SU484639A1 - Functional Coding Converter - Google Patents

Description

one

The invention relates to the field of electrical measuring technology and can be used for the functional coding of voltage and linearization of the characteristics of industrial sensors.

Functional coding transducers are known that contain eight keys, three integrators, three zero detectors, a control unit, a reference voltage source, a reference frequency generator, a counter, and an OR circuit, the converted values being fed to the inputs of the first and third keys, the first output of the reference voltage source the second is connected to the input of the fifth key, and the third to the input of the sixth. The outputs of the first and second keys through the first integrator and the first detector zero are connected to the first input of the control unit, the outputs of the third and fourth keys through the second integrator and the second detector zero to the second input of the control unit, the outputs of the fifth and sixth keys through the third detector zero and the third integrator is with the third input of the control unit. The output of the reference frequency generator is connected via the seventh key and the counter to the fourth input of the control unit, the output of which is connected to the second inputs of the zero and key detectors.

The disadvantages of the known devices are the limited functionality and low conversion accuracy.

The aim of the invention is to enhance the functionality and increase accuracy.

This goal is achieved by the fact that the proposed device additionally includes a ninth key, a reversible counter, and a functional measuring frequency converter. The input of this converter is connected to the output of the third integrator, and its output is via the ninth key, the OR circuit, the second input of which is connected via the eighth key to the output of the reference frequency generator, and the reversible counter is connected to the fourth input of the control unit.

FIG. 1 shows a block diagram of the proposed device; on fit. 2 - timing diagrams, explaining the principle of action.

The functional coding converter contains keys 1 and 2 connecting the input of the device with integrators 3 and 4 to which a controlled voltage source 7 is connected via keys 5 and 6. The outputs of integrators 3 and 4 are connected to the block input via detectors zero and 8 control 10, to another input of which detector zero is connected 11. The output of the control unit is connected to control m inputs of keys 1, 2, 5, 6,

12-16 and to the second inputs of the detectors zero 8, 9 and M. The outputs of the controlled source of the reference voltage 7 are connected via keys 15 and 16 and integrator 17 to the input of a functional measuring frequency converter 18, the output of which is connected via key 14 to one input of the circuit "OR 19. The other input of the circuit OR 19 is connected via a switch 13 to the frequency generator 20, to which the control unit 10 is connected via switch 12 and counter 21. The output of the circuit OR 19 is connected via a reversible counter 22 to the control unit 10.

The device works as follows.

At the initial moment, the control unit 10 generates a pulse, which opens the keys 1 and 42. Input voltage X comes to the input of integrator 3, and counter frequency 21 receives the frequency fo (from the reference frequency generator 20 via key 12). At the output of the integrators 4 and 17, a zero voltage is maintained. During the time Go - (where p - eat / 0

the bone of the counter 21) the integrator 3 integrates the voltage X. As soon as the counter 21 is filled, the control unit 10 issues a command to close the keys 1 and 12 and open the keys 2, 5, 14 and 15. At the same time, the voltage X arrives at the input of the integrator 4 , and the input of the integrator 3 is the voltage Xoi and the input of the integrator 17 is the voltage Xoi. Voltages, Ho2, ..., Hop, Xoi, Xdz, Xoz are generated by a controlled voltage source 7. At the output of the integrator 17, the voltage is changed according to the law:

Y -

(one) -

where T is the integrator time constant 17, t is the integration time. The output voltage of the integrator 17 is fed to the input of the functional measuring frequency converter 18, which has

characteristic. Accounting (1),

RMX

It is possible to write

f,

(2)

x, t

T. e. the output frequency of the functional measurement frequency converter 18 is inversely proportional to the time t.

The pulses from the output of the frequency measurement function converter 18 are fed through the key 14 and the circuit "OR 19 to" + the reversing counter 22. The voltage Aoi begins to discharge the integrator 3. At the same time, the voltage X is integrated by the integrator 4 until the detector zero 8 detects the zero voltage at the output of the integrator 3, after which the control unit 10 turns on the keys 1 and 6, the detector zero 9 and turns off the keys 2 and 5 and the detector zero 8. The integrator 3 is connected to the input voltage Xi, and the integrator 4 is supplied by the voltage Xoz from the manager audio reference voltage source 7. On reaching zero the output voltage of the integrator 4 is triggered zero detector 9, and a control unit 10

re-enables keys 2 and 5 and detector zero 8

and turns off keys 1 and 6 and detector zero 9.

