SU669481A1 - Pulse selector by recurrence frequency - Google Patents

Description

The invention relates to a pulse technique and can be used, for example, to control the frequency of a pulse.

Pulse selection devices for the repetition period are known, containing an element I at the n inputs, one of which is the device input, and connected in series (p-1) delay lines, the output of each of which is connected to one of the (p-1) inputs of the AND element , the input of the first delay line is connected to the input of the device, and the output of the AND element is the output of the device. The delay time of each delay line is equal to the repetition period of the selected pulses -11.

The disadvantage of the device is a decrease in the accuracy of the selection of pulses with a change in temperature conditions.

More modern is the pulse selector for the pulse repetition frequency, containing an element I, the first input of which is connected to the input of the delay line, the second input to the output of the delay line, and the delay line is placed in the thermostat 2.

The selector provides increased accuracy of pulse selection.

The disadvantage of the selector is a considerable readiness time due to the large amount of constant thermostat time.

The aim of the invention is to reduce the selector availability time by reducing the electrothermal constant of the time of the control object.

To do this, in the pulse selector with respect to the following frequency, containing an ultrasonic delay line, element I, the first input of which is connected to the input of the delay line, the second with the output of the delay line, and the temperature stabilization system of the ultrasonic delay line, the temperature stabilization system of the ultrasonic delay line contains series-connected sawtooth generator, comparator, preheating current driver, sound duct

the delay lines are 1 thermally in contact with the temperature sensor connected to the second input of the comparator and the power source.

Ma drawing shows a structural electrical diagram of the iipejuiaracMoro selector.

The pulse selector for purity of the track contains an ultrasonic magnetostriction delay line I, an input transducer

2 and the output transducer 3 are located on the conduit 4.

Transducers 2 and 3 through amplifiers 5. And 6 are connected to the inputs of element 7. The ultrasonic temperature stabilization system of the delay line consists of a series-connected sawtooth generator 8, a comparator 9, a current driver 10, a power source 11, and a temperature sensor 12, shchagos in thermal contact with the sound pipe 4 delay lines 1 and comparator pushed to the second input 9.

The pulse selector for the following frequency works as follows.

The input pulses are fed to the shaper 5 of the input pulses, which generates current pulses that are converted by the input transducer 2 into ultrasonic oscillations of the acoustic duct. Output signals of the delay line from the output converters

3 are fed through amplifier 6 to the input of element 7. The delay time is equal to the period of the selected pulses, and therefore, when the input pulses of the device follow with a predetermined period, a signal appears at the output of element AND 7. A constant delay time when the conditions of application change is provided by heating of the sound duct 4 delay lines to a constant TCMnepaiypbi.

When the duct temperature deviates from the preset temperature sensor 12 produces a voltage that is compared by the comparator 9 with sawtooth pulses coming from the saw voltage generator 8. The duty cycle of the output pulses of the comparator 9 uniquely corresponds to the deviation of the temperature of the sound duct from the specified one.

The current pulses, heating the sound duct, are produced by the power source 11, with the help of the driver 10 heat current pulses. Temperature control accuracy

the acoustic ducts, and, accordingly, the delay time, is achieved by selecting the optimum characteristic of the sensor 12 for the deviation of the sound temperature from the specified one. Since the proposed device makes it possible to significantly reduce the electrocution constant of the time of the object to be regulated, this allows reducing the availability time of the pulse selection device itself over the period

repetition.

Tests in the temperature range from -55 ° C to + 60 ° C using the stabilization system described above show that the readiness of the selecdium device decreases by a factor of 3-4 in fats with known devices using thermostats. At the same time, the power consumption for stabilizing the temperature of the sound pipes of the delay line is significantly reduced.

Claims (2)

Invention Formula A pulse rate selector with an ultrasonic delay line, And element, the first input of which is connected to the input of the delay line, the second one - with the output of the delay line, and the system for stabilizing the temperature of the ultrasonic delay line, in order to reduce the availability time of the selector by reducing the electrothermal constant time of the control object the temperature of the delay line contains a series-connected saw-tooth voltage generator, a comparator, a current pulse shaper of heating, a sound pipe; delay wires, which are in heat ohm contact with the temperature sensor connected to the second input of the comparator, and a source nutrition Sources of information taken into account in the examination I. Maksimov M. V. Protection against radio interference. M., Sov.radio, 1976, p. 341 2. Timihov about. N., Lyubchenko V.K. Pulse selectors. M., Sov.radio, 1966, p. 45.