CN203660518U - Insulated gate bipolar transistor overcurrent protection circuit - Google Patents
Insulated gate bipolar transistor overcurrent protection circuit Download PDFInfo
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- CN203660518U CN203660518U CN201320865468.8U CN201320865468U CN203660518U CN 203660518 U CN203660518 U CN 203660518U CN 201320865468 U CN201320865468 U CN 201320865468U CN 203660518 U CN203660518 U CN 203660518U
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Abstract
The utility model relates to the technical field of protection circuits and particularly relates to an insulated gate bipolar transistor overcurrent protection circuit. The insulated gate bipolar transistor overcurrent protection circuit comprises a current mutual inductance circuit, an amplifying circuit, a half-wave rectifier circuit, a hysteresis comparison circuit and a clamping circuit, wherein the current mutual inductance circuit is connected with the insulated gate bipolar transistor; the amplifying circuit is connected with the current mutual inductance circuit; the half-wave rectifier circuit is connected with the amplifying circuit; the hysteresis comparison circuit is connected with the half-wave rectifier circuit; and the clamping circuit is respectively connected with the hysteresis comparison circuit and the insulated gate bipolar transistor component. The insulated gate bipolar transistor overcurrent protection circuit is composed of five small circuits, that is, the current mutual inductance circuit, the amplifying circuit, the half-wave rectifier circuit, the hysteresis comparison circuit and the clamping circuit, overcurrent protection on the insulated gate bipolar transistor can be realized in the condition where no controller participates in protection, the cost is low, and wide application in the industry is facilitated.
Description
Technical field
The utility model relates to protective circuit technical field, particularly a kind of igbt current foldback circuit.
Background technology
The implementation of igbt overcurrent protection is at present mainly to connect with igbt with resistance or current transformer, detects the electric current that flows through the integrated utmost point of igbt or emitter.In the time detecting and determine igbt overcurrent; carry out corresponding safeguard measure; such as closing igbt output; the methods such as the pulse duration of igbt conducting are controlled in minimizing; differentiation and implementation will and be sent control command by controller sampling, computing; or realize circuit structure complexity completely with complicated analog circuit.In addition; the overcurrent protection of igbt can also drive protection chip to realize by the special isolation grid bipolar transistor with comprehensive protection function; as M57962L of the EXB841 of Fuji, Mitsubishi etc.; thisly be mainly used in high-power applications occasion by special driving protection chip, cost is higher.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of simple in structure, can stablize the igbt current foldback circuit that igbt is protected.
For solving the problems of the technologies described above; the utility model provides a kind of igbt current foldback circuit, comprising: the first igbt Q1, the second igbt Q2, Current Mutual Inductance circuit, amplifying circuit, half-wave rectifying circuit, hysteresis comparator circuit and clamp circuit.Described Current Mutual Inductance circuit is connected with described the first igbt Q1 and the second igbt Q2, for from described the first igbt Q1 and the second igbt Q2 induction pressure drop and obtain the output current of described the first igbt Q1 and the second igbt Q2.Described amplifying circuit is connected with described Current Mutual Inductance circuit, and described output current is delivered to described amplifying circuit, and described output current is carried out to convergent-divergent processing by linear relationship.Described half-wave rectifying circuit is connected with described amplifying circuit, for the voltage signal of described amplifying circuit is carried out to halfwave rectifier.Described hysteresis comparator circuit is connected with described half-wave rectifying circuit, relatively sluggish for the unidirectional voltage of described half-wave rectifying circuit output being carried out to double threshold.Described clamp circuit is connected with described hysteresis comparator circuit and described the first igbt Q1 and the second igbt Q2 respectively, for and control the unlatching of described the first igbt Q1 and the second igbt Q2 or close.
