摘要
采用SS补偿结构的磁耦合谐振式无线电能传输(MCR-WPT)系统工作在过耦合区域时的频率分裂现象会导致基于逆变器输出电压和初级电流的频率跟踪方法无法始终跟踪固有谐振频率,从而降低系统的传输效率。在此分析了系统工作在过耦合和欠耦合情况下逆变器输出电压和次级电流的相位关系,设计了采用锁相环(PLL),基于逆变器输出电压和次级电流的频率跟踪实验方案。实验结果表明采用基于逆变器输出电压和次级电流的频率跟踪方法可以在任何互感和负载条件下始终跟踪系统的固有谐振频率而不受频率分裂现象的影响,从而提高系统的传输效率。
The frequency splitting phenomenon of SS compensation structure magnetic coupling resonant wireless power transfer(MCR-WPT)system in the over-coupled region will lead to the methods which based on the output voltage of the inverter and the secondary side current can not always track the natural resonant frequency,thus reducing the transmission efficiency of the system.The phase relationship between the output voltage of the inverter and the secondary side current is analyzed,and a frequency tracking experimental scheme which'uses the phase-locked loop(PLL), based on the output voltage of the inverter and the secondary side current is designed.Experimental results show that the frequency tracking method which based on the output voltage of the inverter and the secondary side current can always track the natural resonant frequency under any mutual inductance and load conditions and will not be affected by the frequency splitting phenomenon,so as to improve the transmission efficiency of the system.
作者
刘尚江
沈艳霞
LIU Shang-jiang;SHEN Yan-xia(Engineering Research Center of Application of IOT of Ministry of Education,Jiangnan University,Wuxi 214122,China)
出处
《电力电子技术》
CSCD
北大核心
2019年第2期47-50,共4页
Power Electronics
基金
国家自然科学基金(61573167)
中央高校基本科研业务费专项资金(JUSRP51510)~~
关键词
无线电能传输
磁耦合谐振
频率跟踪
频率分裂
wireless power transfer
magnetic coupling resonant
frequency tracking
frequency splitting
