摘要
E类放大器是磁共振无线电能传输(wireless power transmission,WPT)系统中常用的高频电源,其开关效率是评价WPT系统整体性能的关键指标。针对E类放大器中开关器件的效率和电压应力与负载的紧耦合关系导致其输出效率的不稳定,根据锂离子电池的充电特性和E类放大器的输出效率特性,选用合理的谐振补偿网络结构,提出了一种通过电容和电感阵列实现E类放大器零电压开关状态的主动控制策略。结果表明:在20 cm气隙条件下实现了功率输出为1.1 k W、逆变部分效率高于95%以上的WPT系统实验,大大提高了采用E类放大器的WPT系统的稳定性,验证了所提出控制策略的有效性。
Class E amplifiers is a commonly used high-frequency power supply in wireless power transmission(WPT)system,and their switching efficiency is a key indicator for evaluating the overall performance of the WPT system.The output efficiency of class E amplifier is unstable due to the close coupling relationship between the efficiency,voltage stress of switching devices and the system load.The output efficiency of class E amplifier and the charging characteristics of Lithium-ion battery were considered together,an active control strategy was proposed to realize zero voltage switching of class E amplifier through adding an capacitor and inductor array to the compensation network of WPT system.The results show that WPT system with power output of 1.1 k W and inverter efficiency of more than 95%is realized in 20 cm air gap,and the effectiveness of the proposed control strategy with class E amplifiers is verified.
作者
梁瑜
LIANG Yu(CRRC Academy,Beijing 100070,China)
出处
《科学技术与工程》
北大核心
2021年第13期5369-5373,共5页
Science Technology and Engineering
基金
国家自然科学基金(51807188)。
关键词
E类放大器
无线电能传输
开关阵列
主动控制策略
class E amplifier
wireless power transmission
switch arrays
active control strategy