Further, described Current Mutual Inductance circuit comprises: the first Current Transmit 1, the second Current Transmit 2, the first resistance R 1, the second resistance R 2.。Described the first Current Transmit 1 is placed on the emitter place of described the first igbt Q1, and the two ends of described the first Current Transmit 1 are connected with described amplifying circuit respectively; Described the first resistance R 1 is connected in parallel on the two ends of described the first Current Transmit 1.Described the second Current Transmit 2 is placed on the emitter place of described the second igbt Q2, and the two ends of described the second Current Transmit 2 are connected with described amplifying circuit respectively; Described the second resistance R 2 is connected in parallel on the two ends of described the second Current Transmit 2.
Further, described amplifying circuit comprises: the first operational amplifier A 1, the second operational amplifier A 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7, the 8th resistance R 8, the 9th resistance R 9, the tenth resistance R 10, the first capacitor C 1, the second capacitor C 2, the 3rd capacitor C 3 and the 4th capacitor C 4.Described the 3rd resistance R 3 is connected in parallel with described the first capacitor C 1, and the two ends of described the 3rd resistance R 3 and described the first capacitor C 1 are connected with reverse input end and the output of described the first operational amplifier A 1 respectively; One end of described the second Current Transmit 2 is connected with the reverse input end of described the first operational amplifier A 1 by described the 4th resistance R 4, and the other end of described the second Current Transmit 2 is connected with the positive input of described the first operational amplifier A 1 by described the 5th resistance R 5; The positive input of described the first operational amplifier A 1 is by described the 6th resistance R 6 ground connection; One end of described the second capacitor C 2 is connected with the positive input of described the first operational amplifier A 1, other end ground connection; The output of described the first operational amplifier A 1 is connected with described half-wave rectifying circuit.Described the 7th resistance R 7 is connected in parallel with described the 3rd capacitor C 3, and the two ends of described the 7th resistance R 7 and described the 3rd capacitor C 3 are connected with reverse input end and the output of described the second operational amplifier A 2 respectively; One end of described the first Current Transmit 1 is connected with the reverse input end of described the second operational amplifier A 2 by described the 8th resistance R 8, and the other end of described the first Current Transmit 1 is connected with the positive input of described the second operational amplifier A 2 by described the 9th resistance R 9; The positive input of described the second operational amplifier A 2 is by described the tenth resistance R 10 ground connection; One end of described the 4th capacitor C 4 is connected with the positive input of described the second operational amplifier A 2, other end ground connection; The output of described the second operational amplifier A 2 is connected with described half-wave rectifying circuit.
Further, described half-wave rectifying circuit comprises: the 11 resistance R the 11, the 12 resistance R the 12, the 13 resistance R the 13, the 14 resistance R 14, the 3rd operational amplifier A 3, four-operational amplifier A4, the first diode D1 and the second diode D2.The output of described the first operational amplifier A 1 is connected with the reverse input end of described the 3rd operational amplifier A 3 by described the 12 resistance R 12; The positive input ground connection of described the 3rd operational amplifier A 3; The output of described the 3rd operational amplifier A 3 is connected with described hysteresis comparator circuit by described the first diode D1; One end of described the 11 resistance R 11 is connected with the reverse input end of described the 3rd operational amplifier A 3, and the other end is connected with the output of described the first diode D1.The output of described the second operational amplifier A 2 is connected with the reverse input end of described four-operational amplifier A4 by described the 14 resistance R 14; The positive input ground connection of described four-operational amplifier A4; The output of described four-operational amplifier A4 is connected with described hysteresis comparator circuit by described the second diode D2; One end of described the 13 resistance R 13 is connected with the reverse input end of described four-operational amplifier A4, and the other end is connected with the output of described the second diode D2.
