CN203218868U - Overcurrent cascade protection circuit of IGBT (Insulated Gate Bipolar Translator) - Google Patents
Overcurrent cascade protection circuit of IGBT (Insulated Gate Bipolar Translator) Download PDFInfo
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- CN203218868U CN203218868U CN 201320014915 CN201320014915U CN203218868U CN 203218868 U CN203218868 U CN 203218868U CN 201320014915 CN201320014915 CN 201320014915 CN 201320014915 U CN201320014915 U CN 201320014915U CN 203218868 U CN203218868 U CN 203218868U
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Abstract
The utility model discloses an overcurrent cascade protection circuit of an IGBT (Insulated Gate Bipolar Translator). The protection circuit comprises a DSP (Digital Signal Processor) circuit, a current comparison circuit and a PWM (Pulse Width Modulation) drive circuit, wherein the DSP circuit is connected with the PWM drive circuit and the current comparison circuit respectively. According to the utility model, under the normal working condition of the overcurrent cascade protection circuit of the IGBT, current of the IGBT is lower than set current, the voltage of an out-phase input terminal of a comparator is lower than that of an in-phase input terminal, at the time, a high level is outputted by the comparator, and overcurrent protection signals are not generated; and when the current of the IGBT is higher than the set current, the voltage of the out-phase input terminal of the comparator is higher than that of the in-phase input terminal, at the time, a low level is outputted by the comparator, and the overcurrent protection signals are generated. According to the overcurrent cascade protection circuit disclosed by the utility model, tripping protection resources of DSP overcurrent protection are adequately utilized, and a power device, namely an IGBT, in a power supply system is then subjected to perfect protection.
Description
Technical field
The utility model relates to a kind of high frequency switch power technical field, is specifically related to the overcurrent cascade protection circuit of a kind of power device IGBT.
Background technology
In high-power electric energy transformation system; the normal IGBT device that adopts is realized transformation of electrical energy; the current protection technology of IGBT device becomes the important step of transformation of electrical energy system; it also is one of reliability measurement index of transformation of electrical energy system; now general way is exactly with IGBT current signal and its trouble free service current ratio; surpass then protection, perhaps period protection.Because the operating characteristic of IGBT allows the moment overcurrent; so surpass the then method of protection; the work continuity of the meeting system that influences to a certain extent; because in welding and some electrochemistry industry; the transformation of electrical energy system can produce the moment over-current phenomenon avoidance, secondly also be difficult to bring into play the IGBT device moment overcurrent advantage, period protection then causes system always in discontinuous operation when the real fault of system; do not stop IGBT work, it is unfavorable also can to produce the IGBT device.
The utility model content
The utility model purpose is to provide the overcurrent cascade protection circuit of a kind of IGBT, to solve IGBT overcurrent protection problem in existing some transformation of electrical energy application.The utility model can be analyzed the IGBT over-current signal, judgement system work normally whether, to reach the purpose of accurate protection IGBT trouble free service.
The purpose of this utility model can realize by the following technical solutions:
The overcurrent cascade protection circuit of a kind of IGBT, it comprises dsp processor circuit, current comparison circuit, PWM drive circuit; Wherein said dsp processor circuit is connected with PWM drive circuit, current comparison circuit respectively; Described dsp processor circuit determines whether to lock PWM according to the current comparison circuit output signal and drives signal; Current comparison circuit is made up of several IGBT current comparison circuits, each IGBT current comparison circuit is formed by a comparator, four resistance and three electric capacity, be used for relatively IGBT current signal and the size of setting electric current, and will export the result and offer the dsp processor circuit; The pwm signal that the PWM drive circuit is used for the dsp processor circuit is produced amplifies, to drive the switch of IGBT.
Further optimize, the inverting input of comparator connects the current signal of IGBT by a resistance in the described IGBT current comparison circuit, and inverting input also connects an electric capacity, the other end ground connection of electric capacity simultaneously.
