Research on Efficiency Optimization of Medium and Small Power Wireless Energy Transfer

摘要

Based on the basic principle of magnetically coupled resonant wireless power transfer (WPT), aiming at the series resonant circuit structure, the relationship between resonant topology efficiency and duty cycle is deduced. The PI algorithm is added to the secondary side to realize the constant current wireless power transfer for the load and to improve the overall efficiency of the system. The L-shaped load impedance matcher is used to improve the load adaptability of the system, so that the system can still ensure high efficiency under the condition of variable load. The parameters of the series resonant circuit are designed, and the experimental analysis is carried out by using Saber simulation. The experimental results show that the system realizes the constant current wireless power transfer after adding the control strategy, and can effectively ensure the high transmission efficiency of the system in the case of variable load.