Inductive power transmitter
First Claim
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1. A wireless power transmitter comprising:
- a wireless power transfer coil;
detection circuitry configured to detect the proximity of a wireless power receiver and the proximity of an RFID device;
transmission circuitry coupled to the wireless power transfer coil and configured to generate a wireless power transfer field using the wireless power transfer coil; and
control circuitry configured to;
upon detection of the wireless power receiver proximate the wireless power transfer coil and absence of the RFID device proximate the wireless power transfer coil, control the transmission circuitry to generate the wireless power transfer field using the wireless power transfer coil; and
upon detection of the RFID device proximate the wireless power transfer coil, control the transmission circuitry to stop generating the wireless power transfer field using the wireless power transfer coil;
wherein an objection detection field is frequency or magnetically decoupled from the wireless power transfer field.
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Abstract
An inductive power transmitter comprising a transmission circuit having a coil, the transmission circuit tuned, adapted or optimised at or about a first frequency for inductive power transfer or object detection; an inverter operable to drive the transmission circuit at the first frequency; and a controller arranged to control the inverter to drive the transmission circuit at a second higher frequency, and to modulate a signal at the second higher frequency according to a predetermined handshake signal in order to generate a response from a predetermined non-authorised device proximate the coil.
70 Citations
14 Claims
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1. A wireless power transmitter comprising:
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a wireless power transfer coil; detection circuitry configured to detect the proximity of a wireless power receiver and the proximity of an RFID device; transmission circuitry coupled to the wireless power transfer coil and configured to generate a wireless power transfer field using the wireless power transfer coil; and control circuitry configured to;
upon detection of the wireless power receiver proximate the wireless power transfer coil and absence of the RFID device proximate the wireless power transfer coil, control the transmission circuitry to generate the wireless power transfer field using the wireless power transfer coil; andupon detection of the RFID device proximate the wireless power transfer coil, control the transmission circuitry to stop generating the wireless power transfer field using the wireless power transfer coil; wherein an objection detection field is frequency or magnetically decoupled from the wireless power transfer field. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of controlling a wireless power transmitter responsive to a detected radio frequency identification (RFID) or near field communication (NFC) signature, the method comprising:
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detecting at least one of a first impedance or a first power level related to an object in an inductive power transfer field of the wireless power transmitter; detecting at least one of a second impedance or a second power level related to the object; comparing the detected impedances or power levels to a library of known signatures of unauthorized RFID/NFC devices; and disabling wireless power transfer if an unauthorized RFID/NFC device is detected; wherein an objection detection field is frequency or magnetically decoupled from the wireless power transfer field. - View Dependent Claims (11, 12, 13, 14)
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Specification