SU782135A1 - Analogue-discrete converter - Google Patents

Description

(54) ANALOG-DISCRETE CONVERTER

one

The invention relates to automation and computing and is used in systems of automatic control and pattern recognition.

An analog-to-discrete converter is known, which includes an opto-multivariable optocoupler element, an OR element, a control comparator, a trigger, and an Inhibit element Ll.

However, in those cases when the time interval lg between the instant of operation of the control comparator and the time of appearance of the leading edge of the next impulse of frequency N f is less than the constant charge time of the capacitor c ;. Where P. is the output resistance of the sawtooth source, the device does not have time to go to the desired stable state under the influence of the input signal U f if i e u u u ai where di is a unit of discrete voltage, which reduces the reliability of operation.

The purpose of the invention is to increase the reliability of the device.

This goal is achieved by the fact that an analog-to-discrete converter, containing a Yu1I element, controls

comparator, trigger and the element of the Inhibit and multi-stable optocoupler element made on the comparator, trigger, transformer, resistance, voltage, direct current, photodetector, light source, amplifying stage, linear charging device, peak detector, the first inputs of the comparators and

0 the signal input of the peak detector is connected to the bus of the reference sawtooth voltage, the input of the Trigger trigger box is connected to the bus of the reference rectangular voltage, the second input of the controlling comparator is connected to the input secondary, the prohibition of the input of the control element the ban is connected to the zapressin bus comparator output

20 of a multistable optocoupler element through a trigger is connected to the first input of the OR element, the second input of which is connected to the output of the control element Ban, output

25 of the OR element is connected to the control input of a peak detector, the output of which is through a series-connected linear charging device, an amplifier stage, a source

30 light, photodetector, constant-current resistance-voltage transducer is connected to the second input of the comparator of the multi-stable optocoupler element, the element M, the additional elements Ban, OR and the one-shot are introduced, the first one; An AND blocking input of the UNIFIED NITEP element The ban is connected to the bus of the reference voltage supply voltage, the output of the comparator control is connected to the second inlet of the element and the signal input of the additional element of the Inhibit, Stsfficyi element And through the trigger of the module is connected to the first input of the additional element the stroke of which through the one-shot is connected to the output of the additional element Prohibition, the output of the additional element OR is connected to the sigalshB4 input of the control element Prohibition.

FIG. 1 shows a structural diagram of the inventive discrete converter of FIG. 2 time diagrams for his work.

The converter includes a multi-stable optocoupler element 1, which contains a comparator 2, a trigger 3, a direct current resistance-voltage converter 4, a photodetector 5, a light source b of the optocoupler amplifier stage 7, a linear charger 8, a peak detector 9, a control element OR

10, control comparator 11, element AND 12, interdiction 13, control trigger 14, one-shot 15, additional power element OR 16, control element Disable 17.

The first inputs of the comparators 2 and 11 and the signal input of the peak detector 9 provide the reference sawtooth voltage of frequency f, the inputs of the setting of the flip-flops 3 and 14, as well as the first input of the And 12 element and the inhibitory input of the Forbid 13 tension gastrota Nf. The input signal is fed to the second input of the control comparator

11, the memory command is sent to the inhibit input of the control element Ban 17. The output of the comparator 2 is connected via trigger 3 to the first input of the element OR 10, the second input of which is connected to the output of the Ban control element IJ. Element output OR 10 connected

shake the battery of the torus 9, the output of which is connected via a series-connected linear charging device 8, an amplifier cascade 7, a light source of the optocoupler 6, a photodetector of the optocoupler 5, the resistance-voltage converter 4 is connected to the second input of the comparator 2. Control Comparator Output

11 is connected to the second input of the AND 12 element and the signal input of the Ban 13 element, the output of the AND 12 element. Through the control trigger 14, it is connected to the first input of the additional element OR 16, the second input of which is connected to the secondary element 13 output of the additional element OR 16 is connected to the signal input of the Ban 17 control element.

Analog-discrete converter works as follows.

When the input signal is less than a discrete unit,

5, the device is in the zero steady state, which is characterized by discrete values of the output voltage U, U ,. the light intensity of the light source of the optocoupler

0 and the time shift, the output pulse sequence relative to the reference (section O - a in Fig. 2)

When the input voltage x) is exceeded d U-, in FIG. 2

5, this corresponds to the U curve in the 0-ac region, the comparator 11 compares the reference saw-tooth voltage with the value of the input signal VJ. At the time of comparing these values, a pulse U, is generated at the output of block 11, which passes through the element 12 And (at its second, at this moment, the enabling pulse comes from the reference source

5 square voltage frequency Nf) at the input to the installation of trigger unit 14, setting the latter to one state. Trigger 14 is in this state until the arrival of

The forward front of the nearest rectangular reference voltage U, which transfers it to the zero state, as a result of which a pulse is generated. and, In the absence of commands to memorize the impulse U.

5 through the blocks 16,17,10, goes to the control input of the block 9, the key of which is for the duration of the impulse and,

is in a closed state.

In this case, the voltage J on the capacitor C of the peak detector monitors the value of the sawtooth voltage and (in Fig. 2, section a of the broken Uc). This voltage, passed through a matching amplifier, will cause the illumination of the light source of the optocoupler, and teVicaMbW voltage values feedback from the second input of block 2, within a discrete unit.

At a constant value of U at. The moment corresponding to point a, the key of the block 9 is opened and the capacitor C of this block is charged from the block

5 8, as a result of which the voltage U increases linearly (section (a, - b of the broken line and, Fig. 2). When Uy "Const, the voltage U .. in: the next period, the frequency f (part AB) increases ( plot b - bu and is compared on voltage comparator 2 with, and Hto d), as a result, trigger 3 is firing into one state. The latter is in this state until the next leading edge of the next pulse arrives and ... (corresponding to point 6) at the same time, a pulse is formed, and through which the block 10 enters the control input of the key of block 9, which leads to a change in the value I. (Participant b (r - element 1 is set in the corresponding state. When U is increased by an amount greater than the unit of discreteness AU, the process is such that the time dT corresponds to the interval b L b between; moment of comparison Uy and and corresponds to point b and front front of the nearest pulse Uj, -. (corresponds to point bj) is less than the charging time of capacitor tj. The pulse U generated by block 11 at the time of comparison does not pass through element 12 to block 14, since the first input of element 12 there is a proper voltage corresponding to the pauses pulse sequences and do ,. and passes through the element 13 (the prohibitory input of which at the same moment receives the same zero voltage corresponding to the sequence pause) to the one-shot 15. This starts the one-shot. The duration of its output pulses C is selected from the condition. where At is a unit of discreteness by the time of a multi-stable element. By generating a single pulse 15 Ts through the blocks 16, 17, 10, it arrives at the control input of the key of the peak detector 9, as a result of which the latter is closed. With r3c, the voltage Uc of unit 9 monitors and "(part b of the voltage" since during the time T of the pulse existence and the capacitor of unit 9 has time to charge. To the corresponding voltage value from the reference sawtooth source. point bd, the key of block 9 is disconnected and the capacitor C of this block is recharged from block 8, as a result of which the voltage Uc rises linearly (section C,). When the control circuit of multi-stable element 1 is opened, for example, when a memory command is given, in the same period of frequency f, element 1 will work out a new state, and the voltage of the variable voltage varies along the ideal broken line Cj-d d. ... Thus, the introduction of blocks 12, 13, 15, 16 allows the charge of the capacitor C to be measured out 9 at critical moments. When a command to memorize is sent to block 17, the device is in a steady state, which occurred before the arrival of this command, throughout its existence, regardless of the magnitude of the input electrical signal V. Section B - C and further (Fig. 2) illustrates the operation of the device in the memory mode. Thus, the introduction of new units 12, 13, 15 16 and corresponding links allows to increase the reliability of the device. The formula of the invention Analog-discrete converter containing an OR element, controlling a comparator, a trigger, and a Ban element, an optocoupler for multi-stability, an element made on a comparator, a trigger, a DC resistance-voltage converter, a photodetector, a light source, an amplifier stage, a linear line, a linear receiver, a linear receiver, a linear receiver, a photodetector, a light source, an amplifier stage, a linear voltage detector, a linear receiver, a linear voltage detector peak detector — the first inputs of the comparators and the signal input of the peak detector are connected to the reference ramp bus, the input to the zero point of each trigger is inyon with the bus of the rectangular voltage, the second input of the controller; the comparator is central with the input bus; the electrical input of the control of its element; The ban is connected to the compression bus; control output. Inhibit element Prohibit, the output of the OR element is connected to the controls of the input of the peak detector, the output of which through a linearly connected linear charging device, amplifies the body of the cascade, the light source, the photodetector, and the DC resistance-voltage converter is connected to the second center KOiitnapaTopa an optronically multi-stable element, that is, so that, in order to increase reliability, I elements are introduced, additional elements Ban, SH and one-vibrator, the first input of the element A and the prohibiting input An additional element of the Inhibit is connected to the bus of the reference rectangular voltage, the output of the control comparator is connected to the second input of the element And and the signal input cm dopol;

the element carrier is an apret; the output of the AND element is through a control trigger connected to the first input of the additional element OR, the second input. which through one “ovibram” is connected to the output of an additional element. Ban ; B1; lod additional eleyyyyg OR connected to the signal

Uim fff w jf

rvni

control element

Sources of information taken by Boi attention during examination 1. USSR Copyright Certificate No. 2477025/21, 18.04.77. (prototype).

i4iaSf: i; i, -eKKi ri: ...

Claims (1)

Claim An analog-discrete converter25 containing an OR element, a controlling comparator, trigger and element '. A ban, a multistable optocoupler element, made on a comparator, trigger, resistance-to-DC converter, a photodetector, a light source, an amplifier stage, a linear charger, peak detector, wherein the first inputs of the comparators and the signal input of the peak detector are connected to the reference ramp bus, the zero input of each trigger is connected to the reference bus rectangular voltage, the second input of the control Comparator is in the middle with the input bus О prohibiting input of the control element The ban is connected to the memory bus, the output of the comparator of the optocoupler multistable element is connected via a trigger 45 to the first input of the OR element, the second input of which is connected to the control output. The prohibition element, the output of the OR element is connected to the control input of the peak detector, the output of which is through a series-connected linear charger, an amplifying cascade, a light source, a photodetector, and a DC-DC converter connected to the second input of the comparator of an optocoupler multistable element, Including that, in order to increase reliability, the AND elements, additional elements Prohibition, OR and a one-shot, are introduced, with 4G the first input of the And element and prohibiting stroke prohibition additional element is connected to the reference rectangular bus voltage, output control comparator coupled to a second input 65 AND elements and signal input additional; body element Prohibition · *, the output of the AND element through the control trigger ’is connected to the first input of the additional OR element, the second input. which, through a single-shot, is connected to the output of the additional blocking element, the output of the additional element OR is connected to the signal input of the blocking control element.