Self-adaptive voltage-sharing circuit for series connection of insulated gate bipolar transistors (IGBTs) and electronic power equipment

Abstract

The invention provides a self-adaptive voltage-sharing circuit for series connection of insulated gate bipolar transistors (IGBTs) and electronic power equipment. The self-adaptive voltage-sharing circuit comprises a reference voltage waveform automatic generation circuit and a plurality of IGBT driving current regulation circuits, wherein the reference voltage waveform automatic generation circuit is connected with each IGBT driving current regulation circuit respectively through a high-speed communication interface, each IGBT driving current regulation circuit is connected with each IGBT gate driving circuit, the reference voltage waveform automatic generation circuit is used for calculating reference voltages of collectors and emitters, and each IGBT driving current regulation circuit is used for comparing voltages of each collector and each emitter with the reference voltages of each collector and each emitter and adjusting an output current of each gate driving circuit according to a comparison result so that the voltages of each collector and each emitter are equal to the reference voltages of each collector and each emitter. Compared with the prior art, the self-adaptive voltage-sharing circuit for series connection of IGBTs and the electronic power equipment, provided by the invention, have the advantages that the reference voltages of each collector and each emitter are not needed to be set in advance, the self-adaptive voltage-sharing circuit has relatively high universality, so that the self-adaptive voltage-sharing circuit can be applicable to various types of electronic power equipment.

Description

technical field [0001] The invention relates to the technical field of power electronic device control, in particular to an adaptive voltage equalizing circuit for IGBT series connection and power electronic equipment. Background technique [0002] Insulated gate bipolar transistor (IGBT (Insulated Gate Bipolar Transistor, IGBT) has become the best choice for high-power electric energy conversion applications because of its high rated voltage and rated current, fast switching speed, and easy driving. , has been widely used. But at present, the voltage and current capacity of a single IGBT tube are still very limited. Electric energy conversion occasions cannot meet the demand. Using multiple IGBTs in series can effectively solve the defect of a single IGBT’s low withstand voltage level, and the cost is low, which has attracted widespread attention. ABB has built multiple flexible IGBTs in direct series DC transmission lines have been successfully operated for many years, sh...

AI Technical Summary

Problems solved by technology

However, the reference voltage waveform of the conventional adaptive voltage equalization circuit is not easy to set accurately, and the reference voltage waveforms corresponding to different types of IGBTs with different powers are different, which makes the versatility of the active voltage control method worse.

Images