CN204668926U - A kind of IGBT drives and protective circuit - Google Patents
A kind of IGBT drives and protective circuit Download PDFInfo
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- CN204668926U CN204668926U CN201520415133.5U CN201520415133U CN204668926U CN 204668926 U CN204668926 U CN 204668926U CN 201520415133 U CN201520415133 U CN 201520415133U CN 204668926 U CN204668926 U CN 204668926U
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Abstract
The utility model belongs to driving and protective circuit technical field, provide a kind of IGBT to drive and protective circuit, comprise the first power end, second source end, first earth terminal, second earth terminal, 3rd earth terminal, control circuit, drive circuit, feedback circuit, failure output terminal and photoelectrical coupler, the pin 1 of described photoelectrical coupler, 4 are all connected with the first earth terminal, the pin 2 of described photoelectrical coupler, 6, 7 are all connected with the first power end, the pin 3 of described photoelectrical coupler connects failure output terminal, the pin 5 of described photoelectrical coupler, 8 are connected with the first power end with the first electric capacity by the first resistance of setting parallel with one another, because photoelectrical coupler has, integrated level is high, the advantage of good stability, thus drastically increase integrated level of the present utility model and stability, and when the phenomenon of output short-circuit appears in IGBT circuit, photoelectrical coupler can cut out output automatically, thus reliably protect the work of IGBT.
Description
Technical field
The utility model belongs to driving and protective circuit technical field, relates to a kind of IGBT and drives and protective circuit.
Background technology
IGBT (Insulated Gate Bipolar Transi stor) i.e. insulated gate bipolar transistor, the compound full-control type voltage driven type power semiconductor be made up of BJT (double pole triode) and MOS (insulating gate type field effect tube), has the advantage of the high input impedance of MOSFET and low conduction voltage drop two aspect of GTR concurrently.IGBT is widely used in device for power switching.
The more IGBT drive circuit of current use is built by discrete electronic component, and the components and parts of circuit are more, complex structure, poor stability.Once circuit breaks down, the components and parts that maintenance needs detect are many, workload large, have a strong impact on the normal operation of system.
Utility model content
The purpose of this utility model is the problems referred to above existed for prior art, proposes that a kind of first device is less, integrated level is high, good stability, the IGBT being convenient to keep in repair and safeguard drive and protective circuit.
The purpose of this utility model realizes by following technical proposal: a kind of IGBT drives and protective circuit, comprises the first power end, second source end, first earth terminal, second earth terminal, 3rd earth terminal, control circuit, drive circuit, feedback circuit, failure output terminal and photoelectrical coupler, the pin 1 of described photoelectrical coupler, 4 are all connected with the first earth terminal, the pin 2 of described photoelectrical coupler, 6, 7 are all connected with the first power end, and the pin 3 of described photoelectrical coupler connects failure output terminal, the pin 5 of described photoelectrical coupler, 8 are connected with the first power end with the first electric capacity by the first resistance of setting parallel with one another, the pin 9 of described photoelectrical coupler, 12 are all connected with the second earth terminal, the pin 13 of described photoelectrical coupler is connected with second source end and is connected with the 3rd earth terminal with the second electric capacity by the second resistance of setting parallel with one another, the pin 14 of described photoelectrical coupler is connected with the 3rd earth terminal by the 3rd electric capacity, the pin 16 of described photoelectrical coupler is connected with the 3rd earth terminal, be connected with the second earth terminal after described 3rd earth terminal is oppositely connected in series voltage stabilizing didoe, described control circuit, drive circuit and feedback circuit are all electrically connected with photoelectrical coupler.
In above-mentioned IGBT driving and protective circuit, described control circuit comprises control end and the 3rd resistance, and described control end is connected with the pin 5,8 of photoelectrical coupler by the 3rd resistance.
