CN201608514U - Overcurrent protection circuit used for insulating gate bipolar transistor - Google Patents
Overcurrent protection circuit used for insulating gate bipolar transistor Download PDFInfo
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- CN201608514U CN201608514U CN2009202519864U CN200920251986U CN201608514U CN 201608514 U CN201608514 U CN 201608514U CN 2009202519864 U CN2009202519864 U CN 2009202519864U CN 200920251986 U CN200920251986 U CN 200920251986U CN 201608514 U CN201608514 U CN 201608514U
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Abstract
The utility model relates to an overcurrent protection circuit used for an insulating gate bipolar transistor, consisting of a half-wave rectifier circuit, a signal analysis circuit and a signal processing circuit that are connected with one another, wherein the half-wave rectifier circuit comprises three-phase current sensors CON, CON2 and CON3, resistors R3, R4 and R5, diodes D1, D2 and D3 and a capacitor C2 that are connected with one another; the signal analysis circuit consists of resistors R1, R2, R6, R7 and R8, a capacitor C3, adjustable resistors P1 and P3, an operation amplifier U1A and a power supply of +5V that are connected with one another; and the signal processing circuit consists of resistors R9, R10 and R11, an adjustable resistor P2, a capacitor C1, an electrolytic capacitor E1, an operation amplifier U1B and a power supply of +5V that are connected with one another. In the utility model, the circuit structure has reasonable design, strong practicability, low manufacturing cost, strong interference resistance, adjustable circuit, stable and reliable circuit and wide application range.
Description
Technical field
The utility model relates to a kind of current foldback circuit, particularly a kind of current foldback circuit that is used for igbt.
Background technology
Igbt (IGBT) is widely applied in places such as frequency converter and active power filters.In the process of using IGBT, a series of problems have been found, for example overcurrent protection, overvoltage protection and driving etc.This application level to the IGBT device, the device work reliable and stable, have a direct impact to a great extent.Therefore, in power application electronic technology process, an appropriate design and the application that key issue is exactly a protective circuit.Thereby circuit that should be reasonable in design according to concrete Devices Characteristics in the practical application is to realize effective reliable protection.
The utility model content
The purpose of this utility model is to provide a kind of circuit structure design reasonable, practical, its low cost of manufacture, and antijamming capability is strong, and circuit is adjustable, and is stable and reliable for performance, the current foldback circuit that is used for IGBT that the scope of application is extensive.
The technical scheme that the utility model adopted is for achieving the above object: a kind of current foldback circuit that is used for igbt is characterized in that: this circuit is by half-wave rectifying circuit, signal evaluation circuit, and signal processing circuit connects to form; 3 of A phase current transducer CON1 in the described half-wave rectifying circuit, 4 ends are the two ends of connecting resistance R3 respectively, the 4 end ground connection of CON1, the anode of diode D1 connects 3 ends of CON1, negative electrode connects capacitor C 2, capacitor C 2 other end ground connection, 3 of B phase current transducer CON2,4 ends are the two ends of connecting resistance R4 respectively, the 4 end ground connection of current sensor CON2, the anode of diode D2 connects 3 ends of current sensor CON2, negative electrode connects diode D1 negative electrode, 3 of C phase current transducer CON3,4 ends are the two ends of connecting resistance R5 respectively, the 4 end ground connection of current sensor CON2, the anode of diode D3 connects 3 ends of current sensor CON3, and diode D3 negative electrode connects diode D1 negative electrode; The negative electrode of the 1 terminating diode D1 of adjustable resistance P1 in the described signal evaluation circuit, 2 terminations, 3 ends, 3 terminating resistor R7, one end, the positive input of resistance R 7 another termination operational amplifier U1A, 4 pin ground connection, 8 pin of operational amplifier U1A connect+the 5V power supply, 1 end of one termination P1 of resistance R 6, resistance R 6 other end ground connection, 3 ends of one termination P1 of capacitor C 3, capacitor C 3 other end ground connection, 2 terminations, 3 ends of adjustable resistance P3, the reverse input end of the 1 termination operational amplifier U1A of adjustable resistance P3, adjustable resistance 3 end ground connection, the reverse input end of resistance R 8 one termination operational amplifier U1A, resistance R 8 another termination+5V power supplys, resistance R 1 one termination operational amplifier U1A positive inputs, resistance R 1 other end connecting resistance R2, resistance R 2 another termination operational amplifier U1A outputs; The output of resistance R 9 one termination operational amplifier U1A in its described signal processing circuit, the reverse input end of resistance R 9 another termination operational amplifier U1B, the 1 end ground connection of adjustable resistance P2,3 terminations of adjustable resistance P2+5V power supply, the 2 terminating resistor resistance R 10 of adjustable resistance P2, the positive input of resistance R 10 another termination operational amplifier U1B, 4 pin ground connection, 8 pin of operational amplifier U1B connect+the 5V power supply, the reverse input end of resistance R 11 1 termination operational amplifier U1B, the negative pole of resistance R 11 another termination electrochemical capacitor E1, electrochemical capacitor E1 positive pole connects+the 5V power supply, the reverse input end of capacitor C 1 one termination operational amplifier U1B, capacitor C 1 another termination operational amplifier U1B output.
