SU875473A1 - Magnetic core testing device - Google Patents

Description

one

The invention relates to memory devices and can be used to control the electromagnetic parameters of magnetic cores.

A device is known comprising a master oscillator, a single pulse generator, a frequency division generator, an address register, a mode setting circuit, a rain and running dynamic mode circuit, a comparison circuit, an error counter, a raster circuit, and an electronic start or stop circuit l.

The disadvantage of this device is low speed,

Most suitable for the proposed technical solution is a device for monitoring magnetically microcircuits, a generator of remagnetizing current pulses, connected to the measuring unit through a gating unit connected to the comparator unit, bypass control, which output is connected to the measuring unit Full block5. t and ikhod - with a comparison knob output, a main switch, a single-axis connection to: a & pt & t® easy step-down regenerator, integrator, count converter, control units and counter clock hea- tor & pulses.

the output of which is connected to the first inputs of the main generator of the step voltage and the code-current converter, the second inputs of which are connected to the outputs of the control unit, the integrator input is connected to the output of the measuring unit and the code-current converter input, the other outputs of which are connected to the corresponding

10 inputs of step voltage generators and one of the control units, and the integrator output is connected to the first switch input, the second input of which is connected to the auxiliary generator output of the step voltage J and the output is connected to one input of the comparison unit, the other input of which is connected to the first output The main generator of step voltage, the second output of which is connected to the input of another control unit and the input of the auxiliary step voltage generator, the outputs of the control units are connected to the inputs Executive unit 2.

However, in the process of controlling cores, having the same static parameters, but different switching times, temporary location

30 g of the strobe does not correspond to the top of the impulse from the integrator, which leads to deterioration of the control accuracy and reduces the reliability of the device.

The goal of prevention is to increase the reliability of the device, as well as the accuracy of control.

The goal is achieved by 1 in the device for controlling magnetic cores, which contains a generator of alternating current pulses, a code-current converter, a measuring unit, an integrator, a main and auxiliary step voltage generators, a comparison circuit, a logic unit, a generator of counting pulses, gating a block and a switch, one of the outputs of the generator of the reversing current pulses connected to the input of the measuring unit, the output of which is connected to the input of the integrator and the first input the code-current converter, the second input of which is connected to the output of the counting pulse generator and the first input of the main step voltage generator, the third input is: to the first output of the logic unit, and the output to the first inputs of the auxiliary step voltage generator and logic unit and the second input of the main step voltage generator, the third input of which is connected to the second output of the logic unit, and the outputs are connected respectively to the second inputs of the logic unit and the auxiliary generator voltage and the first input of the comparison circuit, the output of which is connected to the third input of the logic unit, the outputs of the integrator and the auxiliary generator of the step voltage are connected respectively to the first and second inputs: m switch, the output of which is connected to the second input of the comparison circuit whose third input is connected with the release of the gating unit, introduced odds. The world of rectangular pulses, whose input is connected to the output of the measuring unit, and the output to the third input of the switch, the fourth input of which is connected to another output of the alternating alternating current pulse generator, the second output of the switch connected to the input of the gating unit.

Fig. 1 shows the functional diagram of the proposed device, Fig. 2 shows timing diagrams explaining the operation of the gating unit.

The device contains (Fig. 1) a shaper 1 of rectangular current pulses, a generator of 2 magnetizing current pulses, a code-current converter 3, a main generator of 4 steps of common voltage, a measuring unit 5, a strobe unit b, a switch 7, a controlled magnetic core 8 with a winding 9 poll. The device also includes an integrator 10, a comparison circuit 11, an auxiliary generator, 12 step voltage, a logic unit 13, and a counting pulse generator 14.

One of the outputs of the generator 2 magnetizing current pulses connected to the input of the measuring unit 5, the output of which is connected to the input of the integrator ID and the first input of the converter 3 code-current. The second input of the code-current converter 3 is connected to the generator output 14 of the counting pulses and the first input of the main generator of 4-stage voltage, the third input to the first output of the logic unit 13, and the output to the first inputs of the auxiliary generator

12 step voltage and logic unit 13 and the second input of the main generator 4 of the step voltage, the third input of which is connected to the second output of the logic unit 13, and the outputs are connected respectively to the second inputs of the logic block 13 and the auxiliary generator of the 12 step voltage and the first input of the circuit 11 comparisons. The output of the comparison circuit 11 is connected to the third input of the logic unit 13. The outputs of the integrator 10 and the auxiliary generator 12 of the step voltage are connected respectively to the first and second inputs of the switch

7, the output of which is connected to the second input of cxeivoa 11 of the comparison, the third input of which is connected to the output of the gating unit 6. The input of the rectangular impulse generator 1 is connected to the output of the measuring unit 5, and the output to the third input of the switch 7, the fourth input of which is connected The other output of the generator 2 is reversal current pulses. The second output of the switch 7 is connected to the input of the gating unit 6. The main generator of 4-step voltage (YT. 1) consists of a counting register 15 with digital indication, logical yuchey 16 and 17, etc. (18 eobrazovatel code-voltage.

