SU1161919A1 - Programmed control device - Google Patents

Abstract

1. SOFTWARE CONTROL DEVICE containing a DC source, adjustable resistors, AC source, integrating element, switching, relay, characterized in that, in order to simplify the device and increase its accuracy, the element And, triggers, key are introduced into the device transistors and comparators, the first inputs of which are connected to the outputs of the respective sources of the reference voltage, and the integrating element is designed as a capillary mercury electrolytic resistor, the first electrode of which o is grounded, and to the second electrode through a switch (contact of the first switching relay, opening and closing contacts of the second switching relay, respectively, the first and second parallel circuits formed by adjustable .. 1 II 1Г-Г1;; .. connected to each other through the corresponding closing and spreading contacts of the third switching relay, a DC source is connected, while the second electrode is also connected to the input of the AC amplifier, the output of which through a rectifier will amplify Is the direct current connected to the second inputs of the comparators, whose outputs through element I are connected to the input of the first trigger connected in series with the second trigger, the corresponding outputs of the trigger are connected to the bases of the respective southgach transistors, the output windings of the first, second and third switching relays, one of the windings of the first coded coil relay being connected to the power supply through a start button, and the output of the DC amplifier connected to the output of the device. 2. Device pop. 1, in order to expand the field of application of the device by ensuring the formation of a trapezoidal change in the output signal, the output of the device is connected to the output of the DC amplifier and the first input of the corresponding comparator via the corresponding switching relay of the fourth switching relay, the winding of which connected to a power source through parallel circuits, one of which is formed by closing it by the contact of the second and heating

Description

the cycle of the third switching volume of the relay, and the friend - the closing contact 1161919 of the third and the opening contact of the second switching relay.

one

The invention relates to instrumentation, in particular, to technical means of control, and can be used in process plants for growing single crystals with a given law of temperature variation over time, in process lines for conducting electroplating, as a software device during technological processes. The aim of the invention is to simplify the device and increase the accuracy, as well as to ensure the formation of the keystone law of the output signal change. FIG. 1 is a schematic diagram of a software control unit in FIG. 2 - the cyclogram of his work. The device consists of adjustable resistors 1-4, disconnecting and closing contacts 5-10 switching relays, an alternating current source 11, a capillary mercury-electrolytic resistor 12, a disconnecting contact 13, an AC amplifier 14, a rectifier 15, a DC amplifier 16, opening and closing contacts 17 and 18 switching relays, comparators

from. + resistor contacts 5 - contacts 8-contacts 13-element (resistor)

In this direction of the control current, a change occurs in the internal resistance of the capillary mercury electrolytic resistor 12: the resistance of the resistor increases linearly. To convert this resistance into an electrical signal of an alternating voltage on the electrodes of the resistor 12, a signal from an alternating current source 11 is supplied through a separating capacitor. The converted internal resistance of the element 12 is the magnitude of the alternating input voltage 19 and 20, the switching and closing contacts 21 and 22 of the switching relays, fourth switching relay 23, opening and closing contacts 24 and 25 switching relays, element 26, triggers 27 and 28, first, second and third switching relays 29-31, cond Sensor 32, elements OR 33 and 34, key

(p.1)

After amplifying and rectifying, this signal is fed to the input of the DC amplifier 16, then to the inputs of the comparators (comparators can be made on UD140 8A type microcircuits), respectively on the Comparators 19 and 20. On the second inputs The comparators are supplied with reference signals corresponding to the minimum and maximum values of the output signal of the program control unit. 35-37 transistors, start buttons 38. Reference voltage sources are not shown. The device works as follows. In the initial state, the windings of the switching relays 29 and 30 are de-energized, and the contact 13 is in the open state (Fig. 1), the trigger 27 is in the zero state, and at the output of the comparators 19 and 20 there are respectively a logical zero and a logical one . The device is started using the start button 38. At this, the relay 31 is turned on, the contacts 13 are closed and the control current lu from the DC source Uu starts flowing: The initial value at the output of the amplifier 16 before the device is put into operation may be less than Ugp, - For this direction of control current (in accordance with claim 1), when the output signal of amplifier 16 begins to increase, when the input signal of the comparator 19 changes from the value and in Den. Of the value UB OO.rnin Uon. The comparator's output instead of the logical O is logical 1, and on in The output of the comparator 20 is 1, since the comparator 19 is made non-inverted and the Comparator 20 is inverse. I When there are comparators 19 and 20, respectively, O, and there is a logical 1 at the output of element 26, and at the transition through point O (Fig. 2 ) at the output of the comparators - respectively

{- - "- resistor 3

-contact 7- relay - contacts 13 - resistor With this direction of the current manager, the internal resistance of the capillary mercury electrolytic resistor 12 begins to decrease, respectively, the output signal of amplifier 16 decreases (section AB in Fig. 2). At the outputs of the comparators 19 and 20, there are 1 and 1, respectively, and, at the output of element 26, O. When the output signal j of the amplifier 16 reaches 110, the point B (Fig. 2) has 1 at the output of comparator 20, the output of the comparator 19 - respectively.

