Wireless Power Transfer Analysis and Power Efficiency Enhancement via Adaptive Impedance Matching Network

Wireless power transfer (WPT) is a new global trend technology in the last two decades. There are some difficulties face energy to transfer with high efficiency, such as the axial distance, lateral and angular misalignment between the transmitter and receiver coils. The mutual inductance between coils is changed and consequently efficiency when the positions of coils varying. This paper calculates and modeling the mutual inductance between the transmitting coil and receiving coil by the finite element method. The series-series resonant circuits is analyzed and modeled at different positions of coils. The model is designed by calculated coils inductance and resonant capacitance for transmitter and receiver circuits. The effect of changing in the supply frequency, load, axial distance and lateral misalignment on power efficiency are simulated. The Impedance Matching Network (IMN) is used to improve the power efficiency with variable axial distances and lateral misalignment. The adaptive IMN with bat algorithm technique is used to robust the power transfer efficiency.