High efficiency parallel-parallel LLC resonant converter for HV/LV power conversion in electric/hybrid vehicles

摘要

The design of a hybrid/electric automobile oriented 2.5kW, 250kHz, HV/LV double phase parallel-parallel connected LLC resonant converter is presented. This paper proposed the concept of double phase LLC with its double loop control strategy to share the power equally between the two power cells and to maintain a high efficiency among a wide output power range. Design considerations, including the MOSFETs power module, magnetic components integration and air-cooling system are presented in detail. The final developed prototype, which can almost be directly industrialized, is targeted for future utilization in electric vehicles/hybrid vehicles. The total prototype performs 3kg, 2.5L, and a high power density 1W/cm(exp 3). Experimental results prove that a peak efficiency of 95% is obtained and efficiency is above 94% from 500W to 2kW.