CN202930917U - IGBT overcurrent protection system for EPS power supply - Google Patents
IGBT overcurrent protection system for EPS power supply Download PDFInfo
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- CN202930917U CN202930917U CN 201220626550 CN201220626550U CN202930917U CN 202930917 U CN202930917 U CN 202930917U CN 201220626550 CN201220626550 CN 201220626550 CN 201220626550 U CN201220626550 U CN 201220626550U CN 202930917 U CN202930917 U CN 202930917U
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Abstract
The utility model relates to the IGBT protection technical field of EPS power supply, in particular to an IGBT overcurrent protection system for an EPS power supply. The IGBT overcurrent protection system comprises a current detection circuit, a current-limiting protection circuit, a drive blocking circuit and a counter, wherein the current detection circuit carries out real-time sampling on an IGBT circuit to be protected and outputs sampling signals IVOLT; the current-limiting protection circuit acquires the sampling signals IVOLT and outputs valid or invalid first-stage current-limiting signals FAULT; the counter counts the valid first-stage current-limiting signals FAULT, and outputs long-time valid second-stage current-limiting signals BLOCK to the drive blocking circuit when the count value reaches a preset value in a rated time; and the drive blocking circuit blocks driving signals PWM of the IGBT when the second-stage current-limiting signals BLOCK or the first-stage current-limiting signals FAULT are valid, so as to realize the effective overcurrent protection of the IGBT.
Description
Technical field
The utility model relates to the IGBT resist technology field of EPS power supply, refers to especially a kind of IGBT Over Current Protection System for the EPS power supply.
Background technology
The interchange emergency service of EPS power supply (emergency power supply) all kinds of particular importances load when being widely used in commercial power interruption is as the power supply of all kinds of vital computer system; The work power supply of all kinds of buildings and fire-fighting power supply; Hospital's safe power supply; The power supply of traffic system highway, tunnel, subway, light rail, civil airport; The power supply of electric power system; The power supply of all kinds of productions that can not cut off the power supply, experimental facilities.It mainly comprises the parts such as input-output unit, charging module, battery pack, inverter, watch-dog, output switching device, and wherein the main element of inverter unit is the IGBT(insulated gate bipolar transistor).It is the critical elements of inverter due to IGBT; the circuit fluctuation of IGBT of flowing through is larger; might damage the safety that IGBT arranges affects whole EPS power supply if this electric current is excessive; and the cost compare of IGBT is high, therefore generally needs special Over Current Protection System to carry out overcurrent protection to IGBT.
Existing Over Current Protection System generally comprises current detection circuit, current-limiting protection circuit and driving lockout circuit; detect the electric current of IGBT by current detection circuit; then judge whether excessive transfiniting of this electric current by current-limiting protection circuit; if transfinite export effective locking signal and make and drive the driving signal that IGBT is blocked in lockout circuit, turn-off IGBT with protection IGBT.But this system closes at IGBT and has no progeny, and IGBT does not have electric current to pass through, and system can't detect fault, the driving signal relief of IGBT is blocked make the IGBT conducting.Because the reason of over current fault is varied; this moment, over current fault might be eliminated because of the protection action of back; also may also exist; if over current fault still exists; IGBT will will be turned off after conducting again; so repeatedly, IGBT will constantly repeat to disconnect, the action of conducting, can't effectively play the effect of IGBT being carried out overcurrent protection.
Summary of the invention
The purpose of this utility model is to avoid above-mentioned weak point of the prior art and a kind of IGBT Over Current Protection System that is used for the EPS power supply that can be effectively carry out overcurrent protection to IGBT is provided.
The purpose of this utility model is achieved through the following technical solutions:
a kind of IGBT Over Current Protection System for the EPS power supply is provided, comprise current detection circuit, current-limiting protection circuit and driving lockout circuit, described current detection circuit carries out real-time current to IGBT circuit to be protected and samples and export sampled signal IVOLT, described current-limiting protection circuit obtains sampled signal IVOLT and exports in real time effective or invalid one-level current limliting signal FAULT, also comprise counter, described counter obtains one-level current limliting signal FAULT and effective one-level current limliting signal FAULT is counted, when output is long when inside counting time rating value reaches preset value, effective secondary current limliting signal BLOCK is to driving lockout circuit, described driving lockout circuit is blocked the driving signal PWM of IGBT when effective at secondary current limliting signal BLOCK or one-level current limliting signal FAULT.
