Inverter and method for suppressing bridge arm crosstalk

Abstract

The invention relates to an inverter and a method for suppressing bridge arm crosstalk, and a computer readable storage medium. The inverter comprises a bridge type inverter circuit which comprises an upper bridge arm MOSFET and a lower bridge arm MOSFET, wherein one of the upper bridge arm MOSFET and the lower bridge arm MOSFET of each phase of bridge arm is selected to be conducted; clamping switch tubes which are arranged between the grid electrodes and the source electrodes of the bridge arm MOSFETs and are suitable for being switched on to eliminate the grid-source voltage of the corresponding bridge arm MOSFETs; and a processor which is in communication connection with the bridge arm MOSFETs and the clamping switch tubes, and is configured to monitor the on-off states of the bridge arm MOSFETs, and in response to the conduction of any bridge arm MOSFET, switch on the clamping switch tube corresponding to the other bridge arm MOSFET of the phase bridge arm to keep the other bridge arm MOSFET to be switched off. According to the invention, the Miller effect of the grid electrode of the MOSFET can be eliminated, so that the problem of bridge arm misoperation caused by bridge arm crosstalk can be solved.

Description

technical field [0001] The invention relates to a technology for suppressing bridge-arm crosstalk of an inverter, in particular to an inverter for suppressing bridge-arm crosstalk, and a method for suppressing bridge-arm crosstalk of an inverter. Background technique [0002] As a wide bandgap semiconductor device, silicon carbide (SiC) power modules have received extensive attention and research due to their outstanding advantages such as high-speed switching, high power density, high temperature resistance, and low loss. The use of SiC power modules in motor controllers can reduce the size of the controller and improve power density and efficiency. [0003] In the practical application of SiC motor controllers, in addition to meeting some basic requirements for driving silicon carbide devices, it is also necessary to solve the problem of false turn-on caused by gate Miller effect (Miller Effect) bridge arm crosstalk. Bridge arm crosstalk means that in a single-phase or th...

AI Technical Summary

Problems solved by technology

Especially the bridge circuit using SiC MOSFET is more prone to bridge arm crosstalk

[0005] In order to overcome the above-mentioned defects in the prior art, there is an urgent need in the art for a technology for suppressing bridge arm crosstalk, which is used to eliminate the gate Miller effect of MOSFETs, so as to overcome the problem of bridge arm misoperation caused by bridge arm crosstalk

Images