SU1280592A1

SU1280592A1 - Device for controlling temperature

Info

Publication number: SU1280592A1
Application number: SU853949066A
Authority: SU
Inventors: Юрий Дмитриевич Барков; Геннадий Антонович Дубров; Владимир Иванович Урода; Александр Геннадьевич Слободич; Игорь Викторович Викторов; Сергей Ульянович Мисурагин
Original assignee: Предприятие П/Я Ю-9789; Предприятие П/Я Р-6209
Priority date: 1985-09-02
Filing date: 1985-09-02
Publication date: 1986-12-30

Abstract

Изобретение относитс к автоматике и может быть использовано дл регулировани температуры объектов с различными теплофизическими свойствами при измен ющихс внешних услови х . Устройство обеспечивает форсированный выход объекта на режим при переходе к плавному регулированию температуры, при этом за счет наличи в устройстве дифференциатора сигнала датчика, выходной сигнал которого запоминаетс в блоке пам ти, управл ет работой коммутатора и затем при помощи блока делени нормирует сигнал рассогласовани , повьшаетс точность регулировани вследствие того, что порог перехода устройства от форсированного нагрева к регулируемому формируетс в зависимости от скорости нарастани температуры объекта . Управление нагревателем осуществл етс при помощи тиристорного исполнительного элемента, управл ющие СЛ сигналы на который подаютс при помощи двух ключевых элементов и сумматора . 1 ил.The invention relates to automation and can be used to control the temperature of objects with different thermal properties under changing external conditions. The device provides an accelerated output of the object to the mode when switching to smooth temperature control, while due to the presence in the device of the differentiator of the sensor signal, the output signal of which is stored in the memory unit, controls the operation of the switch and then using the divider normalizes the error signal, increases the accuracy because the threshold of the transition of the device from forced to controlled heating is formed depending on the rate of increase in the temperature of the object. The heater is controlled by means of a thyristor actuator, which controls the trunk signals to which are fed using two key elements and an adder. 1 il.

Description

Изобретение относитс к автоматическому регулированию температуры и может быть использовано в системах термостатировани .This invention relates to automatic temperature control and can be used in thermostatic systems.

Цель изобретени повьшение точ- ности. °The purpose of the invention is to improve the accuracy. °

На чертеже изображена структурна электрическа схема устройства.The drawing shows a structural electrical circuit of the device.

Устройство дл регулировани температуры содержит датчик 1 темпера- ,туры, задатчик 2 температуры, элемент 3 сравнени , компаратор 4, первый ключевой элемент 5, сумматор 6, второй ключевой элемент 7, дифференциатор 8, блок 9 пам ти, блок 10 де- Ленин, инвертор 11, источник 12 опорного напр жени , тиристорный исполнительный элемент 13 и нагреватель 1The temperature control device comprises a temperature sensor 1, a tour, a temperature setting device 2, a comparison element 3, a comparator 4, a first key element 5, an adder 6, a second key element 7, a differentiator 8, a memory block 9, a block 10 de Lenin, inverter 11, voltage source 12, thyristor control element 13 and heater 1

Устройство работает следующим образом .The device works as follows.

Сигнал с датчика 1 температуры, пропорциональньй температуре образца поступает на вход элемента 3 сравнени и на вход дифференциатора 8. На второй вход элемента 3 сравнени поступает сигнал .с задатчика 2 температуры . С выхода элемента 3 сравнени The signal from the temperature sensor 1, proportional to the temperature of the sample, is fed to the input of the comparison element 3 and to the input of the differentiator 8. The second input of the comparison element 3 receives a signal .c from the temperature setpoint 2. From the output of the element 3 comparison

