Comprehensive topological analyses of isolated resonant converters in PEV battery charging applications

In this paper, four basic resonant dc/dc topologies (SRC, PRC, LCC, and LLC) are investigated for plug-in electric vehicle (PEV) charging applications. A methodology based on first harmonic approximation is introduced to effectively evaluate the circuit performance in battery charging applications. The charging profile of a 360 V, 3.2 kW Li-ion battery pack is introduced to facilitate the design of resonant chargers. Four half-bridge isolated resonant chargers are designed and compared using this proposed method. Simulations show that LLC resonant converter outperforms the other three converters by maintaining good performance over the full range of battery states of charge.