Patent ID: 9711972
Date: 2017-07-18
CPC Classifications: H01F,H02J

Claim:
1. An electronic device, comprising: device electronics; a first coil, coupled to the device electronics, wherein the first coil is configured to wirelessly couple power via a wireless power field generated by a transmitter device and to provide a first electrical current based on the power to the device electronics, wherein the device electronics and the first coil have a load impedance, wherein the load impedance includes a load reactance; a reactance adjustment circuit; a second coil, coupled to the reactance adjustment circuit, wherein the second coil is isolated from the first coil and configured to wirelessly couple the power via the wireless power field generated by the transmitter device and to provide a second electrical current based on the power to the reactance adjustment circuit to adjust device reactance of the electronic device presented to the transmitter device so as to control reflected impedance from the electronic device to the transmitter device, wherein the reactance adjustment circuit and the second coil have a tank impedance, wherein the tank impedance includes a tank reactance, wherein the tank reactance is adjustable, wherein a device impedance includes the load impedance and the tank impedance, and wherein the device reactance includes the load reactance and the tank reactance; and a control circuit, coupled to the reactance adjustment circuit, that is configured to dynamically adjust the tank reactance and in accordance therewith to dynamically adjust the device reactance.