On-line monitoring device of leakage current of power electronic converter switching tube and method thereof

The invention discloses an on-line monitoring device of leakage current of a power electronic converter switching tube and a method thereof; the device comprises a Buck transformer main circuit, an assistant switching tube and a peak value detecting circuit. In working, a control signal of the assistant switching tube is given according to a control signal of a main power switching tube of the Buck circuit; and then the voltage peak value in disconnecting period of both ends of the assistant switching tube is detected; at last, the leakage current of the main power switching tube of the Buck circuit is calculated according to the voltage peak value and the disconnecting time thereof during the disconnecting period of both ends of the assistant switching tube. The device and the method can realize the online monitoring of the leakage current of the switching tube in the power electronic converter, and provides a basis for forecasting the service life of the switching tube. 本发明公开了种电力电子变换器开关管漏电流在线监测装置及方法，该装置包括Bu