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VGU RESEARCH REPOSITORY


Please use this identifier to cite or link to this item: https://epub.vgu.edu.vn/handle/dlibvgu/892
Title: Design a test bench system for thermal electric cooler (TEC)
Authors: Phan Xuan Hoang 
Keywords: Thermal electric cooler;Test bench system;Measurement system;PID controller;Microcontroller;Test plate;Matlab simulink;Testing system
Issue Date: 2015
Publisher: Vietnamese-German University
Abstract: 
To evaluate TECs, these should be operated at constant current and constant hot side
temperature. The temperatures are much higher than actual operating temperatures to accelerate the lifetimes of the TEC. This test is intended to track long term changes in performance due to temperature affects.
The aim of this thesis is to build a general system to control the temperature of Test Stand and to obtain data from external measurement device; the data obtained during the processing must be displayed on a computer and saved to hard disk for further tracing.
The first step is design a temperature controller board to control the Test Plate by changing the power supply for the AC heater attached to. To overcome this issue, the zero-crossing detection of AC main power and Triac driving circuits is develop to control the power feeding to AC heater. Besides, the signal condition circuit also applied to this controller board to measure the temperature of Test Plate by NTC thermistor, that temperature will be used as feed-back signal for PID algorithm to control the Test Plate more precise.
When the temperature controller board is completed developed. The next items in my project is identify and modelling the Test Plate with heating behaviours. The modelling of the object is developed by Matlab identification tools. After the estimated transfer function of system is obtained, the modelling of system combined with PID controller is built to simulation the changing of P, I and D parameters which is also got form Nichols-Ziegler tuning method. By this step, the developing time for the PID controller will decrease and the desire result is also easy to recognise in graphic. The last step for building the temperature controller board is test the PID controller in the real system with the simulation parameter retrieve form matlab - simulink , the response of system is satisfied the requirement we aim to.
The second objective of this thesis is developed the computer software application that could configure the Test Plate’s temperature to controller board as well as measure the voltage and temperature of TEC by Agilent data acquisition 34970A.
To well complete the Testing Software, the libraries form Microsoft (System IO) and driver of Agilent devices (IVI, VISA-COM) is reference to computer program developed in C# language .The desire temperature is sent to microcontroller via Serial port of computer and UART of ARM LM4F120. Then, next page of this application will screen out the test data of TEC measured by Agilent instrument which is controlled with SCPI command form computer test application. All of tested data is recoded in Access Database, a format of Microsoft office.
URI(1): http://epub.vgu.edu.vn/handle/dlibvgu/892
Rights: Attribution-NonCommercial 4.0 International
Appears in Collections:Mechatronics & Sensor Systems Technology (MSST)

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