Auxiliary receiver coil to adjust receiver voltage and reactance
First Claim
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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.
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Abstract
In a wireless charging system, a receiver device includes a second coil that performs a reactance shift. The reactance shift may be used to conform the device reactance to a reactance range, or to adjust a rectified voltage of the wireless power provided to the device electronics. The reactance shift differs from resonance matching in that the power transfer efficiency may be decreased.
15 Citations
20 Claims
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1. An electronic device, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of performing reactance adjustment in a wireless charging system, comprising:
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receiving power wirelessly, by an electronic device from a transmitter device, via a wireless power field generated by the transmitter device, wherein the electronic device has device electronics, a first coil coupled to the device electronics, a reactance adjustment circuit, a second coil coupled to the reactance adjustment circuit, and a control circuit coupled to the reactance adjustment circuit; wirelessly coupling the power and providing, by the first coil, 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; wirelessly coupling the power and providing, by the second coil, isolated from the first coil, 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 dynamically adjusting, by the control circuit, the tank reactance and in accordance therewith dynamically adjusting the device reactance. - View Dependent Claims (14, 15)
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16. A system, comprising:
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a transmitter device, including a transmitter coil, wherein the transmitter device is configured to generate a wireless power field; and 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 the wireless power field generated by the 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. - View Dependent Claims (17, 18, 19, 20)
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Specification