Misalignment Tolerance Improvement in Wireless Power Transfer Using LCC Compensation Topology

Misalignment between the transmitter coil and the receiver coil would in some cases lead to significant power and efficiency decline in a wireless power transfer system. This paper implements the LCC compensation topology to improve the horizontal misalignment tolerance under a certain load condition. The reason for the efficiency decline under misalignment is firstly analyzed based on the equivalent circuit model. Then the principle of the LCC compensation topology is briefly introduced and it is compared with the SS topology in terms of misalignment susceptibility and power transfer capability under different load conditions. An LCC compensated wireless power transfer system capable of achieving 92.8% DC-to-load efficiency was established. Using the LCC compensation topology, the horizontal high efficiency region has been extended to 40% of the coil size when the load resistance is 60 Omega, achieving 30% improvement compared to the SS compensation topology.