SU822343A1 - Telemetry frequency-to-voltage converter - Google Patents

Description

one

The invention relates to a pulse technique and is used to convert the information of a pulse Sensor to an analog signal.

A frequency-to-voltage telemetry converter is known that includes a duration driver, an amplitude normalizer, and an integrator, and the input frequency is converted into a sequence of pulses of normalized duration using a duration generator. Subsequently, the pulses are normalized in amplitude and the integrator is charged, with each pulse bringing a constant amount of electricity. The voltage across the integrating capacitor is proportional to the number of input pulses per unit time JYJ.

The disadvantage of these frequency - voltage converters is a significant error in their output characteristics due to the departure of the parameters of radio-electronic products during their aging and under the influence of external destabilizing factors, as well as its significant error in the initial part of the work due to transients due to the constant time of the integrator.

The purpose of the invention is to increase the accuracy of the telemetric frequency converter - voltage due to the reduction of errors from changes in the parameters of electrical radio equipment due to aging and under the influence of external destabilizing factors.

0

The goal is achieved by the fact that the telemetry frequency converter is a voltage containing serially connected pulse normalizers and pulse amplitudes, an integrator, an output mixer, an input and an output bus, upper and lower frequency-error generators, a clock frequency generator, and 1/1

0 calibration off, shaper start, element ZI, element 4 AND, element 2 OR, element 3 OR, and the outputs of the upper and lower calibration frequency generators are respectively connected to the first input of element 3 AND and the fourth input of element 4 AND, inverted generator output the clock frequency is connected to the second input of element 4 and, and direct 0 to the second input of element 2 OR, the output of which is connected to the second input of element 3 AND, the third inputs of elements 3 AND and 4 AND are connected to the inverse output of the calibration disabler, the output of which is connected to the input of the start-up driver, the output of which is connected to the second input of the output mixer, and the input is connected to the input signal bus, which is also connected to the third input of the OR element 3, the first and second inputs of which are connected to the output of the 2 AND and 3 AND elements and the output is with the input of the duration normalizer.

In addition, to improve accuracy by eliminating transient error, a time delay and a control trigger are introduced, the time relay input is connected to the forward clock generator clock output, the time relay direct output is connected to the control trigger S input and the inverse output of the time relay is connected to the R input of the trigger and direct output of the calibration disabler, the direct output of the control trigger is connected to the first input of the OR element 2, and the inverted output to the first input of the 4I element. information about the values of the upper and lower Ks1librovochnyh frequencies, calibration frequency generator outputs connected to separate inputs of the clock generator.

FIG. 1 is a block diagram of a converter; FIG. 2 are diagrams of the output voltage of the converter.

Telemetry Converter -.voltage - voltage consists of series-connected normalizer 1 duration, designed to convert the input signal into pulses of standard duration, normalizer 2 amplitude, designed to stabilize the amplitude of the pulses of the normalizer 1 duration, integrator 3, serving to convert sighed pulses into voltage, proportional to the number of input pulses per unit time and output mixer 4, designed to transmit chi on the output bus 5 of the signal from the integrator 3 and the imaging unit 6 start, the bus 7 input signal, the imaging unit 8 disconnecting the error, r-generator 9 and 10 calibration frequencies, oscillator 11 clock frequency, element 3 and 12, element 4 and 13, element 2 OR 14, element 3 OR 15, control trigger 16, and time relay 17.

The work of the transducer occurs next}

After power is applied to the input of the relay 17 time begin to flow

pulses from the generator 11. clock frequency. The control trigger 16 at input R is reset. A control voltage is applied to the first element 4 and 13 from the inverted output of the control trigger 16. Calibration disablement driver 8 is in the initial state, in which the permitting voltage from its inverse output goes to the third inputs of elements 3 and 12, .4 and 13. Generators 9 and 10 provide calibration frequencies to the first and second inputs of the clock, generator 11, which begins to form the time interval T for supplying the frequency f of generator 9 to the input of the measuring path.

By the duration of the calibration pulse T | recorded by the telesystem, with a constant stabilization factor 0, the output is

f frequency drift during operation. When the generator 11 generates a duration T, the resolving voltage from its direct output through 5 the second input of element 2 OR 14 is fed to the second input of element 3 AND 12:: the first input of which passes the frequency f of generator 9 to the first input of element 3 OR 15, and from it to (j input of the normalizer 1 of the measuring path length. Normalizer 1 of duration converts the frequency f into pulses of standard duration, which are limited in amplitude by normalizer 2 of amplitude, are converted into a constant voltage by the integrator 3 and h Through the first input of the mixer 4, the output bus 5 is fed to the recorder (not shown in Fig. 1) as voltage 0 Uj f (f |) for T. After the interval T has been formed, the generator 11 begins to form the feed time interval Tg frequency fg generator 10 to the input 5 of the measuring path.

According to the duration of the calibration pulse T, recorded by the telesystem, with a constant stabilization factor, it is possible to produce an analogous LIZ of frequency deviation fg during operation.

