| 摘要 |
PURPOSE:To apply reset to a flip-flop circuit, by connecting a diode in parallel to a resistor of a time constant circuit, and discharging rapidly a charging voltage of a capacitor at the momentary interruption of power supply. CONSTITUTION:An FF circuit 1' of circuit-integrated configuration consists of an FF circuit 2 and a reset circuit 3'. An output of the time constant circuit 4' comprising RC connected in series with the power supply is inputted to a comparator 5. When the power supply is turned on, the capacitor C is charged with the time constant of RC and when the voltage reaches a charging voltage Vs, a pulse 6 is outputted from the comparator 5 as a reset pulse, which resets the FF circuits 2. If there exists momentary interruption of the power supply Vc, the voltage Vc charged in the capacitor C is discharged via a diode 7 in a short time. When the capacitor C is charged by the voltage Vs at a time t1 after time T, the FF circuit is reset by the reset pulse 6. |
