SU1164656A1 - Tolerance checking device - Google Patents

Description

The invention relates to a pulse technique and can be used in instrumentation tolerance control.

A tolerance control device 5 is known, which contains operational amplifiers with differential inputs, a reference voltage source, an output amplifier and resistors, and the device input is connected via. resistors with direct inputs of the first and second operational amplifiers, the inverse inputs of which are connected to the corresponding outputs of the reference voltage source, the outputs of these operational amplifiers are connected via resistors, respectively, to the first and second inputs of the third operational amplifier, whose output is connected, via a resetter 20 to the inputs output amplifier [(1 (].

The disadvantages of this device are its low accuracy, since the comparison of the input voltage with the threshold occurs in independent channels, and its narrow functionality, since it allows you to determine whether the value of the input voltage is in or out of the tolerance field. zo

I.

The closest to the proposed is a tolerance control device containing electronic keys, a pulse generator, a voltage switchboard, a resistor, a reference voltage source, the first and second outputs of which are connected to the information inputs of the first and second electronic keys, respectively, whose control inputs are ⁴⁰ connected with inverse and direct. the outputs of the pulse generator, respectively, the output of the first electronic key is connected to the inverting input of the voltage comparator, the input is a ⁴ $ bus connected to the first output of the resistor, the third and fourth electronic switches, the control inputs of which are connected respectively to the inverse and direct outputs of the pulse generator, the second output of the resistor connected to the information inputs of the third and fourth electronic switches, the outputs of which are connected respectively to the inverse ⁵⁵ and direct inputs of the voltage comparator, the output of the second The electronic key is connected to the direct input of a voltage comparator, the output of which is through an .integrating CS circuit and an output amplifier connected to an output bus £ 2 3.

The disadvantage of this device is its narrow functionality, since it allows you to determine whether or not the value of the input voltage is in the tolerance field.

The purpose of the invention is to expand the functionality of the device by indicating all the logical possible cases of comparing the input voltage with the threshold.

This goal is achieved by the fact that the tolerance control device containing electronic keys, pulse generator, voltage comparator, resistor, reference voltage source, the first and second outputs of which are connected to the information inputs of the first and second electronic keys, respectively, the control inputs of which are connected to inverse and direct the outputs of the pulse generator, respectively, the output of the first electronic key is connected to the inverting input of the voltage comparator, the input bus, connected to the first the output of the resistor, introduced two elements AND-NOT, element 2-ЗИ-2ИЛИ-НЕ, three-stable trigger, and the inverse output of the voltage comparator is connected to the first input of the first element AND-NOT and to the first input of the first element AND element 2ЗИ-2ИЛИ-НЕ, the direct output of the voltage comparator is connected to the first input of the second element AND element 2-ZI-2IPI-NOT and to the first input of the second element NAND, and direct. the output of the pulse generator is connected to the second input of the second element AND element 2-ZI-2ILI-NOT and the second input of the first element NAND, the inverse output of the pulse generator is connected to the second input of the first element AND element 2-ZI-2ILI-NOT and the second the input of the second element N-NOT, while the output of the first element AND-NOT connected to the first input of the three-stable trigger, the output of the element 2-ZI-2ILI-NOT connected to the second input of the three-stable trigger, the output of the second element AND-NOT connected to the third input

s 1164656. · 4

three-stable trigger, and the first output of three-stable trigger is connected to the third input of the second element AND element 2-ZI-2ILI-NOT and the first output bus, the second output of the three-stable trigger connect-. not the second output bus, the third, the output of the three-stable trigger 'is connected to the third input of the first element AND element 2 — ZI — 2IL — NOT and the third output bus, and the output of the second electronic switch is connected to the inverter input of the voltage comparator, whose direct input is connected with the second pin of the resistor. 15

The drawing shows a structural diagram of the proposed device.

