Abstract
ABSTRACTThis paper studied a bidirectional frequency-control dc converter with magnetic-coupling to achieve 1) current balance on low voltage side, 2) low switching losses on power devices, and 3) bidirectional power transfer capability. The developed circuit is basically constructed by half-bridge circuits on input and output sides. LLC resonant tank with frequency-control is used to obtain low switching losses on power devices. Magnetic-coupling element is used to achieve current balance on low voltage side. Synchronous rectifiers are employed on low voltage and high current side to decrease power losses and increase circuit efficiency. The effectiveness of the studied circuit is verified from a 720 W laboratory prototype.
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