Inductive Powering Surface for Powering Portable Devices
First Claim
1. A powering device comprising:
- an inductive powering surface, the inductive powering surface comprising an impedance auto-match circuit and other control circuits coupled to primary power coils, the impedance auto-match circuit and the other control circuits for selectively energizing the primary coils to transfer power via inductive coupling to secondary coil(s) in a portable device; and
wherein the impedance auto-match circuit is configured to detect voltage and current phase differences over time to calibrate a power factor to transfer an optimized power load to the secondary coil(s) to power the portable device.
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Accused Products
Abstract
Systems and methods for an inductive powering surface for powering portable devices are described. In one aspect, a powering device includes the inductive powering surface. The inductive powering surface includes multiple primary coils, an impedance auto-match circuit and other control circuits. The impedance auto-match circuit selectively energizes the primary coils to transfer power via inductive coupling to the secondary coil(s) in a portable device. The impedance auto-match circuit is configured to detect voltage and current phase differences over caused by positioning of the portable device on the inductive powering surface. The impedance auto-match circuit calibrates a power factor of the inductive powering surface to transfer an objectively maximized power load via inductive coupling to the portable device.
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Citations
20 Claims
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1. A powering device comprising:
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an inductive powering surface, the inductive powering surface comprising an impedance auto-match circuit and other control circuits coupled to primary power coils, the impedance auto-match circuit and the other control circuits for selectively energizing the primary coils to transfer power via inductive coupling to secondary coil(s) in a portable device; and wherein the impedance auto-match circuit is configured to detect voltage and current phase differences over time to calibrate a power factor to transfer an optimized power load to the secondary coil(s) to power the portable device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method to provide inductive power to a portable device, the method comprising:
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selectively energizing, by an impedance auto-match circuit in an inductive powering surface, primary coils in the inductive powering surface to provide power via inductive coupling to secondary coil(s) in a portable device; and wherein the power is based on detected voltage and current phase differences caused at least in part by positioning of the portable device on different respective areas of the inductive powering surface. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A method implemented by a powering device, the method comprising:
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selectively activating primary coils adjacent to secondary coil(s) in a portable device to transfer power via inductive coupling to the secondary coil(s), the portable device being detected in association with a surface of the powering device; measuring phase difference between current and voltage in the surface; controlling compensation capacitors in the surface based on the phase difference to calibrate a power factor for the surface, the power factor being calibrated to maximize power transfer via inductive coupling between the primary coils and the secondary coil(s); and while the primary coils are in adjacent association with the secondary coil(s); (a) re-measuring the phase difference between the current and the voltage; and (b) if the phase difference is larger than a pre-defined threshold, re-controlling compensation capacitors using the phase difference to re-calibrate the power factor to to maximize inductive power transfer between the primary coils and the secondary coil(s); and wherein power transferred via inductive coupling to the secondary coil(s) allows for operation of the portable device.
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Specification