Abstract
This paper proposes a switched capacitor based non-isolated zero voltage switching (ZVS) bi-directional dc-dc converter. By implementing a switched capacitor loop, it can provide high step up and step down gain. The converter is operated in continuous current mode (CCM) mode where all the power transistors are soft switched by means of dedicated auxiliary resonant networks. Each network consists of a low-rated power switch (with a body diode), a resonant capacitor and a resonant inductor. The resonant capacitors are further optimized for zero voltage switching (ZVS) turn off of the power switches. The ZVS turn on and turn off conditions are achieved for all power switches in the boost and buck mode of operations. In addition, the voltage and current stresses on the power switches are significantly reduced, thus enhancing the converter operation at high power applications.
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