Power supply device

A power supply device is coupled to an AC power source, a primary load and a secondary load. The power supply device comprises an uninterruptible power system, a generator system, a power conversion system and a controller. The input side of the uninterruptible power system is connected with the AC power supply and the secondary load, and the output side is connected with the primary load. The power conversion system includes a first power conversion path having a first end connected to a primary load and an output side and a second power conversion path having a first end connected to a secondary load and an input side. And the second end of the first power conversion path and the second end of the second power conversion path are jointly connected to the direct current bus. When the controller judges that the alternating current power supply is abnormal, the controller controls to cut off the alternating current power supply and starts the uninterruptible power supply system to supply power to the main load