CN204424877U - A kind of IGBT module Over Current Protection System - Google Patents
A kind of IGBT module Over Current Protection System Download PDFInfo
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- CN204424877U CN204424877U CN201420647520.7U CN201420647520U CN204424877U CN 204424877 U CN204424877 U CN 204424877U CN 201420647520 U CN201420647520 U CN 201420647520U CN 204424877 U CN204424877 U CN 204424877U
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Abstract
The utility model relates to a kind of IGBT module Over Current Protection System, is particularly positioned at the current foldback circuit on IGBT module drive plate, comprises current detection module, and the output of described current detection module is connected with the input of overcurrent comparison module; Described overcurrent comparison module exports and is connected to digital filtering and latches electric module, and the output of described digital filtering and latch module is connected to soft switching optocoupler; Described soft switching optocoupler exports and is connected to secondary soft switching module.The beneficial effects of the utility model are: in various unusual service condition; when comprising output short-circuit fault; IGBT module can realize controlling the shutoff of IGBT module by current foldback circuit when there is overcurrent; reduce IGBT shutoff voltage spike; prevent IGBT module to lose efficacy, improve device lifetime and reliability.
Description
Technical field
The utility model relates to a kind of IGBT module overcurrent protection, is especially positioned at the current foldback circuit on IGBT module drive plate.
Background technology
High-power inverter; comprising wind electric converter, photovoltaic DC-to-AC converter etc. all adopts IGBT module as Primary Component; in actual moving process; often because a variety of causes causes current transformer generation output short-circuit fault; usually the shorted to earth and phase fault etc. of grid side and motor side can be there is; this type of fault due to IGBT module transient current comparatively large, when causing IGBT module to turn off, peak voltage is very high, easily causes damage after exceeding IGBT module security of operation district.
The existing measure solved the problem has following several: the first, add Absorption Capacitance at IGBT module DC side two ends, Absorption Capacitance obviously to eliminate the due to voltage spikes that the outside stray inductance of IGBT module DC terminal causes, shortcoming is that Absorption Capacitance itself also exists certain inductance, and therefore inhibition is limited.
The second, in master board setting overcurrent protection value, namely after IGBT module electric current reaches set point, block PWM export, the method belongs to ACTIVE CONTROL IGBT module protection point, in some cases can available protecting, but for the situation that short-circuit output impedance is less, electric current DI/DT is very fast, the time of software startup protection is longer, easily causing to block after PWM exports causes IGBT electric current to exceed flow point higher value, IGBT module is caused to turn off moment electric current larger, and this situation IGBT module electric current does not reach and moves back saturation range (being generally 4 times of rated current of IGBT module), cause IGBT module peak voltage to exceed place of safety because IGBT module turns off firmly and damage.
The third, active clamping circuir popular at present, if after namely in IGBT turn off process, Vce voltage exceedes set point, by feedback circuit, the gate voltage of IGBT module is raised to some extent, reach the effect reducing electric current DI/DT, this circuit is complicated, particularly the selection of VCE voltage setting value is improper will cause circuit frequent movement, adds the loss of IGBT module and the loss of TVS pipe, easily causes device overheating failure.
Utility model content
The purpose of this utility model there are the problems referred to above for existing technology; IGBT module drive plate constructs a kind of current foldback circuit; when there is overcurrent in IGBT module; by realizing controlling the shutoff of IGBT module; reduce IGBT shutoff voltage spike; prevent IGBT module to lose efficacy, improve device lifetime and reliability.
The purpose of this utility model realizes by following technical proposal: a kind of IGBT module Over Current Protection System, and described protective circuit comprises current detection module, overcurrent comparison module, digital filtering and latch module, soft switching optocoupler, secondary soft switching module; The output of described current detection module is connected with the input of overcurrent comparison module; Described overcurrent comparison module output is connected to digital filtering and latch module, and the output of described digital filtering and latch module is connected to soft switching optocoupler; Described soft switching optocoupler output is connected to secondary soft switching module.
