| 摘要 |
PURPOSE:To make reset for power break quick, by connecting the connection point between the parallel circuit consisting of a capacitor and a resistance and a resistance to the connection point between another resistance and capacitor through a diode and by applying power to respective series circuits. CONSTITUTION:At the application time of power supply, capacitor C is charged through resistance R3 slowly because diode D is biased backward initially; and when the charge reaches a prescribed value, Schmitt circuit 1 operates to release reset. After that, diode D is biased forward, and the potential at point (a) is converged to steady state potential V determined by resistances R1, R2 and R5. At the power break time, since electric charge of capacitor C4 is larger than that of capcitor C5, diode D is biased forward, and charge of capacitor C5 is discharged through resistance R2, an Schmitt circuit 1 is turned off to reset the circuit. |
