| 摘要 |
<p>PROBLEM TO BE SOLVED: To transmit a control signal by utilizing a power supply line to a load while supplying stable electric power to the load by replacing a partial waveform in a specific section of the voltage waveform of an AC power source to be applied to the load with a different waveform which is nearly equal in amplitude and period to the voltage waveform of the AC power source. SOLUTION: Master control equipment 3 replaces the voltage waveform A of the AC power source AC with the voltage waveform B, generated by inverting the voltage waveform A by a waveform processing part 3a only for a specific section T specified by a control part 3c, by a waveform arithmetic part 3b and supplies the resulting waveform to the load 2 and a control terminal 4 through the power supply line 1. The control terminal 4 extracts the specific section T from the output of the waveform arithmetic part 3b by a signal extraction part 4a and controls the load 2 through a load control part 4b. Consequently, the control signal can be transmitted by utilizing the power supply line 1 for supplying the electric power to the load 2, and the power source waveform to the load has no deleted waveform part, so the stable electric power can be supplied to the load 2.</p> |
