| 摘要 |
PURPOSE:To reduce power consumption and to obtain a stable control signal, by dividing a lot of AC input signals into a low voltage, and supplying one output to a controller after selection. CONSTITUTION:A voltage division circuit 1 divides a lot of higg voltage AC input signals with ICs. The output is given to a multiplexer 3 and the signal is selected with a scanning signal giving from a controller 2 via a photocoupler 5 through sequential switching. The selected signal is wave-shaped at 4 to produce a stable rectangular wave without complicated pulse waves as the result of oscillation at rise and fall. After this rectangular wave is insulated at a photocoupler 5 and sent to the controller 2 including a CPU. |
