Patent ID: 7078666
Filing Date: 2006-07-18
Classification: H04B

Abstract:
1. A method of transmitting data in a wireless power transmission system comprising a power transmitter which comprises a first light source, means for directing light emitted by the first light source in a desired direction, and at least one power receiver which comprises a first photo-detector for receiving the emitted light and for converting it into electric current, the method comprising: transmitting, by a second light source included in the power transmitter, substantially parallelly and as pulses, light arranged around the light emitted by the first light source, the intensity of the pulses being substantially lower than the intensity of the light emitted by the first light source and data bits being encoded in the pulses so as to determine a maximum time interval between two successive pulses, indicating, by a second photo-detector included in the power receiver, light pulses emitted by the second light source, determining data included in the light pulses and time between successive received light pulses, and transmitting a control signal indicating disturbance-free reception of data from the power receiver to the power transmitter in response to the time between successive received light pulses not exceeding the maximum time interval determined for two successive pulses.