The beneficial effects of the utility model are: its circuit is simple, and is reasonable in design, is suitable for strong operability.Low cost of manufacture uses energy consumption low, is difficult for disturbing other circuit or is disturbed by other circuit, and stable and reliable for performance, the scope of application is extensive.
Description of drawings
Fig. 1 is the schematic diagram of the utility model circuit.
Embodiment
Below in conjunction with accompanying drawing and preferred embodiment, details are as follows to embodiment, structure, feature that foundation the utility model provides:
Referring to Fig. 1, a kind of current foldback circuit that is used for igbt is characterized in that: this circuit is by half-wave rectifying circuit, signal evaluation circuit, and signal processing circuit connects to form; 3 of A phase current transducer CON1 in the described half-wave rectifying circuit, 4 ends are the two ends of connecting resistance R3 respectively, the 4 end ground connection of CON1, the anode of diode D1 connects 3 ends of CON1, negative electrode connects capacitor C 2, capacitor C 2 other end ground connection, 3 of B phase current transducer CON2,4 ends are the two ends of connecting resistance R4 respectively, the 4 end ground connection of current sensor CON2, the anode of diode D2 connects 3 ends of current sensor CON2, negative electrode connects diode D1 negative electrode, 3 of C phase current transducer CON3,4 ends are the two ends of connecting resistance R5 respectively, the 4 end ground connection of current sensor CON2, the anode of diode D3 connects 3 ends of current sensor CON3, and diode D3 negative electrode connects diode D1 negative electrode; The negative electrode of the 1 terminating diode D1 of adjustable resistance P1 in the described signal evaluation circuit, 2 terminations, 3 ends, 3 terminating resistor R7, one end, the positive input of resistance R 7 another termination operational amplifier U1A, 4 pin ground connection, 8 pin of operational amplifier U1A connect+the 5V power supply, 1 end of one termination P1 of resistance R 6, resistance R 6 other end ground connection, 3 ends of one termination P1 of capacitor C 3, capacitor C 3 other end ground connection, 2 terminations, 3 ends of adjustable resistance P3, the reverse input end of the 1 termination operational amplifier U1A of adjustable resistance P3, adjustable resistance 3 end ground connection, the reverse input end of resistance R 8 one termination operational amplifier U1A, resistance R 8 another termination+5V power supplys, resistance R 1 one termination operational amplifier U1A positive inputs, resistance R 1 other end connecting resistance R2, resistance R 2 another termination operational amplifier U1A outputs; The output of resistance R 9 one termination operational amplifier U1A in its described signal processing circuit, the reverse input end of resistance R 9 another termination operational amplifier U1B, the 1 end ground connection of adjustable resistance P2,3 terminations of adjustable resistance P2+5V power supply, the 2 terminating resistor resistance R 10 of adjustable resistance P2, the positive input of resistance R 10 another termination operational amplifier U1B, 4 pin ground connection, 8 pin of operational amplifier U1B connect+the 5V power supply, the reverse input end of resistance R 11 1 termination operational amplifier U1B, the negative pole of resistance R 11 another termination electrochemical capacitor E1, electrochemical capacitor E1 positive pole connects+the 5V power supply, the reverse input end of capacitor C 1 one termination operational amplifier U1B, capacitor C 1 another termination operational amplifier U1B output.
