PWM Controlled Single Stage Resonant Converter With Multiwinding Coupled Inductor

A fixed frequency pulsewidth modulation (PWM)-controlled resonant converter with multiwinding coupled inductor is proposed in this article. The single-stage power transmission and full range zero voltage switching can be achieved of the proposed converters. Moreover, the proposed converter has the load independent voltage gain characteristic and the wide range operation capability. The interleaved boost part and resonant part are integrated through only one multiwinding coupled inductor. Hence, the number of magnetic components and switches is effectively reduced. Under the coupled of interleaved PWM current and resonant current in multiwinding, the equivalent parameters model is proposed which can intuitively analyze the voltage and current characteristics. In addition, for the resonant part, multiple harmonic analysis is adopted. More accurate analysis results of voltage gain and soft switching are obtained without complex time-domain calculation. Finally, an experimental prototype with 30–60 V input voltage and 750 V output voltage was built. The experimental results proved the effectiveness and feasibility.