Wherein, described current-limiting protection circuit comprises full-wave rectifying circuit and comparison circuit, and described full-wave rectifying circuit mainly is made of operational amplifier Q1 and operational amplifier Q2, and described comparison circuit comprises comparator U1.
Wherein, described driving lockout circuit comprises comparator U2 and logical AND gate U3, the input of described comparator U2 be coupled simultaneously one-level current limliting signal FAULT and secondary current limliting signal BLOCK, an input of the output coupling logical AND gate of described comparator, the driving signal PWM of another input coupling IGBT of described logical AND gate.
Wherein, also comprise signal conditioning circuit, described counter obtains one-level current limliting signal FAULT through signal conditioning circuit from current-limiting protection circuit.
Wherein, described signal conditioning circuit comprises the clamp circuit that is made of diode D3 and diode D4.
the beneficial effects of the utility model: when there is over current fault in IGBT, current detection circuit detects the sampled signal IVOLT that transfinites, current-limiting protection circuit obtains this sampled signal IVOLT, effective one-level current limliting signal FAULT of output after judgement, this one stage signal makes and drives the driving signal PWM that IGBT is blocked in lockout circuit, turn-off IGBT, IGBT is carried out real-time current-limiting protection, unison counter is counted one-level current limliting signal FAULT, the IGBT no current passes through subsequently, one-level current limliting signal FAULT invalidating signal, IGBT is conducting again, if this moment, over current fault was not eliminated, current-limiting protection circuit will be exported effective one-level current limliting signal FAULT again turn-offs IGBT, counter is counted again, continuous several times produces one-level current limliting signal FAULT in rolling counters forward is learnt certain hour, can judge that this moment, IGBT was in shutoff repeatedly, conducting state, rely on this moment one-level current limliting signal FAULT efficient solution to remove over current fault, effective secondary current limliting signal BLOCK when namely output is long, make and drive the driving signal PWM that IGBT is blocked in lockout circuit thoroughly, turn-off IGBT until other protection actions or operating personnel have effectively eliminated over current fault.
Description of drawings
Fig. 1 is the circuit block diagram of a kind of IGBT Over Current Protection System for the EPS power supply of the utility model.
Fig. 2 is the circuit diagram of the current-limiting protection circuit of a kind of IGBT Over Current Protection System for the EPS power supply of the utility model.
Fig. 3 is the circuit diagram of the driving lockout circuit of a kind of IGBT Over Current Protection System for the EPS power supply of the utility model.
Fig. 4 is the circuit diagram of the signal conditioning circuit of a kind of IGBT Over Current Protection System for the EPS power supply of the utility model.
Embodiment
With the following Examples the utility model is further described.
the embodiment of a kind of IGBT Over Current Protection System for the EPS power supply of the utility model, as shown in Figure 1, comprise: current detection circuit 1, current-limiting protection circuit 2 and driving lockout circuit 3, 1 pair of IGBT circuit to be protected of described current detection circuit carries out real-time sampling and exports sampled signal IVOLT, described current-limiting protection circuit 2 obtains sampled signal IVOLT and exports in real time effective or invalid one-level current limliting signal FAULT, also comprise counter 4, described counter 4 obtains one-level current limliting signal FAULT and effective one-level current limliting signal FAULT is counted, effective secondary current limliting signal BLOCK is to driving lockout circuit 3 when output is long when inside counting time rating value reaches preset value, described driving lockout circuit 3 is blocked the driving signal PWM of IGBT when effective at secondary current limliting signal BLOCK or one-level current limliting signal FAULT.
