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High frequency dc/dc power converter with galvanic isolation
Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
2016 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Resource type
Text
Abstract [en]

There is a steady demand to increase the efficiency and raise the power density of power converters. This trend is desired since it leads to reduced size of the converter.

The purpose of this thesis is to investigate materials, topologies, core structure and then build a prototype to demonstrate the result. Two core materials have been compared, Fair-Rite material 68 and Ferroxcube 4F1. The goal was to have 50 V input and 30 V output with 80 % efficiency of the converter.

The converter with the Fair-Rite material 68 accomplished a peak efficiency at 11 MHz with 54 % efficiency. The core material Ferroxcube 4F1, reached an efficiency of 52 % at 7 MHz. These results were however with 5 V input and 3 V output. The converter had a low efficiency at 50 V input, which lead to ripple in the circuit. One reason for this behaviour was because the design of the PCB was not optimized for MHz operation. The focus of the PCB was that it should be easy to work with instead of achieving peak performance. Also, from the beginning it was decided that no PCB should be made. The focus was instead on the theory and simulations of the converter so no thoroughly investigation of PCB design was done.

The leakage inductance of the transformer core was about 10 % of the primary inductance for both materials. The high leakage inductance is believed to further reduce the efficiency of the converter.

Place, publisher, year, edition, pages
2016. , 56 p.
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:liu:diva-128831ISRN: LiU-ITN-TEK-A-16/009--SEOAI: oai:DiVA.org:liu-128831DiVA: diva2:932440
Subject / course
Electrical Engineering
Uppsok
Technology
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Examiners
Available from: 2016-06-01 Created: 2016-06-01 Last updated: 2016-06-01Bibliographically approved

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fulltext(1569 kB)287 downloads
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CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf