| 摘要 |
PURPOSE:To enable to obtain a plurality of output signals corresponding to a plurality of signals input to the primary side with one coupler, by providing a plurality of detection circuits at the secondary of photo-coupler. CONSTITUTION:At the primary of the photo-coupler 4, the transistor TR3 to drive it is connected, and the signal input terminal 7 controlling the amount of drive is connected to the emitter. Further, at the secondary, the voltage detection TR12, 18, 22 to detect the output level of the photo detecting element 8 are respectively provided. Further, the voltage level to the signal input to the primary of the coupler 4 is detected and respectively different output signal is output from the junction P2 or P3, or TR14, 15 depending on the level. Thus, one photo-coupler can produce a plurality of output signals different in the objective of application. |
