Patent ID: 11967836
Assignee: APPLE INC.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 17:
18. A wireless power transmitting device, comprising:
a power transmitting coil that is configured to transmit wireless power signals;
inverter circuitry coupled to the power transmitting coil;
a tuning capacitor that is connected in series with the power transmitting coil;
a parallel LC tank circuit; and
one or more switches operable in a first arrangement in which the parallel LC tank circuit is connected to the power transmitting coil and the power transmitting coil is tuned to a fundamental frequency and a harmonic frequency and a second arrangement in which the parallel LC tank circuit is not connected to the power transmitting coil and the power transmitting coil is tuned to the fundamental frequency.