| 摘要 |
PROBLEM TO BE SOLVED: To provide an uninterruptible power supply unit capable of improving efficiency in changing a battery, and completely equalizing diversion of ripple current from an inverter to DC capacitors on DC negative side, thus attaining high cooling efficiency and downsizing. SOLUTION: A plurality of batteries, being combined in a tray, are supported with a supporting structure as a unit. Ground conductors of a plurality of capacitors for an inverter DC power supply comprise series-connection conductors connecting the capacitors in series and parallel-connection conductors connecting the series-connection conductor in parallel. An air introduction device is provided between two groups of power conversion elements cooled by two cooling fans, which supplies cooling air flowing through the power conversion elements to reactors and discharges it as a flow separate from each other. |
