PROTECTION DEVICE AND METHOD FOR POWER TRANSMITTER
First Claim
1. A wireless power transmission device, the device comprising:
- a transmit antenna;
a transmit circuit configured to generate a power transmit signal for powering the transmit antenna to generate a wireless field sufficient for wirelessly charging a device;
a detection circuit configured to sense a strength of an electromagnetic field received by the transmit antenna and further configured to generate an sense signal indicating the strength of the electromagnetic field received by the transmit antenna; and
a power control circuit configured to control a switch, based at least partly on the sense signal, to attenuate an electrical coupling between the transmit antenna and the transmit circuit such that the received electromagnetic field is inhibited from damaging at least one of the transmit antenna or the transmit circuit through the electrical coupling.
1 Assignment
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Accused Products
Abstract
Aspects of a protection circuit and method are disclosed. A transmit circuit generates a power transmit signal for powering the transmit antenna to generate a wireless field sufficient for wirelessly charging a device. A detection circuit senses a strength of an electromagnetic field received by the transmit antenna and further configured to generate an sense signal indicating the strength of the electromagnetic field received by the transmit antenna. A power control circuit controls a switch based at least partly on the sense signal. The power control circuit can attenuate an electrical coupling between the transmit antenna and the transmit circuit such that the received electromagnetic field is inhibited from damaging the transmit antenna or the transmit circuit.
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Citations
20 Claims
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1. A wireless power transmission device, the device comprising:
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a transmit antenna; a transmit circuit configured to generate a power transmit signal for powering the transmit antenna to generate a wireless field sufficient for wirelessly charging a device; a detection circuit configured to sense a strength of an electromagnetic field received by the transmit antenna and further configured to generate an sense signal indicating the strength of the electromagnetic field received by the transmit antenna; and a power control circuit configured to control a switch, based at least partly on the sense signal, to attenuate an electrical coupling between the transmit antenna and the transmit circuit such that the received electromagnetic field is inhibited from damaging at least one of the transmit antenna or the transmit circuit through the electrical coupling. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of protecting a wireless power transmission device, the method comprising:
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sensing a strength of an electromagnetic field received by a transmit antenna; generating an indication signal indicating the strength of the electromagnetic field received by the transmit antenna; and attenuating an electrical coupling between the transmit antenna and a transmit circuit based on the indication signal such that the received electromagnetic field is inhibited from damaging at least one of the transmit antenna or the transmit circuit through the electrical coupling. - View Dependent Claims (14, 15, 16)
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17. A wireless power transmission apparatus, the apparatus comprising:
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means for sensing a strength of an electromagnetic field received by a transmit antenna and for generating an indication signal indicating the strength of the electromagnetic field received by the transmit antenna; and means for attenuating an electrical coupling between the transmit antenna and a transmit circuit based on the indication signal such that the received electromagnetic field is inhibited from damaging at least one of the transmit antenna or the transmit circuit through the electrical coupling. - View Dependent Claims (18, 19, 20)
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Specification