Converter 3 code-current consists of a counting register 19 with digital. indication, logical keys 20 and the resistor matrix 21.

The generator 2 of magnetization reversal pulses, the current consists of a generator of 22 clock pulses and a driver of 23 current pulses. Logical block

13 contains control units 24 and 25, control unit 26 and execution unit 27.

The auxiliary voltage generator 12 consists of a trigger register 28, logic switches 29 and 30, and a voltage converter 31.

Winding 9 survey monitored magnetic core In performed in

needle needle measuring unit 5.

The diagram accepts notation; l - pulse MDS reversal (iW) fTi and constant MDS bias (lW) (j,

S impulses. The emf at the input of the integrator 10 (Fig. 1) in the control of cores with equal magnetic flux, but different switching time, the level of limiting the formation

OGR rotary puller 1;

B rectangular pulses at the output of the former 1,

g pulses at the output of the gating unit,

d pulses at the output of the integrator.

The device works as follows.

When exposed to controlled cores, for example, having equal magnetic fluxes, but different switching times, the constant MDS under magnetisation (, lW) o (Fig. 2a) and the pulsed magnetomotive magnetization reversal force (lW) y, (Fig. 2a) at the output The winding of the core, which is the output of the measuring unit 5, is induced by EMF pulses, equal in volt-second area, but different in amplitude and duration (Fig. 2b), entering the input of the integrator 10. At the same time, the gating pulses (Fig. 2, d) need to delay carry tionary perdnego front pulse MDS switching at different times so that they correspond to the top temporary location; pulse (Fig. 2D waveform 1) at the output of the integrator 10.

From the time diagrams, it can be seen that when measuring the flow of jF for a core having a longer switching time, the temporal location of the strobe pulse corresponds to the top and the leading edge of the pulse at the output of the integrator 10 (Fig. 2, b is the oscillogram 2), which leads to a sharp distortion measurement results. The measurement error of the flow increases even if the switching time is shorter than the delay time of the gating pulse relative to the leading edge of the pulsed MDS (Fig. 2, oscillogram 3) due to the decay of the pulse from the integrator. To eliminate this drawback, shaper 1 of rectangular pulses 1 generates rectangular pulses (Fig. 2, ft) from positive pulses of EMF taken from the output winding of the controlled core.

When measuring the magnetic flux iF or MDS (1W), the EMF pulses induced in the output winding of the controlled core arrive at

the input of the former 1 rectangular pulses, which, having amplified them in amplitude and produce a one-sided limitation at the level Uopp (Fig. 26), forms rectangular pulses in duration equal to the pulses of the EMF.

Square impulses s1PLITUDOY

and oGP and -duration, equal to the duration of the EMF in the secondary winding of the monitored core, through the switch 7 is fed to the input of the strobe unit 6, which from the rear front of the input pulse generates gating pulses (Fig. 2, d) coming to the comparison circuit 11.

When monitoring cores on nor5

ЬФ „D4J1T (to the POOF parameters

the input of the gating unit 6 through the switch 7 receives the clock pulses from the generator.

0

The technical and economic advantage of the proposed device lies in its higher reliability, as compared with the known, achieved by eliminating the manual setting of the delay value of gating pulses.

Claims (2)

Isobena Formula 0 A device for monitoring magnetic cores, comprising a current-reversing oscillator, a code-current converter, a measuring unit, an integrator, a main and 5 auxiliary step voltage generators, comparison circuit, logic block, counting pulse generator, gating block and switch, one of the outputs 0 generator alternating current pulses connected to the input of the measuring unit, the output of which is connected to the input of the integrator and the first input of the code-current converter, the second input of which is connected to the output 5 generator of pulse impulses and the first input of the main step voltage generator, the third input to the first output of the logic unit, and the output to the first inputs of the auxiliary step voltage generator and logical unit and the second input of the main step voltage generator, the third input of which is connected to the second the output of the logic unit, and the outputs are connected respectively to the second inputs of the logic unit and the auxiliary step voltage generator and the first input of the comparison circuit, output one of which is connected to the third input Logic block 0, integrator and auxiliary voltage generator outputs are connected respectively to the first and second inputs of the switch, the output of which five A KB is connected to the second input of the comparison circuit, the third input of which is connected to the output of the gating unit, characterized in that, the purpose of increasing the reliability of the device, it contains a square pulse former, the input of which is connected to the output of the measuring unit, and the output to the third input of the switch, the fourth. input of which is connected to another output of the generator of aphromatics pulses current, the second output of the switch is connected to the input of the gating unit. Sources of information taken into account during the examination 1. Kitovich V.V. Random Access Memory On magnetic cores and thin films. M.-L., Energie, 1965, p. 223-228. 2. USSR author's certificate I 526955, cl. G 11 C 29/00, 1975 (prototype).