科研之友
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摘要
On-board charger (OBC) is key part of electric vehicles. Limited to space and weight, design objectives of OBC are high power-density and high efficiency. Two-stage circuit is commonly used for 3.3 kW OBC, interleaved power factor correction (ILPFC) is utilized for power factor correction and DC bus voltage regulation, LLC resonant converter is utilized for voltage and power regulations. In this paper, the relationships between the internal parameters and efficiency of ILPFC are studied by discrete iterative method, and the internal parameters are optimized to improve ILPFC`s efficiency. Meanwhile, the relationships between the resonant parameters and efficiency of LLC converter are also studied by fundamental harmonic approximation method to optimize the efficiency in wide charging voltage. A 3.3 kW OBC prototype is developed to verify the effectiveness and correctness of the optimal method, the power factor and total harmonic distortion at full-load state are about 99.99% and 2.98% with the charging voltage ranging from 230 to 430 V, respectively.
