Patent ID: 7456588

Claim:
An arrangement, comprising: an alternating current (AC) power source having a hot wire, a neutral wire, and a ground wire, wherein the AC power source includes a control station for injecting a power line carrier control signal between the neutral wire and the ground wire, the power line carrier control signal having a fundamental frequency; a load; and a circuit for supplying power to the load, comprising: an electromagnetic interference (EMI) filter coupled to the hot, neutral, and ground wires of the AC power source, the EMI filter having an effective common-mode resonant frequency, wherein the fundamental frequency of the power line carrier control signal is approximately equal to one of: (i) the effective common-mode resonant frequency of the EMI filter; and (ii) a harmonic of the effective common-mode resonant frequency of the EMI filter; power processing circuitry coupled between the EMI filter and the load; and a power line communication (PLC) circuit coupled to the EMI filter and the power processing circuitry, wherein the PLC circuit is operable to detect the power line carrier control signal and to direct the power processing circuitry to control the power provided to the load in dependence on the detected power line carrier control signal.