CN202749802U - Circuit for protecting IGBT in output short-circuit state of frequency converter - Google Patents
Circuit for protecting IGBT in output short-circuit state of frequency converter Download PDFInfo
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- CN202749802U CN202749802U CN201220473845.9U CN201220473845U CN202749802U CN 202749802 U CN202749802 U CN 202749802U CN 201220473845 U CN201220473845 U CN 201220473845U CN 202749802 U CN202749802 U CN 202749802U
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Abstract
Disclosed in the utility model is a circuit for protecting an insulated gate bipolar transistor (IGBT) in an output short-circuit state of a frequency converter. The circuit comprises a triode Q1, a triode Q2, a triode Q3, one or more IGBTs, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a voltage stabilizing diode Z, an optocoupler, drive signal output terminals connected with the IGBT or the IGBTs, and a fault opening signal output terminal. According to the utility model, when a short circuit phenomenon occurs during the running process of the frequency converter, the change of the bus bar current can be rapidly detected and the output of an IGBT drive signal can be locked timely; and a turn-off module is utilized to protect the safety of the frequency converter. Therefore, a defect that the frequency converter can not be protected timely by software detection can be overcome; and the cost pressure caused by optocoupler driving with utilization of integrated protection can be reduced, so that the properties of simpleness and practicality are realized. The circuit has a great economic significance.
Description
Technical field
The utility model belongs to the converter technology field, the circuit of protection IGBT when relating in particular to a kind of frequency converter output short-circuit.
Background technology
IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) have that field-effect transistor input impedance is high, driving power is little and bipolar transistor voltage, current capacity reach greatly the low characteristics of tube voltage drop concurrently, be present frequency converter and in, the electronic power switch device that the most generally uses of high power switching power supply.
At present, the protective circuit of IGBT mainly contains two kinds of detection modes, and a kind of is the voltage detecting mode, and a kind of is the current detecting mode.
The basic principle of voltage detecting mode is to judge that IGBT is straight-through or export whether short circuit by the pressure drop of the collector and emitter that detects IGBT.The triode pressure drop contains short circuit current information, the voltage drop of collector and emitter increases during overcurrent, and be essentially linear relationship, the voltage drop of the collector and emitter during with the detection overcurrent and the threshold value of setting compare, and control the shutoff of drive circuit by the output of comparator.
Whether the current detecting mode is to come decision circuitry unusual by the size that detects output current.Be the method with the IGBT over-current detection, normally adopt the output current of Hall current sensor direct-detection IGBT, then with the threshold ratio of setting, go to control the shutoff of driving signal with the output of comparator.
The duration of short circuit that IGBT can bear depends on the size of its saturation voltage drop and short circuit current, generally only is 10 μ s.The existing short-circuit protection scheme in frequency converter field is to detect to protect IGBT by integrated intelligent driving optocoupler and Hall basically, but adopts the cost of intelligent drives optocoupler and Hall protection higher.
The utility model content
The circuit of protection IGBT when the purpose of this utility model is to provide a kind of frequency converter output short-circuit is intended to reduce the protection cost of frequency converter and when being short-circuited, effectively protects the safety of frequency converter in the middle of the frequency converter running.
The utility model is to realize like this, the circuit of protection IGBT comprises triode Q1, Q2, Q3, one or more IGBT, the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, a voltage stabilizing didoe Z, optocoupler, the driving signal output terminal that is connected with described IGBT and a fault opening signal lead-out terminal during a kind of frequency converter output short-circuit; Described optocoupler comprises a light-emitting diode D1 and a phototriode Q4;
The other end that the positive electrode bus P of described frequency converter connects the first resistance R 1, the first resistance R 1 connects the source electrode of described IGBT and the emitter of triode Q1, and the drain electrode of described IGBT connects the negative pole bus N of described frequency converter; The base stage short circuit of the base stage of triode Q1 and its collector electrode and triode Q2, and simultaneously by the second resistance R 2 ground connection, the emitter of triode Q2 is connected to positive electrode bus P by the 4th resistance R 4, the collector electrode of triode Q2 is by the 3rd resistance R 3 ground connection; The emitter of triode Q3 connects the negative electrode of voltage stabilizing didoe Z, the anode of voltage stabilizing didoe Z is ground connection then, the collector electrode of triode Q3 is by the negative electrode of the 5th resistance R 5 connecting luminous diode D1, the anodic bonding of light-emitting diode D1 is to positive electrode bus P, and the base stage of triode Q3 is connected to the collector electrode of triode Q2; The collector electrode of phototriode Q4 connects fault opening signal lead-out terminal, grounded emitter.
Further, the circuit of described frequency converter output short-circuit time protection IGBT is built in the frequency converter.
Further, described triode Q1 is the positive-negative-positive triode.
Further, described triode Q2 is the positive-negative-positive triode.
Further, described triode Q3 is NPN type triode.
