Switch module, converter and electrical energy conversion device

Abstract

The invention relates to a switch module, a converter and an electrical energy conversion device. The switch module comprises at least two electronic switches and at least two overvoltage protection circuits, wherein the electronic switches are serially connected to one another; the overvoltage protection circuits are electrically coupled to the electronic switches respectively; each overvoltage protection circuit comprises a clamping unit and a protecting unit; each clamping unit is used for providing a clamping voltage to the corresponding electronic switch when voltages at two ends of the corresponding electronic switch are greater than a first preset voltage; and each protecting unit is used for switching on the corresponding electronic switch when the voltages at two ends of the corresponding electronic switch are greater than a second preset voltage. Each electronic switch can be subjected to double overvoltage protection by the corresponding clamping unit and the corresponding protecting unit, and the reliability is improved. The invention also provides a converter comprising the switch module and an electrical energy conversion device comprising the switch module.

Description

technical field [0001] The embodiments disclosed in the present invention relate to a switch module, a converter and a power conversion device, and in particular to a switch module, a converter and a power conversion device with a new overvoltage protection circuit. Background technique [0002] A converter is generally used as an energy conversion device to convert one form of energy into another form of energy. For example, a multi-level inverter as a type of converter usually includes several phase circuits (corresponding to multi-phase AC output), each phase circuit includes two switching units, and the switches in the above-mentioned phase circuits are controlled by an appropriate control system The unit can be turned on or off to realize the function of converting DC power to AC power. [0003] For some AC motors with high voltage requirements, such as high voltage water pumps, high voltage compressors and other equipment, each switching unit on the applied inverter w...

AI Technical Summary

Problems solved by technology

[0007] Obviously, because the impedance of the turned-on transistor Q15 is very low, most of the current Iz of the Zener diode Z10 is bypassed by the transistor Q15, so that the current Iz1 flowing into the gate of the IGBT92 is greatly reduced; resulting in a greatly reduced clamping effect reduces, or reduces the effectiveness of the active clamp circuit 90

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