Patent ID: 9203306
Filing Date: 2015-12-01
Classification: G05F,H02M

Abstract:
1. A control device that performs digital control of an output of a power supply, comprising: a mode control unit configured to select one of a plurality of mode signals corresponding to a plurality of different amplification factors; an amplifier configured to obtain an amplified output by amplifying the output of the power supply; an A/D converter configured to perform an A/D conversion on the amplified output to obtain a digital value; and an output control unit configured to obtain a difference between the digital value and a target value and control the output of the power supply according to the difference, the target value being a digital value for a target output of the power supply, wherein the mode control unit is configured to: select one of the plurality of mode signals based on the difference and send the selected mode signal to the amplifier; measure a frequency with which the difference is out of a predetermined range, the frequency being a number of occurrences the difference is out of the redetermined range over a set plurality of consecutive sampling timings the difference is measured; maintain the selected mode signal when the frequency is less than a threshold; and select another mode signal having a different amplification factor when the frequency becomes equal to or higher than the threshold.