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提出采用神经网络和频谱分析实现电力电子电路在线故障诊断的方法，以三相整流电路为例，对其故障情况进行了分析，并选用ＢＰ网络进行了有效的故障诊断． 仿真和实验表明，本方法是有效的．
The method of on-line fault diagnosis of power electronic circuit based on neural network and spectrum analysis is proposed. Taking the three-phase rectifier circuit as an example, the fault conditions of the three-phase rectifier circuit are analyzed, and the BP network is selected for effective fault diagnosis. Simulation and experiment show that this method is effective.