ELECTRONIC DEVICE HAVING AN INDUCTIVE RECEIVER COIL WITH ULTRA-THIN SHIELDING LAYER AND METHOD

摘要

An electronic device which is inductively powered or charged has a receiver coil on which a metal object can be placed without causing deterioration of the coil's magnetic field and without generating heat in the metal object. An ultra-thin, flexible, high magnetic permeability metal foil having a thickness of 50μm or less is provided as a shielding layer between the coil and the object. Radial slits are provided in the shielding layer, which suppress unwanted eddy currents in the layer to reduce power transfer losses and heat generation.