Inductive power transmitter
First Claim
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1. An inductive power transmitter comprising:
- transmission circuitry having a coil, the transmission circuitry adapted to transmit wireless power to an inductive power receiver at a first frequency;
an inverter configured to drive the coil; and
control circuitry configured to;
control the inverter to cause the coil to produce a handshake signal at a second frequency that is higher than the first frequency;
responsive to receiving, via the coil, a response to the handshake signal from a non-authorised device proximate the coil, forgo transmission of the wireless power at the first frequency with the coil; and
responsive to not receiving, via the coil, a response to the handshake signal from a non-authorised device proximate the coil, transmit the wireless power at the first frequency with the coil.
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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.
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Citations
18 Claims
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1. An inductive power transmitter comprising:
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transmission circuitry having a coil, the transmission circuitry adapted to transmit wireless power to an inductive power receiver at a first frequency; an inverter configured to drive the coil; and control circuitry configured to; control the inverter to cause the coil to produce a handshake signal at a second frequency that is higher than the first frequency; responsive to receiving, via the coil, a response to the handshake signal from a non-authorised device proximate the coil, forgo transmission of the wireless power at the first frequency with the coil; and responsive to not receiving, via the coil, a response to the handshake signal from a non-authorised device proximate the coil, transmit the wireless power at the first frequency with the coil. - View Dependent Claims (2, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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3. The inductive power transmitter of claim wherein the transmission circuitry further comprises a tuning capacitor connected to the coil in series for tuning the transmission circuitry to the first frequency.
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16. A method of operating an inductive power transmitter comprising transmission circuitry including a coil adapted to transmit wireless power to an inductive power receiver at a first frequency, the method comprising:
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driving the transmission circuitry at a second frequency that is higher than the first frequency; modulating the second frequency according to a handshake signal; forgoing transmission of the wireless power at the first frequency with the coil when a response is received to the handshake signal from a non-authorised device proximate the coil; and transmitting the wireless power at the first frequency with the coil when a response is not received to the handshake signal from a non-authorised device.
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17. An inductive power transmitter comprising:
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transmission circuitry having a power transmitting coil, wherein the transmission circuitry is adapted to transmit wireless power to an inductive power receiver at a first frequency; an object detection coil configured to produce an object detection signal at a third frequency; an inverter configured to drive the object detection coil; and control circuitry configured to; control the inverter to cause the object detection coil to produce a handshake signal at a second frequency that is higher than the third frequency; responsive to receiving a response to the handshake signal from a proximate non-authorised device, forgo transmission of the wireless power at the first frequency with the power transmitting coil; and responsive to not receiving a response to the handshake signal from a non-authorised device, transmit the wireless power at the first frequency with the power transmitting coil.
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18. An inductive power transmitter comprising:
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transmission circuitry having a coil, the transmission circuitry adapted to transmit wireless power to an inductive power receiver at a first frequency; an inverter configured to drive the coil; and control circuitry configured to; control the inverter to drive the transmission circuitry at a sixth frequency prior to a second frequency, and to modulate the sixth frequency according to a predetermined signal in order to instruct an authorized receiver, having a non-authorised resonant device, to disable the non-authorised resonant device, the second frequency being modulated to provide a handshake signal to a non authorised device.
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Specification