Further, described hysteresis comparator circuit comprises: the 15 resistance R the 15, the 16 resistance R the 16, the 17 resistance R the 17, the 18 resistance R the 18, the 19 resistance R 19, the 5th operational amplifier A 5 and the 5th capacitor C 5.One end of described the 15 resistance R 15 is connected with power supply, and the other end is connected with the output of described the 5th operational amplifier A 5; One end of described the 16 resistance R 16 is connected with power supply, and the other end is connected with the positive input of described the 5th operational amplifier A 5.One end of described the 17 resistance R 17 is connected with the positive input of described the 5th operational amplifier A 5, and the other end is connected with the output of described the 5th operational amplifier A 5; One end ground connection of described the 18 resistance R 18, the other end is connected with the positive input of described the 5th operational amplifier A 5.The output of described the first diode D1 and the second diode D2 is connected with the reverse input end of described the 5th operational amplifier A 5 by described the 19 resistance R 19 respectively; One end of described the 5th capacitor C 5 is connected with the reverse input end of described the 5th operational amplifier A 5, other end ground connection; The output of described the 5th operational amplifier A 5 is connected with described clamp circuit.
Further, described clamp circuit comprises: PWM1 port, PWM2 port, the 20 resistance R the 20, the 21 resistance R the 21, the 22 resistance R the 22, the 23 resistance R 23, the 3rd diode D3 and the 4th diode D4.Described PWM1 port is connected with the input of described the 3rd diode D3 by described the 21 resistance R 21; The input of described the 3rd diode D3 is by described the 20 resistance R 20 ground connection; The input of described the 3rd diode D3 is connected with described the first igbt Q1; Described PWM2 port is connected with the input of described the 4th diode D4 by described the 22 resistance R 22.The input of described the 4th diode D4 is by described the 23 resistance R 23 ground connection; The input of described the 4th diode D4 is connected with described the second igbt Q2; The output of described the 3rd diode D3 is connected with the output of described the 4th diode D4; The output of the output of described the 3rd diode D3 and described the 4th diode D4 is all connected with the output of described the 5th operational amplifier A 5.
The igbt current foldback circuit that the utility model provides; adopt Current Mutual Inductance circuit, amplifying circuit, half-wave rectifying circuit, hysteresis comparator circuit and five miniature circuit compositions of clamp circuit; simple in structure; can in the situation that there is no controller participation protective, realize the overcurrent protection to igbt; cost is lower, is convenient in industrial extensive use.
Accompanying drawing explanation
The igbt current foldback circuit structure chart that Fig. 1 provides for the utility model embodiment.
Embodiment
Referring to Fig. 1; a kind of igbt current foldback circuit that the utility model embodiment provides, comprising: the first igbt Q1, the second igbt Q2, Current Mutual Inductance circuit, amplifying circuit 20, half-wave rectifying circuit 30, hysteresis comparator circuit 40 and clamp circuit 10.On the first igbt Q1, the second igbt Q2, be connected with negative DC bus BUS-and output voltage LOUT binding post in positive direct-current bus BUS+, the electric power main circuit in electric power main circuit.Current Mutual Inductance circuit is connected with the first igbt Q1 and the second igbt Q2, for from the first igbt Q1 and the second igbt Q2 induction pressure drop and obtain the output current of the first igbt Q1 and the second igbt Q2; Amplifying circuit 20 is connected with Current Mutual Inductance circuit, and output current is delivered to amplifying circuit 20, and output current is carried out to convergent-divergent processing by linear relationship; Half-wave rectifying circuit 30 is connected with amplifying circuit 20, for the voltage signal of amplifying circuit 20 is carried out to halfwave rectifier; Hysteresis comparator circuit 40 is connected with half-wave rectifying circuit 30, carries out double threshold sluggishness relatively for the unidirectional voltage that half-wave rectifying circuit 30 is exported; Clamp circuit 10 is connected with hysteresis comparator circuit 40 and the first igbt Q1 and the second igbt Q2 respectively, for and control the unlatching of the first igbt Q1 and the second igbt Q2 or close.The structure of the igbt current foldback circuit further the utility model embodiment being provided is below introduced:
Current Mutual Inductance circuit comprises: the first Current Transmit 1, the second Current Transmit 2, the first resistance R 1, the second resistance R 2.Amplifying circuit 20 comprises: the first operational amplifier A 1, the second operational amplifier A 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7, the 8th resistance R 8, the 9th resistance R 9, the tenth resistance R 10, the first capacitor C 1, the second capacitor C 2, the 3rd capacitor C 3 and the 4th capacitor C 4.Half-wave rectifying circuit 30 comprises: the 11 resistance R the 11, the 12 resistance R the 12, the 13 resistance R the 13, the 14 resistance R 14, the 3rd operational amplifier A 3, four-operational amplifier A4, the first diode D1 and the second diode D2.Hysteresis comparator circuit 40 comprises: the 15 resistance R the 15, the 16 resistance R the 16, the 17 resistance R the 17, the 18 resistance R the 18, the 19 resistance R 19, the 5th operational amplifier A 5 and the 5th capacitor C 5.Clamp circuit 10 comprises: PWM1 port, PWM2 port, the 20 resistance R the 20, the 21 resistance R the 21, the 22 resistance R the 22, the 23 resistance R 23, the 3rd diode D3 and the 4th diode D4.The first Current Transmit 1 is placed on the emitter place of the first igbt Q1, and described the first resistance R 1 is connected in parallel on the two ends of the first Current Transmit 1.The second Current Transmit 2 is placed on the emitter place of the second igbt Q2, and the second resistance R 2 is connected in parallel on the two ends of the second Current Transmit 2.The 3rd resistance R 3 and the first capacitor C 1 are connected in parallel, and the two ends of the 3rd resistance R 3 and the first capacitor C 1 are connected with reverse input end and the output of the first operational amplifier A 1 respectively; One end of the second Current Transmit 2 is connected with the reverse input end of the first operational amplifier A 1 by the 4th resistance R 4, and the other end of the second Current Transmit 2 is connected with the positive input of the first operational amplifier A 1 by the 5th resistance R 5.The positive input of the first operational amplifier A 1 is by the 6th resistance R 6 ground connection; One end of the second capacitor C 2 is connected with the positive input of the first operational amplifier A 1, other end ground connection.The 7th resistance R 7 and the 3rd capacitor C 3 are connected in parallel, and the two ends of the 7th resistance R 7 and the 3rd capacitor C 3 are connected with reverse input end and the output of the second operational amplifier A 2 respectively; One end of the first Current Transmit 1 is connected with the reverse input end of the second operational amplifier A 2 by the 8th resistance R 8, and the other end of the first Current Transmit 1 is connected with the positive input of the second operational amplifier A 2 by the 9th resistance R 9; The positive input of the second operational amplifier A 2 is by the tenth resistance R 10 ground connection.One end of the 4th capacitor C 4 is connected with the positive input of the second operational amplifier A 2, other end ground connection.The output of the first operational amplifier A 1 is connected with the reverse input end of the 3rd operational amplifier A 3 by the 12 resistance R 12; The positive input ground connection of the 3rd operational amplifier A 3.One end of the 11 resistance R 11 is connected with the reverse input end of the 3rd operational amplifier A 3, and the other end is connected with the output of the first diode D1.The output of the second operational amplifier A 2 is connected with the reverse input end of four-operational amplifier A4 by the 14 resistance R 14; The positive input ground connection of four-operational amplifier A4.One end of the 13 resistance R 13 is connected with the reverse input end of four-operational amplifier A4, and the other end is connected with the output of the second diode D2.One end of the 15 resistance R 15 is connected with power supply, and the other end is connected with the output of the 5th operational amplifier A 5; One end of the 16 resistance R 16 is connected with power supply, and the other end is connected with the positive input of the 5th operational amplifier A 5; One end of the 17 resistance R 17 is connected with the positive input of the 5th operational amplifier A 5, and the other end is connected with the output of the 5th operational amplifier A 5; One end ground connection of the 18 resistance R 18, the other end is connected with the positive input of the 5th operational amplifier A 5; The output of the first diode D1 and the second diode D2 is connected with the reverse input end of the 5th operational amplifier A 5 by the 19 resistance R 19 respectively; One end of the 5th capacitor C 5 is connected with the reverse input end of the 5th operational amplifier A 5, other end ground connection.PWM1 port is connected with the input of the 3rd diode D3 by the 21 resistance R 21; The input of the 3rd diode D3 is by the 20 resistance R 20 ground connection; The input of the 3rd diode D3 is connected PWM2 port and is connected with the input of the 4th diode D4 by the 22 resistance R 22 with the first igbt Q1.The input of the 4th diode D4 is by the 23 resistance R 23 ground connection.The input of the 4th diode D4 is connected with the second igbt Q2; The output of the 3rd diode D3 is connected with the output of the 4th diode D4; The output of the output of the 3rd diode D3 and the 4th diode D4 is all connected with the output of the 5th operational amplifier A 5.