The effect of described current detection module is that the current signal of current transformer is converted to voltage signal by sampling with high precision resistance, and the signal conditioning circuit consisted of amplifier becomes the voltage signal for comparing.
The effect of described overcurrent comparison module is that the output signal of described current detection circuit is compared with the voltage setting value of over-current protection point, exports digital logic signal by amplifier or comparator.
Described digital filtering and the effect of latch module carry out filtering to the output digital logic signal of overcurrent comparison module, for filtering high-frequency interferencing signal, latches signal, for exporting control simultaneously.
The effect of described soft switching optocoupler is that over-current signal is passed to secondary circuit, plays buffer action.
The effect of described secondary soft switching module is the signal accepting to be transmitted by soft switching optocoupler on former limit, controls the shutoff of secondary drive circuit, reaches the control controlling IGBT module electric current DI/DT speed, realizes reducing shutoff voltage spike.
Described current foldback circuit also comprises electric current comparison point setting module, PWM input filter module, crystal oscillating circuit and WD module, for connecting the driving optocoupler of driven signal, also has the feedback optocoupler that secondary side feedback exports, power supply input filter module, DC/DC modular converter, and isolating transformer, for the Voltage stabilizing module that stable+15V/-15V exports, for the under-voltage protective module monitored secondary voltage voltage; Also comprise for the driver module of driven IGBT module with for Vce-sat detection module; Described overcurrent comparison module input is connected to the output of output electric current measure module and the input of electric current comparison point setting module, and the output of electric current comparison point setting module (6) is connected to digital filtering and latch module; The output of described digital filtering and latch module is connected to soft switching optocoupler respectively, drives optocoupler and feedback optocoupler; Described PWM input filter module and crystal oscillating circuit and WD module export and are connected to digital filtering and latch module; Described secondary soft switching model calling is to soft switching optocoupler, and the output of described Vce-sat detection module and under-voltage protective module is connected to the input of feedback optocoupler; Described power supply input filter module exports and is connected to DC/DC modular converter, and described DC/DC modular converter is connected to isolating transformer, and described isolating transformer is connected to Voltage stabilizing module, after voltage stabilizing, export+15V/-15V voltage.
Described digital filtering and latch module can be FPGA, CPLD logic chip or DSP digital processing unit.
Described driving optocoupler and feedback optocoupler are expanded letter optocoupler.
Described Vce-sat detection module comprises the comparison circuit and RC filter circuit that are made up of amplifier.
Described under-voltage protective module comprises comparison circuit and the latch cicuit of amplifier composition.
Advantage of the present utility model: after native system detects that IGBT module output current exceedes set point, filtering and latch are carried out to signal, secondary soft turn-off function is realized by soft switching optocoupler, reduce electric current di/dt speed, thus reduce the shutoff voltage spike of IGBT module, improve the reliability of IGBT module.
Accompanying drawing explanation
Fig. 1 is a kind of IGBT module current foldback circuit that the utility model relates to.
Fig. 2 is a kind of IGBT module current foldback circuit exemplary embodiments embodiment that the utility model relates to.
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 Fig. 1, a kind of IGBT module Over Current Protection System, described protective circuit comprises current detection module, overcurrent comparison module, digital filtering and latch module, soft switching optocoupler, secondary soft switching module; The output of described current detection module is connected with the input of overcurrent comparison module; Described overcurrent comparison module output is connected to digital filtering and latch module, and the output of described digital filtering and latch module is connected to soft switching optocoupler; Described soft switching optocoupler output is connected to secondary soft switching module; The effect of described current detection module is that the current signal of current transformer is converted to voltage signal by sampling with high precision resistance, and the signal conditioning circuit consisted of amplifier becomes the voltage signal for comparing; The effect of described overcurrent comparison module is that the output signal of described current detection circuit is compared with the voltage setting value of over-current protection point, exports digital logic signal by amplifier or comparator; Described digital filtering and the effect of latch module carry out filtering to the output digital logic signal of overcurrent comparison module, for filtering high-frequency interferencing signal, latches signal, for exporting control simultaneously; The effect of described soft switching optocoupler is that over-current signal is passed to secondary circuit, plays buffer action; The effect of described secondary soft switching module is the signal accepting to be transmitted by soft switching optocoupler on former limit, controls the shutoff of secondary drive circuit, reaches the control controlling IGBT module electric current DI/DT speed, realizes reducing shutoff voltage spike.
