Patent ID: 8716882

Claim:
A system for transmitting communication signals, the system comprising: an injector circuit connected to a powered circuit conductor and configured to modulate an AC power signal with a time sequence of instantaneous voltage offsets over at least a portion of a voltage phase to produce one or more bits to be transmitted on the powered circuit conductor, wherein the one or more bits form a command, and wherein the injector circuit includes one or more asymmetrical networks that modulate the power signal with the instantaneous voltage offset, the instantaneous voltage offset having a first voltage offset for modulating a first polarity of the power signal and a second voltage offset for modulating a second polarity of the power signal, the first voltage offset being different than the second voltage offset; and a decoder connected to the powered circuit conductor and a load, the decoder configured to demodulate the instantaneous voltage offsets to extract the command to control the load based on a selected control scheme.