when there is over current fault in IGBT, current detection circuit 1 detects the sampled signal IVOLT that transfinites, current-limiting protection circuit 2 obtains this sampled signal IVOLT effective one-level current limliting signal FAULT of output after judgement, this one stage signal makes and drives the driving signal PWM that IGBT is blocked in lockout circuit 3, turn-off IGBT, IGBT is carried out real-time current-limiting protection, and 4 couples of one-level current limliting signal FAULT of unison counter count, the IGBT no current passes through subsequently, one-level current limliting signal FAULT invalidating signal, IGBT is conducting again, if this moment, over current fault was not eliminated, current-limiting protection circuit 2 will be exported effective one-level current limliting signal FAULT again turn-offs IGBT, counter 4 is counted again, when counter 4 countings learn that in time rating, continuous several times produces one-level current limliting signal FAULT, can judge that this moment, IGBT was in shutoff repeatedly, conducting state, rely on this moment one-level current limliting signal FAULT efficient solution to remove over current fault, effective secondary current limliting signal BLOCK when namely output is long, make and drive the driving signal PWM that IGBT is blocked in lockout circuit 3 up hill and dale, turn-off IGBT until other protection actions or operating personnel have effectively eliminated over current fault.Thereby realize the effective overcurrent protection to IGBT.
As shown in Figure 2, described current-limiting protection circuit 2 comprises full-wave rectifying circuit 21 and comparison circuit 22, and described full-wave rectifying circuit 21 mainly is made of operational amplifier Q1 and operational amplifier Q2, and described comparison circuit 22 comprises comparator U1.After sampled signal IVOLT is input to current-limiting protection circuit 2; full-wave rectifying circuit 21 is converted into sampled signal IVOLT the direct current signal of pulsation by ac voltage signal; then in comparison circuit 22 by comparator U1 with sampled signal IVOLT and current limliting fiducial value REF relatively, if sampled signal IVOLT greater than current limliting fiducial value REF export that in effective one-level current limliting signal FAULT(the present embodiment, effective one-level current limliting signal FAULT is high level).
As shown in Figure 3, described driving lockout circuit 3 comprises comparator U2 and logical AND gate U3, the inverting input of described comparator U2 be coupled simultaneously one-level current limliting signal FAULT and secondary current limliting signal BLOCK, an input of the output coupling logical AND gate of described comparator, the driving signal PWM of another input coupling IGBT of described logical AND gate.When one effective (high level) in one-level current limliting signal FAULT and secondary current limliting signal BLOCK, comparator U2 output low level is to logical AND gate U3, no matter this moment, whether the driving signal PWM of IGBT was effective, logical AND gate U3 output is low level, realizes turn-offing IGBT.
As shown in Figure 1, native system also comprises signal conditioning circuit 5, and described counter 4 obtains one-level current limliting signal FAULT through signal conditioning circuit 5 from current-limiting protection circuit 2.As shown in Figure 4, described signal conditioning circuit 5 comprises the clamp circuit that is made of diode D3 and diode D4.Because the level of one-level current limliting signal FAULT is higher, may therefore adopt signal conditioning circuit 5 not in the allowed band of counter 4 inputs, guarantee that the level of one-level current limliting signal FAULT is in the allowed band of counter 4 inputs.
Should be noted that at last; above embodiment is only in order to illustrate the technical solution of the utility model; but not to the restriction of the utility model protection range; although with reference to preferred embodiment, the utility model has been done to explain; 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 break away from essence and the scope of technical solutions of the utility model.
Claims (5)
1. IGBT Over Current Protection System that is used for the EPS power supply, comprise current detection circuit, current-limiting protection circuit and driving lockout circuit, described current detection circuit carries out real-time current to IGBT circuit to be protected and samples and export sampled signal IVOLT, described current-limiting protection circuit obtains sampled signal IVOLT and exports in real time effective or invalid one-level current limliting signal FAULT, it is characterized in that: also comprise counter, described counter obtains one-level current limliting signal FAULT and effective one-level current limliting signal FAULT is counted, when output is long when inside counting time rating value reaches preset value, effective secondary current limliting signal BLOCK is to driving lockout circuit, described driving lockout circuit is blocked the driving signal PWM of IGBT when effective at secondary current limliting signal BLOCK or one-level current limliting signal FAULT.
