A Highly Magnetic Integrated Method of LCC-Compensated IPT System With Excellent Misalignment Tolerance

Compactness and effectiveness are two basic considerations of the inductive power transfer (IPT) system. This article proposes a highly magnetic integrated method of LCC-compensated IPT system in which coupling coils are integrated into the coupler to improve the misalignment tolerance and realize the design of zero-voltage switching (ZVS) condition. The primary-side coupler integrates a double-layer reverse coil and an inductor coil in the LCC resonant network to improve misalignment tolerance and compactness. The secondary-side coupler integrates an inductor coil in the LCC resonant network to realize the ZVS condition. The main advantage is that extra space and magnetic cores for the external compensation inductors are saved, accompanied by excellent misalignment tolerance and ZVS parameter configuration. And output power stability under misalignment with fewer mutual inductance cancel sacrifices is realized. A detailed design method of the coupler is given based on the circuit analysis. A 3-kW power level prototype is implemented to validate the proposed design. Experimental results show that the IPT system with the proposed design can retain the well-aligned power at 40% misalignment. The mutual inductance cancellation caused by the reverse coil is reduced to 51%, and the efficiency reaches 93.1%.