METHODS AND APPARATUS FOR EFFICIENT WIRELESS POWER TRANSFER
First Claim
1. An apparatus for transmitting wireless power, comprising:
- a power transmission circuit having a first antenna and configured to provide power sufficient to charge a receiver via a first magnetic field, wherein the power transmission circuit experiences a level of impedance based at least in part on an impedance of the receiver; and
a power transceiver circuit coupled to the power transmission circuit, the power transceiver circuit having a transceiver impedance and configured to;
in a first mode, receive power from the power transmission circuit and generate a second magnetic field; and
in a second mode, receive power from the first magnetic field and maintain the level of impedance experienced by the power transmission circuit within a target impedance range based on controlling variations in the transceiver impedance.
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Accused Products
Abstract
An aspect of this disclosure is an apparatus for receiving power wirelessly. The apparatus comprises a power transmission circuit and a power transceiver circuit. The power transmission circuit has a first antenna and is configured to provide power sufficient to charge a receiver via a first magnetic field. The power transmission circuit experiences a level of impedance based at least in part on an impedance of the receiver. The power transceiver circuit has a transceiver impedance and operates in a first mode and a second mode. In the first mode, the power transceiver circuit is configured to generate a second magnetic field. In the second mode, the power transceiver circuit is configured to receive power from the first magnetic field and maintain the level of impedance experienced by the power transmission circuit within a target impedance range based on controlling variations in the transceiver impedance.
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Citations
30 Claims
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1. An apparatus for transmitting wireless power, comprising:
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a power transmission circuit having a first antenna and configured to provide power sufficient to charge a receiver via a first magnetic field, wherein the power transmission circuit experiences a level of impedance based at least in part on an impedance of the receiver; and a power transceiver circuit coupled to the power transmission circuit, the power transceiver circuit having a transceiver impedance and configured to; in a first mode, receive power from the power transmission circuit and generate a second magnetic field; and in a second mode, receive power from the first magnetic field and maintain the level of impedance experienced by the power transmission circuit within a target impedance range based on controlling variations in the transceiver impedance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of transmitting wireless power, comprising:
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providing power, via a power transmission circuit comprising a first antenna, sufficient to charge a receiver via a first magnetic field, wherein the power transmission circuit experiences a level of impedance based at least in part on an impedance of the receiver; generating a second magnetic field via a power transceiver circuit in a first mode based on power received from the power transmission circuit, wherein the power transceiver circuit is coupled to the power transmission circuit and has a transceiver impedance; receiving power from the first magnetic field via the power transceiver circuit in a second mode; and maintaining the level of impedance experienced by the power transmission circuit within a target impedance range based on controlling variations in the transceiver impedance. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. An apparatus for transmitting wireless power, comprising:
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means for providing power sufficient to charge a receiver via a first magnetic field, wherein the means for providing power experiences a level of impedance based at least in part on an impedance of the receiver; means for generating a second magnetic field in a first mode based on power received from the means for providing power, wherein the means for generating a second magnetic field is coupled to the means for generating power and has a transceiver impedance; means for receiving power from the first magnetic field in a second mode; and means for maintaining the level of impedance experienced by the means for providing power within a target impedance range based on controlling variations in the transceiver impedance. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification