电动车LLC谐振充电电源系统  

Power Supply System for LLC Resonant Charging of Electric Vehicles

作　　者：吴开源[1] 王佳佳[1] 尹彤[1] 章涛[1] 

机构地区：[1]华南理工大学机械与汽车工程学院,广东广州510640

出　　处：《华南理工大学学报（自然科学版）》2017年第4期51-58,共8页Journal of South China University of Technology(Natural Science Edition)

基　　金：广东省科技计划项目(2013B010402002)~~

摘　　要：研制了一种电动车LLC谐振充电电源系统.该系统以STM32为控制核心,采用数字化脉冲频率调制(PFM)控制,选取满足电动车铅酸蓄电池充电电源要求的LLC谐振主电路拓扑和4阶段+正负脉冲充电方案.试验结果表明:该电源系统能够全程实现LLC谐振主电路的软开关状态,LLC谐振主电路始终工作于原边MOSFET功率开关管零电压开通和副边整流二极管零电流关断软开关状态,提高了电源转换效率;结合电池充电曲线并使用4阶段+正负脉冲充电方式,可以减少过充电及析气极化现象,保护电池,提高充电速度.Proposed in this paper is a STM32-based LLC resonant charging power supply system for electric vehi-cles, which employs digital PFM （Pulse Frequency Modulation） for the system control and adopts an LLC resonant topology as well as a four stages ＋ positive and negative pulse charging scheme that meets the charging requirements of lead-acid battery. Test results demonstrate that （ 1 ） the proposed power supply system helps to implement the whole-course soft switching state of the main circuit of LLC resonant converters; （2） the main circuit of LLC reso-nant converters always operates in the primary-side MOSFET ZVS and the secondary-side rectifier diode ZCS soft-switching state, which improves the power conversion efficiency; and （3 ） the combination of battery charging curves and four stages ＋ positive and negative pulse charging scheme can reduce the overcharging as well as gassing polarization, protect the battery and increase the charging speed.

关 键 词：电动车 充电电源 铅酸蓄电池 正负脉冲充电 LLC谐振 STM32芯片 

分 类 号：TM46[电气工程—电器]