摘要
针对传统电动汽车充电机低功率密度、低充电效率和输入电流谐波含量高等问题,采用了一种新的拓扑结构。前级采用两级交错并联Boost PFC电路,能有效提高前级变换器功率密度,降低输入电流的THD值;后级采用半桥LLC谐振电路,以提高后级变换器的功率密度以及充电效率。详细分析了两级交错并联Boost PFC和半桥LLC谐振变换器的工作原理,采用基波分析方法(First Harmonic Approximation,FHA)对LLC谐振网络进行了建模,并在此基础上确定了开关频率的范围及最优工作区间,仿真并实验验证了其数学模型和参数设计的正确性。最后,设计了一台输入电压范围为175 V^265 V,最大输出功率为1.5 k W的充电机,实验结果表明其前级变换器功率因数达到0.996,输入电流THD为4%,整机效率可达94%。
Aiming at the low power density,low charging efficiency and input current harmonic content of traditional electric vehicle charging machine,a new topology structure is adopted in this paper.The former stage adopts two-stage staggered parallel Boost PFC circuit,which can effectively improve the power density of the former converter and reduce the THD value of the input current.The rear stage adopts the semi-bridge LLC resonant circuit to improve the power density and charging efficiency of the rear converter.The working principles of the two-level staggered parallel Boost PFC and the half-bridge LLC resonant converter are analyzed.The fundamental wave analysis method(First Harmonic Approximation,FHA)is used to do LLC resonant network modeling,and on this basis it determines the scope of switching frequency and the optimum working range.The simulation and experiment validate the correctness of the mathematical model and parameter design.Finally,a charger is designed whose input voltage is 175 V^265 V,and maximum output power is 1.5 kW.The experimental results show that the front-end converter power factor is 0.996,the input current THD is 4%,and the machine efficiency can reach 94%.
作者
林玉婷
曹太强
陈雨枫
Lin Yuting;Cao Taiqiang;Chen Yufeng(School of Electrical Engineering and Electronic Information,Xihua University,Chengdu 610039,China)
出处
《电子技术应用》
2018年第9期162-166,共5页
Application of Electronic Technique
基金
四川省高校重点实验室(2013TYNZ-02/TYN2015-09)
四川省电力电子节能技术与装备重点实验室(szjj2015-066)
省部级学科平台开放课题基金(szjj2017-015)
