SU1667113A1 - Differentiating device - Google Patents

Abstract

The invention relates to a measurement technique and can be used in measurement and automatic control systems. The purpose of the invention is to improve the accuracy of the device. The device contains a sawtooth voltage generator 1, a comparison unit 2, a pulse distributor 3, delay elements 4, 5, element OR 6, elements AND 10, 13, 14, BAN elements 11, 12, RS - triggers 15, 16, demodulators 7 , 8, block 9 subtraction. The principle of operation of the device lies in the fact that in the case of non-simultaneous arrival of pulses at the direct inputs of the first and second elements. Elements 4 and 5 have a delay time equal to the period of the sawtooth voltage from the output of the generator 1. 2 Il.

Description

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The invention relates to a measurement technique and can be used in measurement and automatic control systems.

The purpose of the invention is to improve the accuracy of the device.

FIG. 1 shows a functional diagram of the proposed device; in fig. 2 - time diagrams of his work.

The device contains a sawtooth voltage generator 1, a comparison unit 2, a pulse distributor 3, the first and second delay elements 4, 5, the OR element 6, the first and second demodulators 7, 8, the subtractor 9, the first element AND 10, the first and second the elements of the prohibition 11,12, the second and third elements And 13, 14, the first and second RS-triggers 15, 16.

The device works as follows.

In the initial state, when the signal at the input of the device has a constant value, for example, equal to zero, the voltage at the second input of the comparison unit 2 is zero, and its saw input voltage from the generator 1 is applied. At the moment of equal voltage, at both inputs of the comparison unit 2, the signals are equal to each other, and at its output a pulse signal appears, which is fed to the direct input of the BANNER element 12 and to the distributor 3 pulses, from the output of which the pulses are alternately fed to the delay elements 4, 5 per od signal generator 1, from which output pulse signals through element 6 and IL are supplied to the inverted input of the forward member 11.

If the signal at the input of the device has a constant value, the pulse signals from the output of the comparison unit 2 coincide in time with the pulse signals from the outputs of the delay elements 4, 5 and, therefore, both inputs of the And 10 element are signals simultaneously, resulting in is a signal that prohibits the passage through the elements of the prohibition 11, 12 signals applied to their direct inputs. Both triggers 15,16 are in the initial (zero) state, i.e. at their output and, therefore, at the output of the entire device, the signal is zero. The elements of the device are in the same state at any other (non-zero) value of the unchangeable in time input signal.

When you change the input signal Ovh. For example, when it is increased, the voltage at the second input of block 2 of the comparison other than zero and its output does not appear when the sawtooth voltage is zero, but at a value equal to the input voltage, which causes an increase in the time intervals between output pulses

block 2. These changes in time relative to the period of the sawtooth voltage, characterizing the first derivative of the input signal, result in a delay in the output signal of the comparator 2 with respect to the signals coming from elements 4. 5 delays.

As a result of the mismatch of the signals arriving at the inputs of the first element And 10, the signal at its output is zero. Signal

from the output of the element OR 6, the passage through the element BANGE 11, enters the first input of the second element AND 13, which is in the open state, since at its second input there is a signal of a single

level from the inverse output of the second RS-trigger 16, and then the signal goes to the S-input of the first RS-trigger 15, transfer it to state 1, and to the R-input of the second RS-trigger 16, confirming its status

A. At the same time, the zero-level signal from the inverted output of the RS-flip-flop 15 is applied to the input of the element 14, prohibiting the passage of a signal through it to the S-input of the flip-flop 16.

When a signal appears at the output of the block

2 bn passes through the second element BANGE 12 and wraps the RS-flip-flop 15. remove the ban on passing the signal to the S-input of the flip-flop 16. Discrete signal from the output of the flip-flop 15

enters the input of the demodulator 7, where it is converted to an analog value, and through the subtraction unit 9 enters the output of the device. In the case of a negative derivative of the input signal, the first signals from the output of block 2 follow, and then the signals from the output of the OR 6. The second trigger 16 and demodulator 8 work in this case.

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Claims (1)

Invention Formula Differentiating device containing a pulse distributor, the first and second elements BAN, the first, second and third elements AND, the element OR, and 0, the output of the first element I is connected to the inverse input of the first element BANGE, characterized in that, in order to improve the accuracy of the device, a sawtooth generator 5, a comparison unit, the first and second delay elements, the first and second RS triggers, the first and a second demodulator and a subtractor, the output of the sawtooth generator being connected to the first input of the comparison unit, the second input which is the input of the device, and the output of the comparator unit is connected to the input of the pulse distributor, the first and second outputs of which are connected respectively via the first and second delay elements to the first and second inputs of the OR element, the output of which is connected to the forward input of the first BANNER and to the first the input of the first element And, the second input of which is connected to the output of the comparator unit and the direct input of the second element BANGE, the inverse input of which is connected to the output of the first element And, the output of the first element 3 of the PET PET connected to the first input of the second element And to the R input of the second 0 RS-flip-flop, the output of the second element BANNER is connected to the first input of the third element And and the R-input of the first RS-flip-flop. the inverse output of which is connected to the second input of the third element I, the output of which is connected to the S-input of the second RS flip-flop, the inverse output of which is connected to the second input of the second element And whose output is connected to the S-input of the first RS-flip-flop, the direct outputs of the first and the second RS flip-flops, respectively, through the first and second demodulators are connected to the first and second inputs of the subtractor, the output of which is the output of the device. UMN k k k K Cch I I I I one Jl i / I I I I I Jljl N it i I I 1 I I I I I I I I I Jl i I // I III K I I I I I I I I I I I I I I I I I I Fl p p d i FIG. g