Efficiency improvement for soft-switched wireless power transmitters
First Claim
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1. A method of operating an inverter of a wireless power transmitter in which a voltage of the inverter varies in response to a resonant network, the method comprising:
- (A) measuring a characteristic indicative of a load seen by the wireless power transmitter;
(B) determining a duty cycle of the inverter based upon the characteristic; and
(C) switching the inverter with the determined duty cycle,wherein the characteristic indicative of the load is an impedance, andwherein (B) comprises increasing the duty cycle when an imaginary component of the impedance decreases.
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Abstract
A wireless power transmitter includes an inverter in which a voltage varies in response to a resonant network and circuitry configured to (A) measure a characteristic indicative of a load seen by the wireless power transmitter, (B) determine a duty cycle of the inverter based upon the characteristic, and (C) switch the inverter with the determined duty cycle.
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Citations
13 Claims
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1. A method of operating an inverter of a wireless power transmitter in which a voltage of the inverter varies in response to a resonant network, the method comprising:
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(A) measuring a characteristic indicative of a load seen by the wireless power transmitter; (B) determining a duty cycle of the inverter based upon the characteristic; and (C) switching the inverter with the determined duty cycle, wherein the characteristic indicative of the load is an impedance, and wherein (B) comprises increasing the duty cycle when an imaginary component of the impedance decreases. - View Dependent Claims (2, 3, 4)
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5. A method of operating an inverter of a wireless power transmitter in which a voltage of the inverter varies in response to a resonant network, the method comprising:
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(A) measuring a characteristic indicative of a load seen by the wireless power transmitter; (B) determining a duty cycle of the inverter based upon the characteristic; and (C) switching the inverter with the determined duty cycle, wherein the characteristic indicative of the load is an impedance, and wherein (B) comprises decreasing the duty cycle when an imaginary component of the impedance increases.
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6. A wireless power transmitter, comprising:
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an inverter in which a voltage varies in response to a resonant network; and circuitry configured to (A) measure a characteristic indicative of a load seen by the wireless power transmitter; (B) determine a duty cycle of the inverter based upon the characteristic; and (C) switch the inverter with the determined duty cycle, wherein the characteristic indicative of the load is an impedance, wherein the characteristic indicative of the load is estimated based upon a magnitude of a signal measured by the wireless power transmitter, and wherein (B) comprises increasing the duty cycle when an imaginary component of the impedance decreases. - View Dependent Claims (7, 8, 9)
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10. A wireless power transmitter, comprising:
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an inverter in which a voltage varies in response to a resonant network; and circuitry configured to (A) measure a characteristic indicative of a load seen by the wireless power transmitter; (B) determine a duty cycle of the inverter based upon the characteristic; and (C) switch the inverter with the determined duty cycle, wherein the characteristic indicative of the load is an impedance, wherein the characteristic indicative of the load is estimated based upon a magnitude of a signal measured by the wireless power transmitter, and wherein (B) comprises decreasing the duty cycle when an imaginary component of the impedance increases.
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11. A non-transitory computer readable storage medium having stored thereon instructions, which, when executed by a processor, perform a method of operating an inverter of a wireless power transmitter in which a voltage of the inverter varies in response to a resonant network, the method comprising:
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(A) measuring a characteristic indicative of a load seen by the wireless power transmitter; (B) determining a duty cycle of the inverter based upon the characteristic; and (C) switching the inverter with the determined duty cycle, wherein the characteristic indicative of the load is an impedance, and wherein (B) comprises increasing the duty cycle when an imaginary component of the impedance decreases, and (B) comprises decreasing the duty cycle when an imaginary component of the impedance increases. - View Dependent Claims (12, 13)
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Specification