When forming the clock generator 11 duration T resolving

f is the voltage from its inverse output (there is no permit voltage at the direct output) to the second element 4 AND 13, the fourth input of which passes the frequency fg of the generator 10 to the second input of element 3 OR 15, and from it to the input of the normalizer 1 of duration measuring path. A normalizer 1 of duration converts the frequency into pulses of standard duration, which are limited in amplitude

the amplitude normalizer 2, is converted into a constant voltage by the integrator 3 and through the first input of the mixer 4 is fed through the output bus 5 to the recorder in the form of a voltage 1/2 (2 time Tg. After the formation of the interval 11 by the generator T, the generator 11 again forms , interval T, etc. After the time relay 17 triggers through time T tg t (time tj), the latter triggers the control trigger 16, which in the inverse output prevents the passage of frequency f2 through element 4 and 13 and allows the direct output through element 2 or 14 p The constant passage of the frequency f of the generator 9 into the measuring path, keeping the output voltage at the level U f (f) until the working signal arrives. With the arrival of the working signal at time t3, the calibration disabler 8 prevents the inverse output from passing the calibration frequencies f J and f2 through the first input of element 3 and 12 and through the fourth input of element 4 and 13 for the duration of the action at the input of the working signal converter. The signal from the direct output of the calibration disabler 8 returns the control trigger 16 to its initial state set and starts the generator starts working b, which through a second input of mixer 4 and the output line 5 in vschaet recorder pulse of duration t and the amplitude of U. corresponding to the beginning of the input signal to the converter. The input signal from the bus 7 through the third input element 3 OR 15 is fed to the input of the measuring path.

The measuring path forms at the output a voltage proportional to the frequency of the input signal, t, e,

Iewewt. ° f (fex.)

In this case, the time of the transient process is determined by the difference in the frequencies L i, since f corresponds to the beginning of the measured range, the time of the transient process and the error caused by it, the sum of ay; to a minimum (at fgx. f there is practically no transient).

The measurement of the input signal is made within the range determined by the failure voltage Uj | and 2 / corresponding to the calibration frequencies f | H f5, whence according to the current value of out. You can go to the value of fgx, - Since the electrical and radio components of the measuring path participated in the formation of and and 2, the errors from the departure of their pargillots and from the departure of the start of calibration are eliminated when converting the input signal. Angshoally corrected based on fixed durations T and T and the values of the calibration frequencies f- and f2, t, e.

i x U2-U, After the end of the working signal. (moment of time t), the calibration exclusion generator 8 is turned off. The signal from its inverse output allows the passage of frequencies f and f y

0 through the first input element 3 and 12 and the fourth input element 4 and 13. The signal from the inverse output of the trigger 16 controls the input to the first input element 4 and 13. Calibration

5, the frequency of the signal from the clock frequency generator 11 begins again for the time T and T2 to flow into the measuring path, calibrating it with the voltages U; f and U. Repeating the calibration reveals the departure of the parameters of the radio goods, allows an appropriate extrapolation correction the output signal of the converter during its process

5 work.

Due to the introduction of a calibration circuit into the converter, the measurement of the measuring path is carried out before and after the work is completed with two frequencies, which allows

0 to exclude the error of the output characteristic of the converter, caused by the departure of parameters of electrical radio equipment due to aging and

with under the influence of destabilizing factors and leads to a decrease in error due to the transition process in the initial part of the characteristics.

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Claims (3)

Invention Formula 1, Telemetric frequency converter - voltage containing series-connected normalizers of the duration of AND-S1PLITUDES pulses, integrator, output mixer, input and output buses, characterized in that, in order to increase accuracy by reducing errors from changes in the parameters of radio goods due to aging and under the influence of external destabilizing factors. he introduced generators top and lower calibration frequencies, clock frequency generator, calibration off driver, start operation driver, element 3 AND, element 4 AND, element 2 OR, element 3 OR, with the outputs of the generators the upper and lower calibration frequencies, respectively, are connected to the first input of element 3 I and the fourth input of element 4 and the inverse output clock generator is connected to the second input of element 4 I, and direct to the second input of element 2 OR, the output of which is connected to the second input of element 3 AND, the third inputs of elements 3 AND and 4 AND are connected to the inverse output of the calibration disabler, etc. my output is connected to the start driver input, the output of which is connected to the second input of the output mixer, and the input is connected to the input signal bus, which is connected to the third input of the OR element 3, the first and second inputs of which are connected to the outputs Sent 2 And 3 And, and the output - with the input of the normalizer duration. 2. The converter according to claim 1, characterized in that, in order to increase accuracy by eliminating errors from transients, a time relay and a control trigger are inputted to it, the time relay input being connected to the direct output of the clock frequency generator, direct the output of the time relay is connected to the S-input of the control trigger, and the inverse output of the time relay is connected to the R-input of the control trigger and the direct output of the calibration off driver, the direct output of the control trigger is connected to the first input of the OR element 2, and the inverse with the first input element 4 I. 3. The converter according to claim 1, varying in that, in order to obtain information on the values of the upper and lower calibration frequencies, the outputs of the calibration frequency generators are connected to separate inputs of the clock generator. Sources of information taken into account during the examination 1. Gorn LS, Khazanov BI Transistors in the measuring equipment. M., 1961, p. 124-130 (prototype).