The device contains the source 1 of the reference voltage, the outputs of which are connected to the inputs of the first 2 and second 20 electronic keys, a generator of 4 pulses, the forward and inverse / outputs of which are connected to the control inputs of the first and second electronic keys 2 and 3, 25 torr 5 voltages, direct input of which is connected through a resistor 6 to the input bus 7, inverse output to first input of first AND-NO element 8, direct - the first _W d input of the second element q NOR 9, wherein the generator inverse output 4 pulses connected to the first input ervogo AND gate 10, direct to the second input of the second elements,

that AND 1Ί · of the element 2-ЗИ-2ИЛИ-НЕ 12,. ^five

the output of which is connected to the second input of the three-stable trigger. 13 connected by exits 14, 15 and 16.

respectively with the first, second and. third weekend tires.

The source 1 of the threshold voltages is intended to form the upper and ₆ and lower _rn threshold voltages and can be realized, 45 times, on the basis of a stabilized power source and a resistive voltage divider consisting of three resistors.

Electronic switches 2 and 3 can 50 be performed, for example, on the basis of unipolar transistors and are intended for. transfer generated by the source 1 of the reference voltage to the inverting input of the comparator 5 55

stresses.

The generator 4 pulses is designed to form two sequences of pulses, one of which is shifted relative to the other by L radians, and can be performed, for example, on the basis of a symmetric multivibrator.

The voltage comparator 5 is designed to compare the input voltage with the reference voltage and form a high (low) potential at its direct (inverse) output if the input voltage is greater than the reference voltage and a low (high) potential if the input voltage is equal to or less than the reference voltage. As comparator 5, you can use integral comparators (for example, the 521 series) or operational increments with a differential input (for example, 140 series), moreover, the specific type of integrated circuits is selected depending on the required tolerance accuracy of the tolerance field and on the required device performance.

The three-stable trigger 13 is intended for generating output signals of the device and can be performed on three logic elements 2-2И-2ИЛИ-НЕ, while its state is described by positive logic, i.e. if the trigger is in the ίth state (ΐ = 1,2,3), then a high potential is formed at its ϊth output, and a low potential at its other outputs. In order to translate the trigger into the ίth state, it is necessary to apply a low potential to its ίth input, and a high potential to the other inputs.

Elements of the device: 8, 9 and 12 are standard logic elements.

 The device works as follows.

The pulse generator forms two shifted one relative to the other on the 7 radians of a sequence of pulses, one of which is fed to the control input of the electronic key 2, and the other to the control input of the electronic key 3. Moreover, if a high potential is formed at the inverse output of the generator 4 pulses ( i.e. a pulse is formed at the inverted output of generator 4), then the electronic key 2 is opened and from the source 1 of the reference voltages to the inverted input of the comparator 5 voltages

1164656. 6

voltage goes _in and corresponding to the upper threshold. When a high potential is formed to direct the output of the pulse generator 4, the opened electronic key 3 and 5 from the source of tss- 1 reference voltages at the inverting input of the comparator 5 is supplied voltages, the voltage L _n corresponding to the lower threshold.

The test voltage is applied to the input bus 7 of the device and that through a resistor 6 is fed to the direct input of the comparator 5. Three cases are possible: the value of the voltage under study lies above the tolerance field 15, i.e. and> and _in ; the value of the voltage under investigation lies in the 'tolerance field, i.e. and _m <and 4L _in ; the value of the voltage under investigation lies below the tolerance field, i.e. ϋ 4 and „. 20

The voltage comparator 5 forms in its direct (inverse) output a high (low) potential, if the value of the voltage applied to its direct input is greater than the value 25 of the voltage applied to its inverse input, and forms a low (high) potential, if the value direct The voltage applied to its direct input does not exceed the value of the voltage applied to its inverse input.

The tristable trigger 13 may be in one of three states. The trigger 13 is in the state a _and , if there is a high one at its output 14, and the potentials 15 and 16 have low potentials. This state of trigger 13 reflects the case when the value of the voltage under investigation lies above the tolerance field ϋ> υ _β .

'Trigger 13 is in the state ah _? , if on-its output 15 is present high, and on its outputs. 14 and 16 low potentials. This state of the trigger 13 reflects the case when the 45 value of the voltage under study lies in the tolerance field (and _n έ _Β ). The trigger 13 is in the state a ₅ , if high 16 is present at its output 16, and at outputs 14 and 15 - 50

low potentials. This state of the trigger 13 reflects the case when the value of the voltage under study lies below the tolerance field and is 4 and _n .

