Soft-switched PWM converter with inductive dc filter

This paper presents a soft-switched AC/DC power converter structure, useful for current-fed inverters and forced-commutated PWM rectifiers with inductive loads. Typical applications are high-power AC motor drives, magnet power supplies and active power filters with inductive energy storage. As compared to hard-switched power converters, the proposed solution calls for some increase of the circuit complexity, but provides improved input and output performances due to the higher switching frequency. Further improvements are ensured by proper control of the commutation process. Actual power converter capabilities are demonstrated by experimental results