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; and
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.
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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.
9 Citations
57 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; and 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A remote device for receiving power from an inductive power supply and for communicating data from the remote device to the inductive power supply, said remote device 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; and 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. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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33. 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; and 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. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51)
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52. 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; and 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. - View Dependent Claims (53, 54, 55, 56, 57)
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Specification