CN103078298B - The overcurrent cascade protection circuit of a kind of IGBT and control method - Google Patents
The overcurrent cascade protection circuit of a kind of IGBT and control method Download PDFInfo
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- CN103078298B CN103078298B CN201310010604.XA CN201310010604A CN103078298B CN 103078298 B CN103078298 B CN 103078298B CN 201310010604 A CN201310010604 A CN 201310010604A CN 103078298 B CN103078298 B CN 103078298B
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Abstract
The invention discloses overcurrent cascade protection circuit and the control method of a kind of IGBT, protective circuit comprises dsp processor circuit, current comparison circuit, PWM drive circuit; Wherein dsp processor circuit is connected with PWM drive circuit, current comparison circuit respectively; In described control method, in normal operating conditions, IGBT current signal is less than the size of setting electric current to the overcurrent cascade protection circuit of described IGBT, and comparator anti-phase input terminal voltage is lower than in-phase input end voltage, now comparator exports as high level, does not produce overcurrent protection signal; When IGBT current signal is greater than setting size of current, comparator anti-phase input terminal voltage is higher than in-phase input end voltage, and now comparator output low level, produces over-current signal.The present invention makes full use of the trip protection resource of DSP overcurrent protection, has carried out perfect protection to power device IGBT in power-supply system.
Description
Technical field
The present invention relates to a kind of high frequency switch power technical field, be specifically related to overcurrent cascade protection circuit and the control method of a kind of power device IGBT.
Background technology
In high-power power transformation system; normal employing IGBT device realizes transformation of electrical energy; the current protection technology of IGBT device becomes the important step of electrical conversion systems; also be one of reliability measurement index of electrical conversion systems; now general way is exactly by IGBT current signal and its trouble free service current ratio comparatively; exceed, protect, or period protection.Because the operating characteristic of IGBT allows temporary over-current; so exceed, the method protected; the work continuity of meeting influential system to a certain extent; because at welding and some electrochemical industry; electrical conversion systems to produce temporary over-current phenomenon, and be secondly also difficult to the advantage of the temporary over-current playing IGBT device, period protection then causes system always in discontinuous operation when the real fault of system; do not stop IGBT working, it is unfavorable also to produce IGBT device.
Summary of the invention
The object of the invention is the overcurrent cascade protection circuit and the control method that provide a kind of IGBT, to solve IGBT overcurrent protection problem in some transformation of electrical energy existing application.The present invention can analyze IGBT over-current signal, judgement system work whether normal, to reach the object of accurately protection IGBT trouble free service.
Object of the present invention can realize by the following technical solutions:
An overcurrent cascade protection circuit 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 lock PWM drive singal according to current comparison circuit output signal; Current comparison circuit is made up of several IGBT current comparison circuits, each IGBT current comparison circuit is by a comparator, four resistance and three electric capacity compositions, for comparing IGBT current signal and the size setting electric current, and Output rusults is supplied to dsp processor circuit; The pwm signal that PWM drive circuit is used for dsp processor circuit to produce amplifies, to drive the switch of IGBT.
Further optimization, in described IGBT current comparison circuit, the inverting input of comparator connects the current signal of IGBT by a resistance, and inverting input also connects an electric capacity, the other end ground connection of electric capacity simultaneously.
Further optimization, described resistance, electric capacity form a RC filter circuit.
Further optimization, in described IGBT current comparison circuit, the in-phase input end of comparator is connected with the bleeder circuit be made up of two resistance and electric capacity.
Further optimization, the IGBT size of current of described several IGBT current comparison circuits setting is inconsistent, namely the dividing potential drop of bleeder circuit be made up of two resistance and electric capacity that each comparator in-phase input end connects varies in size, and is used for the different over-current signal of difference.
Further optimization, several IGBT current comparison circuits described comprise two-way and above IGBT current comparison circuit.
For the control method of the overcurrent cascade protection circuit of described IGBT, specifically: the overcurrent cascade protection circuit of described IGBT in normal operating conditions, IGBT current signal is less than the size of setting electric current, comparator anti-phase input terminal voltage is lower than in-phase input end voltage, now comparator exports as high level, does not produce overcurrent protection signal;
When IGBT current signal is greater than setting size of current, comparator anti-phase input terminal voltage is higher than in-phase input end voltage, and now comparator output low level, produces over-current signal.
Further, the output signal of several IGBT current comparison circuits described is input on the different trip protection pins of dsp processor respectively.
Further, to the trip protection signal setting of the larger comparator output of current value be set as singly going out error protection, namely when IGBT current signal is greater than this setting current value, comparator anti-phase input terminal voltage is higher than in-phase input end voltage, now comparator output low level, produces over-current signal, and dsp processor electric circuit inspection is to this over-current signal just locking PWM drive singal, PWM drive singal no longer works, and enters guard mode;
The trip protection signal setting exported by comparator less for setting current value is the cycle go out error protection, namely when IGBT current signal is greater than this setting current value, comparator anti-phase input terminal voltage is higher than in-phase input end voltage, now comparator output low level, produce over-current signal, dsp processor electric circuit inspection is to this over-current signal just locking PWM drive singal, when IGBT current signal recovers normally, PWM drive singal does not lock and works on, simultaneously 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 error protection number of times be greater than dsp processor circuit configuration number of times, then PWM drive singal is locked always.
