电源线路滤波器中的漏电流

Leakage Current in Power Supply Circuit Filter

出于安全考虑,在使用无源EMI滤波器时,需要考虑漏电流的影响。大多数制造商定义了正常运行时每个相的漏电流。一般来说,漏电流的额定值不是测量的结果,而是计算值。本文论述了关于漏电流的基本内容,包括标准对漏电流的要求,三相供电网和单相供电网的漏电流计算和测量方法,供电网拓扑对漏电流影响等。

With consideration of safety, the influence of leakage current must be considered when passive EMI filter is used. Most of manufactures defined the leakage current in each phase when regular running. Generally speaking, the rating of leakage current is not the measure result but the calculating value. The article discusses the basic content of leakage current including the criterion requirements of leakage current, the calculating and measure method of leakage current in 3-phase and single phase power supply net as well as the influence of power supply net topology on leakage current.