Novel zero-current-switching (ZCS) PWM converters

A new family of zero-current-switching (ZCS) pulse-width-modulated (PWM) converters which uses a new ZCS PWM switch cell is presented in this paper. The main switch and auxiliary switch operate at zero-current-switching turn on and turn off, and the all passive semiconductor devices in the ZCS–PWM converter operate at zero-voltage-switching (ZVS) turn-on and turn-off. Besides operating at constant frequency and with reduced commutation losses, the proposed ZCS– PWM switch cell uses only one resonant inductor and these new converters have no additional current stress in comparison to the hard switching converter counterpart. The new family of ZCS– PWM converters is suitable for high-power application using insulated gate bipolar transistor (IGBTs). The principle of operation, theoretical analysis, and experimental results of the new ZCS– PWM boost converter, rated 1kW and operating at 30 kHz, are provided in this paper to verify the performance of this new family of converters.