DIRECT-CURRENT POWER SUPPLY DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a direct-current power supply device wherein deterioration in an electric double layer capacitor as backup power supply can be reduced as much as possible.

SOLUTION: The direct-current power supply device includes: a direct-current driving power supply circuit 6 that has electric double layer capacitors 8 and 9 for large current and is supplied with direct-current power and thereby supplies direct-current driving power to a real time clock 1; an electric double layer capacitor 13 for low consumption current for supplying backup power to the real time clock 1; a discharge circuit 15 that discharges the electric double layer capacitor 13 when the direct-current power is on; and a charge/discharge circuit 21 that discharges the electric double layer capacitors 8 and 9 and charges the electric double layer capacitor 13 for backup power supply when the direct-current power is off.

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