自适应电池充电曲线的三线圈电池无线充电器  

Three-coil Wireless Battery Charger with Self-adaptation to Battery Charging Curve

作　　者：姚若玉 曲小慧[1,2] 郁继栋 王国雨 陈武 YAO Ruoyu;QU Xiaohui;YU Jidong;WANG Guoyu;CHEN Wu(School of Electrical Engineering,Southeast University,Nanjing 210096,China;Jiangsu Provincial Key Laboratory of Smart Grid Technology and Equipment,Nanjing 210096,China)

机构地区：[1]东南大学电气工程学院,江苏省南京市210096 [2]江苏省智能电网技术与装备重点实验室,江苏省南京市210096

出　　处：《电力系统自动化》2022年第7期170-177,共8页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(52077038);江苏省自然科学基金资助项目(BK20181280);中央高校基本科研业务费专项资金资助项目(2242020k1G007)。

摘　　要：目前的无线供电应用中多采用锂电池作为负载,无线充电器应提供电池所需的先恒流后恒压输出,其中恒流与恒压的切换多依赖后级变换器、复合拓扑或高阶网络来实现,控制复杂,可靠性差。为解决该问题,文中提出了一种可自适应电池充电曲线的三线圈电池无线充电系统,该系统通过在原边侧增加辅助线圈和无源整流桥,实现恒流与恒压模式的自动切换,不需要额外控制;辅助线圈通过特定补偿网络与输入源并联,输出阈值不受磁路耦合机构参数限制,自适应于任意电池充电曲线。该三线圈电池无线充电器在2种充电模式下均工作在同一频率,保证逆变器软开关与变换器近似零无功环流,降低了器件应力,提高了传输效率,且该电路具有自动开路保护功能。文中系统阐述了该充电器的拓扑结构设计原则和工作原理,并搭建了一台输出为72 V/2.5 A的实验样机,验证了所提充电器的有效性。Lithium-ion batteries are commonly used as loads in current wireless power supply applications.The wireless battery charger should provide an initial constant current(CC)and a subsequent constant voltage(CV)output required by the battery.The additional converter at the secondary side,the hybrid topology,or the high-order network can realize CC-to-CV transition,which have the problems of complicated control and poor reliability.To solve this problem,this paper proposes a three-coil wireless battery charging system with self-adaptation to the battery charging curve.By adding an auxiliary coil and a passive rectifier bridge at the primary side,the system can automatically realize CC-to-CV transition without any additional control.The auxiliary coil is connected in parallel with the input source through a specific compensation network,and the output voltage threshold is not limited by the magnetic coupling mechanism parameter.Thus the self-adaptation to the battery charging curve is realized.Meanwhile,the proposed three-coil wireless battery charger operates at the same frequency in both charging modes,which ensures the soft switching of the inverter and the near-zero reactive power circulation of the converter,to reduce the device stress and improve the transmission efficiency.Moreover,the proposed charger has the function of automatic open-circuit protection.In this paper,the design principles and operation principle of the charger are systematically described,and an experimental prototype with 72 V/2.5 A output is built to verify the effectiveness of the proposed charger.

关 键 词：无线电能传输 电池无线充电器 恒流-恒压切换 辅助线圈 自动开路保护 

分 类 号：TM910.6[电气工程—电力电子与电力传动]