Analysis and design of a high frequency parallel resonant converter operating above resonance

A high-frequency link DC/DC converter using a parallel-resonant inverter and operating above resonance is analyzed using the state-space approach and constant-current model. Closed-form solutions are obtained under steady-state conditions. The analysis shows that most equations are of almost the same form as those corresponding to operations below resonance. The analysis presented is used to obtain design curves and to provide a simple design procedure which is illustrated by a design example. Experimental results obtained with a prototype unit, which uses MOSFETs as switches and operates above 90 kHz, are presented to support the theory