Load control apparatus and load control system

A load control system having a master station and a slave station connected to the master station through a power line to which direct-current power is supplied, the master station and the slave station being driven by the direct-current power supplied through the power line and communicating with each other through the power line, wherein the slave station 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 part of 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.