SU737962A1 - Magnetic function generator - Google Patents

Description

(54) MAGNETIC FUNCTIONAL TRANSFORMER

The invention relates to analog computing, in particular, to nonlinear functional converters. A functional converter made on magnetic amplifiers using semiconductor resistance 1 as a master nonlinear element is known. Such a functional converter has an output signal power sufficient for direct use in industrial automation circuits The disadvantage of this converter is a limited class of reproducible functions. The closest to the proposed is a magnetic functional npeo6pa3OBaTejfb, which contains a generator of control pulses and a magnetic amplifier with serially connected output windings, the total "output of which is connected to the first terminal of the supply voltage 2 through a load resistor. The disadvantage of this converter is the inability to reproduce other functional dependencies, except quadratic. If it is necessary to reproduce other dependencies, the voltage form of one of the sources should be changed. Constructing power supplies with a voltage shape other than sinusoidal and rectangular is a difficult independent task. The purpose of the invention is to expand the class of reproducible functions. To achieve this goal, a magnetic functional converter containing a control pulse generator, a magnetic amplifier with series-connected output windings, the common output of which through a load resistor is connected to the first terminal of the supply voltage source, rectifier elements and series of shunt resistors and control keys, the chains are connected in parallel with the output windings of the magnetic amplifier, and the rectifier element is connected between oh terminal of the power supply source and the free output of the corresponding

the output winding, the control inputs of the control keys are connected to the outputs of the control pulse generator. ..

Figure 1 shows a general structural diagram of a magnetic functional converter; Fig. 2 shows the shape of the control current curve of a magnetic amplifier with self-absorption; Fig. 3 shows the characteristics of the pass-through characteristic of the magnetic magnetic amplifier with self-saturation (curve 1) and with the introduction of pulsed shunting (curve 2); in fig. 4 is an example of a specific transmitter conversion.

The magnetic functional converter contains a magnetic amplifier 1, rectifying elements 2 and 3, control switches 4-1.- 4p, shunting resistors 5, generator 6 control pulses, power supply source with terminals 7, load resistor 8. Magnetic amplifier 1 has output windings 9 and 10 ..

Magnetic functional Converter works as follows. The nonlinear dependence of the output signal of the magnetic amplifier assembled according to the self-saturation scheme on the TSGSCHNOT signal is computed by implementing the pulse-by-shunting mode of the output windings of the amplifier. Control pulses are such that the unlocking interval of the shunt keys is always less than the half-period of the supply voltage.

Since it is proposed to use a shunting interval with a duration of less than half a period, the gain is reduced only by parts of the pass characteristics. Thus, the pass-through characteristic of the magnetic amplifier is deflected. If there are several shunting sections, the resistance values of the shunt resistors are different for different sections, and the passing characteristics of the magnetic USE lIl can reproduce complex functions with high accuracy but not having extremes.

The effect of a local decrease in the gain of the Accumulator shunting is explained by the following sample. The dependence of the output voltage on the saturation angle for magnetic amplifiers with self-attenuation is expressed by the equation

/ tt and t -Y

НСЕ RM,

 i) +

()

and. „(1

n

/ g

W,

yy

and - the load voltage

resistor;

fj - efficiency, working circuit; rectangular amplitude

supply voltage; d - core angle; coercive force

 - dynamic hysteresis loop; Z - the length of the average line of force

core; Cc- load resistance

resistor 8;

Wp is the number of turns of the output winding. The dependence of the control current on the saturation angle is expressed by the equation

- ± J. Нс-т I,, a (

 (1), (2

v W

. where the magnitude of the coercive force

Static loop hysteresis Magnetic choke type amplifier is described by the expression

(3)

I, W

 I

w

n p where 1ts is the load current. . .

Since during the deep shunting of the working winding valves, the magnetic amplifier with self-accelerating turns into a throttle amplifier, such as, therefore, the control current increment in the shunting interval corresponds to equation (3) In the Excitation mode, the control current does not depend on the presence of shunting intervals and is still determined by the value of the coercive force of the dynamic hysteresis loop (first term of the right, part of the second expression).

. If the shunting interval takes a part of the control half-period in such a way that it starts at oi and ends at the end of the half-period (when n iJTr-), then the control current curve takes the form shown in Fig. 26, which shows that when the angle of saturation changes the interval of shunting the increment of the control current is significantly larger than the increment of the control current when the angle of saturation changes to the interval without shunting. Therefore, in this example, the gain of the magnetic amplifier 1 has a different size of pass-through characteristic sections.

The functional converter, made on the basis of a magnetic amplifier with self-saturation in the mode (see Fig. 2, b) under the condition of free even harmonics is described by the expression

(i-S 4- -: i1rc2W,

Vwl

Ll

()

T

where K and K are coefficients determined by the expression

but

(five)

(Ul) 1

g + v

P lr

where g is the resistance of the output winding 9;

r is the resistance of the direct circuit of the gate-shunt resistor; , - reverse resistance

OUT

this chain. When determining K, consider the key to be closed, when determining K, consider the key to be open.

Use of group managed. Keys 4 - 4p with resistors 5 "allow, with appropriate control, to have, at different intervals of the power supply half-period, different values of shunt resistances, and therefore, in different parts of the transmission characteristic of the converter, different gain factors.

The analog functional converter during one half-period of the supply voltage operates as follows (see Fig. 4),.

With the beginning of the first half period, core A begins to magnetize, s, core B - demagnetize. The rectifier element 2 is open, the rectifier element 3 and the control key 4 are closed. In the control winding, a current is set to

ki

(B)

W ,,

At the moment of saturation, t w, the core is saturated. Change The induction in core A stops. The current in the control circuit is determined by the demagnetization process of the core B through a static hysteresis loop.

Is

-WITH-).

oLr

With the occurrence of t, y

from the exit

U)

generator b, the controlled key 4 receives a trigger pulse, key 4 opens, the shunt is closed to valve 3,

The change in induction in core B stops. The working winding of the core B starts to flow a current, the value of which is determined by the ratio of the resistances of the working circuits with core A and B (if they are equal, then the working currents are equal). In accordance with the law of the total current in the control circuit, a current is established.

W ou

i (H

in the next half-period, the processes are repeated, only the A-cores

and B change roles. The average value for the control current period is determined by the expression (4).

As a generator of control pulses, the highly stable Ilyin bridge element can be used.

The generator tuning (regulation of the duration of shunting pulses), tuning of the shunt circuits (regulation of the depth of shunting) is achieved by changing the values of the corresponding resistances. A change in the depth of shunting, length; the points of shunting intervals allow modeling a wide class of functions described as monotonic, functions without extremes.

20

Claims (2)

1. Rosenblat MA The use of magnetic elements for processing information in analog form. - Sat. Magnetic analog Elegance, M., Science, 1965, p.10. . 2. Copyright. Certificate of the USSR №543950, cl. G About G 7/20, 1977 (prototype). .. - V - ,,. 737962 . Fig 2 L-,. 1.-J: CM Fzg.4 (It) w-fc iu. Fig.Z p T - S7 --- -ir "if l .. ill