Further, the described voltage stabilizing didoe Z voltage stabilizing didoe that is 6.8V.
Compared with prior art; the beneficial effects of the utility model are: when being short-circuited in the middle of the frequency converter running; the circuit of protection IGBT can detect rapidly the variation of bus current; in time block the output that IGBT drives signal; utilize the safety of turn-offing the module protection frequency converter, the utility model can not only overcome the shortcoming that software detection can not in time be protected frequency converter, can reduce again to use integrated protection to drive the cost pressure that optocoupler brings; simple and practical, have a great economic significance.
Description of drawings
The circuit connection diagram of protection IGBT during frequency converter output short-circuit that Fig. 1 provides for the utility model.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explaining the utility model, and be not used in restriction the utility model.
In the utility model embodiment; when the circuit of protection IGBT is short-circuited in the middle of the frequency converter running during frequency converter output short-circuit; can detect rapidly the variation of bus current; in time block the output that IGBT drives signal; utilize to turn-off the safety of module protection frequency converter, not only overcome the shortcoming that software detection can not in time be protected frequency converter, also reduced to use integrated protection to drive the pressure that optocoupler brings; simple and practical, have a great economic significance.
As shown in Figure 1; the circuit of protection IGBT during frequency converter output short-circuit that the utility model embodiment provides; by triode Q1; Q2; Q3; insulated gate bipolar transistor IGBT 1; IGBT2; resistance R 1; R2; R3; R4; R5; a light-emitting diode D1 and a voltage stabilizing didoe Z; a phototriode Q4; two drive signal and a fault opening signal composition; voltage stabilizing didoe Z and phototriode Q4 consist of an optocoupler; the positive electrode bus P of described circuit connects the first resistance R 1; the other end of R1 connects the source electrode of insulated gate bipolar transistor IGBT 1 and the emitter of triode Q1; the grid of insulated gate bipolar transistor IGBT 1 connects first and drives signal output terminal 1; its drain electrode connects the source electrode of IGBT2; the grid of IGBT2 connects second and drives signal output terminal 2, and its drain electrode connects negative pole bus N.The base stage short circuit of the base stage of triode Q1 and its collector electrode and triode Q2, and simultaneously by the second resistance R 2 ground connection, the emitter of triode Q2 is connected to positive electrode bus P by the 4th resistance R 4, the collector electrode of triode Q2 is by the 3rd resistance R 3 ground connection.The emitter of triode Q3 connects the negative electrode of voltage stabilizing didoe Z, the anode of voltage stabilizing didoe Z is ground connection then, the collector electrode of triode Q3 is by the negative electrode of the 5th resistance R 5 connecting luminous diode D1, the anodic bonding of light-emitting diode D1 is to positive electrode bus P, and the base stage of triode Q3 is connected to the collector electrode of triode Q2.The collector electrode of phototriode Q4 connects fault opening signal lead-out terminal 3, grounded emitter.
The utility model is judged the whether short circuit of output of frequency converter by the size of current that detects bus P, first resistance R 1 of positive electrode bus P serial connection of IGBT front in frequency converter is for detection of electric current, under normal circumstances, the both end voltage of this first resistance R 1 is very little, electric current is also very little, the Q1 conducting, Q2, Q3 is in cut-off state.The voltage of voltage stabilizing didoe Z is 6.8V, because its leakage current is too little, can not work not conducting of optocoupler; As IGBT1 and IGBT2 during straight-through or output short-circuit; the both end voltage of the first resistance R 1 increases; Q2 satisfies turn-on condition; saturation conduction; also so that Q3 satisfies turn-on condition; voltage stabilizing didoe Z has enough leakage current normal operations; the optocoupler conducting; optical coupling secondary edges is conducting also; at this moment; fault opening signal lead-out terminal 3 and ground conducting; be low level, simultaneously, 3 controls first of fault opening signal lead-out terminal drive signal output terminal 1 and second and drive signal output terminal 2; drive circuit drives signal output terminal 1 and second by first and drives the driving ripple that signal output terminal 2 is closed IGBT1 and IGBT2 in the frequency converter, thereby plays the effect of protection IGBT1 and IGBT2.
In Fig. 1, triode Q1 and Q2 are the positive-negative-positive triode, and triode Q3 then is the positive-negative-positive triode.Voltage stabilizing didoe Z is the voltage stabilizing didoe of 6.8V.Simultaneously, should be appreciated that two IGBT have been shown among Fig. 1, specifically also can be applicable to one or more than the situation of two IGBT.
As an embodiment of the present utility model; the circuit of protection IGBT is built in the frequency converter; the protection threshold values of protective circuit can be according to concrete power section; arrange by the debug circuit parameter; simultaneously; for avoiding frequency converter to report continually fault normally to use, above-mentioned set protection threshold values must be crossed the flow point height than IGBT.
