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

Claim 14:
15. A system for magnetic inductive wireless charging of an electronic device, the system comprising:
a wireless-power transmitter having a first inductive coil for generating a first magnetic field based on an alternating current running through the first inductive coil;
a wireless-power receiver having a second inductive coil for generating an electric current, based on exposure to a magnetic field, to charge a load, the second inductive coil having a substantial size mismatch relative to the first inductive coil; and
a passive adapter positioned between the first inductive coil and the second inductive coil, the passive adapter comprising:
a third inductive coil aligned with the first inductive coil and substantially matching a size of the first inductive coil, the third inductive coil configured to generate energy based on exposure of the third inductive coil to the first magnetic field;
a capacitor connected to the third inductive coil, the capacitor configured to temporarily store the energy generated by the third inductive coil;
a fourth inductive coil substantially aligned with the second inductive coil and substantially matching a size of the second inductive coil, the fourth inductive coil configured to generate a second magnetic field, based on the energy stored by the capacitor, for the second inductive coil to receive; and
a core material positioned between the third inductive coil and the fourth inductive coil, the core material configured to prevent mutual coupling between the third and fourth inductive coils, the core material having a first permeability that is different from a second permeability of the fourth inductive coil.