SU1614098A1 - Device for automatic tuning of oscillation circuit - Google Patents

Description

The invention relates to a pulse technique and can be used for the formation of highly stable time intervals in the equipment of automation, telemechanics measurement technology. The aim of the invention is to increase the stability of the duration of the output pulse. The single-oscillator contains a logical element 2I-NOT 1, an analog key element 2, a timing element 3. consisting of resistors 4.5 and capacitors 6 and 7, a voltage comparator 8, a voltage divider 9, made on resistors 10 and 11. The divider 9 provides the setting of the initial voltage on inputs of the comparator, bringing it to a steady state, which excludes the possibility of its operation from various kinds of interference. 2 hp ff. 2 Il.

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1614099 A1

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The invention relates to a pulse technique and can be used for the formation of highly stable time intervals in the equipment of automation, remote control, measuring equipment, etc.

The purpose of the invention is to increase the stability of the duration of the output pulse.

FIG. 1 shows a one-shot circuit; in fig. 2 - stress diagrams.

The single-oscillator contains a logical element 2I-NOT 1, one input of which is connected to the input bus, and the output is connected to the control input of an analog key element 2 that commutes the supply voltage E to the diagonal of the bridge timing element 3 consisting of resistors 4 and 5 and capacitors 6 and 7 The second end of the diagonal is connected to the common bus. Another diagonal bridge timing element 3 is connected to the inputs of the comparator 8 voltage, the output of which is connected to the second input element 2I-NOT 1 and is the output of the device. At the point of connection of the diagonal of the bridge timing element 3 with the analog key element 2 is included resistor voltage divider 9. consisting of resistors 10 and 11.

The device works as follows.

In the initial state at the output of the element 2I-NOT set to "0". Analog key element 2 has a high impedance.

At the output of the comparator 8 is set to "1", since the voltage at its non-inversion is _with

the main entrance and? more,

than non-inverting i-yu.

With the arrival of the trigger pulse, the output of element 2I-NOT is set to "1", which takes the analog key element 2 from a state with high impedance to a state with low impedance. The diagonal of the bridge timing element 3 is supplied with a supply voltage El. The voltage at the non-inverting input of the comparator uG = En - ® to non-inverting ,, + En '* 1 1

the same remains the same = = +

Capacitors 6 and 7 under the influence of voltage El. begin to recharge. At the output of the comparator is set to "O". From this moment begins the count of the formed interval.

When the voltage at the inverting input at the non-inverting input of the comparator 8 is exceeded, the comparator 8 switches to the state in which its output is set to "G. This signal sets the element 214-HE 1 to its original state, the analog key element 2 changes to the high-impedance state. C This moment the restoration of the scheme begins.

The value of the duration of the output pulse is determined from the expression:

t.-yashgo-d ^).

where K, C - time-running resistors 4 and 5 and capacitors 6 and 7, and 84 = 8 5, Sat = * C7.

Thus, the dependence of T _p on the supply voltage El and on the instability of the initial voltage Tsvp ° a is excluded. As a result, the sensitivity of the circuit to noise across the power supply bus and to the instability of the supply voltage E is reduced, and the temperature stability is improved by eliminating the effect of the saturation voltage of the output transistor of the 214-HE element on temperature.

Using the voltage divider 9, the initial voltage is set at the inputs of the comparator, leading it to the required steady state, which eliminates the possibility of its triggering from various kinds of interference.

Claims (3)

Claim 1. A one-vibration device containing a logical element 2I-NOT, one of the inputs of which is connected to the input bus, a voltage comparator, the output of which is connected to another input of the logic element 214-HE and a bridge timing element, one diagonal of which is connected between the comparator comparison inputs, differing in . that, in order to increase the stability of the duration of the output pool. An analog key element is introduced in the outer, the other diagonal of the bridge timing element is connected to the common bus and via the analog key element to the power supply bus, and the control input of the analog key element is connected to the output of the logic element 214-HE. 2. Single-shot pop.1, characterized in that a symmetrical bridge timing element is used as a bridge timing element. five 1614099 6 3. Single-shot pop. 1, which is distinguished by the fact that, in order to increase the noise immunity of the device, a resistive voltage divider was introduced into it, connected between the power supply bus and the common bus, the midpoint of the voltage divider is connected to an analog key element.