The igbt current foldback circuit that the utility model embodiment provides is in the time of work; suppose that the first igbt Q1 starts conducting; the second igbt Q2 turn-offs; now the second Current Transmit 2 detects electric current; form potential difference at the first resistance R 1 two ends; and along with the electric current of the first igbt Q1 increases and increases gradually, and then make the corresponding increase of output voltage of amplifying circuit and half-wave rectifying circuit.In the time that the output voltage of half-wave rectifying circuit is greater than the limiting voltage of setting, hysteresis comparator circuit output low level, clamp circuit drags down the control signal of PWM1 port and the output of PWM2 port, and the first igbt Q1 and the second igbt Q2 are turn-offed.In the time of the current reduction of the first igbt element Q1, the first resistance R 17 two ends potential differences start to reduce, and then make corresponding the reducing of output voltage of amplifying circuit and half-wave rectifying circuit.In the time that the output voltage of half-wave rectifying circuit is less than the limiting voltage of setting, hysteresis comparator circuit recovers high level, clamp circuit is not worked, the pulse of PWM1 port and the output of PWM2 port is normally applied to the driving of the first igbt Q1 and the second igbt Q2, and the first igbt Q1 and the second igbt Q2 normally work.
The igbt current foldback circuit that the utility model provides; adopt Current Mutual Inductance circuit, amplifying circuit, half-wave rectifying circuit, hysteresis comparator circuit and five miniature circuit compositions of clamp circuit; simple in structure; can in the situation that there is no controller participation protective, realize the overcurrent protection to igbt; cost is lower, is convenient in industrial extensive use.The igbt current foldback circuit overcurrent protection function that the utility model embodiment provides is comprehensive; because current sensor is placed on the emitter of igbt; can protect various overcurrents and the short-circuit conditions of igbt, comprise the abnormal conditions such as inverting output terminal shorted to earth, the short circuit of igbt bridge arm direct pass, igbt overcurrent are protected.The igbt current foldback circuit that the utility model embodiment provides, simple in structure, be easy to expansion, for having, the three-phase bridge of three brachium pontis is applicable equally.
It should be noted last that, above embodiment is only unrestricted in order to the technical solution of the utility model to be described, although the utility model is had been described in detail with reference to example, 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 departing from the spirit and scope of technical solutions of the utility model, it all should be encompassed in the middle of claim scope of the present utility model.
Claims (6)
1. an igbt current foldback circuit, comprises the first igbt element Q1 and the second igbt Q2; It is characterized in that, also comprise: Current Mutual Inductance circuit, amplifying circuit, half-wave rectifying circuit, hysteresis comparator circuit and clamp circuit;
Described Current Mutual Inductance circuit is connected with described the first igbt Q1 and the second igbt Q2, for from described the first igbt Q1 and the second igbt Q2 induction pressure drop and obtain the output current of described the first igbt Q1 and the second igbt Q2;
Described amplifying circuit is connected with described Current Mutual Inductance circuit, and described output current is delivered to described amplifying circuit, and described output current is carried out to convergent-divergent processing by linear relationship;
Described half-wave rectifying circuit is connected with described amplifying circuit, for the voltage signal of described amplifying circuit is carried out to halfwave rectifier;
Described hysteresis comparator circuit is connected with described half-wave rectifying circuit, relatively sluggish for the unidirectional voltage of described half-wave rectifying circuit output being carried out to double threshold;
Described clamp circuit is connected with described hysteresis comparator circuit and described the first igbt Q1 and the second igbt Q2 respectively, for and control the unlatching of described the first igbt Q1 and the second igbt Q2 or close.