Among the utility model embodiment; when the circuit of protection IGBT is short-circuited in the middle of the frequency converter running during frequency converter output short-circuit; can detect rapidly the variation of positive electrode bus P electric current; in time block the output that IGBT drives signal; utilize to turn-off the safety of module protection frequency converter, not only overcome the shortcoming that software detection can not in time be protected frequency converter, also reduced to use integrated protection to drive the cost pressure that optocoupler brings; simple and practical, have a great economic significance.
The above only is preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of within spirit of the present utility model and principle, doing, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.
Claims (6)
1. the circuit of frequency converter output short-circuit time protection IGBT, it is characterized in that, comprise triode Q1, Q2, Q3, one or more IGBT, the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, a voltage stabilizing didoe Z, optocoupler, the driving signal output terminal that is connected with described IGBT and a fault opening signal lead-out terminal; Described optocoupler comprises a light-emitting diode D1 and a phototriode Q4;
The other end that the positive electrode bus P of described frequency converter connects the first resistance R 1, the first resistance R 1 connects the source electrode of described IGBT and the emitter of triode Q1, and the drain electrode of described IGBT connects the negative pole bus N of described frequency converter; The base stage short circuit of the base stage of triode Q1 and its collector electrode and triode Q2, and simultaneously by the second resistance R 2 ground connection, the emitter of triode Q2 is connected to positive electrode bus P by the 4th resistance R 4, the collector electrode of triode Q2 is by the 3rd resistance R 3 ground connection; The emitter of triode Q3 connects the negative electrode of voltage stabilizing didoe Z, the anode of voltage stabilizing didoe Z is ground connection then, the collector electrode of triode Q3 is by the negative electrode of the 5th resistance R 5 connecting luminous diode D1, the anodic bonding of light-emitting diode D1 is to positive electrode bus P, and the base stage of triode Q3 is connected to the collector electrode of triode Q2; The collector electrode of phototriode Q4 connects fault opening signal lead-out terminal, grounded emitter.
2. the circuit of frequency converter output short-circuit as claimed in claim 1 time protection IGBT is characterized in that, the circuit of protection IGBT is built in the frequency converter during described frequency converter output short-circuit.
3. the circuit of frequency converter output short-circuit as claimed in claim 1 time protection IGBT is characterized in that described triode Q1 is the positive-negative-positive triode.
4. the circuit of frequency converter output short-circuit as claimed in claim 1 time protection IGBT is characterized in that described triode Q2 is the positive-negative-positive triode.
5. the circuit of frequency converter output short-circuit as claimed in claim 1 time protection IGBT is characterized in that described triode Q3 is NPN type triode.
6. the circuit of frequency converter output short-circuit as claimed in claim 1 time protection IGBT is characterized in that described voltage stabilizing didoe Z is the voltage stabilizing didoe of 6.8V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220473845.9U CN202749802U (en) | 2012-09-06 | 2012-09-06 | Circuit for protecting IGBT in output short-circuit state of frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220473845.9U CN202749802U (en) | 2012-09-06 | 2012-09-06 | Circuit for protecting IGBT in output short-circuit state of frequency converter |
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| Publication Number | Publication Date |
|---|---|
| CN202749802U true CN202749802U (en) | 2013-02-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201220473845.9U Expired - Lifetime CN202749802U (en) | 2012-09-06 | 2012-09-06 | Circuit for protecting IGBT in output short-circuit state of frequency converter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105337261A (en) * | 2014-07-04 | 2016-02-17 | 上海联影医疗科技有限公司 | Electronic device and protection circuit thereof |
| CN104167710B (en) * | 2014-08-07 | 2017-11-10 | 石狮市酷瑞电气有限责任公司 | A kind of short-circuit protection circuit of frequency changer direct current bus |
| CN108900104A (en) * | 2018-09-10 | 2018-11-27 | 深圳市德利和能源技术有限公司 | IGBT analog device, level analog circuit and three level emulation platforms |
-
2012
- 2012-09-06 CN CN201220473845.9U patent/CN202749802U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105337261A (en) * | 2014-07-04 | 2016-02-17 | 上海联影医疗科技有限公司 | Electronic device and protection circuit thereof |
| CN105337261B (en) * | 2014-07-04 | 2019-01-11 | 上海联影医疗科技有限公司 | Electronic device and its protection circuit |
| CN104167710B (en) * | 2014-08-07 | 2017-11-10 | 石狮市酷瑞电气有限责任公司 | A kind of short-circuit protection circuit of frequency changer direct current bus |
| CN108900104A (en) * | 2018-09-10 | 2018-11-27 | 深圳市德利和能源技术有限公司 | IGBT analog device, level analog circuit and three level emulation platforms |
| CN108900104B (en) * | 2018-09-10 | 2024-04-16 | 深圳市德利和能源技术有限公司 | IGBT analog device, level analog circuit and three-level simulation platform |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130220 |
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| CX01 | Expiry of patent term |