Digitally-controlled monostable trigger and control method

Abstract

The invention discloses a digitally-controlled monostable trigger and a control method. The trigger comprises a trigger signal input end, an RS trigger and a digital control circuit, wherein the Q endof the RS trigger is an output end, the zero setting end of the RS trigger is connected with an RC charging and discharging circuit connected in series, and the trigger signal input end is electrically connected with a third NAND gate and the S input end of the RS trigger in sequence. The control method comprises that: a counter is used for carrying out frequency division on a clock signal so asto output pulse signals with different time lengths; the RS trigger is inverted in response to the pulse signals, the counter receives the signals, starts to work and outputs a high-level pulse aftercounting, and the monostable trigger outputs a low level, so that the monostable trigger is switched between a transient state and a stable state. The trigger is simple in structural composition, themonostable trigger can be converted between a transient state and a stable state through the control method, the pulse time of the rectangular waves is accurately controlled by setting the carry valueof the counter, and then the transient state time of the monostable trigger can be accurately controlled.

Description

technical field [0001] The present invention relates to a monostable trigger and a control method, more specifically, to a digitally controlled monostable trigger and a control method. Background technique [0002] The monostable flip-flop outputs a low-level trigger signal, which makes the monostable flip-flop switch from a steady state to a transient state. In the ordinary monostable flip-flop circuit, the resistor-capacitance circuit (Resistor-Capacitance circuit, RC) is used to charge and discharge, the voltage across the capacitor and the resistor changes gradually, and the NAND gate at the output port of the monostable flip-flop circuit is affected by When the voltage influence exceeds the threshold value, the state of the monostable flip-flop circuit returns to a steady state from a transient state. The transient time is determined by the time constant of the RC charging and discharging circuit. The time constant is the product of the resistance value and the capacit...

AI Technical Summary

Problems solved by technology

Although adjustable resistors and adjustable capacitors can be used in the circuit, the resistance value and capacitance value can be changed by rotating the adjustment port on the resistance-capacitance element, and the time constant can be changed, thereby changing the transient time. However, adjusting the transient time by rotating the adjustment port is relatively Extensive, not conducive to precise control

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