Compared with prior art, the present invention has following beneficial effect:
1, circuit is simple and practical, and guard method is effective flexibly, greatly eliminates the impact of protection on system continuous operation by mistake;
2, utilize the resource of existing general dsp chip, do not need to increase cost, there is good economy;
3, IGBT device protection and temporary over-current ability are taken into account, make the application of IGBT obtain better protection;
4, IGBT over-current signal has been carried out classification process, by hardware circuit or dsp software cooperation, different processing methods has been taked for over-current signal in various degree.
Accompanying drawing explanation
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 present invention will be further described.
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 outputs signal TZ1, TZ2 according to current comparison circuit and determines whether lock PWM drive singal; Current comparison circuit is made up of two-way IGBT current comparison circuit, every road IGBT current comparison circuit is by a comparator, four resistance and three electric capacity compositions, for comparing IGBT current signal and the size setting electric current, and Output rusults is supplied to dsp processor circuit; The pwm signal that PWM drive circuit is used for dsp processor circuit to produce amplifies, to drive the switch of IGBT.
In described first via IGBT current comparison circuit, the inverting input 2 of the first comparator U2A connects the current signal 101 of IGBT by the 3rd resistance R3, inverting input 2 also connects the second electric capacity C2 simultaneously, the other end ground connection of the second electric capacity C2, the output 1 of the first comparator U2A meets accessory power supply VCC by the 4th resistance R4, by the 3rd electric capacity C3 ground connection; Described 3rd resistance R3, the second electric capacity C2 form a RC filter circuit.
In described first via IGBT current comparison circuit, the in-phase input end 3 of the first comparator U2A is connected with the bleeder circuit be made up of the first resistance R1, the second resistance R2 and the first electric capacity C1; Wherein the first resistance R1, the second resistance R2 and the first electric capacity C1 all have an end to receive another termination accessory power supply VCC of in-phase input end 3, the first resistance R1 of the first comparator U2A, the other end of the second resistance R2 and the equal ground connection of the other end of the first electric capacity C1.
In described second road IGBT current comparison circuit, the inverting input 6 of the second comparator U2B connects the current signal 101 of IGBT by the 7th resistance R7, inverting input 6 also connects the 5th electric capacity C5 simultaneously, the other end ground connection of the 5th electric capacity C5, the output 7 of the second comparator U2B meets accessory power supply VCC by the 8th resistance R8, by the 6th electric capacity C6 ground connection; Described 7th resistance R7, the 6th electric capacity C6 form a RC filter circuit.
In described second road IGBT current comparison circuit, the in-phase input end 5 of the second comparator U2B is connected with the bleeder circuit be made up of the 5th resistance R5, the 6th resistance R6 and the 4th electric capacity C4; Wherein the 5th resistance R5, the 6th resistance R6 and the 4th electric capacity C4 all have an end to receive another termination accessory power supply VCC of in-phase input end the 5, five resistance R5 of the second comparator U2B, the other end of the 6th resistance R6 and the equal ground connection of the other end of the 4th electric capacity C4.
The IGBT size of current of first, second road described IGBT current comparison circuit setting is inconsistent, namely the dividing potential drop of bleeder circuit be made up of two resistance and electric capacity that the first comparator U2A, the second comparator U2B in-phase input end connect varies in size, and is used for the different over-current signal of difference.
In normal operating conditions, IGBT current signal is less than the size of setting electric current to the overcurrent cascade protection circuit of described IGBT, and comparator anti-phase input terminal voltage is lower than in-phase input end voltage, and now comparator exports as high level, does not produce overcurrent protection signal;
When IGBT current signal is greater than setting size of current, comparator anti-phase input terminal voltage is higher than in-phase input end voltage, and now comparator output low level, produces over-current signal.
The output signal of several IGBT current comparison circuits described is input on the different trip protection pins of dsp processor respectively;
To the trip protection signal setting of the larger comparator output of current value be set as singly going out error protection, namely when IGBT current signal is greater than this setting current value, comparator anti-phase input terminal voltage is higher than in-phase input end voltage, now comparator output low level, produce over-current signal, dsp processor electric circuit inspection is to this over-current signal just locking PWM drive singal, and PWM drive singal no longer works, and enters guard mode;
The trip protection signal setting exported by comparator less for setting current value is the cycle go out error protection, namely when IGBT current signal is greater than this setting current value, comparator anti-phase input terminal voltage is higher than in-phase input end voltage, now comparator output low level, produce over-current signal, dsp processor electric circuit inspection is to this over-current signal just locking PWM drive singal, when IGBT current signal recovers normally, PWM drive singal does not lock and works on, simultaneously dsp processor circuit goes out error protection to the cycle and carries out analysis of accounts, if section cycle set time goes out error protection number of times be greater than dsp processor circuit configuration number of times, then PWM drive singal is locked always.
