SU1247763A1 - Scale-type voltage indicator - Google Patents

Abstract

This invention relates to electrical measuring technology. The purpose of the invention is to improve the accuracy of the device, expanding its functionality by ensuring that the measurement result is memorized. For this purpose, a device containing a amplitude-time converter 1, a generator of 3 pulses, a power source 16, a light-emitting scale 6, a trigger 2, and AND-HE elements 4.5. A | into the light-emitting scale consisting of limiting resistors 13, 14 and and successively optically coupled cells 7. h 9 JN each of which includes a photo thyristor 8, an LED 9, an indicator LED 10, a triggering LED 15 is inserted, and in each cell an additional Photo-thyristor 12, additional LED 11. On a light-emitting scale 6, a moving light spot will be observed, the speed of movement of which, and consequently, the accuracy of measuring the input voltage, will depend on the pulse duration generator 3 and does not depend on the response time of the cells of the light-emitting scale 6.- The first resistor 13 is necessary to set the operating current of the cells of the light-emitting scale 6. The second resistor 14 - to set the working current of the triggering LED 15. 1 Il. i (Л С

Description

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The invention relates to electrical measuring equipment.

The purpose of the invention is to increase the reliability, accuracy of the device, as well as expand its functional capabilities by ensuring that the measurement result is memorized.

The drawing shows a functional diagram.

The indicator contains an amplitude-time converter (AVP), the input of which is connected to the input bus, the indicator a, trigger 2, the installation input to the unit of which is connected to the output of the converter 1, the counting input - to the output of the generator 3 pulses, the direct output to the first the input of the first element IS-NOT 4, the inverse output to the first input of the second element AND-NOT 5, the second inputs of the elements AND-NO 4 and 5 are connected to the output of the transducer 1, and the light-emitting scale 6, There are 7,, 1 ..., 7 J cells each of which is on It detects a photo thyristor 8, a LED 9, an indicator LED 10, an additional LED 11 and an additional photo thyristor 12, as well as the first 13 and second 14 limiting resistors that trigger the LED 15 and the power supply 16, and the cathode of the LED 15 is connected to the output of the converter 1 and the anode to the source 16 through the resistor 14, the cathodes of the photothyristors 8 of the odd cells 7 are connected to the output of the element AND-HE 4, and the cathodes of the photothyristors 8 of the even cells 7 are connected to the output of the element IS-NOT, the cathodes of the photothyristors 12, are connected to the output of the converter l 1 ano The photothyristors 8 and 12 of each cell are combined both through the LEDs 11, 9, and 10, connected in series and according to, as well as through a resistor 13, to the source 16, the photothyristor 8 of the first cell 7 being optically connected to the LED 15, and the photothyristors 8 each the subsequent cell 7 is optically coupled to the LED 9 of the previous one, the photo thyristors 12 of each cell 7 are optically coupled to the light emitters 11 of the same cell.

The device works as follows.

At the initial time, trigger 2 is in a single state 247763 .2

The SRI due to the fact that from the output of WUA 1 to the installation input of the trigger, a low level of positive potential is applied, i.e. on the go

de flip-flop is present logical 1, and on the inverse output - logical- 0. Logical O

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ten

ts

20

25

thirty

from the output of the WUA 1 is fed to the cathode of the triggering LED 15 and to the second inputs of the elements AND-HE 4 and 5, as a result of which the outputs of the elements AND-HE 4, 5 contain logical 1, which hold the photo thyristors 8 cells 7-7 of the emitting scale 6 in the reverse biased state. The photothyristors 12 are in a non-conducting state, since the additional LEDs 1 1 of cells 7-7 do not emit light. Thus, in the initial state, the cells of the light-emitting scale 6 are not excited, and the firing LED 15 emits light to the photo thyristor 8 of the first cell 7,

A voltage is applied to the input of the bargraph indicator. WUA 1 converts the amplitude of a given voltage into a time interval represented as the duration of the presence of logic 1 at the WUA output, and supplies it to the setup input of trigger 2, as well as to the cathode of the LED triggering Yes 15 and Cathodes of the photothyristor 12. The starting LED 6 is quenched ,

35 and phototrustor 8 first cell 7,

becomes conductive. The indicator LED 10 cells 7, emits light due to the fact that at the inputs of the element AND NOT 4 there are

 logical 1, which leads to the appearance of a logical O at its output and at the cathodes of photo thyristors 8 of all odd cells 7, 7,.,., 7 ,,. The counting input of trigger 2 from the output of generator 3 receives pulses of positive polarity.

With the arrival of the first pulse at the counting input of trigger 2, it is thrown into the zero state, at the inputs

50 AND-NOT elements 5 there are logical 1, which leads to the appearance of logical O at its output. At the output of the element AND-NOT 4, logical 1 appears. The photothyristists 8 second

55 cells 7 goes to the conducting state, since an optical signal from the LED 9 of the first cell 7 is supplied to it, and the photo thyristor 8 of the first cell 7 goes to the reverse-biased state, i.e. The indicator LED 10 of the second cell 7 emits light, and the indicator LED 10 of the first cell 7 does not radiate. five

With the arrival of the second pulse, a third cell 7 of the light-emitting scale 6 is excited at the counting input of trigger -2, and the second cell 7 is quenched.

With the arrival of the third impulse, the invert cell 7 is excited, and the third cell 7 is extinguished.

If, prior to the arrival of the fourth pulse, the counting input of trigger 2 from generator 3 at the output of AWP 1 appears to be 15 seconds O, then the fourth 7 of the light intensity of scale 6 is in the excited state, since the additional LED 11 of this cell emits light an additional photo-thyristor 12 on the arrival of a logical o on the cathode of this photo-thyristor 12, and it goes into a conducting state.

Thus, at the end of the time interval at the output of WUA 1, the displayed information is memorized.

With the appearance of a new variable interval at the output of the WUA 1, all those 7 J 7, ..., 7 of the light-emitting scale 6 are extinguished, and the triggering LED 15 is energized, after which, with the arrival of pulses at the counting input of trigger 2, the described processes repeat 35 ryuts.

A moving light spot is observed on a light-emitting scale 6, the speed of movement of which, and consequently, the measurement accuracy of the input voltage, depends on the pulse period from the output of the generator 3 and does not depend on the response time of the cells of the light-emitting scale 6.45

The first resistor 13 is required to set the operating current of the cells of the light-emitting scale 6, and the second resistor 14 - to set the operating current of the triggering LED 15. 50

Claims (1)

Invention Formula Voltage bar indicator containing amplitude-time transducer Order 4i18 / 43; Circulation 728 Subscription. Manu-podigr. pr-tie, Uzhgorod, st. Design, 4. a generator whose input is connected to the input bus of the indicator, a light emitting scale consisting of N consecutive optically coupled cells, each of the cells includes in series and according to the connected photo thyristor, an LED and an indication LED that triggers an LED optically connected with the photo thyristor the first cell, the photothyristors of each subsequent cell are optically coupled to the LEDs of the previous cell, a pulse generator, two limiting resistors, and a power source, characterized in that With increased reliability, accuracy and enhanced functionality by ensuring that the measurement result is memorized, a trigger, two AND-NOT elements, N additional LEDs and N additional photo thyristors are introduced into it, the input of the unit to the trigger unit is connected to the output of the time-amplitude Converter, the counting the input is to the pulse generator output, the direct output is to the first input of the first NAND element, the inverse output is to the first input of the second NAND element, the second inputs of the NI elements are connected to the amplitude outputs A single-time converter, the cathode of the triggering LED is connected to the output of the amplitude-time converter, and the anode to the power supply through the second resistor; An additional LED, connected to the cell, the main LED and the indicator LED of the same cell, as well as the first resistor connected to the power supply terminal, are connected in series and according to Yelnia otrtiristory imparted to the cell nodes are connected to the anodes basis photothyristors these cells Kato - to the output of the amplitude-time converter, and are connected optically in additional si -s these same cells.