可抗负载敏感性的大功率D/E类逆变器设计  

High Power Class D/E Inverter Design With Load Sensitivity

作　　者：袁伟 王平[1] 刘彦明 刘艳阳 YUAN Wei;WANG Ping;LIU Yan-ming;LIU Yan-yang(Xidian University,Xi'an 710126,China)

机构地区：[1]西安电子科技大学,空间科学与技术学院,陕西西西安710126 [2]上海卫星工程研究所,上海200240

出　　处：《电力电子技术》2023年第10期5-7,共3页Power Electronics

基　　金：上海航天科技创新基金(SAST2022-115);国家自然科学基会(62103313)。

摘　　要：逆变器作为无线电能传输系统的发射前端,关系到整个系统性能的优劣。但是,常见全半桥逆变器在高频下开关损耗大、控制复杂,而高频化的E类逆变拓扑又存在着对负载变化敏感等缺点。此处结合半桥与E类逆变拓扑技术,提出一种基于D/E类逆变拓扑结构以实现500 kHz下大功率无线电能传输。该拓扑结构不仅继承了半桥逆变器MOSFET电压应力低,可实现大功率逆变的优点,还具备E类逆变拓扑的高效性,并且有效降低了逆变器对阻抗的变化敏感程度。在线圈距离微变化扰动情况下,发射端逆变器可以保持在零电压开启(ZVS)状态,实现了高效率输出。实验结果验证了D/E类逆变器在高频化无线传能系统中的可靠性,实现了传输功率500 W下线圈距离变化1 cm时,其仍具有软开关特性,有效降低了逆变器对于负载的实部、虚部变化的敏感性,其输出效率大于95%。As the transmitting front-end of a wireless energy transmission system,the inverter has a bearing on the performance of the whole system.However,the common full half-bridge inverter has high switching losses and complex control at high frequencies,while the high frequency class E inverter topology has disadvantages such as sensitivity to load variations.A class D/E inverter topology based on a combination of half-bridge and class E inverter topologies is proposed to realise high power wireless energy transmission at 500 kHz.The topology not only inherits the advantages of low voltage stress on the MOSFET of the half-bridge inverter and enables high-power inverters,but also has the high efficiency of class E inverter topology and effectively reduces the sensitivity of the inverter to changes in impedance.The transmitter inverter can be kept in a zero-voltage switch(ZVS)state for high efficiency output in the case of a slight change in coil distance perturbation.The experimental results verify the reliability of the class D/E inverter in high frequency wireless energy transfer systems,achieving soft switching characteristics for a 1 cm change in coil distance at a transmission power of 500 W,effectively reducing the sensitivity of the inverter to changes in the real and imaginary parts of the load,and achieving an output efficiency of more than 95%.

关 键 词：逆变器 开关损耗 高效率 

分 类 号：TM464[电气工程—电器]