BACKUP POWER-SUPPLY APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide a charging control system for achieving a system for reducing cost of a backup power supply apparatus using a Ni-MH battery as replacement from a lead storage cell.

SOLUTION: The DC power supply apparatus 1 supplies power to a load device 2 at normal time. Input of a charger 3 of constant current/constant voltage output is connected to a connection part of the DC power supply apparatus 1 and the load device 2. Output of the charger 3 is connected to a secondary battery 4 and the secondary battery 4 is charged at normal time. One or a plurality of diodes or FET connected in series are connected in a direction of input from output of the charger 3. Power is supplied from the secondary battery 4 to the load device 2 through the diodes or FET at the time of service interruption. Voltage of the charger 3 is controlled so that current is prevented from flowing in the diodes or parasitic diodes of FET.

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