SYSTEM AND METHOD OF PROVIDING COMMUNICATIONS IN A WIRELESS POWER TRANSFER SYSTEM

摘要

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.

主权项

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.