Patent ID: 6525517
Filing Date: 2003-02-25
Classification: G05F,Y10S

Abstract:
A power supply device that controls an output voltage from an output circuit by comparing a monitoring voltage, which is obtained by dividing the output voltage, with a reference voltage by means of a comparator and keeping the monitoring voltage equal to the reference voltage on a basis of a comparison output from the comparator,wherein as the comparator receives the monitoring voltage and the reference voltage respectively, and further receives, as a control voltage, a voltage varying according to a start-up charge voltage that is so produced as to increase gradually by a soft starting circuit when the power supply device is started up, the power supply device operates in such a way that, until the voltage varying according to the start-up charge voltage reaches a predetermined voltage equal to or higher than the reference voltage, the output voltage is produced according to the start-up charge voltage and that, after the voltage varying according to the start-up charge voltage has reached the predetermined voltage, the monitoring voltage is kept equal to the reference voltage.