| 摘要 |
PURPOSE:To detect the break of the voltage of different AC power sources by monitoring the voltage of different power sources, with circuits having the same tolerance. CONSTITUTION:On the side of the light emitting diode 9 of a photocoupler 8 is made a primary circuit, which has AC power input terminals 1 and 2 through a capacitor 3 and an input resistance 5 connected in series, and on the side of the phototransistor 10 of the photocoupler 8 is made a secondary circuit, which has a switching circuit equipped with transistors 13 and 14, an interpolating capacitor 4, and a resistor 6, a cap terminal 27, and a battery terminal 28, and detects the power stoppage of the AC power sources and operates the switching circuit. |
