Adaptive impedance tuning in wireless power transmission
First Claim
1. A wireless power receiver, comprising:
- a rectifier coupled to an antenna, the antenna configured to receive a wireless power signal, the rectifier configured to convert the wireless power signal to a direct current input signal;
a direct current-to-direct current converter configured to generate a direct current output signal based in part on the direct current input signal and a pulse-width modulation signal; and
a pulse modulator configured to adjust an alternating current impedance of the wireless power receiver by modifying, based in part on the direct current input signal, a duty cycle of the pulse-width modulation signal to the direct current-to-direct current converter.
1 Assignment
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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 field radiation and a rectifier converts the RF signal to a DC input signal. A direct current-to-direct current (DC-to-DC) converter coupled to the DC input signal generates a DC output signal. A pulse modulator generates 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.
291 Citations
33 Claims
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1. A wireless power receiver, comprising:
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a rectifier coupled to an antenna, the antenna configured to receive a wireless power signal, the rectifier configured to convert the wireless power signal to a direct current input signal; a direct current-to-direct current converter configured to generate a direct current output signal based in part on the direct current input signal and a pulse-width modulation signal; and a pulse modulator configured to adjust an alternating current impedance of the wireless power receiver by modifying, based in part on the direct current input signal, a duty cycle of the pulse-width modulation signal to the direct current-to-direct current converter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method, comprising:
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receiving a wireless power signal at a wireless power receiver; rectifying the wireless power signal to a direct current input signal; converting the direct current input signal to a direct current output signal; and modifying an alternating current impedance of the wireless power receiver by adjusting a power output of the direct current output signal based in part on the direct current input signal. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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22. A wireless power receiver, comprising:
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means for receiving a wireless power signal; means for rectifying the wireless power signal to a direct current input signal; means for converting the direct current input signal to a direct current output signal; and means for modifying an alternating current impedance of the wireless power receiver comprising a means for adjusting, based in part on the direct current input signal, a power output of the direct current output signal from the means for converting the direct current input signal to a direct current output signal. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A computer readable storage medium comprising instructions executable by a processor of an apparatus that cause the apparatus to:
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couple near field radiation in a coupling-mode region to generate a wireless power signal for a wireless power receiver; rectify the wireless power signal to a direct current input signal; convert the direct current input signal to a direct current output signal; and modify an alternating current impedance of the wireless power receiver by adjusting, based in part on the direct current input signal, a power output of the direct current output signal from the direct current-to-direct current. - View Dependent Claims (33)
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Specification