SU1599874A1 - Variable-conductivity element - Google Patents

Abstract

The invention relates to computing and can be used in automatic control and control devices, in information measurement systems and devices where non-linear discrete signal transformations need to be performed. The goal is to increase accuracy by increasing the order of the reproducible rational function. This is achieved by the fact that the element with controlled conductivity contains the first smoothing capacitor 1, the first 2 and second 3 information terminals of the element with controlled conductivity, the first 4, the second 5, the third 6, the fourth 11, the fifth 12 and the sixth 13 scale resistor, the first key 7, the second smoothing capacitor 8, the second 9 and the third 10 keys, the third 14 and the fourth 15 smoothing capacitors. In this case, the control inputs of the first 7, second 9 and third 10 keys are combined and are the control input 16 of the element with controlled conductivity. 1 il.

Description

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with

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The invention relates to computing technology and can be used in automatic control and control devices, in information measurement systems and devices where non-linear discrete signal transformations need to be performed.

The purpose of the invention is to improve the accuracy by increasing the reproducible rational function.

The drawing shows a functional diagram of the element with controlled conductivity.

The element with controlled conductivity contains the first smoothing capacitor 1, the first 2 and second 3 data terminals of the element with controlled conductivity, the first 4, second 5, third 6 scale resistors, first 7 key, second 8 smoothing capacitor, second 9 key, third 10 key, fourth 11, fifth -12 and sixth 13 scale resistors, third 14 and fourth 15 smoothing capacitors / control input 16 of the element with controlled conductivity

Element with controlled wire-. The bridge works as follows.

Dependence of the average value of the conductivity g of the element with controlled conductivity on the relative length b of the control p-pulse-modulated signal

(PWM signal) supplied to input 16 has the form

g ci K Yi at O,

(ABOUT

Where

-I

the relative duration of the IMI signal, which is a sequence of rectangular pulses of duration (and repetition period T;

K - coefficient of proportionality.

The HRTS signal entering the input 16 of the element with controlled conductivity controls the average values of the conductivities of the series-connected keys 7, 9, and 10 and the scale resistors 6, 4 and 12, respectively. As a result, the total average conductivity for the scale resistor R, connected in series with the key to which the S # n-signal is supplied, will be equal to AO. Smoothing capacitors 1,8,14 and 15 provide suppression of the higher harmonics of voltage arising when switching keys. Due to this, the element is dissipated in alternating current, which allows considering only the average values of its conductivities.

The conductivity of the proposed element can be represented by the expression

/ "H G5G6 e About OggS„ e + (, (2)

g (0), С ,, (Г ,, П ,, -н С G, - G, f. „

 % e with ,, e.p ... in

g (9) P, 0 H- - G7,

t: (). e h.L1. -13

year

P

G

it

G, G,

at yx at 1

(four)

where G, Gj, G, G, G, G, is, respectively, the conductivity of the scale approximation in the form of .ra-resistors of 4,5,6,11,12 and 13-rational function with a given error of 6.05%, those.

, 1,8683.хЗ + 1,1888-х2 + 4, .5)

. R (x) -3-T792T2: T77G4 0 Lx + 5.2298-10.

The given error is determined by the formula

(3)

) .e h.L1. -13

G

it

G, G,

at yx at 1

(four)

An approximation in the form of a rational function with a reduced one over R - is valid. 100% at X e 0; 1J (6)

 I max i / x.

To calculate the conductivities of the scale element resistors, expression (5) is converted to

R (x)

3,4155..10- X

975 792-10-s + X

 - | 1, 5267.x2 + 4.2027-10-foc, 6 T 5.5172

(7)

ten

Comparing expressions (3) and (7), you can create a system of equations:

ABOUT,

five

3, 4155. ; 9.4792-10;

(eight)

1.5267;

controlled conductivity, the first informative element output terminal is connected to the first output of the first large-scale resistor and, through a series-connected second large-scale resistor, the third large-scale resistor, and the first switch to the second informative conductivity element of the second and third large-scale resistors through the second smoothing capacitor is connected to the zero potential bus, the second output of the first large-scale resistor is connected to the first output of the second key, the second inform The controlled output element of the element with controlled conductivity is connected directly and via the third key to the first terminals of the fourth and fifth scale resistors, respectively; the second terminals of the fourth and fifth scale resistors are connected to the first terminal of the sixth scale resistor to a third smoothing capacitor , the control inputs of the first, second and third keys. From this system of equations, the definitions are connected to the control input of the conductivity of the scale resis-JQ element impacted conductivity

characterized in that, in order to increase accuracy by increasing the order of the reproducible rational function, a fourth smoothing capacitor is inserted into it through which the second output of the sixth power resistor and the second output of the second key are connected to the zero potential potential.

15

20

11Gm1, 4.2027

R

10tt

(% and P,

1mz S.

0.3

1.8264;

 P

25

P

 VS

i5 5.5172 -10

.3

tori.

Claims (1)

Invention Formula A controllable conductivity element containing a first smoothing capacitor, the terminals of which are, respectively, the first and second information terminals of the element.