Further optimize, described resistance, electric capacity constitute a RC filter circuit.
Further optimize, the in-phase input end of comparator is connected with the bleeder circuit of being made up of two resistance and electric capacity in the described IGBT current comparison circuit.
Further optimize, the IGBT size of current that described several IGBT current comparison circuits are set is inconsistent, the dividing potential drop that is the bleeder circuit of being made up of two resistance and electric capacity that connects of each comparator in-phase input end varies in size, and is used for distinguishing different over-current signals.
Further optimize, described several IGBT current comparison circuits comprise two-way and above IGBT current comparison circuit.
The control method that is used for the overcurrent cascade protection circuit of described IGBT, specifically: the overcurrent cascade protection circuit of described IGBT is under normal operation, the IGBT current signal is less than the size of setting electric current, comparator inverting input voltage is lower than in-phase input end voltage, this moment, comparator was output as high level, did not produce the overcurrent protection signal;
When the IGBT current signal when setting size of current, comparator inverting input voltage is higher than in-phase input end voltage, this moment, the comparator output low level produced over-current signal.
Further, the output signal of described several IGBT current comparison circuits is input to respectively on the different trip protection pins of dsp processor.
Further, the trip protection signal of setting the bigger comparator output of current value is set to singly go out error protection, namely when the IGBT current signal is set current value greater than this, comparator inverting input voltage is higher than in-phase input end voltage, this moment, the comparator output low level produced over-current signal, and the dsp processor electric circuit inspection just locks PWM to this over-current signal and drives signal, PWM drives signal and no longer works, and enters guard mode;
The trip protection signal of setting the less comparator output of current value is set to the cycle and goes out error protection; namely when the IGBT current signal is set current value greater than this; comparator inverting input voltage is higher than in-phase input end voltage; this moment the comparator output low level; produce over-current signal; the dsp processor electric circuit inspection just locks PWM to this over-current signal and drives signal; after the IGBT current signal recovers normally; PWM driving signal does not lock and works on; while dsp processor circuit goes out error protection to the cycle and carries out analysis of accounts; if the setting-up time section cycle goes out the error protection number of times greater than dsp processor circuit set point number, then PWM is driven signal and lock always.
Compared with prior art, the utlity model has following beneficial effect:
1, circuit is simple and practical, and guard method is effective flexibly, has eliminated the influence of mistake protection to system's continuous operation greatly;
2, utilize the resource of existing general dsp chip, do not need to increase cost, have excellent economy;
3, to IGBT device protection and moment conveyance capacity take into account, make the application of IGBT obtain better protection;
4, the IGBT over-current signal is carried out the classification processing, taked different processing methods for over-current signal in various degree by hardware circuit or dsp software cooperation.
Description of drawings
Fig. 1 is the overcurrent cascade protection electrical schematic diagram of a kind of IGBT of execution mode.
Embodiment
Below in conjunction with specific embodiment the utility model is described further.
As shown in Figure 1, the overcurrent cascade protection circuit of a kind of IGBT, it comprises dsp processor circuit, current comparison circuit, PWM drive circuit; Wherein said dsp processor circuit is connected with PWM drive circuit, current comparison circuit respectively; Described dsp processor circuit determines whether to lock PWM according to current comparison circuit output signal TZ1, TZ2 and drives signal; Current comparison circuit is made up of two-way IGBT current comparison circuit, every road IGBT current comparison circuit is formed by a comparator, four resistance and three electric capacity, be used for relatively IGBT current signal and the size of setting electric current, and will export the result and offer the dsp processor circuit; The pwm signal that the PWM drive circuit is used for the dsp processor circuit is produced amplifies, to drive the switch of IGBT.
The inverting input 2 of the first comparator U2A connects the current signal 101 of IGBT in the described first via IGBT current comparison circuit by the 3rd resistance R 3, inverting input 2 also connects second capacitor C 2 simultaneously, the other end ground connection of second capacitor C 2, the output 1 of the first comparator U2A meets accessory power supply VCC by the 4th resistance R 4, by the 3rd capacitor C 3 ground connection; Described the 3rd resistance R 3, second capacitor C 2 constitute a RC filter circuit.
