Patent ID: 11923696
Assignee: GOOGLE LLC
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 6:
7. A system for magnetic inductive wireless charging of an electronic device, the system comprising:
a passive adapter comprising a first coil and a second coil electrically connected via a capacitor to form a resonant circuit, the second coil including a first core material, the passive adapter including a second core material positioned between the first coil and the second coil, the second core material configured to prevent mutual coupling between the first coil and the second coil, the first core material having a first permeability that is different from a second permeability of the second core material, the passive adapter configured to:
receive energy based on exposure of the first coil to a magnetic field that induces an electric current in the first coil;
temporarily store energy in the capacitor based on the electric current induced in the first coil;
pass the stored energy from the capacitor to the second coil; and
generate, at the second coil, an additional magnetic field based on the energy passed to the second coil; and

a receiver coil magnetically coupled to the second coil, the receiver coil configured to receive, via the additional magnetic field, additional energy that induces a second electric current in the receiver coil, the second electric current usable to charge a load.