| 摘要 |
PURPOSE:To enable to supply electric power to the load, by detecting the connection of the load to the outlet to turn the receiver on even if the turn-on control signal from the transmitter does not exist. CONSTITUTION:The rectification output of AC power source 8 is applied to AND gates G10 and G11 through inverter gates G6-G9. Demodulating circuit 10 opens one of gates G10 and G11 by the turn-on and off control signal from the transmitter. Set-reset FF11 drives transistor Q2 according to outputs of gates G10 and G11 to turn on and off load switching contact 6. In case of no signal from the transmitter, when load 7 is connected to outlet 12, load detecting circuit 13 detects this connection and sets FF11 through waveform shaping circuit 14 and transistor Q3 to turn contact 6 on. |
