Resonant Tuning Through Rectifier Time Shifting
First Claim
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1. A circuit comprising:
- a wireless power signal input to provide a wireless power input signal;
a switch network coupled to the wireless power signal input, the switch network comprising switches arranged to rectify the wireless power input signal to provide a wireless power output signal;
control circuitry in communication with the switch network, the control circuitry configured to;
respond to a current wireless power transfer operating goal by determining an impedance to implement;
purposefully introduce the impedance to the wireless power input signal via the switch network; and
cause the switches to rectify the wireless power input signal to produce the wireless power output signal.
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Abstract
A device includes support for wireless power transfer. The device may control the timing of switching devices in a rectifier circuit and implement resonant tuning techniques that facilitate the wireless power transfer, e.g., by purposefully introducing a real or complex impedance chosen to meet a current operating goal. The device may use the techniques in connection with wireless charging or wireless provision of power to run the device, as examples.
242 Citations
20 Claims
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1. A circuit comprising:
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a wireless power signal input to provide a wireless power input signal; a switch network coupled to the wireless power signal input, the switch network comprising switches arranged to rectify the wireless power input signal to provide a wireless power output signal; control circuitry in communication with the switch network, the control circuitry configured to; respond to a current wireless power transfer operating goal by determining an impedance to implement; purposefully introduce the impedance to the wireless power input signal via the switch network; and cause the switches to rectify the wireless power input signal to produce the wireless power output signal. - 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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determining a current wireless power transfer operating goal; receiving a wireless power input signal; rectifying the wireless power input signal with a switch network to provide a wireless power output signal; providing the wireless power input signal to control circuitry in communication with the switch network; and controlling the switch network by; determining desired timing for the switch network responsive to the operating goal; generating a comparison voltage responsive to the desired timing; and changing switch timing of the switch network responsive to a comparison of the wireless power input signal and the comparison voltage. - View Dependent Claims (14, 15, 16)
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17. A circuit comprising:
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a wireless power signal input to provide a wireless power input signal; switching transistors coupled to the wireless power signal input and arranged as a full wave rectifier operable to rectify the wireless power input signal into a wireless power output signal; a power output coupled to the full wave rectifier and configured to provide the wireless power output signal; a comparator network comprising individual comparators operable to selectively turn ON and turn OFF the switching transistors; and variable voltage sources configured to provide the individual comparators with tunable voltages responsive to a wireless power transfer operating goal, the individual comparators responsive to the tunable voltages and the wireless power input signal to modify switching timing of the switching transistors. - View Dependent Claims (18, 19, 20)
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Specification