Analysis of Modular DCM Flyback Converters in Input Parallel Connections with Parametric Mismatches

Vinícius B. Fuerback; Matheus S. Dall’Asta; Mauro André Pagliosa; Telles B. Lazzarin

doi:10.18618/REP.2019.2.0052

Authors

Vinícius B. Fuerback Power Electronics Institute (INEP-UFSC), Federal University of Santa Catarina, Florianópolis, SC - Brazil
Matheus S. Dall’Asta Power Electronics Institute (INEP-UFSC), Federal University of Santa Catarina, Florianópolis, SC - Brazil
Mauro André Pagliosa Federal Institute of Education, Science and Technology Catarinense (UFSC), Luzerna, SC - Brazil
Telles B. Lazzarin Power Electronics Institute (INEP-UFSC), Federal University of Santa Catarina, Florianópolis, SC - Brazil

DOI:

https://doi.org/10.18618/REP.2019.2.0052

Keywords:

Flyback, IPOP, IPOS, Modular

Abstract

This paper analyzes the effects of parameter mismatches in the balance mechanism of modular DC-DC Flyback converters operating in discontinuous conduction mode. The natural current and voltage distributions among modules are evaluated when mismatches on duty cycles, transformer magnetizing inductances and transform turns ratios are present. From these results, the critical values of inductances and duty cycles that assure the discontinuous operation are equated. The small-signal equivalent circuit for Input-Parallel-Output-Series and Input-Parallel-Output-Parallel connections are found, followed by a simple control strategy. The theoretical analysis is verified by experimental results obtained with a prototype composed of three 200 W Flyback modules, with a rated power of 600 W and maximum efficiency of 95.5%. Results corroborate the proposed equations for the steady state balance and dynamic behavior of both connections, highlighting the modular characteristic of the converter.

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Author Biographies

Vinícius B. Fuerback, Power Electronics Institute (INEP-UFSC), Federal University of Santa Catarina, Florianópolis, SC - Brazil

born in 1992 in Cunha Porã, SC, Bachelor of Electrical Engineering from the Federal University of Santa Catarina (UFSC), SC, Florianópolis, Brazil (2017). He is currently studying for his Master’s Degree at the Federal University of Santa Catarina.

Matheus S. Dall’Asta, Power Electronics Institute (INEP-UFSC), Federal University of Santa Catarina, Florianópolis, SC - Brazil

born in 1993 in Curitibanos, SC, Bachelor of Electrical Engineering from the Federal University of Santa Catarina (UFSC), SC, Florianópolis, Brazil (2017). He is currently studying for his Master’s Degree at the Federal University of Santa Catarina.

Mauro André Pagliosa, Federal Institute of Education, Science and Technology Catarinense (UFSC), Luzerna, SC - Brazil

born in 1979 in Bela Vista, MS, is an electrical engineer (2002), master (2005) and doctor in Electrical Engineer (2018) from the Federal University of Santa Catarina (UFSC), Florianópolis, Brazil. He is currently a full professor at the Federal Institute Catarinense, Luzerna, SC.

Telles B. Lazzarin, Power Electronics Institute (INEP-UFSC), Federal University of Santa Catarina, Florianópolis, SC - Brazil

born in 1979 in Criciúma, SC, is an electrical engineer (2004), master (2006) and doctor in Electrical Engineer (2010) from the Federal University of Santa Catarina (UFSC), Florianópolis, Brazil. He was awarded for one year Post-Doctoral Scholarship (July 2017 to July 2018), working as a researcher guest of the Power Electronics Research Group at Northeastern University. He is currently a full professor at the Federal University of Santa Catarina. Dr. Lazzarin is a member of the SOBRAEP and IEEE.

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