Automatic tuning for wireless power transfer
First Claim
1. A device for a wireless power transfer system, the system having a wireless power transmitter (TX) and a wireless power receiver (RX), wherein:
- the wireless power transmitter comprises;
a TX resonant circuit that resonates at a TX resonant frequency; and
a signal generator that applies a generator signal having a generator frequency to the TX resonant circuit;
the wireless power receiver comprises an RX resonant circuit that resonates at an RX resonant frequency;
at least one of the wireless power transmitter and the wireless power receiver comprises a power detector that measures power in the corresponding resonant circuit;
at least one of the wireless power transmitter and the wireless power receiver comprises an auto-tuner that generates at least one tuning parameter based on the measured power, wherein the auto-tuner comprises;
a perturbation signal generator that generates a perturbation signal;
a phase-sensitive detector that receives a cost-function signal generated by the power detector based on the measured power and the perturbation signal and generates a filtered signal;
a negative-feedback controller that modifies the filtered signal to generate a modified signal; and
a summation node that combines the perturbation signal and the modified signal to generate the at least one tuning parameter;
the at least one tuning parameter is used to adjust at least one of the generator frequency, the TX resonant frequency, and the RX resonant frequency;
the device is one of the wireless power transmitter and the wireless power receiver; and
the device comprises at least one of the power detector and the auto-tuner.
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Accused Products
Abstract
In one embodiment, a wireless power transfer system has a wireless power transmitter and receiver. The transmitter has a transmitting resonant circuit that resonates at a first frequency and a signal generator that generates a signal at a second frequency. The transmitter also has a power detector that measures reflected power at the transmitting resonant circuit, and an auto-tuner that generates transmitter tuning parameters for adjusting the first and second frequencies to reduce reflected power. The receiver has a receiving resonant circuit that resonates at a third frequency based on a receiver tuning parameter. The receiver tuning parameter is generated by a power detector that measures power generated at the receiving resonant circuit, and an auto-tuner that generates the receiver tuning parameter to increase the load power.
32 Citations
23 Claims
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1. A device for a wireless power transfer system, the system having a wireless power transmitter (TX) and a wireless power receiver (RX), wherein:
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the wireless power transmitter comprises; a TX resonant circuit that resonates at a TX resonant frequency; and a signal generator that applies a generator signal having a generator frequency to the TX resonant circuit; the wireless power receiver comprises an RX resonant circuit that resonates at an RX resonant frequency; at least one of the wireless power transmitter and the wireless power receiver comprises a power detector that measures power in the corresponding resonant circuit; at least one of the wireless power transmitter and the wireless power receiver comprises an auto-tuner that generates at least one tuning parameter based on the measured power, wherein the auto-tuner comprises; a perturbation signal generator that generates a perturbation signal; a phase-sensitive detector that receives a cost-function signal generated by the power detector based on the measured power and the perturbation signal and generates a filtered signal; a negative-feedback controller that modifies the filtered signal to generate a modified signal; and a summation node that combines the perturbation signal and the modified signal to generate the at least one tuning parameter; the at least one tuning parameter is used to adjust at least one of the generator frequency, the TX resonant frequency, and the RX resonant frequency; the device is one of the wireless power transmitter and the wireless power receiver; and the device comprises at least one of the power detector and the auto-tuner. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A wireless power transfer system comprising a wireless power transmitter (TX) and a wireless power receiver (RX), wherein:
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the wireless power transmitter comprises; a TX resonant circuit that resonates at a TX resonant frequency; and a signal generator that applies a generator signal having a generator frequency to the TX resonant circuit; the wireless power receiver comprises an RX resonant circuit that resonates at an RX resonant frequency; at least one of the wireless power transmitter and the wireless power receiver comprises a power detector that measures power in the corresponding resonant circuit; at least one of the wireless power transmitter and the wireless power receiver comprises an auto-tuner that generates at least one tuning based on the measured power, wherein the auto-tuner comprises; a perturbation signal generator that generates a perturbation signal; a phase-sensitive detector that receives a cost-function signal generated by the power detector based on the measured power and the perturbation signal and generates a filtered signal; a negative-feedback controller that modifies the filtered signal to generate a modified signal; and a summation node that combines the perturbation signal and the modified signal to generate the at least one tuning parameter; and the at least one tuning parameter is used to adjust at least one of the generator frequency, the TX resonant frequency, and the RX resonant frequency. - View Dependent Claims (20, 21)
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22. A method for tuning a device in a wireless power transfer system, the system having a wireless power transmitter (TX) and a wireless power receiver (RX), wherein:
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the wireless power transmitter comprises; a TX resonant circuit that resonates at a TX resonant frequency; and a signal generator that applies a generator signal having a generator frequency to the TX resonant circuit; the wireless power receiver comprises an RX resonant circuit that resonates at an RX resonant frequency; and the method comprises; (a) detecting power in at least one of the wireless power transmitter and the wireless power receiver; (b) generating at least one tuning parameter based on the measured power, wherein step (b) comprises; (b1) generating a perturbation signal; (b2) receiving a cost-function signal generated based on the measured power and the perturbation signal, and generating a filtered signal; (b3) modifying the filtered signal to generate a modified signal; and (b4) combining the perturbation signal and the modified signal to generate the at least one tuning parameter; and (c) adjusting at least one of the generator frequency, the TX resonant frequency, and the RX resonant frequency based on the at least one tuning parameter.
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23. A device for a wireless power transfer system, the system having a wireless power transmitter (TX) and a wireless power receiver (RX), wherein:
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the wireless power transmitter comprises; a TX resonant circuit that resonates at a TX resonant frequency; and a signal generator that applies a generator signal having a generator frequency to the TX resonant circuit; the wireless power receiver comprises an RX resonant circuit that resonates at an RX resonant frequency; at least one of the wireless power transmitter and the wireless power receiver comprises a power detector that measures power in the corresponding resonant circuit; at least one of the wireless power transmitter and the wireless power receiver comprises an auto-tuner that generates at least one tuning parameter based on the measured power, wherein the auto-tuner; (i) applies a perturbation ramp to the at least one tuning parameter to generate a perturbed cost-function signal; (ii) measures the perturbed cost-function signal; and (iii) generates the at least one tuning parameter by optimizing the measured perturbed cost-function signal; the at least one tuning parameter is used to adjust at least one of the generator frequency, the TX resonant frequency, and the RX resonant frequency; the device is one of the wireless power transmitter and the wireless power receiver; and the device comprises at least one of the power detector and the auto-tuner.
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Specification