Abstract:

In the traditional wireless power transmission (WPT) system,when the coil is offset,the coil coupling coefficient will change significantly,which will lead to the sharp change of system output power.This problem limits the application and promotion of WPT.In order to solve the problem of output power imbalance caused by coil offset,this paper takes the anti-offset performance of WPT with double-sided LCC topology as the research object,and proposes a method of parameter optimization of compensation network based on PSO algorithm.In this method,two freely adjustable variables are used to optimize the compensation parameters of double-sided LCC,so that the system can automatically adjust the current of transmitting coil and maintain relatively stable output power.Finally,a 200 W experimental prototype is built.When the coil side offset percentage is 40%,the output power fluctuation ratio is less than 10%,and the whole machine efficiency remains above 81%.

Key words: wireless power transmission (WPT) system, double-sided LCC topology, anti-migration performance, parameter optimization