2. igbt current foldback circuit according to claim 1, is characterized in that, described Current Mutual Inductance circuit comprises: the first Current Transmit 1, the second Current Transmit 2, the first resistance R 1, the second resistance R 2;
Described the first Current Transmit 1 is placed on the emitter place of described the first igbt Q1, and the two ends of described the first Current Transmit 1 are connected with described amplifying circuit respectively; Described the first resistance R 1 is connected in parallel on the two ends of described the first Current Transmit 1;
Described the second Current Transmit 2 is placed on the emitter place of described the second igbt Q2, and the two ends of described the second Current Transmit 2 are connected with described amplifying circuit respectively; Described the second resistance R 2 is connected in parallel on the two ends of described the second Current Transmit 2.
3. igbt current foldback circuit according to claim 2, it is characterized in that, described amplifying circuit comprises: the first operational amplifier A 1, the second operational amplifier A 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7, the 8th resistance R 8, the 9th resistance R 9, the tenth resistance R 10, the first capacitor C 1, the second capacitor C 2, the 3rd capacitor C 3 and the 4th capacitor C 4;
Described the 3rd resistance R 3 is connected in parallel with described the first capacitor C 1, and the two ends of described the 3rd resistance R 3 and described the first capacitor C 1 are connected with reverse input end and the output of described the first operational amplifier A 1 respectively; One end of described the second Current Transmit 2 is connected with the reverse input end of described the first operational amplifier A 1 by described the 4th resistance R 4, and the other end of described the second Current Transmit 2 is connected with the positive input of described the first operational amplifier A 1 by described the 5th resistance R 5; The positive input of described the first operational amplifier A 1 is by described the 6th resistance R 6 ground connection; One end of described the second capacitor C 2 is connected with the positive input of described the first operational amplifier A 1, other end ground connection; The output of described the first operational amplifier A 1 is connected with described half-wave rectifying circuit;
Described the 7th resistance R 7 is connected in parallel with described the 3rd capacitor C 3, and the two ends of described the 7th resistance R 7 and described the 3rd capacitor C 3 are connected with reverse input end and the output of described the second operational amplifier A 2 respectively; One end of described the first Current Transmit 1 is connected with the reverse input end of described the second operational amplifier A 2 by described the 8th resistance R 8, and the other end of described the first Current Transmit 1 is connected with the positive input of described the second operational amplifier A 2 by described the 9th resistance R 9; The positive input of described the second operational amplifier A 2 is by described the tenth resistance R 10 ground connection; One end of described the 4th capacitor C 4 is connected with the positive input of described the second operational amplifier A 2, other end ground connection; The output of described the second operational amplifier A 2 is connected with described half-wave rectifying circuit.
4. igbt current foldback circuit according to claim 3, it is characterized in that, described half-wave rectifying circuit comprises: the 11 resistance R the 11, the 12 resistance R the 12, the 13 resistance R the 13, the 14 resistance R 14, the 3rd operational amplifier A 3, four-operational amplifier A4, the first diode D1 and the second diode D2;
The output of described the first operational amplifier A 1 is connected with the reverse input end of described the 3rd operational amplifier A 3 by described the 12 resistance R 12; The positive input ground connection of described the 3rd operational amplifier A 3; The output of described the 3rd operational amplifier A 3 is connected with described hysteresis comparator circuit by described the first diode D1; One end of described the 11 resistance R 11 is connected with the reverse input end of described the 3rd operational amplifier A 3, and the other end is connected with the output of described the first diode D1;
The output of described the second operational amplifier A 2 is connected with the reverse input end of described four-operational amplifier A4 by described the 14 resistance R 14; The positive input ground connection of described four-operational amplifier A4; The output of described four-operational amplifier A4 is connected with described hysteresis comparator circuit by described the second diode D2; One end of described the 13 resistance R 13 is connected with the reverse input end of described four-operational amplifier A4, and the other end is connected with the output of described the second diode D2.
