COIL CONFIGURATIONS FOR INDUCTIVE POWER TRANSFER

摘要

An inductive power supply system in which the receiving unit includes a secondary coil and a plurality of resonating circuits with different characteristics. Each of the resonating circuits may include a resonating coil and a resonating capacitor. The resonating coils may be inductively coupled to the secondary coil so that energy may be transferred from one or more of the resonating coils to said receiving unit. The plurality of resonating circuits are configured to provide improved power transfer efficiency or performance at different distances between the primary coil and secondary coil. The present invention may also provide a method for tuning the wireless power system including the general steps of measuring an operating characteristic in the primary unit, measuring an operating characteristic in the receiver unit and tuning one or more of the components in the primary unit and the secondary unit based on a comparison of the two measurements.

主权项

1. A receiving unit for receiving power wirelessly from an inductive primary unit, said receiving unit comprising:
a secondary circuit configured to inductively couple with said inductive primary unit for receiving power wirelessly at a first range of distances between said receiving unit and said inductive primary unit; a resonating circuit configured to inductively couple with said inductive primary for receiving power wirelessly at a second range of distances between said receiving unit and said inductive primary unit, said resonating circuit including an adjustable element, wherein said resonating circuit is configured to inductively couple with said secondary circuit to transfer power from said inductive primary unit to said receiving unit, wherein said first range is different from said second range; and a controller electrically coupled to said adjustable element, said controller for selectively adjusting said adjustable element.