Pulse width modulation data transfer over commercial and residential power lines method, transmitter and receiver apparatus

摘要

A method and apparatus for data transfer over existing or newly installed residential or commercial power lines is comprised of a transmitter and receiver unidirectionally communicating by phase cutting a portion of the received carrier voltage supply so as to receive a digital signal of low bandwidth. The resulting communication method is known as phase cut carrier, or PCC. The phase cut carrier communication method is shown to be able to addressably communicate lighting level commands for various types of lighting. In other embodiments, the phase cut carrier method may be used to control the powered status of addressably or nonaddressably controlled equipment.