Null-Power Point Analysis of Wireless Power Transfer Coupler and Improvement Method

This study analyzes the causes of null-power point phenomena in wireless power transmission systems and discusses methods for designing and overcoming them. The occurrence of null-power points is influenced by the coupling level between couplers and can be designed based on the shape of the couplers. To overcome null-power points, a stacked CPT coupler with a 90% front plate area ratio is proposed, which can be effectively utilized in the implementation of multiple input single output (MISO) CPT systems.