The in-phase input end 3 of the first comparator U2A is connected with the bleeder circuit of being made up of first resistance R 1, second resistance R 2 and first capacitor C 1 in the described first via IGBT current comparison circuit; Wherein first resistance R 1, second resistance R 2 and first capacitor C 1 all have another a termination accessory power supply VCC that terminates to in-phase input end 3, the first resistance R 1 of the first comparator U2A, the equal ground connection of the other end of the other end of second resistance R 2 and first capacitor C 1.
The inverting input 6 of the second comparator U2B connects the current signal 101 of IGBT in described the second road IGBT current comparison circuit by the 7th resistance R 7, inverting input 6 also connects the 5th capacitor C 5 simultaneously, the other end ground connection of the 5th capacitor C 5, the output 7 of the second comparator U2B meets accessory power supply VCC by the 8th resistance R 8, by the 6th capacitor C 6 ground connection; Described the 7th resistance R 7, the 6th capacitor C 6 constitute a RC filter circuit.
The in-phase input end 5 of the second comparator U2B is connected with the bleeder circuit of being made up of the 5th resistance R 5, the 6th resistance R 6 and the 4th capacitor C 4 in described the second road IGBT current comparison circuit; Wherein the 5th resistance R 5, the 6th resistance R 6 and the 4th capacitor C 4 all have another a termination accessory power supply VCC that terminates to in-phase input end 5, the five resistance R 5 of the second comparator U2B, the equal ground connection of the other end of the other end of the 6th resistance R 6 and the 4th capacitor C 4.
The IGBT size of current that described first, second road IGBT current comparison circuit is set is inconsistent, namely the dividing potential drop of the bleeder circuit of being made up of two resistance and electric capacity that connects of the first comparator U2A, the second comparator U2B in-phase input end varies in size, and is used for distinguishing different over-current signals.
The overcurrent cascade protection circuit of described IGBT is under normal operation, and the IGBT current signal is less than the size of setting electric current, and comparator inverting input voltage is lower than in-phase input end voltage, and this moment, comparator was output as high level, did not produce the overcurrent protection signal;
When the IGBT current signal when setting size of current, comparator inverting input voltage is higher than in-phase input end voltage, this moment, the comparator output low level produced over-current signal.
The output signal of described several IGBT current comparison circuits is input to respectively on the different trip protection pins of dsp processor;
The trip protection signal of setting the bigger comparator output of current value is set to singly go out error protection, namely when the IGBT current signal is set current value greater than this, comparator inverting input voltage is higher than in-phase input end voltage, this moment the comparator output low level, produce over-current signal, the dsp processor electric circuit inspection just locks PWM to this over-current signal and drives signal, and PWM drives signal and no longer works, and enters guard mode;
The trip protection signal of setting the less comparator output of current value is set to the cycle and goes out error protection; namely when the IGBT current signal is set current value greater than this; comparator inverting input voltage is higher than in-phase input end voltage; this moment the comparator output low level; produce over-current signal; the dsp processor electric circuit inspection just locks PWM to this over-current signal and drives signal; after the IGBT current signal recovers normally; PWM driving signal does not lock and works on; while dsp processor circuit goes out error protection to the cycle and carries out analysis of accounts; if section cycle set time goes out the error protection number of times greater than dsp processor circuit set point number, then PWM is driven signal and lock always.
The utility model can be set a bigger IGBT overcurrent comparison signal, and the overcurrent of meeting coup injury IGBT device is protected; Set a less IGBT overcurrent comparison signal, the overcurrent of IGBT device is carried out period protection, namely less overcurrent of moment appears in IGBT, then locks PWM and drives signal, and when the IGBT electric current changed normal current work over to, PWM drove signal and starts working again.
