| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a stable output voltage free from dips by preventing generation of overshoot just after operation of one power supply unit is started, in a redundant power supply constituted of two power supply units, and restraining rapid change of a load current of the other power supply unit when AC input to the one power supply unit is cut off. SOLUTION: When power is supplied to one power supply unit 12 and operation is started, a reference voltage to a PWM control circuit 23 is increased gradually from a prescribed value toward a rated value, in order that an output voltage Vo1 of the power supply unit may increase gradually. When making power is cut off while the one power supply unit continues rated output operation, the reference voltage of the one power supply unit 12 is decreased gradually from the rated value, in order that an output voltage Vo may decrease gradually after a specified time from the time when the power cutoff is detected.</p> |
