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In the traditional wireless power transfer (WPT) system, the angular misalignment between the transmitting coil (Tx) and receiving coil (Rx) will reduce the output power and efficiency of the system. To solve this problem, an angular misalignment insensitive WPT system based on planar-type coils and a 3-D rotating magnetic field is proposed in this paper. First, the general architecture of the system is given. Then, based on the LCC-S resonant compensation network and the circuit topology of a three-phase half-bridge inverter, the mathematical model of the system is established and the modulation method of the 3-D rotating magnetic field is given. Finally, the experimental verification of the feasibility and effectiveness of wireless energy transfer under full angular misalignment using a planar-type coil structure and a 3-D rotating magnetic field is presented.
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