ADAPTIVE IMPEDANCE TUNING IN WIRELESS POWER TRANSMISSION
First Claim
1. A wireless power receiver, comprising:
- a rectifier for operable coupling to a receive antenna to couple with near field radiation in a coupling-mode region, the rectifier for converting the RF signal to a DC input signal;
a direct current (DC)-to-DC converter operably coupled to the DC input signal and a pulse-width modulation signal to generate a DC output signal responsive to the DC input signal and the pulse-width modulation signal; and
a pulse modulator operably coupled to the pulse-width modulation signal to adjust an AC impedance of the wireless power receiver by modifying a duty cycle of the pulse-width modulation signal to the DC-to-DC converter responsive to a voltage of the DC input signal.
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Accused Products
Abstract
Exemplary embodiments are directed to wireless power. A wireless power receiver includes a receive antenna for coupling with near field radiation in a coupling-mode region generated by a transmit antenna operating at a resonant frequency. The receive antenna generates an RF signal when coupled to the near filed radiation and a rectifier converts the RF signal to a DC input signal. A direct current (DC)-to-DC converter coupled to the DC input signal generates a DC output signal. A pulse modulator generate a pulse-width modulation signal to the DC-to-DC converter to adjust a DC impedance of the wireless power receiver by modifying a duty cycle of the pulse-width modulation signal responsive to at least one of a voltage of the DC input signal, a current of the DC input signal, a voltage of the DC output signal, and a current of the DC output signal.
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Citations
28 Claims
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1. A wireless power receiver, comprising:
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a rectifier for operable coupling to a receive antenna to couple with near field radiation in a coupling-mode region, the rectifier for converting the RF signal to a DC input signal; a direct current (DC)-to-DC converter operably coupled to the DC input signal and a pulse-width modulation signal to generate a DC output signal responsive to the DC input signal and the pulse-width modulation signal; and a pulse modulator operably coupled to the pulse-width modulation signal to adjust an AC impedance of the wireless power receiver by modifying a duty cycle of the pulse-width modulation signal to the DC-to-DC converter responsive to a voltage of the DC input signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method, comprising:
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coupling near field radiation in a coupling-mode region to generate an RF signal for a wireless power receiver; rectifying the RF signal to a DC input signal; converting the DC input signal to a DC output signal using a DC-to-DC converter; and modifying an AC impedance of the wireless power receiver by adjusting a power output of the DC output signal from the DC-to-DC converter responsive to a voltage of the DC input signal. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A wireless power receiver, comprising:
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means for coupling near field radiation in a coupling-mode region to generate an RF signal; means for rectifying the RF signal to a DC input signal; means for converting the DC input signal to a DC output signal using a DC-to-DC converter means; and means for modifying an AC impedance of the wireless power receiver comprising a means for adjusting a power output of the DC output signal from the DC-to-DC converter responsive to a voltage of the DC input signal. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28)
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Specification