With the development of internet cloud calculation, the demand of big data exist everywhere, in the future decade, the data centers will use powers as much as three times of nowadays.

The DC power supply device using UPS power supply in the data center can convert the single-phase AC 200V of commercial power supply into 380V DC power supply, and then supply power to each terminal. The server with power supply unit removed can supply 12V DC power. The conversion efficiency can ensure more than 97%, reduce the power conversion loss, and reduce the air conditioning power consumption caused by heating.