SU951676A1 - Delay device - Google Patents

Description

(5) DELAY DEVICE

The invention relates to a pulse technique and can be used in the construction of pulse generators, as well as for delaying pulse signals in automation and telemechanics devices. Delay devices are known that contain an integrating RC circuit and a threshold stage Oi f2J. A common drawback of the known delay devices is their low accuracy. The closest technical solution to this invention is a pulse delay device containing an integrating RC circuit and a rectifier element connected in parallel to the capacitor of the integrating circuit 2.. This device has low reproducing accuracy of the delayed pulse duration and the delay interval due to the influence of the residual charge on the capacitor, the time of the driving RC circuit and the hysteresis properties of the threshold element. The purpose of the invention is to improve accuracy. The goal is achieved in that a delay element and an additional threshold element connected in parallel to said threshold element are inserted into a delay device containing an integrating RC circuit, an additional threshold element connected counter-parallel to said threshold element, and the integrating RC circuit is connected between an input signal bus and a trigger output controlled by 1 output signals of the threshold elements. The drawing shows a circuit diagram of the proposed device. The device contains a trigger 1, having an input 2 and outputs 3 and A, which integrates an RC circuit 5, consisting of a resistor 6 and a capacitor 7, connected 3. 9 valuable to the bus 8 connected to the source 9 of the input signal through the resistor 10, and two regenerative threshold elements connected in parallel to the capacitor 7 and connected to each other in parallel to each other, made on transistors 11 and 12, respectively, with a common collector winding 13, emitter winding the positive feedback of the transformer 15, the business; l voltage on two series-connected zener diodes 16 and 17 connected by one output to the bases of transistors 11. and 12, and the other output to the input signal bus 8, and the output winding 18 of the transformer 15 connected to the input 2 of the trigger 1. At the same time, the emitter winding 1L is connected to the output of the integrating RC circuit 5, the resistor 6 of which is connected to the zero output 4 of the trigger supplied from a separate voltage source 19, and the capacitor 7 to bus 8 connected to input source 9 (through resistor 10).

The device works as follows.

In the initial state at the output k of the trigger 1, the voltage is zero and the capacitor 5 is de-energized.

When the input voltage comes from source 9, the capacitor 7 of the integrating circuit 5 begins to charge through the resistor 6 and the low output resistance of the trigger 1.

When the voltage across the capacitor 7 reaches the threshold of the threshold element performed on the transistor 11, determined by the voltage across the Zener diode 16, a blocking process occurs and a negative pulse is generated at the output winding 18 of the transformer 15. Trigger 1 is transferred to the second a steady state in which high potential is present at the turn. Under the action of a high potential at the output 4 of the trigger 1, the capacitor 7 is recharged across the circuit: resistor 10, - SOURCE 9 input voltage, source 19 of the trigger supply voltage, load trigger resistor of the trigger, corresponding to output k, and 6 o resistor 7 goes through zero and changes

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sign. When the input voltage is removed, the state of the trigger does not change, the process of recharging the capacitor 7 through the internal resistance of the source 9, the voltage of the input signal continues.

When the magnitude of the voltage on the capacitor 7, rushing to the value of the voltage of the trigger power supply source 19, reaches the threshold of the threshold element performed on the transistor 12 determined by the voltage of the breakdown of the zener diode 17, the blocking process also occurs on the output winding 18 of the transformer 15 a positive impulse is formed, causing reverse flip-flop of trigger 1. Trigger 1 switches. in a state that corresponds to, zero potential at output 4, capacitor 7 is discharged, the device returns to its output th state.

The execution of a resistor 6 by a two-section, consisting of two resistors, shunted by counter-connected diodes, allows independent adjustment of the delay of the front and rear edges of the output pulse.

The advantage of the proposed delay device is high

the accuracy of the formed delay intervals and the duration of the output pulse, the switching nature of the switching -threshold elements and the high steepness of the voltage rise on

the capacitor due to the process of recharging the capacitor t by changing the polarity of the voltage across the capacitor.

Claims (2)

Invention Formula A pulse delay device containing an integrating KS circuit, a threshold element connected in parallel to an integrating circuit capacitor, characterized in that, in order to increase accuracy, a trigger is introduced into it and an additional threshold element connected counter-parallel to said threshold element, we take an integrating RC -the chain is connected between the input signal bus and the trigger output, up59516766 equal to the output signals nopo-i 1. USSR authorship beef elements.№ 377963, class. H03 K B / O, 1970. Sources of information, No. 00997, CL. I03 K 5/13, 1971 taken into account in examination 5 (prototype). -.015 one one 2. USSR author's testimony n + 10O,  R