Patent ID: 7315234

Claim:
A load control apparatus connected to a master station through a power line supplied with direct-current power and driven by the direct-current power supplied from the power line to communicate with the master station through the power line, the load control apparatus comprising: a communication part connected to the power line to communicate with the master station with use of a communication signal having predetermined frequency; first and second branch lines connected to the power line; an impedance element connected to only the second branch line; a load connected to only the first branch line and driven by the direct-current power supplied through the first branch line; a capacitance element connected in parallel with the load, the capacitance element having a capacitance resonating with an inductance component of the load and the frequency of the communication signal; a control part configured to perform a variety of processes, based on the communication signal received by the communication part communicating with the master station; and a circuit power part connected to the second branch line through the impedance element and configured to produce desired power from the direct-current power supplied through the second branch line and configured to supply the communication part and the control part with the desired power.