Stromversorgungsgerät

摘要

A power supply apparatus for supplying a direct current to a load (14-1 or 14-2), comprising: a circuit breaker (1); an AC/DC converter (2) for converting an alternating current passed through the circuit breaker (1) into a direct current, the direct current being supplied to the load (14-1 or 14-2); a battery (7) for supplying a direct current to the load when the AC/DC converter is in an abnormal state; a switch (6b) connected between the output of the AC/DC converter (2) and the battery (7) and between the load (14-1 or 14-2) and the battery (7); and switch drive units (5 and 6a) for driving the switch in such a way that, when the circuit breaker is in an on state, the switch is turned on to connect the battery to the AC/DC converter (2) and to the load (14-1 or 14-2), and when the circuit breaker is in an off state, the switch is turned off to disconnect the battery from the load (14-1 or 14-2), whereby an unnecessary battery back up operation is prevented.