| 摘要 |
PURPOSE:To feed a load with power from a power supply with an exact time lag behind turn ON of a power switch by bringing the first low potential at the noninverted input terminal '+' of a second comparator below the potential at the inverted input terminal '-' thereof upon turn OFF of the power switch. CONSTITUTION:Upon turn OFF of a power switch, first low potential at the noninverted input terminal '+' of a second comparator 33 drops below the potential at the inverted input terminal '-' on which a voltage has been applied from a terminal e through a delay circuit, thus turning the second comparator 33 ON. Consequently, a capacitor 28 is discharged through a diode 34 and the second comparator 33 upon turn OFF of the power switch. Since the capacitor 28 has not been charged when the power switch is turned ON again, a load 50 can be fed with power with exact time lag behind turn ON of the power switch. |
