输入端多重并联的单管无线充电实验平台设计

Design of Experimental Platform for Single-switch Wireless Charging System with Multiple Parallel Inputs

针对现有无线电能传输系统中基于单管逆变电路的WPT系统无法直接如桥式电路进行多重并联的问题,设计了一种基于单管LC逆变电路的输入端多重并联无线充电实验装置以提升其输出功率。实验装置采用均流线圈且更换接线方式进行均流,提高单管逆变WPT电路的可靠性;通过电路等效,理论上验证了多重并联可行性且电路输出电压为与负载无关的恒压源;应用Saber仿真软件搭建仿真平台验证了理论分析正确性。同时搭建输出功率为1.8 kW的输入端三重并联实验室样机进行了实验,样机最大效率可达90.8%并在全负载范围内实现了软开关。实验结果表明,所设计的输入端多重并联拓扑具有稳定性高、可自由拓展、输出电压与负载无关的特点。

Aiming to the WPT system based on the problem that the single-switch inverter cannot be directly paralleled in multiple ways like the bridge circuit,an input-side multiple parallel WPT device is designed to improve its output power.The experimental device adopts current sharing coil and replaces wiring mode for current sharing.Through circuit equivalence,the feasibility of multi-parallel is theoretically verified and the output voltage is a constant voltage source.Saber simulation software is used to build a simulation platform to verify the correctness of the theory;the input-side triple parallel laboratory prototype with an output power of 1.8 kW is built.The maximum efficiency can reach 90.8%and the ZVS is realized in the full load range.The experimental results show that the designed topology has the characteristics of high stability and scalability.