Main component parameter is for example selected:
Resistance parameter: R1 and R2 resistance are 205k Ω, and R3, R4 and R5 resistance are 1k Ω, and R6 and R7 resistance are 5k Ω, and the R8 resistance is 3.3k Ω, and R9, R10 and R11 resistance are 5.1k Ω;
Capacitance parameter: C1 and C3 appearance value are 0.1 μ F, and C2 appearance value is 10nF;
The electrochemical capacitor parameter: E1 appearance value is 470 μ F;
The diode model is 4148;
The operational amplifier model is LM358;
The adjustable resistance resistance is 0～10k Ω.
Operation principle: this circuit is provided with an input and an output.Circuit is divided into three parts, and first is a half-wave rectifying circuit: current sensor CON1, CON2, CON3 carry out halfwave rectifier according to major loop three-phase current input three-phase voltage signal by diode D1, D2, D3, and capacitor C 2 filtering produce direct current signal; Second portion is a signal processing circuit: regulate the charging sensitivity of adjustable resistance P1 control capacittance C3, capacitor C 3 is by resistance R 6 discharges, + 5V power supply provides a bias voltage through adjustable resistance P3 and resistance R 8 dividing potential drops for operational amplifier U1A reverse input end, bias voltage can be regulated by adjustable resistance P3, resistance R 7, R1, R2 and operational amplifier U1A form discharge circuit, operational amplifier U1A output high level when overcurrent takes place; Third part is a signal processing circuit :+5V power supply provides a less bias voltage by adjustable resistance P2 and R10 for operational amplifier U1B reverse input end, misoperation that this bias voltage prevents circuit owing to disturb, resistance R 9 capacitor C 2 are formed discharge circuit with operational amplifier U1B, when operational amplifier U1A output high level during overcurrent operational amplifier U1B output low level as output, output connects the IGBT gate pole, IGBT is turn-offed, when electric current just often is output as high level, provide high level by electrochemical capacitor E1 and resistance R 11 for operational amplifier U1B reverse input end at circuit powered on moment+5V power supply, make to be output as low level and to pin IGBT and do not work, provide a time for circuit according to the E1 charging interval.
Above-mentionedly the current foldback circuit that this is used for igbt is described in detail with reference to example; be illustrative rather than determinate; therefore in the variation and the modification that do not break away under the utility model general plotting, should belong within the protection range of the present utility model.
Claims (1)
1. current foldback circuit that is used for igbt is characterized in that: this circuit is by half-wave rectifying circuit, signal evaluation circuit, and signal processing circuit connects to form; 3 of A phase current transducer CON1 in the described half-wave rectifying circuit, 4 ends are the two ends of connecting resistance R3 respectively, the 4 end ground connection of CON1, the anode of diode D1 connects 3 ends of CON1, negative electrode connects capacitor C 2, capacitor C 2 other end ground connection, 3 of B phase current transducer CON2,4 ends are the two ends of connecting resistance R4 respectively, the 4 end ground connection of current sensor CON2, the anode of diode D2 connects 3 ends of current sensor CON2, negative electrode connects diode D1 negative electrode, 3 of C phase current transducer CON3,4 ends are the two ends of connecting resistance R5 respectively, the 4 end ground connection of current sensor CON2, the anode of diode D3 connects 3 ends of current sensor CON3, and diode D3 negative electrode connects diode D1 negative electrode; The negative electrode of the 1 terminating diode D1 of adjustable resistance P1 in the described signal evaluation circuit, 2 terminations, 3 ends, 3 terminating resistor R7, one end, the positive input of resistance R 7 another termination operational amplifier U1A, 4 pin ground connection, 8 pin of operational amplifier U1A connect+the 5V power supply, 1 end of one termination P1 of resistance R 6, resistance R 6 other end ground connection, 3 ends of one termination P1 of capacitor C 3, capacitor C 3 other end ground connection, 2 terminations, 3 ends of adjustable resistance P3, the reverse input end of the 1 termination operational amplifier U1A of adjustable resistance P3, adjustable resistance 3 end ground connection, the reverse input end of resistance R 8 one termination operational amplifier