Those skilled in the art can make various modifications to this specific embodiment or replenish or adopt similar mode to substitute under the prerequisite of principle of the present utility model and essence, but these are changed and all fall into protection range of the present utility model.Therefore the utility model technical scope is not limited to above-described embodiment.
Claims (5)
1. the overcurrent cascade protection circuit of an IGBT is characterized in that comprising dsp processor circuit, current comparison circuit, PWM drive circuit; Wherein said dsp processor circuit is connected with PWM drive circuit, current comparison circuit respectively; Described dsp processor circuit determines whether to lock PWM according to the current comparison circuit output signal and drives signal; Current comparison circuit is made up of several IGBT current comparison circuits, each IGBT current comparison circuit is formed by a comparator, four resistance and three electric capacity, be used for relatively IGBT current signal and the size of setting electric current, and will export the result and offer the dsp processor circuit; The pwm signal that the PWM drive circuit is used for the dsp processor circuit is produced amplifies, to drive the switch of IGBT.
2. the overcurrent cascade protection circuit of a kind of IGBT according to claim 1; it is characterized in that the inverting input of comparator in the described IGBT current comparison circuit connects the current signal of IGBT by a resistance; inverting input also connects an electric capacity, the other end ground connection of electric capacity simultaneously.
3. the overcurrent cascade protection circuit of a kind of IGBT according to claim 1, the in-phase input end that it is characterized in that comparator in the described IGBT current comparison circuit is connected with the bleeder circuit of being made up of two resistance and electric capacity.
4. according to the overcurrent cascade protection circuit of the described IGBT of claim 3; the IGBT size of current that it is characterized in that described several IGBT current comparison circuits settings is inconsistent; the dividing potential drop that is the bleeder circuit of being made up of two resistance and electric capacity that connects of each comparator in-phase input end varies in size, and is used for distinguishing different over-current signals.
5. according to the overcurrent cascade protection circuit of the described IGBT of claim 1, it is characterized in that described several IGBT current comparison circuits comprise two-way and above IGBT current comparison circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320014915 CN203218868U (en) | 2013-01-12 | 2013-01-12 | Overcurrent cascade protection circuit of IGBT (Insulated Gate Bipolar Translator) |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320014915 CN203218868U (en) | 2013-01-12 | 2013-01-12 | Overcurrent cascade protection circuit of IGBT (Insulated Gate Bipolar Translator) |
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| CN203218868U true CN203218868U (en) | 2013-09-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320014915 Expired - Fee Related CN203218868U (en) | 2013-01-12 | 2013-01-12 | Overcurrent cascade protection circuit of IGBT (Insulated Gate Bipolar Translator) |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103078298A (en) * | 2013-01-12 | 2013-05-01 | 华南理工大学 | Overcurrent cascade protection circuit of IGBT (Insulated Gate Bipolar Translator) and control method thereof |
| CN103532090A (en) * | 2013-10-30 | 2014-01-22 | 沈阳君威新能科技有限公司 | Multilevel, online and adjustable overcurrent protection module |
-
2013
- 2013-01-12 CN CN 201320014915 patent/CN203218868U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103078298A (en) * | 2013-01-12 | 2013-05-01 | 华南理工大学 | Overcurrent cascade protection circuit of IGBT (Insulated Gate Bipolar Translator) and control method thereof |
| CN103078298B (en) * | 2013-01-12 | 2015-09-02 | 华南理工大学 | The overcurrent cascade protection circuit of a kind of IGBT and control method |
| CN103532090A (en) * | 2013-10-30 | 2014-01-22 | 沈阳君威新能科技有限公司 | Multilevel, online and adjustable overcurrent protection module |
| CN103532090B (en) * | 2013-10-30 | 2016-02-17 | 沈阳君威新能科技有限公司 | Overcurrent protection module that multistage in-line is adjustable |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130925 Termination date: 20200112 |