A method of voltage equalization in igbt series turn-on process

A clamping and control unit technology, applied in the field of voltage equalization control in the opening process
CN107517004BActive Publication Date: 2019-10-22NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Publication Date
2019-10-22

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Abstract

The invention discloses a voltage-sharing method of an IGBT (insulated gate bipolar transistor) serial connection opening process, and belongs to the technical field of power electronics conversion. The voltage-sharing control method utilizes an opening process active clamping circuit configured to every IGBT, increases a simple isolation detecting circuit and detects voltage reduction moment of an IGBT set emitter. The FPGA is used for performing information treatment on a returning signal of the detecting circuit, extracting delay time numerical value of the opening process of every IGBT, and applying these time information to adjust the rising edge of the IGBT driving signal; after adjusting for many times, the voltage sharing of every IGBT is realized. The voltage-sharing control method proposed in the invention is applicable to a part of middle and high voltage power IGBT; the method is simple and easy to practice; besides, the method has the advantages of realizing the voltage-sharing speedability of the opening process of the IGBT serial connection while guaranteeing high stability.
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Description

technical field

[0001] The invention relates to a voltage equalization control method in the turn-on process of a power device IGBT applied in multiple series connections. It belongs to the technical field of power electronic conversion. Background technique

[0002] In the field of medium and high voltage power conversion, IGBT is widely used due to its good working characteristics. However, as the working voltage increases, a single IGBT module cannot work alone, and it is often necessary to directly connect multiple IGBTs in series.

[0003] If multiple IGBTs are directly connected in series, there is a voltage equalization problem between the IGBTs, and a certain voltage equalization scheme needs to be adopted to solve this problem. The working characteristics of IGBT determine that the voltage equalization problem in the turn-off process is more severe, so the existing voltage equalization schemes focus on solving the voltage equalization problem in the turn-off proce...

Claims

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