Optimization design of four-coil mid-range wireless power transfer based on E-class amplifier
The E-class power amplifier presents an ideal solution for high-frequency power supply applications,characterized by its simple topology,high operational frequency,and efficiency. This paper conducts a detailed analysis of the transfer characteristics of a four-coil wireless power transfer(WPT) system and proposes an optimal design method to achieve high transfer efficiency. Additionally,with considering the operating status of the E-class amplifier,perfect matching of input resistance is achieved by adjusting the distance between the driving coil and transmitting coil. A 2.81 MHz four-coil mid-range WPT system employing an E-class amplifier is established. At a transfer distance of 3.6 times the side length of the transfer coil,the overall transfer efficiency from the power source to the load reaches 8.5％.
E-class power amplifiermid-range wireless power transferimpedance matchingefficiency optimization
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