2. a kind of IGBT Over Current Protection System for the EPS power supply according to claim 1; it is characterized in that: described current-limiting protection circuit comprises full-wave rectifying circuit and comparison circuit; described full-wave rectifying circuit mainly is made of operational amplifier Q1 and operational amplifier Q2, and described comparison circuit comprises comparator U1.
3. a kind of IGBT Over Current Protection System for the EPS power supply according to claim 1; it is characterized in that: described driving lockout circuit comprises comparator U2 and logical AND gate U3; the input of described comparator U2 be coupled simultaneously one-level current limliting signal FAULT and secondary current limliting signal BLOCK; an input of the output coupling logical AND gate of described comparator, the driving signal PWM of another input coupling IGBT of described logical AND gate.
4. a kind of IGBT Over Current Protection System for the EPS power supply according to claim 1, it is characterized in that: also comprise signal conditioning circuit, described counter obtains one-level current limliting signal FAULT through signal conditioning circuit from current-limiting protection circuit.
5. a kind of IGBT Over Current Protection System for the EPS power supply according to claim 4, it is characterized in that: described signal conditioning circuit comprises the clamp circuit that is made of diode D3 and diode D4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220626550 CN202930917U (en) | 2012-11-23 | 2012-11-23 | IGBT overcurrent protection system for EPS power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220626550 CN202930917U (en) | 2012-11-23 | 2012-11-23 | IGBT overcurrent protection system for EPS power supply |
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| CN202930917U true CN202930917U (en) | 2013-05-08 |
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| CN 201220626550 Expired - Lifetime CN202930917U (en) | 2012-11-23 | 2012-11-23 | IGBT overcurrent protection system for EPS power supply |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104300519A (en) * | 2014-10-17 | 2015-01-21 | 许继电气股份有限公司 | Method for restraining overlarge current during low-voltage ride-through of photovoltaic grid-connected inverter |
| CN104821751A (en) * | 2015-03-31 | 2015-08-05 | 浙江新富凌电气股份有限公司 | Frequency converter rapid start-stop machine control system |
| CN109286395A (en) * | 2018-09-07 | 2019-01-29 | 中国电子科技集团公司第五十八研究所 | A kind of gate drive circuit Over Current Protection System |
| CN110190586A (en) * | 2019-06-11 | 2019-08-30 | 阳光电源股份有限公司 | It is a kind of to cross method of flow control, equipment and system |
| CN110247615A (en) * | 2018-03-09 | 2019-09-17 | 深圳市蓝海华腾技术股份有限公司 | Wave limiting control system, method and electric machine controller based on dsp chip |
-
2012
- 2012-11-23 CN CN 201220626550 patent/CN202930917U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104300519A (en) * | 2014-10-17 | 2015-01-21 | 许继电气股份有限公司 | Method for restraining overlarge current during low-voltage ride-through of photovoltaic grid-connected inverter |
| CN104300519B (en) * | 2014-10-17 | 2018-01-23 | 国家电网公司 | Suppress electric current excessive method during a kind of photovoltaic combining inverter low voltage crossing |
| CN104821751A (en) * | 2015-03-31 | 2015-08-05 | 浙江新富凌电气股份有限公司 | Frequency converter rapid start-stop machine control system |
| CN110247615A (en) * | 2018-03-09 | 2019-09-17 | 深圳市蓝海华腾技术股份有限公司 | Wave limiting control system, method and electric machine controller based on dsp chip |
| CN110247615B (en) * | 2018-03-09 | 2024-04-12 | 深圳市蓝海华腾技术股份有限公司 | Wave-by-wave current limiting control system and method based on DSP chip and motor controller |
| CN109286395A (en) * | 2018-09-07 | 2019-01-29 | 中国电子科技集团公司第五十八研究所 | A kind of gate drive circuit Over Current Protection System |
| CN109286395B (en) * | 2018-09-07 | 2022-02-15 | 中国电子科技集团公司第五十八研究所 | Gate drive circuit overcurrent protection system |
| CN110190586A (en) * | 2019-06-11 | 2019-08-30 | 阳光电源股份有限公司 | It is a kind of to cross method of flow control, equipment and system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130508 |
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| CX01 | Expiry of patent term |