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Design of Electronic Circuit for Temperature Collecting System
Dec 25, 2017

Design of Electronic Circuit for Temperature Collecting System

Hardware Design of Temperature Collection System

Because different sensors have different output, but ultimately need to be converted to. 0 ~ 10V voltage value, so as to meet the A / D converter conversion requirements. Each sensor therefore requires a different conversion and amplification circuit. After the conversion of the amount of voltage through the multi-channel analog switch to the same A / D converter for conversion. And then through the FPGA for data processing and display output

PN junction temperature measurement principle

As the PN junction with the temperature change is a voltage signal, the temperature increased by 1 ° C. PN junction positive conduction voltage drop by 1mV. But at 0 ℃ when the output voltage required OV, it must be connected to the PN junction PN junction single-arm unbalanced DC bridge and the output voltage is amplified to 0 ~ 10v range to send A / D converter circuit schematic diagram (2) :

PT100 ($ 5.8752) thermal resistance temperature measurement principle hardware circuit

As the PT100 thermal resistance with temperature changes is a resistance signal, when the temperature increases the resistance increases. Therefore, the thermal resistance must be connected into a single-arm DC bridge, the resistance change is converted to voltage change signal. And then the voltage signal amplified to 0 ~ 10V range to send A / D converter circuit.

Thermocouple temperature measurement principle hardware circuit

Thermocouple output is a temperature-dependent voltage signal, it must be coupled with cold junction compensation circuit to work properly, and its output should be converted to 0 ~ 10V range A / D converter circuit. Circuit diagram shown in Figure 3:

Software Design of Temperature Collecting System

Temperature acquisition system software is divided into single-chip programming and F than A program design, single-chip program written in assembly language to achieve the control of the external circuit. FPGA using VHDL language to achieve the data processing and display the measured temperature output. The temperature acquisition system can achieve PN junction (20 ~ 100 ℃), thermal resistance (PT100) (0 ~ 800 ℃), thermocouple methods of temperature measurement. To meet the different measurement range, different measurement accuracy and the needs of different occasions. The design uses EDA as a development tool, with SCM control makes the whole design with newer design ideas. Using 12 ADC analog-digital converter, making the measurement accuracy has been greatly improved. Data processing using field-programmable gate array PFGA (EPIK30QC208-3), its high program execution speed makes the system faster and more accurate response.

In this paper, a temperature acquisition system based on MCU and EDA is designed, which can realize temperature measurement of PN junction, thermal resistance (PT100), thermocouple (nickel nickel silicon K) Of the measuring range, different measurement accuracy and the needs of different occasions. The design uses EDA as a development tool, with SCM control, making the whole design with newer design ideas.


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