SU375785A1 - NUMBER-PULSE FUNCTIONAL! at - Google Patents

Description

one

The invention relates to the field of measurement technology and can be useful in the construction of frequency-digital devices and automatic control systems when working with various frequency sensors.

A number-pulse functional converter is known that contains summing and reversing counters, the inputs of which are connected via switches to the input terminals of the converter, the key control unit and the controlled frequency divider.

The purpose of the invention is to create a functional converter that is fairly simple and universal, and allows working with sensors having different non-linear dependencies that can be described with a sufficient degree of accuracy by a second-degree polynomial.

The goal is achieved in that the device contains parallel census keys and a memory register, the outputs of which through parallel census keys are connected to the inputs of the corresponding counters, and the input of the key management unit is connected to one of the input terminals of the converter via a controlled frequency divider.

FIG. 1 shows the device; in fig. 2 - his transformative characteristic.

The device consists of a summing account CHIK pulses / with indication of reversing

pulse counter 2 with coincidence circuit 3 for detecting the zero state of the counter, memory registers 4 and 5, correction factor codes with the parallel census keys 6 W. 7 into counters controlled by the engine for "5 s and the control unit 9 s keys 10-12.

The number-impulse functional converter works as follows.

Frequency / s is fed to input A and B / frequency from the frequency sensors to input B. Before starting the measurement of the signal from the control unit 9, the codes of the correction coefficients are written into the counters and using the keys of the parallel census 6 and 7, opens the key 10 of the summing input of the reversing pulse counter 2 for the time T,

defined as - and as a result in the invoice

the chic is written down the code of the number

/ Hp ± / 1 - // 1

L,

L

where n is the division ratio of the controlled

divider

At the end of the period TI, the key W is closed and the keys // and 12 are opened for the time being

TZ determined by the time required for

resetting the pulse counter 2

frequency fz. At the moment of zeroing of the reverse pulse counter 2, the pulse from circuit 3 enters the control unit and closes the keys // AND 12. Over time, the reverse pulse counter 2 through the key // receives Nz pulses with frequency fj.

N, 4- / 2/2

and taking into account the previously recorded NO code, the code of the number NZ is recorded in the summing counter / NZ, which in general terms can be represented as

N, - n + - Nii ±: N ,.

/ 2Л

If Accept frequency f2 const, then the expression can be written as

N, k, .f, ± k, f. ± N ,,

where Ki and Kz are constant coefficients. If we assume that / i const, then the expression can be written as

N, k ,,,

/ 2

OR

L, 2 ± k, T, ± N ,,

where TZ is the period of frequency f,

KI and / (2 constant coefficients. The coefficients n, and Lo are easily calculated for a specific sensor using three known points of the measured parameter by accurately measuring the sensor frequencies at these points — and composing a system of three equations of the form and its solution,.

/ ,,

/ 2 / ij

where Xi-measurable parameter.

The principle of the number-pulse function converter is explained in FIG. 2. Its essence lies in the choice of coefficients, which provide non-linear conversion of a digital measuring device, whose characteristic is mirrored to the characteristics of the measuring sensor relative to the frequency axis.

FIG. 2, and the case is shown when the output measured parameter of the sensor is frequency, and FIG. 2.6 shows the case when the output measured parameter of the sensor is the period T.

Subject invention

A number-pulse functional converter containing summing and reversing counters, the inputs of which through the keys are connected to the input terminals of the converter; , a key management unit and a controlled frequency divider, characterized in that, in order to expand the functionality of the converter, it contains parallel census keys and memory registers, the outputs of which are connected to the inputs of the corresponding counters through parallel census keys and the input of the key management unit through a controlled frequency divider connected to one of the input terminals of the converter.

/ V

Have

fig