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Konstruktion av temperaturreglerad kalorimeterkammare
Örebro University, School of Science and Technology, Örebro University, Sweden.
2014 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesisAlternative title
CONSTRUCTION OF A TEMPERATURE REGULATED CALORIMETER CHAMBER (English)
Abstract [sv]

Att mäta effektförluster hos switchad elektronik är mycket svårt med hjälp av elektrisk

mätutrustning, framför allt när switchfrekvensen är hög. Sedan ett tiotal år tillbaka har dock

den kalorimetriska mätprincipen, som ursprungligen kommer från kemins värld, blivit

uppmärksammad i sådana sammanhang. En kalorimeter kan mäta effektförlusten från ett

godtyckligt objekt och är därför passande vid mätning av switchförluster. Denna rapport

handlar om tillverkningen av kammaren till en kalorimeter som är konstruerad för mätobjekt i

effektklassen 50 till 100 W och som möjliggör effektmätningar med en noggrannhet som

understiger 0,2 W. För att minimera effektförlusterna genom kalorimeterns kammarväggar,

regleras temperaturen på dessa. Även kammarens inre lufttemperatur regleras för att undvika

att den skenar iväg när den värms av mätobjektet.

Rapporten beskriver bland annat kalorimeterkammaren på systemnivå, vilken onoggrannhet

som kan härledas till bristerna i kammaren, samt hur regulatorerna har dimensionerats.

Abstract [en]

It is very difficult to measure switching losses, using electrical measuring instruments,

especially at high switching frequencies. Calorimetric measuring methods have gained more

and more attention over the last decade in the area of power loss measurements for switch

mode power electronics. Calorimeters have been used by chemists for a long time and their

main benefit is that they can measure the power losses from any object, which is why they are

so suitable for measuring switching losses. This paper describes the construction of the

chamber for a calorimeter, designed for measuring 50 to 100 W devices, with a possible

accuracy of less than 0,2 W. To minimize the power losses through the walls of the chamber,

their surface temperatures are regulated. The air temperature inside of the chamber is

regulated as well, to provide it from overheating when heated by the device under test.

This paper describes, for instance, the calorimeter chamber on a system level, the measuring

errors related to the chamber as well as how the temperature regulators are designed.

Place, publisher, year, edition, pages
2014. , 26 p.
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:oru:diva-36250OAI: oai:DiVA.org:oru-36250DiVA: diva2:742260
Subject / course
Electronics Engineering
Supervisors
Examiners
Available from: 2014-09-12 Created: 2014-09-01 Last updated: 2014-09-12Bibliographically approved

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Electrical Engineering, Electronic Engineering, Information Engineering

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