A high-frequency link parallel resonant Dc/DC power converter is analyzed for fixed-frequency operation using the constant current model and the state-space approach. The fixed-frequency (FF) parallel resonant converter (PRC) is seen to enter different operating modes depending on the output load level. It is shown that, though the converter enters leading power factor operation for less than 50% load condition, the switch current is still force commutated, which preserves the advantages of lagging power factor operation. A general solution which describes all the possible modes of FF PRC operation under steady-state conditions is obtained. A method of obtaining the optimum operating point under certain constraints is developed and is used to present a simple design procedure. Experimental results showing the different modes of FF PRC operation obtained with a MOSFET-based converter are given to verify the theory.
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