| abstract |
(57) [Summary] [PROBLEMS] To improve energy efficiency as a whole power supply system and minimize electric power costs. A power supply device (1) includes an AC input system (2), A C input system 3 and a plurality of AC or DC output systems 4 are provided. The input system 2a to which commercial power is supplied is connected to the switching unit 11 through the detection unit 6 that detects a voltage and a phase. AC-DC converter 7 converts AC input system 2 to DC And the DC-DC converter 10 is connected to the DC input system 3 Is converted to DC and output to the switching unit 11. DC-AC The inverter 8 converts the DC input system into AC, and outputs the AC to the switch 11 via the insulating transformer 9. Switching unit 1 1 is a commercial power input 2a according to the control of the control unit 12, An AC power supply or a DC power supply obtained from the AC-DC converter 7, the DC-AC inverter 8, and the DC-DC converter 10 is arbitrarily connected to the plurality of output systems 4. |