BACKUP POWER SUPPLY DEVICE, POWER SUPPLY SYSTEM, COMPUTER SYSTEM, METHOD FOR CONTROLLING POWER SUPPLY OF COMPUTER SYSTEM, AND RECORDING MEDIUM

摘要

A backup power supply device that is used as a backup for a normal power supply device that includes a first converter configured to convert a first alternating-current voltage into a first direct-current voltage and a second converter configured to convert the first direct-current voltage into a second direct-current voltage includes a first detector that is coupled to an output of the first converter and outputs a first detection signal when the first direct-current voltage is lower than a first predetermined value; a third converter that converts a second alternating-current voltage into a third direct-current voltage; a battery that is charged by the third direct-current voltage; and a first switch that connects an output of the battery or an output of the third converter to an input of the second converter based on the output of the first detection signal.