Adaptive impedance tuning in wireless power transmission
First Claim
1. A wireless power receiver, comprising:
- an antenna comprising a resonant circuit having a resonant circuit impedance, the antenna configured to receive a wireless power signal from a wireless power transmitter;
a rectifier coupled to the antenna and configured to convert the wireless power signal to a direct current input signal, the direct current input signal having voltage and current signals;
a direct current-to-direct current converter having an converter impedance, the direct current-to-direct current converter configured to generate a direct current output signal based at least in part on the direct current input signal and configured to adjust the converter impedance based at least in part on a control signal, the resonant circuit impedance responsive to adjustments in the converter impedance of the direct current-to-direct current converter; and
a circuit configured to adjust the control signal based at least in part on one of the voltage signal or the current signal of the direct current input signal.
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 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
21 Claims
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1. A wireless power receiver, comprising:
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an antenna comprising a resonant circuit having a resonant circuit impedance, the antenna configured to receive a wireless power signal from a wireless power transmitter; a rectifier coupled to the antenna and configured to convert the wireless power signal to a direct current input signal, the direct current input signal having voltage and current signals; a direct current-to-direct current converter having an converter impedance, the direct current-to-direct current converter configured to generate a direct current output signal based at least in part on the direct current input signal and configured to adjust the converter impedance based at least in part on a control signal, the resonant circuit impedance responsive to adjustments in the converter impedance of the direct current-to-direct current converter; and a circuit configured to adjust the control signal based at least in part on one of the voltage signal or the current signal of the direct current input signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method, comprising:
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receiving a wireless power signal from a wireless power transmitter at a wireless power receiver including a resonant circuit having a resonant circuit impedance; rectifying the wireless power signal to a direct current input signal; converting the direct current input signal to a direct current output signal; and adjusting a power output of the direct current output signal based in part on the direct current input signal to modify the resonant circuit impedance and to adjust a receive bandwidth of the wireless power receiver. - View Dependent Claims (12, 13, 14, 15)
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16. A wireless power receiver, comprising:
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means for receiving a wireless power signal from a wireless power transmitter, the receiving means having a resonant impedance; 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 receiving means comprising means for adjusting, based at least in part on the direct current input signal, an input converter impedance of the means for converting the direct current input signal to a direct current output signal based at least in part on the direct current input signal, to modify the resonant impedance. - View Dependent Claims (17, 18, 19, 20, 21)
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Specification