Power supply apparatus

A power supply apparatus, comprising:

• a plurality of power modules for receiving alternating current power to provide the power to a load;
• an uninterruptible supply module installed on one side of the plurality of power modules to supply self-power to the load;
• an inverter module installed on one side of the plurality of power modules or the uninterruptible supply module to convert power and provide the converted power to the load;
• direct current bus bars provided inside enclosures of the plurality of power modules, the uninterruptible supply module, and the inverter module, respectively;
• and
• a connection bus bar for connecting adjacent direct current bus bars,
• wherein in the plurality of power modules and the uninterruptible supply module, an alternating current/direct current converter or a direct current/direct current converter is provided above the direct current bus bar, or the alternating current/direct current converter or the direct current/direct current converter is provided under the direct current bus bar,
• wherein the direct current bus bar has longitudinal connection portions formed in a lengthwise direction at opposite end portions thereof, and a lateral connection portion formed in a widthwise direction at a side portion thereof,
• wherein the connection bus bar has a coupling portion formed as a groove so that the longitudinal connection portion or the lateral connection portion is fastened thereto.