Drive circuit applicable to multi-parallel IGBTs

A driving circuit and parallel technology, applied in the direction of electrical components, output power conversion devices, etc., can solve the problems of parallel IGBT auxiliary emitter circulating current, etc., and achieve the effect of eliminating circulating current, consistent current, and improving utilization.

Active Publication Date: 2016-10-26
HANGZHOU FIRSTACK TECH
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a drive circuit suitable for multi-parallel connection of IGBTs. The auxiliary E terminal voltage of each IGBT is sampled by the sampling unit, and then the voltage compensation is performed in time by the compensation unit, which solves the problem of parallel IGBT auxiliary emitters. There is a serious circulation problem between

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  • Drive circuit applicable to multi-parallel IGBTs

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[0014] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0015] see figure 1 , shows a drive circuit suitable for multi-parallel connection of IGBTs according to an embodiment of the present invention, including a digital control core 101, a voltage sampling unit 102 corresponding to the number of IGBT channels, and a compensation unit 103 corresponding to the number of IGBT channels. The sampling unit 102 is connected to the auxiliary E terminal of one IGBT, and is used to sample the voltage of the aux...

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Abstract

The invention discloses a drive circuit applicable to multi-parallel IGBTs. The drive circuit comprises a digital control core, voltage sampling unit of which the quantity is corresponding to the quantity of IGBTs, and compensation units of which the quantity is corresponding to the quantity of IGBTs, wherein each voltage sampling unit is connected with an auxiliary E end of one IGBT, used for sampling a voltage of the auxiliary E end to earth, and inputting the collected voltage into the digital control core; the digital control core compares the sampled voltages of which the quantity is the same as the quantity of the IGBTs, performs a comparison operation, and inputs an operation result into the compensation unit, and thus the voltages of the auxiliary E ends of the IGBTs are accordant. According to the circuit, the voltage of the auxiliary E end of each IGBT is sampled by the sampling unit, and voltage compensation is timely implemented via the compensation unit, the problem that a serious circular current exists among the auxiliary emitters of the parallel IGBTs is solved.

Description

technical field [0001] The invention belongs to the technical field of IGBT driving, and in particular relates to a driving circuit suitable for multi-parallel connection of IGBTs. Background technique [0002] In the existing multi-channel IGBT parallel circuit, there is a serious circulation between the auxiliary emitters of parallel semiconductors, which makes the semiconductors have a risk of failure. At the same time, there is a serious circulation between the auxiliary emitters of the parallel modules, which makes the gate voltage of each parallel semiconductor appear. The difference makes the current of the parallel modules inconsistent and affects the utilization of semiconductors. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a driving circuit suitable for multi-parallel connection of IGBTs. The auxiliary E terminal voltage of each IGBT is sampled by the sampling unit, and then the voltage compensation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/088
CPCH02M1/088
Inventor 施贻蒙李军王文广徐晓彬
Owner HANGZHOU FIRSTACK TECH
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