- -resistor 2 - ". contacts 6- contacts contacts 13 - resistor (p.З)

The signal at the output of the amplifier 16 increases in this direction, and when the value Uj is reached, the output of the comparator 19 is 1, and the output of the comparator 20, respectively, O. At the same time, the output of the element 26 is logical (- J.

resistor 4

- pins 13 - t2 resistor

When the output signal is reached, the output of the comparator 19 is O, and the output of the comparator 20. At the element element 26, there is a signal 1 at this. A trigger 27 is thrown and, at its output, b-30 contacts 9

(p.2)

ka 1 (point C in Fig. 2). As a result, flip-flop 27 is thrown, relay 29 is turned on, and relay 30 remains in the on state. Thus, relays 29 and 30 remain in the on state. The control current flows;

contacts

1. Relay 29 is turned off, switching trigger 28, and relay 30 is turned off. Simultaneously, a positive pulse appears at the inverse output of trigger 28, which through capacitance 32 and logic elements 194 this output of element 26 will be O. Since trigger 27 is triggered with a positive voltage drop at its input, it retains its original state and therefore relays 29 and 30 remain in their original state and the control signal continues to flow in the same direction (source) through the elements indicated in clause 1, and amplifier output It increases with time. When Ub is reached, Uon.mih (Fig. 2) has a logical O at the output of comparator 20, and 1-1 at the output of comparator 19. With this combination, the output of element 26 has a positive pulse difference at which the trigger 27 is activated and the relay is activated 29. As a result, pins 9 are turned on and pins 8 are opened. The control current flows in the opposite way: With this combination, the signal at the output of element 26 is logical 1. The signal at the output of element 26 transfers trigger 27 to its initial state (O at its output) and simultaneous transfer the trigger 28, as a result of which the relay 29 is de-energized, and the relay 30 is triggered, as a result, the control current of the capillary mercury-electrolytic resistor starts to flow through the circuit elements as follows: 33 and FOR goes to the base of key transistors and the relay contacts 31 times are cried. Thus, the circuit returns to its original state. In order to ensure the trapezoidal law of change of the output characteristics of the program-control device, a relay 23 with open-loop is provided in the circuit. 17 and closing contacts 18, which are included at the output of the device, moreover, contacts 17 are connected directly to the output of amplifier 16, and contacts 18 are connected to the source of reference signals and 81.Of, - The common point of contacts 17 and 18 is connected to the input terminal of the device. The coil of the relay 23 is connected in series with the power source through parallel circuits, one of which is formed by the closing contact 21 of the relay 29 and the opening contact 22, and the other by the closing contact 24 and the closing contact 25 of the relay 29. In the time interval O - t) the device has a signal , coming directly from the output of amplifier 16. In this area, contacts 21 and 24 are open, the relay 23 is in a de-energized state. When the input signal of the amplifier 16 reaches the value (J d (fig. Relay 29 turns on, contacts 21 are closed and relay 23 is triggered (contacts 17 are closed and contacts 18 are closed), and the output signal goes directly to the output of the device, such. In the time interval i :, - t /, the output ncTpoficTBa receives a signal n- {1, because when the output fl of an op, radio signal of the amplifier 16 changes from (J d to U and from U g d the relay coil 23 remains in an activated state. In section AB, a relay 29 is turned on, contacts 21 and 22 are closed, and in section EC an relay 3 is turned on 0 i.e. contacts 24 and 25 are closed, and thus in section i, - io, the continuous on state of relay 23 is closed, since at this interval current flows through the relay coil through contacts 21 and 22 or 24 and 25, t ie the device output signal is equal to Uon. mar At section i -i, relay 29 is turned on, contacts 22 are opened and relay 23 is turned off, contact 18 is opened, and contact 17 is closed and the output of the device again receives a signal from the output of amplifier 16. With the help of resistors 1-4, the rate of rise and fall of the output characteristic is adjusted, i.e. rate of change in output over time. Thus, according to all the main indicators, the proposed device has fundamental technical characteristics. advantages compared with the prototype: a linear law of variation of the output value, identical to the change, for example, temperature, the independence of the output signal from voltage fluctuations and the frequency of the power supply network, the accuracy of the temperature setting (not less than 1%), the ability to control the rise time, constant level and the decay time of the temperature level without introducing additional programs and elements into the circuit, fully automating the control process. Due to the advantages listed above, the quality of the grown crystals is improved and the number of rejected crystals is reduced. At the cost of a single crystal 3.5-6 thousand rubles. a 10% reduction in rejects yields an economic effect from using one installation of about 12 thousand rubles. In addition, maintenance personnel is released, which gives an economic effect of 1.4 thousand rubles. The total economic effect from using one unit will be 13.5 thousand rubles.

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 Yi

01

Claims (2)

1. SOFTWARE-CONTROLLER DEVICE containing a direct current source, adjustable resistors, an alternating current source, an integrating element, switching relays, characterized in that, in order to simplify the device and increase its accuracy, an And element, triggers, key transistors and comparators, the first inputs of which are connected to the outputs of the respective sources of reference voltage, and the integrating element is made in the form of a capillary mercury-electrolytic resistor, the first electrode of which is earthed n, and to the second electrode through the make contact of the first switching relay, opening and closing contacts of the second switching relay, respectively, the first and second parallel circuits formed by adjustable resistors connected to each other through the corresponding closing and opening contacts of the third switching relay, a DC source is connected while the second electrode is also connected to the input of an AC amplifier, the output of which is connected to a watt through a rectifier and a DC amplifier by the other inputs of the comparators, the outputs of which through the AND element are connected to the input of the first trigger connected in series with the second trigger, the corresponding outputs of the triggers are connected to the bases of the corresponding key transistors, the output circuits of which include the windings of the first, second, and third switching relays, with one output of the winding of the first The switching relay is connected to the power source via the start button, and the output of the DC amplifier is connected to the output of the device. 2. The device according to π. 1, characterized in that, in order to expand the scope of the device by ensuring the formation of a trapezoidal law of change of the output signal, the output of the device is connected to the output of the DC amplifier and the first input of the corresponding comparator through respectively opening and mA closing contacts of the fourth switching relay, the winding of which connected to the power source through parallel circuits, one of which is formed by the closing contact of the second and opening; * the contact of the third switching relay, and the other with the closing contact of the third and the opening contact of the second switching relay.