| 摘要 |
PURPOSE:To obtain a power supply device for parallel operation that does not increase the blind sector region although the set level of voltage is increased with a low cost required for remodeling, by using the reference voltage of an output voltage detection comparator also for the reference voltage of a low voltage alarm circuit. CONSTITUTION:A constant voltage power supply device 1 includes an output voltage detection comparator 3 that controls the output voltage to a constant level and a low coltage alarm circuit 4 that detects a reduction of the output voltage. The reference voltage of the circuit 3 is used also for the reference voltage of the circuit 4. Then the circuit 4 is actuated in accordance with the variation of the output voltage. Thus the blind sector region where no alarm is delivered is not increased although the set level of voltage varies to reduce the number of component parts. In such way, a power supply device suited to a parallel operation is obtained with a low cost. |
