System and method for providing communications in a wireless power supply
First Claim
1. A remote device configured to wirelessly receive power from a wireless power supply comprising:
- a principle load operating on electrical power;
a power receiver configured to wirelessly receive power for said principle load from a wireless power supply;
a communications transmitter for sending communication to the wireless power supply by backscatter modulation, said communication transmitter having a communication load and being configured to generate a communication signal by selectively applying said communication load to selectively vary an impedance of the remote device, said communication transmitter configured to preface each communication with a framing pulse, said framing pulse being a signal that does not correspond to any legitimate communication signal; and
wherein said communication load is selected to bias said communication signal sufficiently to prevent noise from causing a transition in said communication signal.
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Accused Products
Abstract
A wireless power transfer system with a remote device having a communication transmitter configured to initiate communications with a framing pulse to prevent noise from being mistaken for legitimate data. The communication system may employ a bi-phase modulation scheme, and the framing pulse may be generated to present no transitions in the communication signal during a specified period of time. The communication transmitter may produce the framing pulse by applying a load in the remote device. The present invention also provides a method for transmitting communication signals in a wireless power supply system including the general steps of: (a) preceding each communication with a framing pulse configured to present a bit sequence that does not exist in legitimate data communications, (b) maintaining the framing pulse for a period of time sufficient to effectively “reset” the communications receiver and (c) transmitting communications following the framing pulse.
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Citations
25 Claims
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1. A remote device configured to wirelessly receive power from a wireless power supply comprising:
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a principle load operating on electrical power; a power receiver configured to wirelessly receive power for said principle load from a wireless power supply; a communications transmitter for sending communication to the wireless power supply by backscatter modulation, said communication transmitter having a communication load and being configured to generate a communication signal by selectively applying said communication load to selectively vary an impedance of the remote device, said communication transmitter configured to preface each communication with a framing pulse, said framing pulse being a signal that does not correspond to any legitimate communication signal; and wherein said communication load is selected to bias said communication signal sufficiently to prevent noise from causing a transition in said communication signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A wireless power supply system comprising:
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a wireless power supply having a power transmitter, signal generating circuitry to apply a power supply signal to said power transmitter and a communication receiver for receiving communications communicated through said power transmitter by backscatter modulation, said wireless power supply controlling said signal generating circuitry as a function of said communications received by said communication receiver; and a remote device capable of being placed in sufficient proximity to said wireless power supply to wirelessly receive power from said wireless power supply, said remote device having a principle load, a power receiver and a communication transmitter, said communication transmitter configured to generate a communication signal to transmit communications to said communication receiver by backscatter modulation, said communication transmitter configured to preface each communication with a framing pulse, said framing pulse being a signal that does not correspond to any legitimate communication signal; and wherein said communication transmitter includes a communication load and is configured to generate said communication signal by selectively applying said communication load, wherein said communication load is selected to bias said communication signal sufficiently to prevent noise from causing a transition in said communication signal. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for transmitting communication signals from a remote device to a wireless power supply in a wireless power transfer system including:
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providing a remote device with a communication transmitter for generating communication signals by selectively applying a communication load to selectively vary an impedance of the remote device, the variations in impedance being communicated to the wireless power supply by reflected impedance, wherein the communication load is selected to bias the communication signals sufficiently to prevent noise from causing a transition in the communications signals; transmitting a framing pulse by varying the impedance of the remote device in a manner that does not correspond with legitimate data communications, whereby the wireless power supply will recognize that the framing pulse is not a legitimate data communication; and transmitting data communications following the framing pulse. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25)
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Specification