Wireless power system with capacitive proximity sensing
First Claim
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1. A method of wireless power transmission comprising:
- generating an electromagnetic field to wirelessly transfer power to a receive antenna, via a transmit antenna of a wireless power transmission system,exciting a first non-transmitting part of the wireless power transmission system, which is coupled to the transmit antenna; and
detecting, in the presence of a non-charging object, a first change in a parameter indicative of a coupling between the non-charging object and the first non-transmitting part.
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Abstract
This disclosure provides systems, methods and apparatus for tuning a transmit coil for operation in a plurality of frequency bands. In one aspect, a method of wireless power transmission is provided. The method includes exciting a first part of a wireless power transmission system, via a wireless power transmitter. The method further includes detecting, in the presence of a non-charging object, a first change in a first parameter. The first parameter is indicative of a coupling between the non-charging object and the first part. The method further includes varying a characteristic of the wireless power transmission based on said first change.
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Citations
20 Claims
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1. A method of wireless power transmission comprising:
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generating an electromagnetic field to wirelessly transfer power to a receive antenna, via a transmit antenna of a wireless power transmission system, exciting a first non-transmitting part of the wireless power transmission system, which is coupled to the transmit antenna; and detecting, in the presence of a non-charging object, a first change in a parameter indicative of a coupling between the non-charging object and the first non-transmitting part. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A system configured to provide wireless power transmission comprising:
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a first non-transmitting part; a transmit antenna configured to provide wireless power and to excite the first non-transmitting part coupled thereto; and a circuit configured to detect, in the presence of a non-charging object, a first change in a parameter indicative of a coupling between the non-charging object and the first non-transmitting part. - View Dependent Claims (14, 15, 16)
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17. An apparatus for wireless power transmission comprising:
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a first non-transmitting part; means for transmitting wireless power and for exciting the first non-transmitting part coupled thereto; and means for detecting a first change in a parameter indicative of a capacitive coupling between the non-charging object and the first non-transmitting part. - View Dependent Claims (18, 19, 20)
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Specification