US Patent 11431196 Misalignment tolerant hybrid wireless power transfer system

The disclosure provides a wireless power transfer circuit that uses two coupled resonators provided in one of a primary or secondary wireless power transfer magnetic structure. The coupled resonators work together to compensate for changes in relative position. Each resonator has a planar coil, and the resonators are coupled with each other by magnetic coupling of the planar coils, which are located adjacent each other in either a side by side relationship or a partially overlapping relationship. The circuit is tolerant to misalignment of the magnetic structures (often referred to as pads) which magnetically couple with each other to enable the transfer of power. The changes in inductances as well as main, cross, and inter coupling between the coils of the primary and pick-up pads or structures show that a constant power transfer or charging profile can be maintained over a large operating region.