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US 2017/0317520 A1Published application
System and method for a variable impedance transmitter path for charging wireless devices
AssigneeFacebook, Inc.
InventorYael Maguire
Life of this patent
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Abstract
In one embodiment, a method includes wirelessly coupling a transmitter to a wireless device; determining a first power transfer value of a signal transmitted from the transmitter to the wireless device with a first transmit impedance; determining a second power transfer value of the signal transmitted from the transmitter to the wireless device with a second transmit impedance; and selecting the first transmit impedance based on received power-level information indicating that the first power transfer value is greater than the second power transfer value.
Claims20
A method comprising:
- by a transmitting device, receiving from a wireless device power-level information of a signal transmitted from the transmitting device to the wireless device, wherein the power-level information comprises a power level of the signal;
- by the transmitting device, determining, based on the power-level information, a first power transfer value of the signal transmitted from the transmitting device to the wireless device with a first transmit impedance;
- by the transmitting device, determining, based on the power-level information, a second power transfer value of the signal transmitted from the transmitting device to the wireless device with a second transmit impedance;
- by the transmitting device, selecting the first transmit impedance based on the power-level information indicating that the first power transfer value is greater than the second power transfer value.
1 more element
A communications device comprising:
- a transmitter configured to transmit a wireless signal to a wireless device;
- and
- processing circuitry coupled to the transmitter and configured to:
- receive from a wireless device power-level information of a signal transmitted from the transmitter to the wireless device, wherein the power-level information comprises a power level of the signal;
- determining, based on the power-level information, a first power transfer value of the signal transmitted from the transmitter to the wireless device with a first transmit impedance;
- determining, based on the power-level information, a second power transfer value of the signal transmitted from the transmitter to the wireless device with a second transmit impedance;
- selecting the first transmit impedance based on the power-level information indicating that the first power transfer value is greater than the second power transfer value.
4 more elements
A method comprising:
- wirelessly coupling a transmitter to one or more first wireless devices;
- and
- for each first wireless device,
- sending power-level information of a signal transmitted from the transmitter device to the first wireless device, wherein the power-level information comprises a power level of the signal;
- determining, based on the power-level information, a first power transfer value of the signal transmitted from the transmitter to the first wireless device with a first transmit impedance;
- determining, based on the power-level information, a second power transfer value of the signal transmitted from the transmitter to the first wireless device with a second transmit impedance;
- selecting the first transmit impedance based on the power-level information indicating that the first power transfer value is greater than the second power transfer value.
4 more elements
Dependencies are inferred from the claim text.