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Konstruktion av en galvaniskt isolerad flyback-omvandlare
Linköping University, Department of Electrical Engineering, Electronics and Computer Engineering.
2026 (Swedish)Independent thesis Basic level (university diploma), 14 HE creditsStudent thesis
Abstract [sv]

En 5 W flyback-omvandlare med två justerbara utspänningar på 5–12 V har konstruerats. Konstruktionen drivs i diskontinuerligt ledningsläge (DCM) med en växlingsfrekvens på 200 kHz. En strömstyrd styrkrets med återkoppling användes via en spänningsreferens (TL431) och en optokopplare. För att validera de gjorda designvalen har kretsen först simulerats, och vidare har en prototyp byggts. Mätningar på prototypen användes för att förbättra slutprodukten. Resulterande verkningsgrad är uppmätt till cirka 87 %, vilket anses som acceptabelt för en lågeffektsapplikation. En del tester har medvetet avgränsats. För att säkerställa att slutprodukten fortsätter hålla en hög kvalitet oavsett förhållande finns behov för ytterligare tester.

Abstract [en]

A 5 W flyback converter with multiple adjustable voltage outputs in the 5–12 V range has been constructed. The converter has a switching frequency of 200 kHz and operates in discontinuous-conduction mode (DCM). A current mode PWM controller has been used, with feedback delivered using a voltage reference (TL431) and an optocoupler. Simulations have been carried out to validate the design choices and further development of a prototype. The prototype has been measured and an improved final product has been developed. The resulting efficiency was measured to approximately 87 %, which is considered an acceptable result for such a low power converter. Some tests have deliberately been left out. To ensure that the final product will continue to deliver no matter condition, some additional testing might be required.

Place, publisher, year, edition, pages
2026. , p. 46
Keywords [sv]
Effektelektronik, DC/DC-omvandlare, Flyback
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:liu:diva-220712ISRN: LiTH-ISY-EX-ET--25/0547--SEOAI: oai:DiVA.org:liu-220712DiVA, id: diva2:2031903
External cooperation
Flex Power Modules AB
Subject / course
Integrated Circuits and Systems
Presentation
2026-01-16, Systemet, Linköpings universitet, Linköping, 11:00 (Swedish)
Supervisors
Examiners
Available from: 2026-01-26 Created: 2026-01-25 Last updated: 2026-01-26Bibliographically approved

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flyback_converter(16970 kB)25 downloads
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99382c2705e188c8977eb724415ed473d52e7a080876afdc51ad34fd77895f5e35e1af56fb47231eb7ff36a9275404d8e00aec514076d6941ea67f8c11054c7a
Type fulltextMimetype application/pdf

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CiteExportLink to record
Permanent link

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Citation style
  • apa
  • 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