сигнал, пропорциональный разности сигналов датчика 1 температуры и задатчика 2 температуры, поступает на первые входы блока 10 делени и компаратора 4. С выхода дифференциатора 8 сигнал, пропорциональный скорости изменени температуры образца, поступает в блок 9 пам ти, который хранит информацию о скорости нарастани температуры. С выхода блока 9 сигнал поступает на второй вход компаратора 4 и тем самым задает порог его срабатывани в зависимости от теплофизических свойств образца.Этот же сигнал поступает на второй вход блока 10, с выхода которого разность сигналов датчика 1 температуры и задатчика 2 температуры, пронормирован нал по сигналу из блока 9 пам ти, по тупает на вход первого ключевого э ггемента 5. С выхода компаратора 4 сигнал управлени электронными ключами подаетс на управл ющий вход первого ключевого элемента 5 и через инвертор 11 на управл ющий вход второго ключевого элемента 7. Таким образом , первый 5 и второй 7 ключевые элементы работают в противофазе. При большой разнице между текущей темпе- ратурой образца и заданной, когда сигнал с выхода элемента 3 сравнени больше сигнала с выхода блока 9, ком5A signal proportional to the difference between the signals of the temperature sensor 1 and temperature setpoint 2 is fed to the first inputs of dividing unit 10 and comparator 4. From the output of differentiator 8, a signal proportional to the rate of temperature change of the sample enters memory block 9, which stores information about the temperature rise rate . From the output of block 9, the signal goes to the second input of the comparator 4 and thus sets the threshold for its operation depending on the thermophysical properties of the sample. The same signal goes to the second input of block 10, from the output of which the difference of signals from temperature sensor 1 and setpoint temperature 2 is normalized signal from memory block 9, arrives at the input of the first key element 5. From the output of the comparator 4, the control signal of the electronic keys is fed to the control input of the first key element 5 and through the inverter 11 to the control input to orogo core element 7. Thus, the first 5 and second 7 key elements operate in antiphase. With a large difference between the current temperature of the sample and the set one, when the signal from the output of the comparison element 3 is larger than the signal from the output of block 9,

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0 5 0 5 0 5 0 5 0 5 0 5

паратор 4 вьщает сигнал, который зак- рьгоает первый ключевой элемент 5 и открывает второй ключевой элемент 7, через который сигнал с выхода источника 12 опорного напр жени , соответствующий форсированному режиму нагрева, поступает на один из входов сумматора 6. С выхода последнего этот сигнал поступает в тиристорный исполнительный элемент 13, который устанавливает форсированный режим нагрева дл электронагревател 14. Когда сигнал с выхода элем1ента 3 сравнени становитс равным или меньше сигнала с выхода запоминающего блока 9 пам ти, компаратор 4 срабатывает таким образом, что измен ет пол рность сигнала на своем выходе на противоположную. При этом второй ключевой элемент 7 закрываетс , а первый ключевой элемент 5 открываетс и сигнал с выхода блока 10 делени через первый ключевой элемент 5 поступает на другой вход сумматора 6. При этом формируетс сигнал автоматического управлени Parator 4 raises the signal that closes the first key element 5 and opens the second key element 7, through which the signal from the output of the source 12 of the reference voltage corresponding to the forced heating mode enters one of the inputs of the adder 6. From the output of the last, this signal arrives to the thyristor control element 13, which sets the forced heating mode for the electric heater 14. When the signal from the output of the comparison element 3 becomes equal to or less than the signal from the output of the memory storage unit 9, which Pattern 4 operates in such a way that it changes the polarity of the signal at its output to the opposite. At the same time, the second key element 7 is closed, and the first key element 5 is opened and the signal from the output of dividing unit 10 goes through the first key element 5 to another input of adder 6. At the same time, an automatic control signal is generated.

р К ut/ §p K ut / §

где it - сигнал, пропорциональныйwhere it is a proportional signal

разнице текущей и заданной температур образца;the difference between the current and set temperature of the sample;

-гг сигнал, пропорциональный скорости изменени температуры образца во времени и режиме форсированного нагрева;-yy signal proportional to the rate of change of the sample temperature over time and the mode of forced heating;

К - коэффициент передачи блока 10.K - transfer coefficient of block 10.

Коэффициент передачи К устанавливаетс из услови равенства сигналов на выходе делител 10 и источника 12 опорного напр жени в момент переключени компаратора 4.The transmission coefficient K is determined from the condition of equality of signals at the output of the divider 10 and the source 12 of the reference voltage at the time of switching the comparator 4.

Сигнал автоматического управлени с выхода сумматора 6 поступает на вход тиристорного исполнительного элемента 13, который регулирует мощность, рассеиваемую нагревателем 14, пропорционально этому сигналу.The automatic control signal from the output of the adder 6 is fed to the input of the thyristor actuator 13, which controls the power dissipated by the heater 14, is proportional to this signal.

