magistrsko delo
Rok Ahlin (Author), Danijel Vončina (Mentor)

Abstract

Delo obravnava izdelavo temperaturno regulirane komore za analizo toplotne prevodnosti različnih teles. Glavni cilj naloge je določitev koeficienta toplotne prevodnosti različnih vzorcev s pomočjo meritev temperature na njihovi površini. Izvedena je meritev temperature na štirih vzorcih IMS vezij, ki imajo različne koeficiente toplotne prevodnosti in analiza sposobnosti odvajanja toplote. V drugem poglavju je obravnavan opis celotnega sistema. Opisane so posamezne komponente sistema in merilna vezja za merjenje temperature in električnih veličin v temperaturno regulirani komori. V tretjem poglavju je podan opis osnovne programske sheme mikrokrmilnika ter problematika AD pretvorbe za temperaturno meritev. Opisana je težava z meritvijo temperature in podan nov način proženja AD pretvornikov, s katerim se v največji možni meri zmanjša vpliv motenj. Podana sta opisa nastavite parametrov tokovnega in temperaturnega regulatorja. Opisano je tudi delovanje uporabniškega vmesnika in komunikacija z mikrokrmilnikom. V predzadnjem poglavju so podani rezultati meritev toplotne prevodnosti teles različnih materialov z absolutno tehniko merjenja toplotne prevodnosti. Opravljene so tudi meritve temperaturnih porazdelitev IMS vezij ter analiza sposobnosti ohlajanja posameznega IMS vezja. Opisan je tudi poskus določitve izgub v IMS vezjih.

Keywords

temperaturno regulirana komora;analogno-digitalni pretvornik;PI regulator;Peltierovi elementi;toplotna prevodnost;magisteriji;

Data

Language: Slovenian
Year of publishing:
Typology: 2.09 - Master's Thesis
Organization: UL FE - Faculty of Electrical Engineering
Publisher: [R. Ahlin]
UDC: 621.3(043.3)
COBISS: 90853379 Link will open in a new window
Views: 177
Downloads: 38
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Other data

Secondary language: English
Secondary title: Temperature controlled chamber with thermoelectric elements
Secondary abstract: The thesis addresses the determination of the thermal conductivity coefficient of various samples by temperature measurement inside a temperature controlled chamber. It also focuses on the comparison of four IMS circuits with different thermal conductivity coeffients, based on heat flow analysis. First, the production of temperature controlled chamber is described. The description consists of all the components of the system. It also describes all the electric circuits, measuring the electrical and thermal quantities. The core of this paper describes the basic program flowchart of the micro-controller and the problem with analogue-todigital conversion of the temperature measurement. High switching frequency of MOSFET transistors in a H-bridge turns out to be very problematic, causing large disturbances in the temperature measurement. It also has a significant impact on the temperature control. In order to minimize the disturbances, a new way of triggering the analogue-to-digital converter of a temperature measurement is proposed. Rather than PID, PI controller is used due to its smaller disturbance sensitivity. At the end of this paper, the results of thermal conductivity coefficient measurement of different materials via absolute technique are presented. Heat losses and the cooling ability of four IMS circuits is also analysed. Heat loss determination based on required cooling power of the IMS circuits cannot be confirmed as credible.
Secondary keywords: Temperature controlled chamber;analogue-to-digital converter;PI controller;Peltier elements;thermal conductivity;
Type (COBISS): Master's thesis/paper
Study programme: 1000316
Embargo end date (OpenAIRE): 1970-01-01
Thesis comment: Univ. v Ljubljani, Fak. za elektrotehniko
Pages: XXIV, 89 str.
ID: 14167735