A dual connected passive filter scheme for PWM converters

This paper presents a passive filter topology based in a dual connection, especially designed for application in PWM converters. The proposed passive filter topology has the advantage of simultaneously attenuating high frequency leakage currents generated by common mode voltages and reducing the amplitude of the over-voltage at motor terminals due to wave reflection. The proposed passive filter takes advantage of a dual R-C configuration and can be implemented either in PWM inverters or active front end rectifiers. It is shown that the proposed topology is of simple implementation and shows very good performance for attenuation of both common mode leakage currents and over-voltage. Simulation and experimental results demonstrate the effectiveness of the proposed dual passive filter topology.