U1A, resistance R 8 another termination+5V power supplys, resistance R 1 one termination operational amplifier U1A positive inputs, resistance R 1 other end connecting resistance R2, resistance R 2 another termination operational amplifier U1A outputs; The output of resistance R 9 one termination operational amplifier U1A in its described signal processing circuit, the reverse input end of resistance R 9 another termination operational amplifier U1B, the 1 end ground connection of adjustable resistance P2,3 terminations of adjustable resistance P2+5V power supply, the 2 terminating resistor resistance R 10 of adjustable resistance P2, the positive input of resistance R 10 another termination operational amplifier U1B, 4 pin ground connection, 8 pin of operational amplifier U1B connect+the 5V power supply, the reverse input end of resistance R 11 1 termination operational amplifier U1B, the negative pole of resistance R 11 another termination electrochemical capacitor E1, electrochemical capacitor E1 positive pole connects+the 5V power supply, the reverse input end of capacitor C 1 one termination operational amplifier U1B, capacitor C 1 another termination operational amplifier U1B output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202519864U CN201608514U (en) | 2009-12-25 | 2009-12-25 | Overcurrent protection circuit used for insulating gate bipolar transistor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202519864U CN201608514U (en) | 2009-12-25 | 2009-12-25 | Overcurrent protection circuit used for insulating gate bipolar transistor |
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| Publication Number | Publication Date |
|---|---|
| CN201608514U true CN201608514U (en) | 2010-10-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202519864U Expired - Fee Related CN201608514U (en) | 2009-12-25 | 2009-12-25 | Overcurrent protection circuit used for insulating gate bipolar transistor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101777756A (en) * | 2009-12-25 | 2010-07-14 | 天津市诺尔电气有限公司 | Over-current protection circuit for insulated gate bipolar transistor |
| CN102856898A (en) * | 2011-06-30 | 2013-01-02 | 苏菠 | Constant active power control circuit of single phase alternating current fan and water pump |
| CN107527601A (en) * | 2017-09-28 | 2017-12-29 | 深圳市华星光电技术有限公司 | The circuit overcurrent protection and method and liquid crystal display device of GOA circuits |
-
2009
- 2009-12-25 CN CN2009202519864U patent/CN201608514U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101777756A (en) * | 2009-12-25 | 2010-07-14 | 天津市诺尔电气有限公司 | Over-current protection circuit for insulated gate bipolar transistor |
| CN101777756B (en) * | 2009-12-25 | 2013-06-05 | 天津诺尔哈顿电器制造有限公司 | Over-current protection circuit for insulated gate bipolar transistor |
| CN102856898A (en) * | 2011-06-30 | 2013-01-02 | 苏菠 | Constant active power control circuit of single phase alternating current fan and water pump |
| CN107527601A (en) * | 2017-09-28 | 2017-12-29 | 深圳市华星光电技术有限公司 | The circuit overcurrent protection and method and liquid crystal display device of GOA circuits |
| CN107527601B (en) * | 2017-09-28 | 2020-01-31 | 深圳市华星光电技术有限公司 | Overcurrent protection circuit and method of GOA circuit and liquid crystal display device |
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Legal Events
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: TIANJIN NOLE ELECTRICITY CO., LTD. Free format text: FORMER NAME: TIANJIN NUOERHADUN ELECTRIC CO., LTD. Owner name: TIANJIN NUOERHADUN ELECTRIC CO., LTD. Free format text: FORMER NAME: TIANJIN NOLE ELECTRICITY CO., LTD. |
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| CP01 | Change in the name or title of a patent holder |
Address after: 300000 Tianjin city Xiqing District Jintai Road No. 6 (Dasi) Patentee after: TIANJIN NOLE ELECTRIC Co.,Ltd. Address before: 300000 Tianjin city Xiqing District Jintai Road No. 6 (Dasi) Patentee before: Tianjin Knoll Hatton Electric Co.,Ltd. |
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| CP03 | Change of name, title or address |
Address after: 300000 Tianjin city Xiqing District Jintai Road No. 6 (Dasi) Patentee after: Tianjin Knoll Hatton Electric Co.,Ltd. Address before: 300381 Tianjin City, Xiqing Economic Development Zone Industrial Park Ze Road No. 20 Hung Temple Patentee before: Tianjin Nuoerhatun Electric Manufacturing Co.,Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101013 Termination date: 20141225 |
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| EXPY | Termination of patent right or utility model |