In above-mentioned IGBT driving and protective circuit; described drive circuit comprises output, the 4th resistance, the 5th resistance, the 4th electric capacity, the 6th resistance and compound voltage-stabiliser tube; described output is connected with the pin 10 of photoelectrical coupler; be connected with the pin 11 of photoelectrical coupler after described output serial connection the 4th resistance; be connected with the second earth terminal after the pin 11 of described photoelectrical coupler is connected in series the 5th resistance, described output is connected with the 3rd earth terminal with compound voltage-stabiliser tube by the 4th electric capacity of setting parallel with one another, the 6th resistance.
In above-mentioned IGBT driving and protective circuit; described feedback circuit comprises feedback end, the 7th resistance, the 8th resistance, the 9th resistance, the first diode and the second diode; described feedback end is oppositely connected in series the first diode successively and is connected with one end of the 9th resistance with after the second diode; the described other end of the 9th resistance is connected with the pin 14 of photoelectrical coupler, and the pin 14 of described photoelectrical coupler is connected in series the 7th resistance successively and is connected with the pin 11 of photoelectrical coupler with after the 8th resistance.
In above-mentioned IGBT driving and protective circuit, described first power end is connected by the 5th electric capacity with between the first earth terminal.
In above-mentioned IGBT driving and protective circuit, described photoelectrical coupler is ACPL-332J type photoelectrical coupler.
The course of work of the present utility model is as follows: control signal sends into the pin 5,8 of photoelectrical coupler through control circuit, and make photoelectrical coupler conducting, the pin 11 of photoelectrical coupler exports high level makes IGBT open through the 4th resistance, and motor obtains electric current entry into service; When output short-circuit, the saturation voltage drop of IGBT increases, and pin 14 voltage of photoelectrical coupler is more than 6.5V, and photoelectrical coupler cuts out automatically, thus protects IGBT.
Compared with prior art; the beneficial effects of the utility model are: by adopting photoelectrical coupler as core devices of the present utility model; because photoelectrical coupler has, integrated level is high, the advantage of good stability; thus drastically increase integrated level of the present utility model and stability; decrease the interference of circuit; reduce the complexity of maintenance, maintenance difficulties and circuit structure; and when the phenomenon of output short-circuit appears in IGBT circuit; photoelectrical coupler can cut out output automatically, thus reliably protects the work of IGBT.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present utility model.
In figure, 5V, the first power end; 26VB, second source end, DGND, the first earth terminal; SGND, the second earth terminal; GND, the 3rd earth terminal; U5, photoelectrical coupler; BR, control end; OUT1, output; IN, feedback end; OUT2, failure output terminal; R33, the first resistance; R163, the second resistance; R36, the 3rd resistance; R32, the 4th resistance; R35, the 5th resistance; R34, the 6th resistance; R29, the 7th resistance; R31, the 8th resistance; R28, the 9th resistance; C36, the first electric capacity; C32, the second electric capacity; C33, the 3rd electric capacity; C37, the 4th electric capacity; C31, the 5th electric capacity; D15, voltage stabilizing didoe; D14, the first diode; D13, the second diode; Z4, compound voltage-stabiliser tube.
Embodiment
Be below specific embodiment of the utility model and by reference to the accompanying drawings, the technical solution of the utility model is further described, but the utility model be not limited to these embodiments.
As shown in Figure 1, a kind of IGBT drives and protective circuit, comprises the first power end 5V, second source end 26VB, first earth terminal DGND, second earth terminal SGND, 3rd earth terminal GND, control circuit, drive circuit, feedback circuit, the pin 1 of failure output terminal OUT2 and photoelectrical coupler U5, photoelectrical coupler U5, 4 are all connected with the first earth terminal DGND, the pin 2 of photoelectrical coupler U5, 6, 7 are all connected with the first power end 5V, and the pin 3 of photoelectrical coupler U5 connects failure output terminal OUT2, the pin 5 of photoelectrical coupler U5, 8 are connected with the first power end 5V with the first electric capacity C36 by the first resistance R33 of setting parallel with one another, the pin 9 of photoelectrical coupler U5, 12 are all connected with the second earth terminal SGND, the pin 13 of photoelectrical coupler U5 is connected with second source end 26VB and is connected with the 3rd earth terminal GND with the second electric capacity C32 by the second resistance R163 of setting parallel with one another, the pin 14 of photoelectrical coupler U5 is connected with the 3rd earth terminal GND by the 3rd electric capacity C33, the pin 16 of photoelectrical coupler U5 is connected with the 3rd earth terminal GND, be connected with the second earth terminal SGND after 3rd earth terminal GND is oppositely connected in series voltage stabilizing didoe D15, control circuit, drive circuit and feedback circuit are all electrically connected with photoelectrical coupler U5.
