SU1298778A2 - Function generator - Google Patents

Abstract

This invention relates to analog computing. The purpose of the invention is the expansion of the class of tasks. This goal is achieved by introducing a second unit 25 for isolating the difference in moduli from the sum and difference of signals (X and Y, X and h), which makes it possible to reproduce characteristics such as deadband, limiting, soft limiting deadband with limiting and piecewise linearly approximated square, exponential and sinusoidal and other functions. The type and inflection points of the non-linear transformation are determined by the level of the reference voltages Y and h and the sign of the summation of the signals on the algebraic adder. 2 il-o (L

Description

The invention relates to analog computing and is an improvement of the invention according to the author. No. 1150632.

The purpose of the invention is to expand the class of reproducible functions.

FIG. 1 shows a functional diagram of a functional converter; in fig. 2 - static characteristics of the converter (2a - restriction, 2S - soft limit, 2fe - deadband, 22 - deadband with restriction, 2 Hey 2e - piecewise linearly approximated sinusoidal functions

+ 51 + 5J

on the ranges --- and -t-, respectively).

The functional transducer contains five operational amplifiers 1-5, primary 6 and additional 7 algebraic adders, eight commuting d-codes 8-15 and eight load resistors 16-23, Z, Z 2 and Z, j, respectively, the first, the second and the third outputs of the Converter, and the elements 1-3, 8-11, 16-19 and 4, 5, 7, 12-15. 20-23, the first 24 and second 25 blocks of the module modulus difference from the sum and the signal difference are respectively (X and Y, X and h X, Y and h are the signals on the first, second and third transducer inputs, respectively

The operation of the functional converter (for the case when the input signals of the converter are X (t), Y (t) and h (t)) is described by the relations ensuring the operations of separating the module difference from the sum and difference of two signals

Z, ± КДХ (, С) + Y (t) f - X (t) - - Y (t) (1)

Zs ± Kj | X (t) + h (t) - - | X (t) - h (t) |, (2)

where Z and Z are the output signals of the first and third outputs of the converter, respectively

K and K are the gains of the first and second blocks 24 and 25, respectively; X (t), Y (t) and h (t) are the input signals of the converter. .

The operation of the device for the case of input signals X (t), Y.o, (i.e. one of

the inputs are fixed - Y (c) Y, and the signal h is not input to the input) is described by the following relations (for K 0.5).

I. Limitations (Fig. 2a)

z; | ± X at 1 X (t) l I YJ (3) lY at X (t) l .lYJ

Ii. A soft limit (Fig. 25) is for the case of summation of signals in the main algebraic adder 6.

Zj b2x at i x (t) l yj

ItXl Y ,, for lX (t), 1 Y,

(four)

0 0

50

0

five

five

Iii. Deadband (Fig. 2b) - for the case of subtraction of signals B mainly algebraic adder 6.

, oh when ix (t) l 1 yj

Bx tY, with u (t)

where Z is the output signal of the converter at the second output; - Y is the reference voltage for forming the nonlinear characteristics of the converter. Similar ratios describe the operation of the converter on the outputs Z and Z when the signal is disconnected by applying a reference signal h at the output of block 2.

The operation of the proposed device for the case of input signals X (t), Y, h is described by the relation

Oh oh

Z; i (Kjx (t) + Yji to x (t) +

+ h J) - (Kj X (t) - Yj.tK, tX (t) - - hJ) (c), (6)

where K, j is the gain of the main algebraic adder 6 by the second input X (t). In case of disconnecting the signal X (c) from the main algebraic adder 6, the output Z of the converter generates a non-linear characteristic of the dead zone type with a limitation - FIG. 2 In the remaining cases, piecewise linearly approximated quadratic, exponential, sinusoidal, cosine-a /: real and other functions can be formed at the output of Z, j.

On fi1. 2a, e are piecewise linear approximated sinusoidal functions on the ranges

Ji -And

5TG

t-g respectively, depending on 4

Most of the construction of the approximating function, relation (6) will be modified in form and shape.

about ,

 J

(2K, + 2K2 - Kj) X (t), with | X (t) | I y

(2К2 + кр -XCt) + 2К, „, with U eU U (t) Ih

K.X (t) + K (K, Y K, h, with I X (t) I 1 hj.

The signs of the inputs of the main algebraic adder 6 (summation, subtraction of the signals Z, Z, and X) are determined by the type of the approximated function or the type of the nonlinear transformation function.

The invention is reduced to combining the functions of 2-X non-linear converters of blocks 24 and 25 that perform various conversion functions (in this case, a controlled voltage limiter and a controlled deadband), which allows to solve additionally the problem of approximation of power, exponential sinusoidal and other functions.

Claims (1)

The invention is a functional converter according to auth. No. 1150632, characterized in that, in order to enhance the Kotass reproducible functions, the fourth and fifth multistation amplifiers, a third and a fourth, are introduced into it. For example, to approximate a sinusoidal function in the range.– --- relation (6) looks as follows about , (7) This pair of switching diodes, four load resistors and an additional algebraic adder, the output of which is the third output of the converter and is connected to the third input of the main algebraic adder connected by the third input to the non-inverting and first inverting inputs of the fourth and fifth operational amplifiers connected by vi codes with the common The third and fourth pairs of counter-parallel included commuting. diodes, free outputs of the switching diodes of the third and fourth pairs through the corresponding load resistors are connected to the zero potential bus and to the corresponding inputs of the additional algebraic adder, the inverting input of the fourth operational amplifier is connected to the second inverting input of the fifth operational amplifier and the third information input of the transformer . Editor V.Danko Compiled by N.Zaitsev Tehred I.Popovich Proofreader A.Obruchar Order 892/53 - Circulation 673 Subscription VNISh State Committee of the USSR for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Projecto st., 4