PURPOSE: To prevent a battery discharger from discharging an undischarged battery and from initiating the discharging of a discharged battery again by installing a timer for determining whether a battery is discharged or not discharged after the passage of a certain period of time after installation of the battery.
CONSTITUTION: When the line voltage Vcc changes and exceeds the threshold voltage VTH, the voltage of CT increases. According to the capacity of a capacitor connected to a terminal CT3, a one-shot pulse M.M(O) gives a clock to a terminal CK of D-FF22 from the zero output of a monostable transmission circuit M.M21. Since the second Vcc does not exceeds the VTH, the M.M(O) generates no clock. The third and the fourth Vcc exceeds the VTH, the M.M(O) generates a clock. A rise of the clock is CK1, CK2 in each case. The data of D-FF22 comes to the 'H' level when it exceeds the discharging set voltage.
UMETSU KOJI
SASAKI MASAYOSHI
