Design of Bidirectional DC-DC LC/LC/LCC Converter to Minimize Peak Tank Current and Peak Voltage Across Tank Circuit

Integration of DC sources and DC loads requires bidirectional DC-DC power electronic converters because of their ability to facilitate two-way power transfer between various voltage levels. Bidirectional DC-DC converters are essential components of contemporary power systems. This paper presents a generalized design of a bidirectional DC-DC resonant converter for buck operation in forward conduction and boost operation in reverse conduction. LC tank circuit is used for forward conduction and the same LC tank and LCC tank circuits are considered for reverse conduction operation. Minimizing the peak tank current and voltages of the tank circuit along with a lower reactive-to-active power ratio and achieving soft switching of all devices for the entire loading range are the design objectives of this paper. The analytical and simulation results are verified with a 200W experimental prototype verifying the design. The maximum experimental efficiency above 96% is observed for LC forward buck conduction, LC reverse boost conduction and LCC reverse boost conduction operations.