| 摘要 |
This provides a power supply apparatus, which detects a battery deterioration without any drop in an output to a load side, at a time of a voltage drop in a usual power supply or a service interruption of a commercial alternating power supply. The power supply apparatus according to the present invention is the power supply apparatus connected to a load circuit 2, and it is provided with: a battery charge controller 52 that is connected to a battery 28 and charges the battery 28 at a first voltage; and a voltage controller 51 that is connected to the load circuit 2 and generates a second voltage and controls the second voltage so as to make a voltage supplied to the load circuit 2 constant. An electric power is supplied to the load circuit 2 from at least one of the battery 28, the battery charge controller 52 and the voltage controller 51. Moreover, it includes a diagnosing circuit 18 for diagnosing the deterioration of the battery 28, in accordance with a battery voltage.
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