | Termination of patent right or utility model |