| 摘要 |
PURPOSE:To obtain correct control output timing by detecting zerocross signal from a commercial power source, and sending the zerocross signal to the transmission line in synchronization with the starting signal of a transmission signal. CONSTITUTION:A central processor 1 is obtained by adding a collision detecting circuit 14, a differentiating circuit 15, a synchronizing signal generating circuit 18 and a flip flop circuit 19 to a system consisting of a signal processing circuit 11, a current detecting circuit 12 and driving circuit 13. In the central processor 1, the zerocross signal is detected from the commercial power source, and the zerocross signal is sent to the transmission line in synchronization with the starting signal of the transmission signal. Thus, the correct control output timing can be obtained. |