1. Consider the operation of the device 55 in the case when the voltage under test lies above the tolerance field, i.e. ϋ 5th _c . .

1.1. Suppose that in the inverse (direct) output of the generator 4 pulses a high (low) potential is formed, and the trigger 13 is in an arbitrary state.

The high potential output from the inverse pulse generator 4 is supplied to a control input of the electronic key 2, which permits passage, and _a voltage from the source 1 to the reference voltage input of the comparator 5 inventire voltages on the line input of which receives the test voltage ϋ .. Since n> _and, tone direct (inverse) output of the voltage comparator 5 a high (low) potential is formed.

A low potential from the inverse output of the voltage comparator 5 / is fed to the first inputs of the elements AND-HE 8 and AND 10. At the same time, at the output of the element AND-HE 8, a high potential is formed, which is fed to the first input of the trigger 13-, and on. element output And 10 formed a low potential.

Low potential from the direct output of the generator 4 pulses is fed to one of the inputs of the element 11, ensuring that. The lowest potential at the output of this element. Low potentials from the outputs of the elements And 10 and 11 are fed to the inputs of the element 2-ЗЙ-2ИЛИ-НЕ 12. and form-. At its output, a high potential rises at the second input of the trigger 13.

I High potentials from the direct output of the voltage comparator 5 and "from the inverted output of the generator 4 pulses arrive at the corresponding inputs of the element AND-HE 9 and form at its output a low potential that goes to the third input of the TK trigger.

Thus, high potentials arrive at the first and second inputs of the flip-flop 13, and low potentials come to its third input. This prevents the trigger from going to state a _3, regardless of its previous state.

In the next half of the high

(low) potential is formed on

direct (inverse) generator output 4 pulses.

1164656 '8

High potential from the direct output of the generator 4 pulses is fed to the control input of the electronic key 3, which allows the passage of voltage and _n from the source 1 5

reference voltages on the inverted input of the comparator 5 voltages, on the direct input of which is still. test voltage arrives.

Since u and _n , a high (low) potential remains at the direct (inverse) output of the comparator 5 voltages.

Low potential from the inverse output of the voltage comparator 5 * 5

arrives at the first input element AND-HE 8, which leads to the formation of a high potential at its output, which is fed to the first input of the trigger 13, the first input. 20 elements And 10, which leads to the formation of a low potential at its output.

Low potential from the output of the trigger 13 is supplied to one of the inputs 25 of the element 11 and forms at its output a low potential. Low potentials from the outputs of the elements And 10 and 11 are fed to the corresponding inputs of the element 2-ЗИ-2ИЛИ-НЕ 12, 30

thereby providing at its output a high potential that goes to the second input of the trigger 13.

A low potential from the inverted output of the generator of 4 pulses will be supplied to the second input of the element J – E 9 and forms a high potential at its output, which is fed to the third input of the trigger 13. '

Thus, high potentials arrive at all the inputs of the trigger 13, and its state therefore does not change. '

Therefore, for the time being, the voltage being examined is above the tolerance field _; 45 ϋ> and ₈ , the trigger is in a state that is characterized by high potential at output 16 and low potentials at outputs 14 and 15.

; 1.2. Suppose on the straight 55

(inverse) output of the generator 4

The high potential of the pulses is formed, and the trigger 13 is in the state a _ζ or a ₃ .

High potential with direct, 55

the output of the generator 4 pulses is fed to the control input of the electronic key 3, which allows the passage of

voltage and # from the reference voltage source to the inverted input of the voltage comparator 5, to the direct input of which the voltage under test is received and. Since and> 'and, a high (low) potential is formed at the direct (inverse) output of the voltage comparator 5. ·

Low potential from the inverse output of the 5 'voltage comparator. arrives at the first input of the element AND – NE 8 ’and at the first input of the element AND 10. At the same time, at the output of the element AND-HE 8, a high potential is formed, which is fed to the first input of the trigger 13, and at the output of the element 10, a low potential is formed.

