Rack-mounted ups device for data centers

A rack-mounted UPS device for power supply of a load comprising multiple data processing devices, which can be inserted as load enclosures into a common UPS rack, the rack-mounted UPS device comprising

• at least one primary converter, which is connected between an AC source and a high voltage DC bus, whereby the primary converter is configured to operate in boost mode providing high voltage DC power output to the high voltage DC bus,
• at least one secondary converter, which is connected between a DC source and the high voltage DC bus, whereby the secondary converter is configured to operate in boost mode providing high voltage DC power output to the high voltage DC bus,
• at least one load supply converter, which is connected between the high voltage DC bus and an internal power distribution bus to provide at least one low level DC output voltage to the internal power distribution bus, whereby
• the at least one primary converter, the at least one secondary converter, and the at least one load supply converter are mounted in the UPS rack,
• the UPS rack comprises multiple insertion slots for receiving the load enclosures comprising the data processing devices, and
• the internal power distribution bus is provided for distribution of the load voltages between the enclosures.