SU1474483A1 - Device for monitoring parameters of temperature control system - Google Patents

Abstract

The invention relates to automatic temperature control systems and is intended to build a device for temperature control. The purpose of the invention is to improve the accuracy of the linearization of the monitored signal and enhance the functionality. The device for monitoring the parameters of the temperature control system allows the two-output setpoint values to be set with high accuracy on the digital display board and to ensure continuous measurement of the true temperature value. When switching the contact of the first or second switch to the input of the ADC, the signal from the output of the two-level setter is received, and the required value of the regulated or alarm temperature value is set on the digital display. With normally closed contacts of the first and second switches, the signal of the thermal sensor is fed to the ADC input, and the true temperature value is continuously displayed on the digital display. 1 il.

Description

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The reference relates to automatic temperature control systems, in particular digital analog signal meters.

The purpose of the invention is to improve the accuracy of the linearization of the monitored signal and the expansion of the functional potential.

The drawing shows a functional diagram of the device.

The device consists of a thermal sensor 1, an amplifier 2, a two-level setting device 3, a switch 4, consisting of the first 5.1 and second 5.2 switches, a matching amplifier 6, a rezhnitelny divider 7, a source 8 of the reference voltage 8, an adder 9, an analog-digital converter (ADC 10, a digital indicator 11, a comparator 12, a first actuator element 13, a differential amplifier 14, a voltage-frequency converter 15, and a second actuator element 16.

The device works as follows.

The signal from sensor 1 through amplifier 2 is fed to the input of differential amplifier 14, the other input of which receives the required value of the signal from the output of the two-level setter 3. At the output of the differential amplifier, the error signal enters the input of the voltage-frequency converter 15, the output of which controls

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the operation of the first actuating element 16, with which the temperature is controlled.

The output signal of the amplifier is also fed to the input of the comparator 12, to the other input of which is received the alarm value of the signal from the second i output of the two-level setter. When the signals at the input of the comparator are aligned, a comparator is triggered, the output signals of which control the operation of the second actuating element 13, which is used to signal the emergency situation.

On the temperature measurement channel when the contact of the switch 5.1 is closed, the signal from the first output of the two-level setting device comes to the input of the ADC and the required setting value of the adjustable temperature setting is indicated on the digital indicator board. When the contact of the switch 5.2 is closed, the signal from the second output of the two-level setting device comes to the ADC input and the value of the alarm level of the parameter is displayed on the digital indicator board.

The output signal of the amplifier also goes through the normally closed contacts of the first 5.1 and second 5.2 switches to the input of the matching amplifier 6, the output of which goes to information input 10.1 of the A / D converter 10, where, after conversion, the code signals through the output 25 A / D buses enter the digital indicator 11 where the true value of the measured temperature is displayed. Introducing the adder 9 and the resistive divider 7 brings the liner 30 to the informational input of the nonlinear characteristic of the thermal sensor by smoothly changing the reference voltage of the push-pull ADC voltage by removing part of the information signal from the 35 slider of the resistive divider and feeding it to the adder input, to another the input of which receives a constant voltage from the source 8 of the reference voltage. The output signal of the device 40 is fed to the input 10.2 of the reference voltage of the ADC. The conversion of the temperature sensor signal is performed with linearization using the push-pull integration method .45

Claims (1)

Invention Formula A device for controlling the parameters of the temperature control system, comprising a reference voltage source, a digital indicator and an ADC, characterized in that, in order to improve the linearization accuracy of the monitored signal and enhance the functionality, a matching amplifier, adder, resistive divider and switch are introduced into it matching the ADC with the first output of the resistive divider, the second output of which is connected to the common bus, and the slider of the resistive divider is connected to the first input of the summat a second input coupled to a source of reference voltage, the output of the adder is connected to the reference voltage input ADC output buses which are connected to a digital indicator, to an input of a matching amplifier connected to the switch output, the inputs of which are intended for connecting the temperature sensor outputs and bi-level setpoint. ;;