WIRELESS INDUCTIVE POWER TRANSFER

摘要

A power transmitter (101) transfers power to a power receiver (105) using a wireless inductive power signal. The power transmitter (101) comprises an inductor (103) for providing the power signal and a power signal generator (207) for driving the inductor (103) to provide the power signal. The power receiver (105) comprises an inductor (107) for receiving the power signal and a transmitter (305) which transmits data messages to the power transmitter (101). The data are communicated by load modulation of the power signal in repeating load modulation intervals which are separated by intervening time intervals. The power transmitter (101) transmits data to the power receiver (105) by modulating the power signal with a message during the intervening time intervals and the power receiver demodulates the data in these time intervals. The power transmitter (101) transmits single bit of the message by modulating it across a plurality of intervening time intervals and the power transmitter (101) receives it by demodulating over these time intervals.

主权项

1. A power transmitter for transferring power to a power receiver using a wireless inductive power signal, the power transmitter comprising:
an inductor for providing the power signal; a power signal generator for driving the inductor to provide the power signal; a receiver for receiving data messages from the power receiver; a transmitter for transmitting data to the power receiver by modulating the power signal with a message; wherein the data messages are communicated by load modulation of the power signal in repeating load modulation intervals, the repeating load modulation intervals being separated by intervening time intervals, and wherein the transmitter is arranged to modulate a single bit of the message across a plurality of the intervening time intervals in accordance with a predetermined modulation pattern, the modulation pattern defining modulation deviations to apply to the power signal in each of the plurality of intervening time intervals.