The present invention can set a larger IGBT overcurrent comparison signal, protects the overcurrent of meeting coup injury IGBT device; Set a less IGBT overcurrent comparison signal, carry out period protection to the overcurrent of IGBT device, namely there is moment less overcurrent in IGBT, then lock PWM drive singal, and when IGBT electric current proceeds to normal current work, PWM drive singal is started working again.
Those skilled in the art can make various amendment to this specific embodiment or supplement or adopt similar mode to substitute under the prerequisite without prejudice to principle of the present invention and essence, but these changes all fall into protection scope of the present invention.Therefore the technology of the present invention scope is not limited to above-described embodiment.
Claims (1)
1. a control method for the overcurrent cascade protection circuit of IGBT, the overcurrent cascade protection circuit of described IGBT 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 lock PWM drive singal according to current comparison circuit output signal; Current comparison circuit is made up of several IGBT current comparison circuits, each IGBT current comparison circuit is by a comparator, four resistance and three electric capacity compositions, for comparing IGBT current signal and the size setting electric current, and Output rusults is supplied to dsp processor circuit; The pwm signal that PWM drive circuit is used for dsp processor circuit to produce amplifies, to drive the switch of IGBT; Several IGBT current comparison circuits described comprise two-way and above IGBT current comparison circuit; It is characterized in that, in normal operating conditions, IGBT current signal is less than the size of setting electric current to the overcurrent cascade protection circuit of described IGBT, and comparator anti-phase input terminal voltage is lower than in-phase input end voltage, now comparator exports as high level, does not produce overcurrent protection signal; When IGBT current signal is greater than setting size of current, comparator anti-phase input terminal voltage is higher than in-phase input end voltage, and now comparator output low level, produces over-current signal; The output signal of several IGBT current comparison circuits described is input on the different trip protection pins of dsp processor respectively;
Set a larger IGBT overcurrent comparison signal, to can the overcurrent of coup injury IGBT device protect; Set a less IGBT overcurrent comparison signal, period protection is carried out to the overcurrent of IGBT device; To the trip protection signal setting of the larger comparator output of current value be set as singly going out error protection, namely when IGBT current signal is greater than this setting current value, comparator anti-phase input terminal voltage is higher than in-phase input end voltage, now comparator output low level, produce over-current signal, dsp processor electric circuit inspection is to this over-current signal just locking PWM drive singal, and PWM drive singal no longer works, and enters guard mode;
The trip protection signal setting exported by comparator less for setting current value is the cycle go out error protection, namely when IGBT current signal is greater than this setting current value, comparator anti-phase input terminal voltage is higher than in-phase input end voltage, now comparator output low level, produce over-current signal, dsp processor electric circuit inspection is to this over-current signal just locking PWM drive singal, when IGBT current signal recovers normally, PWM drive singal does not lock and works on, simultaneously 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 error protection number of times be greater than dsp processor circuit configuration number of times, then PWM drive singal is locked always.
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| CN201310010604.XA CN103078298B (en) | 2013-01-12 | 2013-01-12 | The overcurrent cascade protection circuit of a kind of IGBT and control method |
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| CN201310010604.XA CN103078298B (en) | 2013-01-12 | 2013-01-12 | The overcurrent cascade protection circuit of a kind of IGBT and control method |
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| CN103078298B true CN103078298B (en) | 2015-09-02 |
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| CN108306261B (en) * | 2018-01-31 | 2019-10-25 | 广东美的制冷设备有限公司 | Intelligent power module guard method, circuit, readable storage medium storing program for executing and air conditioner |
| CN112671244B (en) * | 2020-12-03 | 2024-03-26 | 珠海格力电器股份有限公司 | Overcurrent protection device and method of BMS active equalization system and automobile |
| CN112290776B (en) | 2020-12-31 | 2021-06-08 | 江苏时代新能源科技有限公司 | Control method and device of voltage converter and voltage control system |
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| CN202094613U (en) * | 2011-06-02 | 2011-12-28 | 深圳市汇川技术股份有限公司 | IGBT current foldback circuit |
| CN202406055U (en) * | 2011-11-02 | 2012-08-29 | 哈尔滨九洲电气股份有限公司 | Photovoltaic grid connected inverter PWM controller |
| CN203218868U (en) * | 2013-01-12 | 2013-09-25 | 华南理工大学 | Overcurrent cascade protection circuit of IGBT (Insulated Gate Bipolar Translator) |
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| JP5750311B2 (en) * | 2011-05-31 | 2015-07-22 | 日立オートモティブシステムズ株式会社 | Inverter drive |
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| CN202094613U (en) * | 2011-06-02 | 2011-12-28 | 深圳市汇川技术股份有限公司 | IGBT current foldback circuit |
| CN202406055U (en) * | 2011-11-02 | 2012-08-29 | 哈尔滨九洲电气股份有限公司 | Photovoltaic grid connected inverter PWM controller |
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