This technical paper proposed the analysis and design the wireless power transfer by using inductive coupling concept to transmit the electric power. To transmit the power in AC, a full-bridge AC-DC resonant converter is applied to convert a DC supply to AC. The efficiency of the system is identifying by compared with 2 types of receiver which is between triangle and square shape. Beside that is orientation between the transmitter and receiver coil. When both of coils share a single axis, the transfer efficiency is maximal but otherwise the efficiency becomes lower. Lastly, the distance of the air gaps between transmitter and receiver coil affect the efficiency of the power transmitting. More closely the distance between both of the coil, the power transmitting will be more efficient.
Muhamad Akmal Md Radzi (Mon,) studied this question.