Efficiency Enhancement of Wireless Charging System By Applying Phase-shift and Amplitude Control Using Fuzzy Logic

Wireless power transfer is the technology that enables a power source to transmit electromagnetic energy to an electrical load across an air gap without interconnecting cords.However, its widespread application is hampered due to the relatively low efficiency of current Wireless power transfer (WPT) systems this study presents a concept to maximize the efficiency as well as to increase the amount of extractable power of a WPT system operating in no resonant operationby applying phase shift and amplitude control. The proposed method is based on actively modifying the equivalent secondary side load impedance by controlling the phase-shift of the active rectifier and its output voltage level. Simulation results are shown for the proposed concept. A fuzzy controller is used and the results are compared to other controllers.