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本文对直流斩波电路故障诊断专家系统方案设计提出了理论根据及解决实际问题的方法，知识库设计为多元故障树，诊断数据来源于对象的测试与推理，依据特征向量实现故障定位．采用功能级故障诊断模型比依据网络理论建立的数学模型更为简便．
In this paper, the theoretical basis and solution to the practical problems of DC chopper circuit fault diagnosis expert system are proposed. The knowledge base is designed as multiple fault tree. The diagnostic data comes from the object test and reasoning, and the fault location is realized based on the feature vector. The use of functional level fault diagnosis model is more simple than the mathematical model based on network theory.