CONTROL DEVICE, DIGITAL CONTROL POWER SUPPLY, AND CONTROL METHOD

摘要

In a digital control power supply, a mode control unit measures a first frequency and a second frequency for a difference between a second digital value and a target value. Based on the measured first frequency and second frequency and a predetermined threshold set to the first and second frequencies, the mode control unit determines whether an amplification factor for use in amplification processing by an amplifier is maintained at a current amplification factor or is changed to an amplification factor which is larger or smaller by 1 than the current amplification factor. This contributes to an improvement in noise resistance of the digital control power supply and prevents an output voltage from being unstable.

主权项

1. A control device that performs digital control of an output of a power supply, comprising:
a mode control unit that selects one of a plurality of mode signals corresponding to a plurality of different amplification factors; an amplifier that obtains an amplified output by amplifying the output of the power supply; an A/D converter that performs an A/D conversion on the amplified output to obtain a digital value; and an output control unit that obtains a difference between the digital value and a target value and controls 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: selects one of the plurality of mode signals based on the difference and sends the selected mode signal to the amplifier; measures a frequency with which the difference is out of a predetermined range; maintains the current mode signal when the frequency is less than a threshold; and selects another mode signal having a different amplification factor when the frequency becomes equal to or higher than the threshold.