A Mutual Inductance Estimation Method for S‐LCC Compensated IPT System With High‐Misalignment Tolerance and CV Output

ABSTRACT

A mutual inductance estimation method for S‐LCC compensated inductive power transfer (IPT) system is proposed in this paper to realize constant voltage (CV) output regardless of the coil misalignments. In the proposed mutual inductance estimation method, quadruple D coil and quadrature coil are adopted as the measurement coil and the power transfer coil, respectively. Such a coil structure is capable of maintaining accurate output voltage regulation with the x‐, y‐, and z‐ misalignments tolerance. As the output voltage of the proposed IPT system can be obtained from the primary‐side measurement coil, the wireless communication links (WCLs) for output voltage regulation can be eliminated, which leads to improved dynamic response and reliability of IPT system. A prototype of 1 kW/270‐V output is fabricated to verify the proposed mutual inductance estimation method. Experimental results show that the proposed S‐LCC compensated IPT system can tolerate −150 mm to +150 mm x‐misalignment, −150 mm to +150 mm y‐misalignment, and −20 mm to +60 mm z‐misalignment with CV output, without using any dedicated WCLs.