Described current foldback circuit also comprises electric current comparison point setting module 6, PWM input filter module 7, crystal oscillating circuit and WD module 8, for connecting the driving optocoupler 9 of driven signal, also has the feedback optocoupler 10 that secondary side feedback exports, power supply input filter module 11, DC/DC modular converter 12, and isolating transformer 13, for the Voltage stabilizing module 14 that stable+15V/-15V exports, for the under-voltage protective module 15 monitored secondary voltage voltage; Also comprise for the driver module 16 of driven IGBT module with for Vce-sat detection module 17.
Described overcurrent comparison module 2 input is connected to the output of output electric current measure module 1 and the input of electric current comparison point setting module 6, and the output of electric current comparison point setting module 6 is connected to digital filtering and latch module 3.
The output of described digital filtering and latch module 3 is connected to soft switching optocoupler 4 respectively, drives optocoupler 9 and feedback optocoupler 10;
Described PWM input filter module 7 and crystal oscillating circuit and WD module 8 export and are connected to digital filtering and latch module 3;
Described secondary soft switching module 5 is connected to soft switching optocoupler 4, and the output of described Vce-sat detection module 17 and under-voltage protective module 15 is connected to the input of feedback optocoupler 10.
Described power supply input filter module 11 exports and is connected to DC/DC modular converter 12, and described DC/DC modular converter 12 is connected to isolating transformer 13, and described isolating transformer 13 is connected to Voltage stabilizing module 14, after voltage stabilizing, export+15V/-15V voltage.
Described driving optocoupler 9 and feedback optocoupler 10 are expanded letter optocoupler.
Described Vce-sat detection module 17 comprises the comparison circuit and RC filter circuit that are made up of amplifier.
Described under-voltage protective module 15 comprises the comparison circuit and latch cicuit that are made up of amplifier.
The operation principle of native system: when 1, IGBT module electric current is less than over-current protection point set point, overcurrent comparison signal exports normal value, and soft switching optocoupler does not work, and drive optocoupler normally to work, its secondary soft switching module does not work, and driver module normally works.
2, when IGBT module electric current is greater than over-current protection point set point, overcurrent comparison signal exports fault value, and soft switching optocoupler works, and drive optocoupler not work, its secondary soft switching module work, driver module does not work.
3, when IGBT module generation shoot through, IGBT module Vce moves back saturated, secondary soft switching module work, and driver module does not work, the work of feedback optocoupler.
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 (6)
1. an IGBT module Over Current Protection System, is characterized in that: described protective circuit comprises current detection module (1), overcurrent comparison module (2), digital filtering and latch module (3), soft switching optocoupler (4), secondary soft switching module (5); The output of described current detection module (1) is connected with the input of overcurrent comparison module (2); Described overcurrent comparison module (2) output is connected to digital filtering and latch module (3), and the output of described digital filtering and latch module (3) is connected to soft switching optocoupler (4); Described soft switching optocoupler (4) output is connected to secondary soft switching module (5);
The effect of described current detection module (1) is that the current signal of current transformer is converted to voltage signal by sampling with high precision resistance, and the signal conditioning circuit consisted of amplifier becomes the voltage signal for comparing;
The effect of described overcurrent comparison module (2) is that the described output signal of current detection circuit 1 is compared with the voltage setting value of over-current protection point, exports digital logic signal by amplifier or comparator;
The effect of described digital filtering and latch module (3) carries out filtering to the output digital logic signal of overcurrent comparison module 2, for filtering high-frequency interferencing signal, latches signal, for exporting control simultaneously;
The effect of described soft switching optocoupler (4) is that over-current signal is passed to secondary circuit, plays buffer action;
The effect of described secondary soft switching module (5) is the signal accepting to be transmitted by soft switching optocoupler on former limit, controls the shutoff of secondary drive circuit, reaches the control controlling IGBT module electric current DI/DT speed, realizes reducing shutoff voltage spike.
