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A Special Magnetic Coupling Structure Design for Wireless Power Transfer Systems

Coil design is the key to inductive power transfer (IPT) systems. This paper investigates a special magnetic coupler, which contains Taichi and spiral coils. This article also studies the angular misalignment of Taichi coils and a decoupling phenomenon between the spiral coil and the Taichi coil. An IPT system is proposed to realize load-independent constant voltage (CV) output, which also utilizes the coupled inductor formed by two spiral coils. The decoupling phenomenon and the coupled inductor further ensure a compact system. The proposed system significantly reduces the unwanted cross-couplings, thereby making the compensation networks simple and straightforward. A laboratory prototype has been constructed to validate the proposed structure, which shows great agreement with the theoretical analysis.