The circuit operates cyclically defined d-the number of cycles determined by the control unit

10 for a given degree of a polynomial.

During these n cycles, the reversible counter 22 continuously counts the pulses from the functional measurement frequency converter 18. At the end

cycles, the control unit 10 stops the flow of pulses by closing the key 14. The time Tx from the moment the reversible counter 22 is set to zero until the end of the n cycles is equal to:

G ,, + G ,, + T ,, + ... + 7,

Vt

(3)

2 h 1

Because

T,

T ..., X-, T ,, ---- X

but

M (

t -

-Vif, V VV

THAT NUMBER recorded in the reversible counter 22 taking into account (2) is equal to

r, .- l, (t) t f d / r.

/ Lp i t

 () - / C- X

X,

Lp

X

(four)

If you meet the condition and

 uk

ft

1n

S

T,.

X

XQ

k-a

InVa.

(five)

0

That is, the number written in the counter 22 is proportional to the logarithm of the polynomial of the input quantity X.

After the end of the first cycle of operation, a signal proportional to the second factor or divider is input to the converter input. The operation of the Converter while the same as described above.

As a result of the n clock cycles of the coding converter, in the reversible counter the number of

TVs: In Z: In + In 2 V + ... +

+ In cpl / p In 2 d, W - ... - In2 e, nF.

;; -. 0s 0m 0

To perform the anti-logging operation, on command from the control unit 10, keys 14 and 15 are opened, the voltage Xo from source 7 is fed to the input of integrator 17. The output voltage of the integrator 17 is fed to the input of functional measurement frequency converter 18, the output pulses of which through the OR circuit 19 are fed to the (+) or (-) reversible counter 2Q depending on the sign of the obtained logarithm and write off the number NZ- The output frequency of the functional measuring frequency converter 18, as with logarithm nia, varies according to equation (2). The number of pulses arriving at the input of the reversible counter 22 is determined from the equation

L.

J - / (Odr ln / -ln / H.

At 4 1

N, nt. (8)

When the reversing counter 22 passes through zero, the control unit 10 issues a command, but with which the keys 14 and 15 are closed, the key 16 and the detector zero 11 are turned on. At this moment, i.e.

ln / lnZ. (9)

and, therefore, i.e., the voltage at the output of the integrator 17 at this moment is equal to

/ - / Z.

Now, the input of the integrator 17 from the voltage source 7 is supplied with the voltage of opposite polarity. and at its output the voltage decreases. At the same time from the generator 20 through the key 13 and the circuit 19 to the counter 22 receives pulses with a frequency of / 0. As soon as the voltage at the output of the integrator 17 reaches zero, the detector zero 11 is triggered and through the control unit 10 closes the key 13.

A number is written in the reversible counter, Z. (10)

Thus, the device allows logarithmization, potentiation, multiplication and division of power polynomials of the type

 k lp Q

a, Xy.b.Y ...

 .v

(P)

at

  ni

d, w ... y, l ,, f

without a significant increase in instrumentation.

Subject invention

A functional coding transducer containing eight keys, three integrators, three zero detectors, a control unit, a reference voltage source, a reference frequency generator, a counter, and an OR circuit, the converted values being fed to

the inputs of the first and third keys, the first output of the source of the reference voltage is connected to the inputs of the second and fourth keys, the second output to the input of the fifth key, and the third to the input of the sixth, the outputs of the first and

the second keys through the first integrator and the first detector zero are connected to the first input of the control unit, the outputs of the third and fourth keys through the second integrator and the second detector zero to the second input of the control unit, the outputs of the fifth and sixth keys through the third integrator and the third detector zero with the third input of the control unit, the output of the reference frequency generator through the seventh key and the counter is connected to the fourth

the input of the control unit, the output of which is connected to the second inputs of the zero detectors and keys, characterized in that, in order to expand the functionality and increase the accuracy, a ninth key, reversible counter and functional measuring frequency converter are additionally introduced into it, and the input of the measuring frequency the converter is connected to the output of the third integrator, and its output is through the ninth key, the OR circuit, the second input of which is connected via the eighth key to the generator output second frequency, and a reversible counter is connected to a fourth input of the control unit.

X (Y, Y..Fl

Logarithmiroan P otentio aniv