SU1354173A1 - Temperature change speed regulator - Google Patents

Abstract

The invention relates to automatic devices for temperature control and can be used in various process control systems with a given rate of temperature change, a J3 controller containing a pulse generator, which through a reversible counter, a digital-analog converter (D / A converter), a comparison element and a control unit controls the change object temperature, in order to simplify, the OR element and the AND element are introduced, which through a comparator connected by inputs to the temperature sensor outputs DAC and the output to the input elements, or that provides an accelerated testing of the signal mismatch due to the direct feed through the AND and IL1l pulse generator to the input of the reversible counter. 1 silt, with O1

Description

The invention relates to automatic temperature control devices and can be used in various electronic, thermal, other devices, for example, in control systems of technological processes.

The purpose of the invention is to simplify the controller.

The drawing shows a block diagram of the regulator of the rate of change of temperature.

The controller contains a generator of 1 pulses, an AND 2 element, a divider of 3 frequencies, a first switch 4 an element OR 5, a second switch 6, a reversible counter 7, a digital-analog converter 8, a comparator 9, the comparison element 10, a P temperature sensor. control unit 12, actuating element 13,

The regulator works as follows.

In the initial state, after the power is turned on, the output of the comparator 9 is a logical O signal and the And 2 element is closed. A stable frequency signal from the output of the pulse generator 1 is fed to the input of a digital frequency divider 3, which has seven outputs to form different rates of temperature change. Switching to the desired speed is carried out with the help of switch 4, Pulses from the selected output of the digital frequency divider 3 through the first switch 4 is fed to the first input of SHP 5 and from its output. through the second switch 6 to one of the inputs of the reversible counter 7. The position of the second switch 6 determines the counting direction of the reversing counter 7 (heating or cooling). From the output of the reversible counter 7, the binary code is fed to the corresponding inputs of the digital-to-analog converter 8, at the output of which a linearly varying voltage is generated corresponding to a predetermined rate of temperature change. This signal is fed to the input of the comparison element 10, at the output of which a voltage level is formed corresponding to the difference between the signals of the temperature sensor 11 and the digital-to-analog converter 8, the voltage from the output of the comparison element 10 is amplified

control unit 12 and enters the actuating element 13.

The need for a comparator 9 is as follows. If the absolute value of the difference between the input signals of the comparator 9 (from the output of the temperature sensor 11 and the output of the digital-to-analog converter 8) does not exceed the critical value b..f then a logical O signal is present at the output of the comparator. At bVg, uVg, the comparator goes to the state logical 1 and stays there until uV is zero, i.e. until the signals from temperature sensor II and digital-to-analog converter B are level. Thus, by setting the comparator 9 to VB ,, P more than the magnitude of possible temperature fluctuations in the chamber, one can achieve the elimination of its influence on the process of controlling the rate of temperature change.

When the regulator is turned on, when the reversible counter is in an arbitrary state and, consequently, the OPC can have a value greater than V, the comparator 9 is triggered, a logical 1 signal appears at its output, This signal opens the element AND 2 and pulses c the outputs of the master oscillator 1 pulses begin to arrive at the second input element OR 5. Regardless of the signal at the first input of the adder (O or 1), pulses with the frequency of the master oscillator 1 appear at its output. These pulses through the second switch 6 begin to arrive no backhoes to the input of down counter 7. The result is a rapid conversion to the down counter until iiV becomes zero, i.e. until the output of the digital-to-analog converter 8 establishes a signal corresponding to the temperature of the object at the current time point. Comparator 9 is set to the logic state O and turns off the output of the master oscillator 1 from the element OR 5, the signal at the output of the reversible counter, and hence the output of the digital-to-analog converter 8, starts to change at a given speed, which corresponds to the normal operation of the regulator .

Similarly, the circuit works in the event of a malfunction of the controller, exceeding 1 × x dUh.cr. The adjustment error is automatically compensated, which also improves the accuracy of the regulator.

Since the value of uVg, - is set slightly larger than the value of the maximum permissible fluctuations in the temperature of the object, is the permissible error for the device.

Thus, simplifying the proposed temperature rate regulator increases the reliability of its operation, which contributes to its wider use in various fields of science and technology.

Claims (1)

Invention Formula A temperature rate regulator containing a temperature sensor, a pulse generator connected in series and a divider often 10 15 0 five You are a series-connected reversible counter, a D / A converter, a reference element, a control unit and an actuator j, as well as a first switch and a comparator, with the output of the temperature sensor connected to another input of the comparison element, and the comparator inputs are connected to the inputs of the comparison element differing in that, for the sake of simplicity, the controller contains an AND element, an OR element. and the second switch, the inputs of the element And are connected to the output of the pulse generator and the output of the comparator correspondingly, and its output is connected to one of the inputs of the element ISH-1, to the other input of which is connected the output of the first switch connected by the inputs to the output of the frequency divider, the output of the element OR connected to the input of the second switch connected to the outputs of the summing and subtracting inputs of the reversible counter, respectively. Editor N. Bobkova Compiled by G. Kreiman Tehred M. Khodanich Proofreader M. Maksimishinets Order 5693/43 Circulation 863 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035 ,. Moscow F-35, Raushsk, emb., D.A / 5 Production and printing enterprise, Uzhgorod, Projecto st., 4