Wireless power system
First Claim
Patent Images
1. A transmitter for wireless power transfer, comprising:
- a TX coil;
a capacitor coupled across the TX coil;
at least one inductor coupled between a power source and the TX coil;
a pair of switching FETs including a first switching FET coupled between a first side of the capacitor and ground and a second switching FET coupled between a second side, opposite the first side, of the capacitor and ground, the gates of the first switching FET and the second switching FET being driven to provide an oscillating current through the TX coil,wherein the gate of the first switching FET is switched from off to on and the gate of the second switching FET is switched from on to off when a first voltage across the second switching FET decreases to zero volts; and
a resonant frequency shifting circuit coupled between drains of the first switching FET and the second switching FET, the resonant frequency shifting circuit being driven by a modulator.
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Abstract
The present disclosure relates wireless power transfer. In some embodiments, DC power is received through one or more inductors and switched to provide alternating current through a TX coil with a pair of power FETs coupled between opposite sides of the TX coil and ground such that current flows through one of the pair of FETs at a time. In some embodiments, the pair of FETs can be driven in adaptive resonant mode to operate at a resonance. In some embodiments, the pair of FETs are driven at a particular frequency.
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Citations
15 Claims
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1. A transmitter for wireless power transfer, comprising:
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a TX coil; a capacitor coupled across the TX coil; at least one inductor coupled between a power source and the TX coil; a pair of switching FETs including a first switching FET coupled between a first side of the capacitor and ground and a second switching FET coupled between a second side, opposite the first side, of the capacitor and ground, the gates of the first switching FET and the second switching FET being driven to provide an oscillating current through the TX coil, wherein the gate of the first switching FET is switched from off to on and the gate of the second switching FET is switched from on to off when a first voltage across the second switching FET decreases to zero volts; and a resonant frequency shifting circuit coupled between drains of the first switching FET and the second switching FET, the resonant frequency shifting circuit being driven by a modulator. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of wirelessly transmitting power, comprising:
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receiving DC power through one or more inductors; and switching the DC power to provide alternating current through a TX coil with a pair of power FETs coupled between opposite sides of the TX coil and ground such that current flows through one of the pair of FETs at a time, wherein switching the pair of power FETs to transmit power using the TX coil includes monitoring a voltage at a drain of a first FET of the pair of power FETs coupled to a first side of the TX coil, and switching the first FET from off to on and a second FET of the pair of power FETs from on to off when the voltage decreases to zero volts; driving, through a modulator, a resonant frequency shifting circuit coupled between drains of the power FETs to provide resonant frequency shifts in the TX coil; and transmitting data through the resonant frequency shifts in the power transmitted by the TX coil. - View Dependent Claims (8, 9, 10)
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11. A transmitter for wireless power transfer, comprising:
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a TX coil; a capacitor coupled across the TX coil; a pair of switching FETs including a first switching FET coupled between a first side of the capacitor and ground and a second switching FET coupled between a second side, opposite the first side, of the capacitor and ground, the gates of the first switching FET and the second switching FET being driven to provide an oscillating current through the TX coil; at least one inductor coupled between a power source and the TX coil, wherein the at least one inductor includes two inductors, a first inductor coupled between the power source and a first drain of the first switching FET and a second inductor coupled between the power source and a second drain of the second switching FET; and a resonant frequency shifting circuit coupled between drains of the first switching FET and the second switching FET, the resonant frequency shifting circuit being driven by a modulator. - View Dependent Claims (12, 13, 14, 15)
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Specification