| 摘要 |
PROBLEM TO BE SOLVED: To make it possible to conduct a residual charge confirmation test for a secondary battery by stopping the operation of a primary-side switching device by an external signal. SOLUTION: When the voltage of a commercial power supply 1 drops or the commercial power supply 1 stops, a secondary battery 14 becomes an input source for a tertiary converter 72 and then a tertiary side switching device 11 comes to an active state and stabilized power is supplied to a load 24 from the secondary battery 14 without even a short cut of power. By stopping a primary side switching device 8 at the primary side circuit 1a by, for example, an external command based on an execution command, etc., from a computer software, the power supplying circuit is automatically switched from the primary side circuit to the discharging circuit 3d side which has the secondary battery 14 as an input source. At that time, when the secondary battery 14 is discharged by 90% and it reaches the terminal voltage, a battery voltage drop signal is generated and the signal is received by the computer again and a battery residual charge confirmation test is performed. Therefore, the secondary battery can be checked periodically and thereby a power cut preventive measure can be taken. |
