| 摘要 |
PROBLEM TO BE SOLVED: To provide a power supply device and an uninterruptible power supply system using the same which can stably continue a commercial power supply mode even when distortion of a voltage waveform of an AC power source is large, quickly start a battery power supply mode if the AC power source is electrically disconnected, and also involve low cost.SOLUTION: A power supply device 1 includes an inverter part 9 for converting a voltage Vu of an internal AC line inputted from an AC power source 6 into current and outputting the current to a battery 4, a relay 5, and a control part 50 for controlling them. An AC side of the inverter part 9 is connected to the AC power source 6 through the relay 5 and a breaker 8, and also connected to a load 7. When electrical connection between the internal AC line and the AC power source 6 is disconnected, the inverter part 9 inverts the polarity of the voltage Vu of the internal AC line.SELECTED DRAWING: Figure 1 |
