Abstract
The ground current equivalent circuit of the series chopper circuit is proposed. The ground current of the following two switching modes is analysed: The IGBT of the upper chopper circuit is turned on when the IGBT of the lower chopper circuit is in the off state; The IGBT of the upper chopper circuit is turned off when the IGBT of the lower chopper circuit is in the off state. The ground current paths of the two switching modes are analyzed, and the mechanism of ground current crosstalk between the upper and lower chopper circuits in the series chopper circuit is obtained. The analysis is verified by simulation and experimentation.
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