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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
Received:15 June 2021,
Revised:2021-11-01,
Published Online:18 February 2022,
Published:10 April 2022
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YAO Ruoyu,QU Xiaohui,YU Jidong,et al.Three-coil Wireless Battery Charger with Self-adaptation to Battery Charging Curve[J].Automation of Electric Power Systems,2022,46(7):170-177.
姚若玉,曲小慧,郁继栋等.自适应电池充电曲线的三线圈电池无线充电器[J].电力系统自动化,2022,46(7):170-177. DOI: 10.7500/AEPS20210615005.
YAO Ruoyu,QU Xiaohui,YU Jidong,et al.Three-coil Wireless Battery Charger with Self-adaptation to Battery Charging Curve[J].Automation of Electric Power Systems,2022,46(7):170-177. DOI: 10.7500/AEPS20210615005.
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.
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