In the utility model, the value of the second electric capacity C32 and the second resistance R163 directly affects the stability of photoelectrical coupler peripheral circuit.
The value of the second electric capacity C32 and the second resistance R163 meets following formula:
Wherein, R is the value of R163, and C is the value of C32, and t is IGBT ON time, V
1for IGBT pressure drop voltage, V
2be the first power end voltage, V
3for second source terminal voltage.
Control circuit comprises control end BR and the 3rd resistance R36, control end BR are connected with the pin 5,8 of photoelectrical coupler U5 by the 3rd resistance R36.
Drive circuit comprises output OUT1, the 4th resistance R32, the 5th resistance R35, the 4th electric capacity C37, the 6th resistance R34 and compound voltage-stabiliser tube Z4, output OUT1 is connected with the pin 10 of photoelectrical coupler U5, output OUT1 is connected with the pin 11 of photoelectrical coupler U5 after being connected in series the 4th resistance R32, be connected with the second earth terminal SGND after the pin 11 of electric coupling is connected in series the 5th resistance R35, output OUT1 is connected with the 3rd earth terminal GND with compound voltage-stabiliser tube Z4 by the 4th electric capacity C37, the 6th resistance R34 of setting parallel with one another.
Feedback circuit comprises feedback end IN, the 7th resistance R29, the 8th resistance R31, the 9th resistance R28, the first diode D14 and the second diode D13, feedback end IN is oppositely connected in series the first diode D14 successively and is connected with one end of the 9th resistance R28 with after the second diode D13, the other end of the 9th resistance R28 is connected with the pin 14 of photoelectrical coupler U5, and the pin 14 of photoelectrical coupler U5 is connected in series the 7th resistance R29 successively and is connected with the pin 11 of photoelectrical coupler U5 with after the 8th resistance R31.
Be connected by the 5th electric capacity C31 between first power end 5V with the first earth terminal DGND.
Photoelectrical coupler U5 is ACPL-332J type photoelectrical coupler U5.
Specific embodiment described herein is only to the explanation for example of the utility model spirit.The utility model person of ordinary skill in the field can make various amendment or supplements or adopt similar mode to substitute to described specific embodiment, but can't depart from spirit of the present utility model or surmount the scope that appended claims defines.
Claims (7)
1. IGBT drives and a protective circuit, it is characterized in that: comprise the first power end, second source end, first earth terminal, second earth terminal, 3rd earth terminal, control circuit, drive circuit, feedback circuit, failure output terminal and photoelectrical coupler, the pin 1 of described photoelectrical coupler, 4 are all connected with the first earth terminal, the pin 2 of described photoelectrical coupler, 6, 7 are all connected with the first power end, and the pin 3 of described photoelectrical coupler connects failure output terminal, the pin 5 of described photoelectrical coupler, 8 are connected with the first power end with the first electric capacity by the first resistance of setting parallel with one another, the pin 9 of described photoelectrical coupler, 12 are all connected with the second earth terminal, the pin 13 of described photoelectrical coupler is connected with second source end and is connected with the 3rd earth terminal with the second electric capacity by the second resistance of setting parallel with one another, the pin 14 of described photoelectrical coupler is connected with the 3rd earth terminal by the 3rd electric capacity, the pin 16 of described photoelectrical coupler is connected with the 3rd earth terminal, be connected with the second earth terminal after described 3rd earth terminal is oppositely connected in series voltage stabilizing didoe, described control circuit, drive circuit and feedback circuit are all electrically connected with photoelectrical coupler.
