SU1732444A2 - Converter of length of periodic pulse signals - Google Patents

Abstract

The invention relates to a pulse technique. The device contains a differentiator 1, RS-flip-flops 2, 3, filters 4. 5, low frequencies, odnovybrator 6, integrators 7. 8, comparators 9. 10. input bus 11, output tires 12, 13. 2 Il.

Description

(L

WITH

1

v |

CJ

go

J

N. &.

 hO

The invention relates to a pulse technique, can be used in the processing systems of pulse signals and is an improvement of the known device according to the authors. St. No. 1370747,

The purpose of the invention is to expand the functionality by ensuring the formation of pulses whose duration is inversely proportional to the duration of the input pulses.

FIG. 1 shows an electrical functional diagram of the device; in fig. 2 - timing diagrams for the operation of the device.

The device contains differentiator 1, RS-flip-flops 2 and 3. Low-pass filters 4 and 5, one-shot b, integrators 7 and 8, comparators 9 and 10, input bus 11 and output buses 12 and 13, with bus 11 connected to the inputs of differentiator 1 lowpass filter 4 and a single vibrator 6, the output of which is connected via the lowpass filter 5 to the first input of the comparator 10 and the input of the integrator 7, the control input of which is connected to the bus 12 and the output of the trigger 2, and the output to the first input of the comparator 9, the second the input of which is connected to the input of the integrator 8 and the output of the filter 4 Others are connected to the R-input of trigger 2, the S-input of which is connected to the output of differentiator 1 and S-input of the trigger 3, the R-input of which is connected to the output of comparator 10, and the output to bus 13, and a control input of the integrator 8, the output of which is connected to the second input of the comparator 10.

The Converter operates as follows.

In the initial state, the outputs of the flip-flops 2 and 3, on the buses 12 and 13 and the control inputs of the integrators 7 and 8, have a log. Oh, and the voltage at the outputs of the integrators 7 and 8 is zero. From the bus to the inputs of the differentiator 1, filter 4 and the one-shot 6 receives a periodic pulse signal with amplitude Vm. the duration of the TA and the period T (Fig, 2a).

A single vibrator 6 converts the input pulse signal into a signal with the same period T. with amplitude Uo and duration T0. At the output of filters 4 and 5, constant voltages U4 and Us are formed, respectively, determined by the equalities:

 y, (1)

 , (2)

where K4 and Ks are the transfer coefficients of filters 4 and 5.

The voltage LJ4 goes to the first input of the comparator 9 and to the signal input of the integrator 8, and the voltage Us from the output of the filter 5 to the first input of the comparator 10 and to the signal input of the integrator 7. Under the action of pulses from the output of differentiator 1, the flip-flops 2 and 3 are set to single state (fig. 26, 2c). These signals are sent to the control inputs of the integrators 7 and 8. The voltage level at the output of the integrator 7 increases linearly (Fig. 2d)

U7 (t) K7U5t (3)

where K is the transfer coefficient of the integrator 7;

t is the time counted from the moment the potential corresponding to Log is established at the control inputs of the integrators 7 and 8. one.

The voltage U at the output of the integrator 7 rises until it reaches the voltage level at the first input of the comparator 9. When the condition U7 (t) U4 (4) is satisfied, a pulse is generated at the output of the comparator 9, under which the trigger 2 returns to the initial state, and the integrator 7 is zero (Fig. 26, r.).

Solving jointly Eqs. (1) - (4), one can determine the duration of g of pulses at the output of trigger 2 and bus 12, if we substitute the specified duration of t into equation (3) instead of time

To KsUp Гр Т К4 Urn Щ, / М Urn T u

T t OR t ,, ,,. i.

TC KS UQ TO

(four)

It can be seen from the obtained equation that the duration t of pulses on bus 12 does not depend on the period T of the following pulses, it is directly proportional to the duration m of the input pulses, and the proportionality coefficient can be easily changed over a wide range by a corresponding change in the transfer coefficient K of the integrator 7 when constant coefficients and Ks, amplitudes Um and Uo and duration To.

The voltage at the output of the integrator 8 and at the second input of the comparator 10 under the action of the input to the signal input of the integrator 8 increases linearly (Fig. 2e) according to the law

Us (t) KaU4t, (5)

where Kv is the integrator transfer coefficient 8.

When the condition U8 (t) U5 (6)

at the output of the comparator 10, a pulse is formed, under the action of which the RS-trigger 3 returns to the initial state, and the integrator 8 is zeroed out (Fig. 2c, e).

Solving equations (1), (2), (5) and (6) together, you can determine the duration g of pulses at the output of the trigger 3 and bus 13, if you enter the specified duration that Kv Kd Um HzT KsUprp instead of time t in equation (5)

Tt

or

 / KsUpTp „

KeK4Umru-V

It can be seen from equation (7) that the duration g of pulses on bus 13 does not depend on the period T of the following pulses, it is inversely proportional to the duration of the input pulses, and the proportionality coefficient can easily be varied over a wide range by a corresponding change in the transfer coefficient Ka of the integrator 8 at constant coefficients IGj Ks, amplitudes Dm, Uo, and duration TQ.

Thus, the proposed converter allows realizing not only: q hrHH J,

which is directly proportional, but also about (p, which is proportional to the dependence of the duration of the output pulses on the duration of the input pulses.

Claims (1)

Invention Formula Converter duration of the periodic pulse signals according to ed. No. 1370747, characterized in that. in order to expand functional capabilities by ensuring the formation of pulses, the duration of which is inversely proportional to the duration of the input pulses, a second integrator with a reset, a second comparator, 5 second RS trigger and second output bus connected to the control input of the second integrator and output of the second trigger, the 3 input of which is connected to the output of the differentiator, and the R input to the output of the second 0 of the comparator, the first input of which is connected to the bypass of the second low-pass filter, and the second input to the output of the second integrator, the signal input of which is connected to the output of the first low-pass filter 5 frequencies. :P. AND P