In chapter two, the main circuit and control circuit of DC part are designed, and the design of RCD snubber circuit, the parameter of LC filter, the selection of magnetic material, and the SMPS is detailedly introduced; In chapter three, the main circuit and control circuit of AC part ar

This article introduced the antijamming in the NC system design,from the shield(including electric field shield,magnetic screen and electromagnetic field shield) designs mentions,added the absorbing circuit to the perceptual load to suppress the transient state noise to give the specify,might avoid the NC system which disturbed creates softly breakdown.

The reasons of dynamic voltage unbalancing of serial IGBTs are concluded : the differences in the absorption circuit parameters, the time-delays of gate driving signal and the gate driving circuit parameters.

Simulation design of snubber circuit based on P-N junction reverse recovery;

Study of delta snubber circuit of GTO converter;

The causes are discussed from the inner structure of IGBT and the typical countermeasures are summarized,including soft-switching,snubber circuit and new switching component.