System, apparatus, and method for capacitive wireless charging
First Claim
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1. A capacitive wireless charging system, comprising:
- a charging circuit having adjustable operating characteristics, and including two coupling capacitors formed by two transmitter electrode plates of a source device at least partially overlapping two receiver electrode plates of a user device; and
a positioning device configured to move at least one of the transmitter electrode plates in order to adjust coupling characteristics of the coupling capacitors to reach a pre-determined threshold wherein the at least one transmitter electrode plate is configured to rotate around an axis that is geometrically off center of the at least one transmitter electrode plate and the coupling characteristics indicate a total coupling capacitance of the coupling capacitors.
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Abstract
A capacitive wireless charging system having a charging circuit and the operating characteristics of the charging circuit can be adjusted. The charging circuit includes two coupling capacitors formed by two electrode plates at least partially overlapping two other electrode plates, where the coupling characteristics of the coupling capacitors can be adjusted by moving at least one of the electrodes. When the coupling characteristics of the coupling capacitors reach a pre-determined threshold, the operating characteristics of the charging circuit can be adjusted to optimize the power transfer efficiency of the capacitive wireless charging system.
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Citations
20 Claims
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1. A capacitive wireless charging system, comprising:
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a charging circuit having adjustable operating characteristics, and including two coupling capacitors formed by two transmitter electrode plates of a source device at least partially overlapping two receiver electrode plates of a user device; and a positioning device configured to move at least one of the transmitter electrode plates in order to adjust coupling characteristics of the coupling capacitors to reach a pre-determined threshold wherein the at least one transmitter electrode plate is configured to rotate around an axis that is geometrically off center of the at least one transmitter electrode plate and the coupling characteristics indicate a total coupling capacitance of the coupling capacitors. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A source device, comprising:
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a power transmitter configured to transmit power to a user device and to have adjustable operating characteristics; two transmitter electrode plates configured to form two coupling capacitors by at least partially overlapping with two receiver electrode plates of the user device; and a positioning device configured to move at least one of the transmitter electrode plates in order to adjust coupling characteristics of the coupling capacitors to reach a pre-determined threshold; wherein the at least one transmitter electrode plate is configured to rotate around an axis that is geometrically off center of the at least one transmitter electrode plate and the coupling characteristics indicate a total coupling capacitance of the coupling capacitors. - View Dependent Claims (13, 14, 15, 16)
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17. A method of charging a battery of a user device by a source device, comprising:
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positioning the user device such that two transmitter electrode plates at least partially overlap two receiver electrode plates forming coupling capacitors; detecting, by a sensing device, coupling characteristics of the coupling capacitors; comparing, by a controller, at least one coupling characteristic of the coupling capacitors with a pre-determined threshold; controlling a positioning device to adjust the at least one coupling characteristic of the coupling capacitors when the at least one coupling characteristic does not reach the pre-determined threshold; controlling a charging circuit to adjust operating characteristics of the charging circuit when the at least one coupling characteristic has reached the pre-determined threshold; and charging the battery when power transfer efficiency is optimized by adjusting the operating characteristics of the charging circuit, the sensing device, the controller, and the positioning device provided in one of the source device and the user device. - View Dependent Claims (18, 19, 20)
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Specification