magistrsko delo
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: |
2021 |
Typology: |
2.09 - Master's Thesis |
Organization: |
UL FE - Faculty of Electrical Engineering |
Publisher: |
[R. Ahlin] |
UDC: |
621.3(043.3) |
COBISS: |
90853379
|
Views: |
177 |
Downloads: |
38 |
Average score: |
0 (0 votes) |
Metadata: |
|
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 |