A low potential from output 14 enters one of the inputs of the element 11 and forms a low potential at its output. Low potentials from the outputs of the elements And 10 and 11 are fed to the corresponding inputs of the element 2 — ZI-2ILI-NOT 12, thereby ensuring at its output a high potential, which is fed to the second input of the trigger 13.

Low potential from the inverted output of the generator 4 pulses pos. blunt to one of the inputs of the element · AND-HE 9 and forms at its output a high potential, which is fed to the third input of the trigger 13.

Thus, all the inputs of the trigger 13 receive high potentials, which ensures the preservation of its state.

If the flip-flop 13 is in the state ₍ state a ^, then the high potential from its output 14 goes to one of the inputs of the element 11, the other inputs of which receive high potentials respectively from the direct output of the voltage comparator 5 and from the direct output of the generator 4 pulses , which leads to the formation of a high potential at the output of the element AND 1.1. High - the potential from the output of the element 11 and goes to one of the inputs of the element 2-ZI-2ILI-NOT 12 and forms at its output a low potential that goes to the second input of the trigger 13 that provides ne ehod trigger 13 from state ₁ to states and.

/ ai ?.

9 1164656 GO

In the following, a half-cycle, a high (low) potential is formed at the inverse (direct) output of the generator, 4 pulses. In this case, the trigger 13 may be either in the state a ₂ -, \ 5

either able to a ₃ . The operation of the device in this case is described in clause 1.1.

: Thus, the case ϋ> υ _β ; the device recognizes no more than 10 in one pulse repetition period generated by the pulse generator 4.

2. Consider the operation of the device in the case when the test voltage lies below the tolerance field, i.e. .15 and ί and _n . .

2.1. Suppose that on the direct (inverse) output of the generator 4 pulses are formed, the high (low) potential and the trigger 13 is 20

in arbitrary condition.

High potential from the direct output of the generator 4 access pulses, em to the control input of the electronic key 3, which allows the passage of 25 voltage and _p from the reference voltage source to the inverting input of the voltage comparator 5, to the direct input of which the voltage under study is received and. Since and II _L , zo on the direct (inverse) output of the com-. ί The voltage of the tarator 5 is formed low (high) potential.

A low potential from the direct output of the comparator 5 voltage is supplied to the first input of the element AND-HE 9 and to the first input of the element 11. At the same time, the output potential of the element AND-NOT 9 forms a high potential, which is fed to the third input of the trigger. 13, and the output element And 11 low.

A low potential from the inversion output of the generator 4 pulses is fed to one of the inputs of the element E I Yu and forms a low potential at its output. Low potentials from the outputs of the elements And 10 and 11 are fed to the corresponding inputs of the element 2-ZI-2ILI-NOT 12 and form 50 at its output a high potential that goes to the second input of the trigger 13. ·

High potentials from the inverse output of the comparator 5 voltages 55

and from the direct output of the generator 4 pulses arrive at the corresponding inputs of the element AND-HE 8 and form

at its output is a low potential, which arrives at the first input of the trigger 13.

In this ^- way to the first flip-flop 13 is input a low potential, and in its' second and third inputs - high. This ensures that the trigger goes to state a, regardless of its previous state.

In the next half-cycle, a high (low) potential is formed at the inverse (direct) output of the generator of 4 pulses, and the trigger is in the a ^ state. This case is considered in clause 2.2.

.2.2 Suppose that on the inverse (direct) output of the generator 4 pulses a high (low) potential is formed, and the trigger 13 is in the state a ₃ or a ₂ .

The high potential output from the inverse pulse generator 4 is supplied to a control input of the electronic key 2, which permit circulation of pro- and voltage from the source 1 _to the reference voltage to the inverting input of the comparator 5 stress on direct input of which the voltage and the test. Since and <ϋ _Β , a low (high) potential is formed at the direct (inverse) output of the comparator 5 voltage. _

A low potential from the direct output of the generator of 4 pulses is fed to the second input of the AND-HI element 8 and to the second input of the H-11 element. At the same time, at the output of the HAND element. 8, a high potential is formed, which is supplied to the first input of the trigger 13, and a low potential is formed at the output of the And 11 element.