В предлагаемом устройстве выбор порога регулировки осуществл етс , автоматически в зависимости от скорости нагрева образца. Это позвол ет достигнуть высокой точности регулировки за счет учета вли ни измен ющихс внешних условий и теплофизических свойств образцов.In the proposed device, the adjustment threshold is selected automatically depending on the sample heating rate. This makes it possible to achieve high adjustment accuracy by taking into account the influence of changing external conditions and the thermophysical properties of the samples.

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Claims

This invention relates to automatic temperature control and can be used in thermostatic systems. The purpose of the invention is to increase accuracy. ° The drawing shows a structural electrical circuit of the device. The temperature control device comprises a temperature sensor 1, tours, a temperature setpoint 2, a comparison element 3, a comparator 4, a first key element 5, an adder 6, a second key element 7, a differentiator 8, a memory block 9, a 10 deLenin block, an inverter 11, voltage source 12, thyristor actuator 13 and heater 1 The device operates as follows. The signal from the temperature sensor 1, proportional to the temperature of the sample, is fed to the input of the comparison element 3 and to the input of the differentiator 8. A second signal is received from the second input of the comparison element 3. From the output of the comparison element 3, a signal proportional to the difference between the signals of the temperature sensor 1 and the setpoint 2 of temperature is fed to the first inputs of dividing unit 10 and comparator 4. From the output of differentiator 8, a signal proportional to the rate of change of the sample temperature is fed to memory block 9, which stores information about the rate of increase in temperature. From the output of block 9, the signal goes to the second input of the comparator 4 and thus sets the threshold for its operation depending on the thermophysical properties of the sample. The same signal goes to the second input of block 10, from the output of which the difference of signals from temperature sensor 1 and setpoint temperature 2 is normalized by a signal from memory block 9, arrives at the input of the first key element 5. From the output of the comparator 4, the electronic key control signal is fed to the control input of the first key element 5 and through inverter 11 to the control input v Key element 7. Thus, the first 5 and second 7 key elements work in antiphase. When the difference between the current temperature of the sample and the set one is large, when the signal from the output of the comparison element 3 is greater than the signal from the output of block 9, comparator 4 outputs a signal that locks the first key element 5 and opens the second key element 7 through which the signal from the output of source 12 the reference voltage corresponding to the forced heating mode is fed to one of the inputs of the adder 6. From the output of the latter, this signal enters the thyristor control element 13, which sets the forced heating mode for The electric heater 14. When the signal from the output of the comparison element 3 becomes equal to or less than the signal from the output of the storage unit 9 of the memory, the comparator 4 is activated in such a way that it changes the polarity of the signal at its output to the opposite. At the same time, the second key element 7 is closed, and the first key element 5 is opened and the signal from the output of dividing unit 10 goes through the first key element 5 to another input of adder 6. At the same time, an automatic control signal is generated К K / / where it is a signal proportional to the difference between the current and set temperature of the sample; -yy signal proportional to the rate of change of the sample temperature over time and the mode of forced heating; K is the transmission coefficient of unit 10. The transmission coefficient K is determined from the condition that the signals at the output of the divider 10 and the source 12 of the reference voltage are equal at the time of switching the comparator 4. The automatic control signal from the output of the adder 6 is fed to the input of the thyristor actuator 13, which controls the power dissipated by the heater 14, is proportional to this signal. In the proposed device, the adjustment threshold is selected automatically depending on the sample heating rate. This makes it possible to achieve high adjustment accuracy by taking into account the influence of changing external conditions and the thermophysical properties of the samples. 312 The invention The device for temperature control, comprising a sensor and a temperature setting device, a comparison element, a comparator, the first and second key elements, a differentiator, a voltage source, as well as a series-connected adder, a thyristor actuator and a heater, and a sensor and setting unit temperatures are connected to the inputs of the reference element, the output of which is connected to one of the inputs of the comparator connected by the output to the control input of the first key element, the input differential Ator connected to the temperature sensor output.

and one of the inputs of the adder - with the output; Go element. 2 house of the second key element, in order to increase accuracy, a memory block, a divider block and an inverter are inserted, the memory block input is connected to the differentiator output, and its output is connected to another comparator input and the first input of the block dividing, the second input of which is connected to the output of the reference element, and the output - to the input of the first key element, the output of which is connected to another input of the adder, the input of the second key element is connected to the output of the reference voltage source, and the comparator output through the inverter chen to the control input of the second key