Storage-battery over-discharge preventive device for no-break power unit

Abstract

Abstract PURPOSE: To prevent unwanted over-discharge and deterioration by performing a power backup from a storage battery only at the time of a true power failure. CONSTITUTION: An input voltage detection circuit 6 detects whether a commercial power 1 is normal or in service interruption and an output voltage detection circuit 7 detects whether a normal output voltage is outputted from a power circuit 3, to supply signals as the results of said detection to a comparator 8, respectively. When supplied with a power normal signal and a normal ON- signal, said comparator 8 ON-controls a switch circuit 9 so that a storage battery 4 is connected with the output of the power circuit 3 and charged with electricity. Also, when supplied with an in-power failure signal and said normal ON-signal are supplied, said switch circuit 9 is ON-controlled at the time of a power failure where a circuit breaker 2 is turned ON, and a discharge voltage is supplied from the storage battery 4 to a load. Further, when supplied with said power normal signal and an abnormal OFF-signal, the switch circuit 9 is OFF-controlled to prevent the circuit breaker 2 from being turned OFF arbitrarily by a user and the storage battery 4 from discharging eletricity unnecessarily though the electricity is not OFF. COPYRIGHT: (C)1989,JPO&Japio

Inventors

• 👤 Toru Koyashiki

Bibliographic Details