2. a kind of IGBT according to claim 1 drives and protective circuit, it is characterized in that: described control circuit comprises control end and the 3rd resistance, and described control end is connected with the pin 5,8 of photoelectrical coupler by the 3rd resistance.
3. a kind of IGBT according to claim 2 drives and protective circuit; it is characterized in that: described drive circuit comprises output, the 4th resistance, the 5th resistance, the 4th electric capacity, the 6th resistance and compound voltage-stabiliser tube; described output is connected with the pin 10 of photoelectrical coupler; be connected with the pin 11 of photoelectrical coupler after described output serial connection the 4th resistance; be connected with the second earth terminal after the pin 11 of described electric coupling is connected in series the 5th resistance, described output is connected with the 3rd earth terminal with compound voltage-stabiliser tube by the 4th electric capacity of setting parallel with one another, the 6th resistance.
4. a kind of IGBT according to claim 3 drives and protective circuit; it is characterized in that: described feedback circuit comprises feedback end, the 7th resistance, the 8th resistance, the 9th resistance, the first diode and the second diode; described feedback end is oppositely connected in series the first diode successively and is connected with one end of the 9th resistance with after the second diode; the described other end of the 9th resistance is connected with the pin 14 of photoelectrical coupler, and the pin 14 of described photoelectrical coupler is connected in series the 7th resistance successively and is connected with the pin 11 of photoelectrical coupler with after the 8th resistance.
5. a kind of IGBT according to claim 1 drives and protective circuit, it is characterized in that: described first power end is connected by the 5th electric capacity with between the first earth terminal.
6. a kind of IGBT according to claim 1 drives and protective circuit, it is characterized in that: described photoelectrical coupler is ACPL-332J type photoelectrical coupler.
7. a kind of IGBT according to claim 6 drives and protective circuit, it is characterized in that: the value of described second electric capacity and the second resistance meets following formula:
Wherein, R is the value of the second resistance, and C is the value of the second electric capacity, and t is IGBT ON time, V
1for IGBT pressure drop voltage, V
2be the first power end voltage, V
3for second source terminal voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520415133.5U CN204668926U (en) | 2015-06-16 | 2015-06-16 | A kind of IGBT drives and protective circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520415133.5U CN204668926U (en) | 2015-06-16 | 2015-06-16 | A kind of IGBT drives and protective circuit |
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| CN204668926U true CN204668926U (en) | 2015-09-23 |
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| CN201520415133.5U Active CN204668926U (en) | 2015-06-16 | 2015-06-16 | A kind of IGBT drives and protective circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104901282A (en) * | 2015-06-16 | 2015-09-09 | 宁波兴泰机械有限公司 | IGBT driving and protecting circuit |
| CN109067305A (en) * | 2018-08-15 | 2018-12-21 | 石阡县龙塘镇大山村鑫源茶叶专业合作社 | A kind of tea stir-frying machine motor-drive circuit |
-
2015
- 2015-06-16 CN CN201520415133.5U patent/CN204668926U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104901282A (en) * | 2015-06-16 | 2015-09-09 | 宁波兴泰机械有限公司 | IGBT driving and protecting circuit |
| CN109067305A (en) * | 2018-08-15 | 2018-12-21 | 石阡县龙塘镇大山村鑫源茶叶专业合作社 | A kind of tea stir-frying machine motor-drive circuit |
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Address after: 315111 five Town Industrial Zone, Ningbo, Zhejiang, Yinzhou District Patentee after: Ningbo Xingtai Technology Co., Ltd. Address before: 315111 Zhejiang city of Ningbo province Yinzhou District Wuxiang Industrial Park Xin Shui Road No. 6 Patentee before: Ningbo Xingtai Machinery Co., Ltd. |