"A Wide-Range Output Voltage for EV WPT Systems Based on Series and Parallel LCC Circuits"

"There are two main battery voltage levels (400 V and 800 V) for electric vehicles (EVs). Conventional wireless power transfer (WPT) systems utilize different connection circuits to accommodate these voltages, which may cause additional power losses. This paper proposes a new LCC-LCC WPT system to accommodate both 400 V and 800 V battery voltages without compromising performance. The generalized mathematical model of the proposed system is presented.The current-sharing and voltage-sharing characteristics of the parallel and series connected circuits are analyzed. In addition, design considerations including power loss, power transfer capacity, and efficiency are discussed. Finally, an experimental prototype is built to verify the proposed system.The prototype can achieve 94.3% efficiency at a power level of 5 kW under 400 V and 800 V output voltages, which proves the effectiveness of the proposed method."

电动汽车（Electric Vehicle, EV）的主流电池电压等级分为两类：400V与800V。传统无线电能传输（Wireless Power Transfer, WPT）系统通常采用不同的连接电路以适配这两类电压，此举可能会带来额外的功率损耗。本文提出一种新型LCC-LCC型无线电能传输系统，可在不牺牲系统性能的前提下适配400V与800V两类电池电压。本文给出了该系统的广义数学模型，分析了并联与串联连接电路的均流与均压特性。此外，本文还讨论了功率损耗、功率传输容量与效率等方面的设计考量要点。最后，本文搭建了实验样机以验证所提系统的有效性。该样机在5kW功率等级、400V与800V输出电压工况下可实现94.3%的传输效率，充分验证了所提方法的有效性。