5. igbt current foldback circuit according to claim 4, it is characterized in that, described hysteresis comparator circuit comprises: the 15 resistance R the 15, the 16 resistance R the 16, the 17 resistance R the 17, the 18 resistance R the 18, the 19 resistance R 19, the 5th operational amplifier A 5 and the 5th capacitor C 5;
One end of described the 15 resistance R 15 is connected with power supply, and the other end is connected with the output of described the 5th operational amplifier A 5; One end of described the 16 resistance R 16 is connected with power supply, and the other end is connected with the positive input of described the 5th operational amplifier A 5; One end of described the 17 resistance R 17 is connected with the positive input of described the 5th operational amplifier A 5, and the other end is connected with the output of described the 5th operational amplifier A 5; One end ground connection of described the 18 resistance R 18, the other end is connected with the positive input of described the 5th operational amplifier A 5; The output of described the first diode D1 and the second diode D2 is connected with the reverse input end of described the 5th operational amplifier A 5 by described the 19 resistance R 19 respectively; One end of described the 5th capacitor C 5 is connected with the reverse input end of described the 5th operational amplifier A 5, other end ground connection; The output of described the 5th operational amplifier A 5 is connected with described clamp circuit.
6. igbt current foldback circuit according to claim 5, it is characterized in that, described clamp circuit comprises: PWM1 port, PWM2 port, the 20 resistance R the 20, the 21 resistance R the 21, the 22 resistance R the 22, the 23 resistance R 23, the 3rd diode D3 and the 4th diode D4;
Described PWM1 port is connected with the input of described the 3rd diode D3 by described the 21 resistance R 21; The input of described the 3rd diode D3 is by described the 20 resistance R 20 ground connection; The input of described the 3rd diode D3 is connected with described the first igbt Q1; Described PWM2 port is connected with the input of described the 4th diode D4 by described the 22 resistance R 22; The input of described the 4th diode D4 is by described the 23 resistance R 23 ground connection; The input of described the 4th diode D4 is connected with described the second igbt Q2; The output of described the 3rd diode D3 is connected with the output of described the 4th diode D4; The output of the output of described the 3rd diode D3 and described the 4th diode D4 is all connected with the output of described the 5th operational amplifier A 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320865468.8U CN203660518U (en) | 2013-12-25 | 2013-12-25 | Insulated gate bipolar transistor overcurrent protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320865468.8U CN203660518U (en) | 2013-12-25 | 2013-12-25 | Insulated gate bipolar transistor overcurrent protection circuit |
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| Publication Number | Publication Date |
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| CN203660518U true CN203660518U (en) | 2014-06-18 |
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|---|---|---|---|
| CN201320865468.8U Expired - Lifetime CN203660518U (en) | 2013-12-25 | 2013-12-25 | Insulated gate bipolar transistor overcurrent protection circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106771947A (en) * | 2016-11-25 | 2017-05-31 | 全球能源互联网研究院 | A kind of detection circuit and its detection method for IGBT surge currents |
| CN109347059A (en) * | 2018-11-05 | 2019-02-15 | 武汉精能电子技术有限公司 | A kind of hardware over-current protection method and system for bidirectional current output |
-
2013
- 2013-12-25 CN CN201320865468.8U patent/CN203660518U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106771947A (en) * | 2016-11-25 | 2017-05-31 | 全球能源互联网研究院 | A kind of detection circuit and its detection method for IGBT surge currents |
| CN106771947B (en) * | 2016-11-25 | 2020-10-13 | 全球能源互联网研究院有限公司 | Detection circuit and detection method for IGBT surge current |
| CN109347059A (en) * | 2018-11-05 | 2019-02-15 | 武汉精能电子技术有限公司 | A kind of hardware over-current protection method and system for bidirectional current output |
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