System and method of providing communications in a wireless power transfer system
First Claim
1. A method of communicating data between a remote device and an inductive power supply using keyed modulation, said method comprising:
- receiving inductive power via a variable frequency power transmission signal from the inductive power supply;
encoding a data stream of bits into a fixed frequency communication signal;
modulating the fixed frequency communication signal on the variable frequency power transmission signal by toggling a load of a communication transmitter, wherein each bit of the data stream is represented by a plurality of modulations on the variable frequency power transmission signal; and
decoding the data stream from the variable frequency power transmission signal by timeslicing the variable frequency power transmission signal and comparing a DC offset between two time slices.
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Accused Products
Abstract
A communication system that uses keyed modulation to encode fixed frequency communications on a variable frequency power transmission signal in which a single communication bit is represented by a plurality of modulations. To provide a fixed communication rate, the number of modulations associated with each bit is dynamic varying as a function of the ratio of the communication frequency to the carrier signal frequency. In one embodiment, the present invention provides dynamic phase-shift-keyed modulation in which communications are generated by toggling a load at a rate that is a fraction of the power transfer frequency. In another embodiment, the present invention provides communication by toggling a load in the communication transmitter at a rate that is phase locked and at a harmonic of the power transfer frequency. In yet another embodiment, the present invention provides frequency-shift-keyed modulation, including, for example, modulation at one of two different frequencies.
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Citations
46 Claims
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1. A method of communicating data between a remote device and an inductive power supply using keyed modulation, said method comprising:
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receiving inductive power via a variable frequency power transmission signal from the inductive power supply; encoding a data stream of bits into a fixed frequency communication signal; modulating the fixed frequency communication signal on the variable frequency power transmission signal by toggling a load of a communication transmitter, wherein each bit of the data stream is represented by a plurality of modulations on the variable frequency power transmission signal; and decoding the data stream from the variable frequency power transmission signal by timeslicing the variable frequency power transmission signal and comparing a DC offset between two time slices. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A system for transferring power to a remote device from an inductive power supply and for communicating data from the remote device to the inductive power supply, said system comprising:
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a power receiver adapted to receive a variable frequency power transmission signal; a controller adapted to encode a data stream of bits into a fixed frequency communication signal; a communication transmitter adapted to selectively toggle a load for modulating the fixed frequency communication signal on the variable frequency power transmission signal, wherein each bit of the data stream is represented by a plurality of modulations on the variable frequency power transmission signal; and a detector configured to decode the data stream from the variable frequency power transmission signal by timeslicing the variable frequency power transmission signal and comparing a DC offset between two time slices. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A system for transferring power to a remote device from an inductive power supply and for communicating data between the remote device and the inductive power supply using keyed modulation, said system comprising:
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a power receiver adapted to receive a variable frequency power transmission signal; a controller for encoding a data stream of bits in to a fixed frequency communication signal; a communication transmitter selectively toggling a load for modulating the fixed frequency communication signal on the variable frequency power transmission signal, wherein each bit of the data stream is represented by a plurality of modulations on the variable frequency power transmission signal; and an inductive power supply controller configured to decode the data stream from the variable frequency power transmission signal by timeslicing the variable frequency power transmission signal and comparing a DC offset between two time slices. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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41. An inductive power supply for transferring inductive power to a remote device and for receiving data via backscatter modulation from the remote device, said inductive power supply comprising:
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a power transmitter for transmitting a variable frequency power transmission signal; a wireless communication receiver configured to detect modulation on the variable frequency power transmission signal, wherein the inductive power supply decodes a data stream from the variable frequency power transmission signal, and wherein each bit of the data stream is represented by a plurality of modulations on the variable frequency power transmission signal; and wherein the inductive power supply decodes the data stream by timeslicing the variable frequency power transmission signal and comparing a DC offset between two time slices. - View Dependent Claims (42, 43, 44, 45, 46)
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Specification