Abstract
This paper proposes an isolated bidirectional DC-DC converter that is suitable for use in a low-voltage, large -current battery integrated photovoltaic(PV) system. The proposed converter comprises an asymmetrical half-bridge and current-driven rectification circuit with a center-tap transformer. The voltage stress of switching devices is suppressed by zero-voltage switching (ZVS) of the half-bridge circuit on the primary side, and synchronous rectification on the secondary side reduces conduction losses. In addition, the proposed circuit is capable of current boost operation by using synchronous rectifier on the secondary side. Voltage clamp circuits suppress the stray resonance and voltage surge during the battery charge and discharge mode. ZVS operation of all switching devices and the effectiveness of the voltage clamp circuits are confirmed through PSpice simulation.
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