A Novel ZVS-PWM Single-Stage Single-Phase AC/DC/AC Converter with High Power Factor

This paper proposes novel zero-voltage-switching pulse-width modulation (ZVS-PWM) single-stage single-phase ac/dc/ac converter to give high power factor and low current distortion on the rectifier side and provide clean and stable ac voltage on the inverter side. In the proposed converter, besides operating at constant frequency, all semiconductor devices operate at soft-switching without additional voltage stress and current stress. An average-current-mode control is employed in the rectifier side of proposed converter to detect the transition time and synthesize a suitable low harmonics sinusoidal waveform for the input current. The sinusoidal pulse-width modulation (SPWM) control strategy is employed in the inverter of proposed converter to achieve well dynamic regulation. A design example of 1000W ZVS-PWM single-stage single-phase ac/dc/ac converter is examined to assess the converter performance.