I

Low potential output 16 of the trigger 13 is fed to the third input element And 10 and forms at its output a low potential. Low potentials from the outputs of the elements 10 and 11 are fed to the corresponding inputs of the element 2-ZI-2ILINE 12 and form a high potential at its output, which is fed to the second input of the trigger 13.

The low potential from the direct output of the comparator 5 voltage is fed to the first input of the element AND-HE 9.

and forms at its output high

potential.

π 1164656 12

Thus., All the inputs of the trigger 13 receive high potentials, which ensures the preservation of its state.

If the flip-flop 13 is in co-status 5, then the high potential from the transducer output 16 goes to one of the inputs of the element 10, the other inputs of which receive high potentials respectively from the inverse of the comparator's 10 output. 5 voltages and from the inverted output of the generator 4 pulses, which leads to the formation at the output of an element And 10 of a high potential, which arrives at one of the inputs of the element 2-ЗИ-2ИЛИ-НЕ 12 and forms at its output a low potential, which in turn, it enters the second input of the trigger 13. This ensures that the '20 transition of the trigger from the state a ₃ to the state a ₂ . ''

. 'In the next half-cycle, a high (low) potential is formed at the direct (inverse) output of the generator of 25 pulses of 4 pulses, a. trigger 13 can either be in the state a. _and , either in the state a _g , This case was considered in clause 2.1.

Thus, the case of ϋ ё and

the device recognizes no more than one period of the pulse. owls, which are formed by generator 4, and as long as the voltage under test lies below the tolerance field, trigger 13 is in a state a ^, which is characterized by a high potential at the output 1.4.

. and low output potentials 15 and 16. _ '. ". · ₄₀

3. Consider the operation of the device in the case when the test voltage lies in the tolerance range, i.e.

and _p <and / and _e .

3.1. Suppose that the inverse ₄₅ (direct) output of the generator 4 pulse-. owls formed a high (low) · potential, and trigger 13 is in the state a and _n or a ₂ ,

- <50

A high potential from the inverted output of the generator 4 pulses is fed to the control input of the electronic switch 2. This allows the voltage P _& from the source 55 of the reference voltages to the inverting input of the voltage comparator 5, to the direct input of which it enters

test voltage and. Since both ί _and, on the straight (inverted) output of the comparator 5 is formed by a low voltage (high) potential.

The low potential from the direct output of the generator 4 pulses goes to the second input of the element AND-HE 8 and to the second input of the element 11. At the same time, a high potential is formed at the output of the element AND-HE 8, which is fed to the first input of the trigger 13, and at the output element 11 is formed low potential.

Low potential output 16 of the trigger 13 is fed to the third input element And 10 and forms at its output a low potential. Low potentials from the outputs of the elements And 10 and 11 arrive at the corresponding inputs of the element 2-ЗИ-2ИЛИ-НЕ 12 and form a high potential at its output, which is fed to the second input of the trigger 13.

The low potential from the direct output of the voltage comparator 5 enters the first input of the element AND-HE 9 and forms a high potential at its output.

Thus, all the inputs of the trigger 13 receive high potentials, which ensures the preservation of its sos-. tions

If the trigger 13 is in the state a ,, then the high potential from its output 16 goes to one of the inputs of the element 10, the other inputs of which receive high potentials respectively from the inverse output of the voltage comparator 5 and from the inverse output of the generator 4 pulses, which leads to the formation of a high potential at the output of the element I 10, which is fed to one of the inputs of the element 2-ЗИ-2ИЛИ-НЕ 12 and forms a low potential at its output, which, in turn, goes to the second input of the trigger 13. This provides peredtrigge and from state a to state ₃ a,.

Thus, in a given half-cycle, the trigger can be set either to the state a, or to the state a ₂ .

3.2, assume on the straight

(inverse) output of the generator 4

pulses formed high (low 13 1164656 14

cue) potential, and the trigger 13 is in the state a ₂ or a ₃ .

