Abstract
Recently, the high-frequency leakage currents by voltage-source PWM inverter of an elevator cause EMI (electro magnet interference) to other equipment. Although an insulated transformer is effective, it is required an improvement environmentally because of large-sized and a heavy load. This paper proposes a new passive filter for reducing the leakage currents and reports other effects to the external equipment. This new passive filter has a bypass circuit between input and output of an inverter, extracts only the high-frequency leakage currents and performs returning to an inverter. It has attained 1/15 or less weight saving and the large miniaturization to an insulated transformer.
