ADAPTIVE POWER CONTROL FOR WIRELESS CHARGING
First Claim
1. A wireless power transmitter, comprising:
- a transmit antenna for generating a coupling-mode region of near field radiation for coupling to receive antennas on a plurality of receiver devices; and
a controller operably coupled to the transmit antenna, wherein the controller;
determines a power allocation within a recurring period for one or more of the plurality of receiver devices disposed within the coupling-mode region; and
adjusts a power level of the near field radiation responsive to a power requirement received from at least one of the plurality of receiver devices.
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Accused Products
Abstract
Exemplary embodiments are directed to wireless power transfer. A transmitter generates an electromagnetic field at a resonant frequency with a transmit antenna to create a coupling-mode region within a near field of the transmit antenna. The transmitter defines a beginning of a recurring period by on-off keying the electromagnetic field during a synchronization portion of the recurring period. During a power transmission portion of the recurring period, the transmitter couples portions of the electromagnetic field to different receive antennas of various receiver devices within the coupling-mode region. The transmitter also determines a power allocation within the recurring period for the various receiver devices disposed within the coupling-mode region and adjusts a power level of the near field radiation responsive to power requirements received from the receiver devices.
738 Citations
43 Claims
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1. A wireless power transmitter, comprising:
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a transmit antenna for generating a coupling-mode region of near field radiation for coupling to receive antennas on a plurality of receiver devices; and a controller operably coupled to the transmit antenna, wherein the controller; determines a power allocation within a recurring period for one or more of the plurality of receiver devices disposed within the coupling-mode region; and adjusts a power level of the near field radiation responsive to a power requirement received from at least one of the plurality of receiver devices. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A wireless power transmitter, comprising:
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a transmit antenna for generating a coupling-mode region of near field radiation for coupling to receive antennas on a plurality of receiver devices; a controller operably coupled to the transmit antenna, wherein the controller; determines a coupling ratio to one or more receiver devices within the coupling-mode region by receiving a transmission indicating an amount of power received from the receiver device; determines a radiated power not received by any receiver devices within the coupling-mode region responsive to the coupling ratio for each receiver device and a total transmitted power; and adjusts a power level of the near field radiation if the radiated power is above a predetermined threshold.
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13. A method of wireless power transfer, comprising:
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generating an electromagnetic field at a resonant frequency with a transmit antenna of a transmitter to create a coupling-mode region within a near field of the transmit antenna; defining a beginning of a recurring period by on-off keying the electromagnetic field during a synchronization portion of the recurring period; and during a power transmission portion of the recurring period; coupling the electromagnetic field to a receive antenna of a first receiver device within the coupling-mode region; and coupling the electromagnetic field to a receive antenna of a second receiver device within the coupling-mode region. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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22. A power transfer system, comprising:
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means for generating an electromagnetic field at a resonant frequency with a transmit antenna of a transmitter to create a coupling-mode region within a near field of the transmit antenna; means for defining a beginning of a recurring period by on-off keying the electromagnetic field during a synchronization portion of the recurring period; and during a power transmission portion of the recurring period; means for coupling the electromagnetic field to a receive antenna of a first receiver device within the coupling-mode region; and means for coupling the electromagnetic field to a receive antenna of a second receiver device within the coupling-mode region. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30)
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31. A wireless power receiver, comprising:
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a receive antenna for coupling with a coupling-mode region of near field radiation from a transmit antenna; a radio frequency (RF) to direct current (DC) converter operably coupled to the receive antenna for converting the coupled near filed radiation to a DC signal; a DC-DC converter operably coupled to the RF to DC converter for converting the DC signal to an output signal; and a processor operably coupled to the receive antenna, the RF to DC converter, and the DC-DC converter, wherein the processor; determines a desired power level for a receiver device operably coupled to the output signal; and controls the DC-DC converter to adjust the power level on the output signal to the desired power level. - View Dependent Claims (32, 33, 34, 35, 36, 37)
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38. A method for wireless charging a plurality of devices, comprising:
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receiving power requirements from said plurality of devices; and sequentially charging ones of said plurality of devices in connection with cloaking on each device to be charged and cloaking off devices not receiving charging. - View Dependent Claims (39, 40, 41, 42)
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43. A wireless charger, comprising:
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a receiver for wirelessly receiving power requirements from devices to be charged; a power component threshold detector; and a processor operable to change a power component of a signal to be transmitted in connection with monitoring readings from said power component threshold detector so as to meet said power requirements.
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Specification