A high potential from the direct output of the generator 4 pulses is fed to the control input of the electronic 5 key 3, which allows the passage of voltage ϋ _Η from the source 1 of the reference voltages to the inverted input of the voltage comparator 5, to the direct input of which the test 10 voltage enters and. Since and> and _p , a high (low) potential is formed on the direct (inverse) voltage comparator 5 of the voltage.

Low potential with inverse 15

the output of the voltage comparator 5 is fed to the first input of the element AND-NOT 8 and to the first input of the element AND 10. At the same time, the output of the element AND-NOT 8 forms a high 20

the potential that arrives at the first input of the trigger 13, and a low potential is formed at the output of the element I 10.

A low potential from output 14 arrives at one of the inputs of the element 11 and forms a low potential at its output. Low potentials from the outputs of the elements 10 and 11 are fed to the corresponding inputs of the 2-ЗИ-2ЙЛИ-НЕ 12 element, thus ensuring, at its output, a high potential that is fed to the second input of the trigger Ϊ3.

Low potential from the inverse ₃₅ output of the generator 4 pulses is fed to. one of the inputs of the element EIN 9 and forms at its output a high potential, which is fed to the third input of the trigger 13.

Thus, all the inputs of the trigger 13 receive high potentials, which ensures the preservation of its state.

If trigger 13 is in state a ₇ , then high potential from its output 14 goes to one of the inputs of element 11, the other inputs of which receive high potentials, respectively, from the direct output of the voltage comparator 5 and from the direct output of the generator 4 pulses, which leads to the formation of a high potential at the output of the element And 11. A high potential from the output of the element And 11 enters one of the inputs of the element 2-ЗЦ-2ЙЛИ-НЕ 12 and forms at its output a low potential that enters the second input of the trigger 13, which ensures one trigger 13 from state a ₁ to state a ₂ .

Thus, in this half-cycle, the trigger can be set either to the state a ₂ , or to the state a $.

Consequently, the case ϋ _n 2 and. ϋ _{6 the} device recognizes no more than one period of the pulses generated by the generator 4, and as long as the test voltage is in the tolerance field, the trigger 13 is in the state a _g , which is characterized by a high potential at the output 15 and low potentials on exits 14 and 16.

This device compared to the prototype has more functionality and high speed.

Claims (2)

DEVICE ADMISSION. CONTROL, which contains electronic switches, a pulse generator, a voltage comparator, a resistor, is a reference voltage source, the first and second outputs of which are connected to the information inputs of the first and second electronic keys, respectively, whose control inputs are connected with inverse and direct outputs of the pulse generator, respectively, the output of the first electronic key is connected to the inverting input of the voltage comparator, the input bus connected to the first output of the resistor, characterized in that, in order to extend the functionality by indicating all logically) possible cases comparing the input voltage with the threshold voltage; two NAND elements are introduced into it, 2-ZI-. -2OR-NOT, tri-stable trigger, the inverse output of the comparator voltage is connected to the first input of the first element NAND and to the first input of the first element AND element 2-ZI-2ILI-NOT, the direct output of the voltage comparator is connected to the first input of the second element AND to the element 2-ZI-2ILI-NOT and to the first the input of the second element is NOT, and the direct output of the pulse generator is connected to the second input of the second element AND element 2-ZI-2, OR-NOT and c. the second input of the first NAND element, the inverse output of the pulse generator is connected to the second input of the first element AND the 2-ZI-2ILI-NOT element and to the second input of the second NAND element, the output of the first AND-NOT element being connected to the first input of the three-stable trigger, the output of the 2-ZI-2ILI-NOT element is connected to the second input of the three-stable trigger, the output of the second element is NOT connected to the third input of the three-stable trigger, and the first output of the three-stable trigger is connected to the third input of the second element AND of the second -ZI-2ILI-NOT and with the first the output bus, the second output of the three-stable trigger is connected to the second output bus, the third output of the three-stable trigger is connected to the third input of the first element AND element 2-ZI-2ILI-NOT and the third output bus, and the output of the second electronic key is connected to the inverse the input of the voltage comparator, the direct input of which is connected to the second output of the resistor. 5TS 1164656 ι 11.64656 2