SU1527706A1 - Single-shot vibrator - Google Patents

Abstract

The invention relates to a pulse technique and can be used in various electronic automation devices. The purpose of the invention is to improve the reliability of the one-shot. To achieve this goal, a diode 10 is inserted into the one-shot, which is connected between the non-inverting input of the comparator 5 and another output of the key element 8. In addition, the one-shot contains a resistive-capacitive bridge consisting of resistors 1–3 and a capacitor 4, the power source 6, the common bus 7, the resistor 9, the input bus 11 and the output bus 12. In this case, the duration of the trigger signal may be longer than the duration of the generated signal. 2 Il.

Description

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The invention relates to a pulse technique and can be used in various electronic devices and automation devices.

The aim of the invention is to increase the reliability of operation.

FIG. 1 is a schematic diagram of a one-shot; in fig. 2 - time diagrams of his work,

The single-oscillator contains a resistive-capacitive bridge consisting of resistors 1-3 and capacitor A, the output diagonal of which is connected to the inputs of the comparator 5, and the input diagonal - to the positive bus of the power supply 6 and the common bus 7, to which through the key element 8, the resistor 9 and the diode 10 are also connected by matching the input of the comparator gating input and the connection point of the resistor 3 and the capacitor 4 of the output diagonal of the resistive-capacitive bridge. The control input of the key element 3 is connected to the input threshold 11, the output bus 12 is connected to the output of the comparator 5 ..

The one-shot works as follows

In the initial state, when the potential at the input bus 11 is high, the key element 8 is open (Fig. 2a).

The capacitor 4 is discharged through the diode 10 and the open key element 8, and the voltage at the non-inverting input of the comparator 5 is shtse than the voltage U at its inverting input, determined by the ratio of resistors 1 and (Fig. 2b). Moreover, since the comparator is blocked at the gate input through the resistor 9 and the key element 8, a high voltage level is maintained at the output bus 12 (Fig. 2c).

At time tl, an input signal is received at the input bus 11 (Fig. 2a), through which key element 8 is locked and the lock is removed from the gate input of the comparator 5, the latter being in accordance with the voltages at its inputs (Fig. 25 ) switches to a state in which a low voltage level is present on the output bus 12

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(Fig. 2c). Simultaneously, the charge of the capacitor 4 begins. At time t2, the voltage on the capacitor 4 and, respectively, on the non-inverting input of the comparator 5 reaches the voltage level on the inverting input of the comparator (Fig. 2b), the comparator switches to the state when which on the output bus 12 again has a high voltage level. At time t3, the trigger signal is removed from the input bus 11 (FIG. 2a), the key element 8 is opened. At the same time, the capacitor 4 is quickly discharged through the diode 10 and the open key element 8 (FIG. 26), but the output bus 12 maintains a high voltage level (FIG. 2c), since the co-generator 5 is blocked at the input to the building through the resistor 9 and the open key element 8. At the time t4, the next trigger signal is supplied to the input bus 11, the processes in the circuit are repeated,

Thus, due to the introduction of a diode 10 and a change in the functional connections, the capacitance n stability of the pulses generated on the output bus 12 is determined only by the parameters of the resistive-capacitive bridge, and the duration of the trigger signal may be longer than the duration of the generated signal.

Claims (1)

Invention A one-vibration device containing a comparator, a key element and a resistive-capacitive bridge, the input diagonal of which is connected between the power supply bus and the common bus, and the output diagonal to the comparator inputs, one of the outputs of the key cell is connected to a common bus, characterized in that in order to increase the reliability of operation, a diode is inserted in it, connected between the non-inverting input of the comparator and another output of the key element, which is connected via a resistor to the input of the comparator strobe, the output cat cerned is connected to the output schinoy and upreshl yuschy input key element - the input schinoy. t FIG. 2