2. a kind of IGBT module Over Current Protection System according to claim 1, it is characterized in that: described current foldback circuit also comprises electric current comparison point setting module (6), PWM input filter module (7), crystal oscillating circuit and WD module (8), for connecting the driving optocoupler (9) of driven signal, also has the feedback optocoupler (10) that secondary side feedback exports, power supply input filter module (11), DC/DC modular converter (12), and isolating transformer (13), for the Voltage stabilizing module (14) that stable+15V/-15V exports, for the under-voltage protective module (15) monitored secondary voltage voltage, also comprise for the driver module (16) of driven IGBT module with for Vce-sat detection module (17),
Described overcurrent comparison module (2) input is connected to the output of output electric current measure module (1) and the input of electric current comparison point setting module (6), and the output of electric current comparison point setting module (6) is connected to digital filtering and latch module (3);
The output of described digital filtering and latch module (3) is connected to soft switching optocoupler (4) respectively, drives optocoupler (9) and feedback optocoupler (10);
Described PWM input filter module (7) and crystal oscillating circuit and WD module (8) export and are connected to digital filtering and latch module (3);
Described secondary soft switching module (5) is connected to soft switching optocoupler (4), and the output of described Vce-sat detection module (17) and under-voltage protective module (15) is connected to the input of feedback optocoupler (10);
The output of described power supply input filter module (11) is connected to DC/DC modular converter (12), described DC/DC modular converter (12) is connected to isolating transformer (13), described isolating transformer (13) is connected to Voltage stabilizing module (14), after voltage stabilizing, export+15V/-15V voltage.
3. a kind of IGBT module Over Current Protection System according to claim 2, is characterized in that: described digital filtering and latch module (3) can be FPGA, CPLD logic chip or DSP digital processing unit.
4. a kind of IGBT module Over Current Protection System according to Claims 2 or 3, is characterized in that: described driving optocoupler (9) and feedback optocoupler (10) are expanded letter optocoupler.
5. a kind of IGBT module Over Current Protection System according to claim 4, is characterized in that: described Vce-sat detection module (17) comprises the comparison circuit and RC filter circuit that are made up of amplifier.
6. a kind of IGBT module Over Current Protection System according to claim 5, is characterized in that: described under-voltage protective module (15) comprises comparison circuit and the latch cicuit of amplifier composition.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420647520.7U CN204424877U (en) | 2014-11-03 | 2014-11-03 | A kind of IGBT module Over Current Protection System |
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| CN201420647520.7U CN204424877U (en) | 2014-11-03 | 2014-11-03 | A kind of IGBT module Over Current Protection System |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104393571A (en) * | 2014-11-03 | 2015-03-04 | 浙江海得新能源有限公司 | IGBT module over-current protection system |
| CN109547001A (en) * | 2018-12-27 | 2019-03-29 | 深圳市英威腾电动汽车驱动技术有限公司 | The current foldback circuit of insulated gate bipolar transistor |
| CN110460021A (en) * | 2019-08-15 | 2019-11-15 | 海信（山东）空调有限公司 | A kind of IGBT protection circuit and air conditioner |
-
2014
- 2014-11-03 CN CN201420647520.7U patent/CN204424877U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104393571A (en) * | 2014-11-03 | 2015-03-04 | 浙江海得新能源有限公司 | IGBT module over-current protection system |
| CN109547001A (en) * | 2018-12-27 | 2019-03-29 | 深圳市英威腾电动汽车驱动技术有限公司 | The current foldback circuit of insulated gate bipolar transistor |
| CN110460021A (en) * | 2019-08-15 | 2019-11-15 | 海信（山东）空调有限公司 | A kind of IGBT protection circuit and air conditioner |
| CN110460021B (en) * | 2019-08-15 | 2022-02-25 | 海信（山东）空调有限公司 | IGBT protection circuit and air conditioner |
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