A ZVS-PWM Full-Bridge Series-Resonant DC/AC Converter

A ZVS-PWM full-bridge series-resonant DC/AC converter without additional auxiliary switch is proposed. The proposed circuit topology is simple because it is configured by four power switches, a resonant tank, and an output filter. The resonant tank not only generates a sinewave voltage waveform with lower high frequency harmonics but provides zero voltage switching function on all power switches. Thus, the configuration of low switch loss, low cost, and low EMI can be achieved. The simple sinusoidal pulse width modulation (SPWM) control method is used in the proposed converter to provide well system dynamic regulation. A design example of 600W DC/AC inverter is examined to assess the DC/AC converter performance and it provides high power efficiency above 96.3% under the rated power.