摘要
为解决磁耦合谐振式无线电能传输系统由于失谐导致的输出功率大幅下降的问题,通过对串并式系统等效电路的分析,总结了系统失谐的原因,提出了一种以电压换向点处发射端的电流采样平均值作为调节依据的频率跟踪策略,使系统在发射端形成控制闭环对谐振频率进行跟踪,实现电流电压接近同相位,从而提高系统的功率因数,增大传输功率。将该策略用于实际搭建的串并式无线电能传输系统,实验结果表明,输出功率对于频率变化十分敏感,频率跟踪策略使得输出功率上升了近一倍,这也与仿真结果契合,说明该频率跟踪策略对于无线电能传输系统有实际应用价值。
In order to solve the problem that the output power of magnetic coupling resonant wireless power transfer system drops fast due to detuning,after the analysis of the series-parallel system’s equivalent circuit,the reasons why the system detune were found out,then a frequency tracking strategy based on the average value of sampling current when the voltage at commutation point was present,so that the system formed a closed loop at the transmitting terminal to implement frequency tracking,which brought the current and the voltage in phase,it improved the power factor of system and at the same time increased the transmission power.Then this strategy was used on an established series-parallel wireless power transfer system,the results show that when the frequency changes,the output power changes quickly.This strategy makes the output power of system up to almost twice as before,which fits with the simulation result.In general,this frequency tracking strategy is useable for wireless power transfer system.
作者
高磊琦
游林儒
文小琴
孟凡琨
GAO Lei-qi;YOU Lin-ru;WEN Xiao-qin;MENG Fan-kun(School of Automation Science and Engineering,South China University of Technology,Guangzhou 510640,China)
出处
《科学技术与工程》
北大核心
2019年第8期120-126,共7页
Science Technology and Engineering
基金
国家自然科学基金(61271210
61603105)
广州市科技计划(201707010054)资助
关键词
无线电能传输
磁耦合谐振
频率跟踪
输出功率
wireless power transfer
magnetic coupling resonant
frequency tracking
output power
