System and method for a variable impedance transmitter path for charging wireless devices
First Claim
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1. A method comprising:
- by a base station, receiving from a wireless device power-level information comprising a power level of a signal transmitted from the base station to the wireless device, wherein the base station comprises an electrical path having a continuously-controllable transmit impedance, and wherein the power-level information is sent by the wireless device and received by the base station using a particular communications protocol;
by the base station, determining, based on the power-level information, a first power transfer value of the signal when transmitted from the base station to the wireless device using a first transmit impedance;
by the base station, determining, based on the power-level information, a second power transfer value of the signal when transmitted from the base station to the wireless device using a second transmit impedance;
by the base station, 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; and
by the base station, time-interleaving the first transmit impedance with a default transmit impedance, wherein the time-interleaving comprises wirelessly charging the wireless device using the first transmit impedance and communicating with the wireless device using the default transmit impedance and the particular communications protocol, and wherein the first transmit impedance, the second transmit impedance, and the default transmit impedance are attained by changing the impedance of the continuously-controllable transmit impedance in a continuous manner.
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Abstract
In one embodiment, a method includes wirelessly coupling a transmitter to the 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 one of the first transmit impedance and the second transmit impedance based on the first power transfer value and the second power transfer value.
14 Citations
14 Claims
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1. A method comprising:
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by a base station, receiving from a wireless device power-level information comprising a power level of a signal transmitted from the base station to the wireless device, wherein the base station comprises an electrical path having a continuously-controllable transmit impedance, and wherein the power-level information is sent by the wireless device and received by the base station using a particular communications protocol; by the base station, determining, based on the power-level information, a first power transfer value of the signal when transmitted from the base station to the wireless device using a first transmit impedance; by the base station, determining, based on the power-level information, a second power transfer value of the signal when transmitted from the base station to the wireless device using a second transmit impedance; by the base station, 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; and by the base station, time-interleaving the first transmit impedance with a default transmit impedance, wherein the time-interleaving comprises wirelessly charging the wireless device using the first transmit impedance and communicating with the wireless device using the default transmit impedance and the particular communications protocol, and wherein the first transmit impedance, the second transmit impedance, and the default transmit impedance are attained by changing the impedance of the continuously-controllable transmit impedance in a continuous manner. - View Dependent Claims (2, 3, 4)
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5. A communications device comprising:
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an antenna; a plurality of transmit impedances; an electrical path having a continuously-controllable transmit impedance; and processing circuitry operable to; receive from a wireless device power-level information comprising a power level of a signal transmitted from the antenna to the wireless device, wherein the power-level information is sent by the wireless device and received by the communications device using a particular communications protocol; determine, based on the power-level information, a first power transfer value of the signal when transmitted from the antenna to the wireless device using a first transmit impedance of the plurality of transmit impedances; determine, based on the power-level information, a second power transfer value of the signal when transmitted from the antenna to the wireless device using a second transmit impedance of the plurality of transmit impedances; select 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; and time-interleave the first transmit impedance with a default transmit impedance, wherein the time-interleaving comprises wirelessly charging the wireless device using the first transmit impedance and communicating with the wireless device using the default transmit impedance and the particular communications protocol, and wherein the first transmit impedance, the second transmit impedance, and the default transmit impedance are attained by changing the impedance of the continuously-controllable transmit impedance in a continuous manner. - View Dependent Claims (6, 7, 8, 9)
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10. A method comprising:
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by a base station, wirelessly coupling the base station to one or more wireless devices using a wireless communication protocol, wherein the base station comprises an electrical path having a continuously-controllable transmit impedance; and for each wireless device; by the base station, sending a plurality of signals using a plurality of transmit impedances, respectively, from the base station to the wireless device; by the base station, receiving from the wireless device using the wireless communication protocol power-level information comprising a plurality of power levels of the plurality of signals, respectively, sent from the base station to the wireless device; by the base station, determining, based on the power-level information, a plurality of power transfer values for the plurality of signals, respectively; by the base station, selecting, from the plurality of transmit impedances, a specific transmit impedance based on the power-level information indicating that a power value associated with the specific transmit impedance is greater than at least one other power value of the plurality of power transfer values; and by the base station, time-interleaving the specific transmit impedance with a default transmit impedance, wherein the time-interleaving comprises wirelessly charging the wireless device using the specific transmit impedance and communicating with the wireless device using the default transmit impedance and the wireless communication protocol, and wherein the plurality of transmit impedances, the specific transmit impedance, and the default transmit impedance are attained by changing the impedance of the continuously-controllable transmit impedance in a continuous manner. - View Dependent Claims (11, 12, 13, 14)
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Specification