http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
High Efficiency Onboard Charger Based on Two-Stage Circuit
Xue Fei,Ma Xin,Li Hongqiang,Zhang Di,Xu Hengshan,Zhou Lei,Wang Chao 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.4
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 effi ciency. 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 effi ciency of ILPFC are studied by discrete iterative method, and the internal parameters are optimized to improve ILPFC`s effi ciency. Meanwhile, the relationships between the resonant parameters and effi ciency of LLC converter are also studied by fundamental harmonic approximation method to optimize the effi ciency in wide charging voltage. A 3.3 kW OBC prototype is developed to verify the eff ectiveness 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