An investigation into a slight-variation of the transformer effective permeability in LLC resonant converter

Mostafa Noah, Shun Endo, Shota Kimura, Masayoshi Yamamoto, Jun Imaoka, Kazuhiro Umetani, Eiji Hiraki

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

In the LLC resonant converter,the transformer core is usually gapped to realize the designed value of magnetizing inductance that allows for soft switching. The air gap length which is in a scale of millimeters may be affected by the humidity and long working hours of the ferrite material, resulting into a variation of the core permeability. Moreover, a slight variation of the transformer core permeability may be encountered with any possible change in the core temperature. In a proper transformer design, the transformer shall operate with an optimum value of effective permeability where the sum of both copper and core losses is minimal. In this paper, the transformer optimal design is presented. Moreover, the influence of the permeability on the transformer's copper and core losses is revealed. Furthermore, with the help of newly derived equations, the effect of the transformer's effective permeability on the LLC converter conduction turn-on and turn-off losses is reported. Along with the theoretical discussion,the analysis is supported with simulation and experimental results utilizing a 250W 200kHz prototype.

Original languageEnglish
Title of host publication2017 19th European Conference on Power Electronics and Applications, EPE 2017 ECCE Europe
PublisherInstitute of Electrical and Electronics Engineers Inc.
Volume2017-January
ISBN (Electronic)9789075815276
DOIs
Publication statusPublished - Nov 6 2017
Event19th European Conference on Power Electronics and Applications, EPE 2017 ECCE Europe - Warsaw, Poland
Duration: Sep 11 2017Sep 14 2017

Other

Other19th European Conference on Power Electronics and Applications, EPE 2017 ECCE Europe
CountryPoland
CityWarsaw
Period9/11/179/14/17

Fingerprint

Copper
Inductance
Ferrite
Atmospheric humidity
Air
Temperature
Optimal design

Keywords

  • Effective permeability
  • LLC resonant converter
  • Power losses
  • Transformer design
  • Turnoff loss

ASJC Scopus subject areas

  • Mechanical Engineering
  • Electrical and Electronic Engineering
  • Energy Engineering and Power Technology

Cite this

Noah, M., Endo, S., Kimura, S., Yamamoto, M., Imaoka, J., Umetani, K., & Hiraki, E. (2017). An investigation into a slight-variation of the transformer effective permeability in LLC resonant converter. In 2017 19th European Conference on Power Electronics and Applications, EPE 2017 ECCE Europe (Vol. 2017-January). [8099301] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.23919/EPE17ECCEEurope.2017.8099301

An investigation into a slight-variation of the transformer effective permeability in LLC resonant converter. / Noah, Mostafa; Endo, Shun; Kimura, Shota; Yamamoto, Masayoshi; Imaoka, Jun; Umetani, Kazuhiro; Hiraki, Eiji.

2017 19th European Conference on Power Electronics and Applications, EPE 2017 ECCE Europe. Vol. 2017-January Institute of Electrical and Electronics Engineers Inc., 2017. 8099301.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Noah, M, Endo, S, Kimura, S, Yamamoto, M, Imaoka, J, Umetani, K & Hiraki, E 2017, An investigation into a slight-variation of the transformer effective permeability in LLC resonant converter. in 2017 19th European Conference on Power Electronics and Applications, EPE 2017 ECCE Europe. vol. 2017-January, 8099301, Institute of Electrical and Electronics Engineers Inc., 19th European Conference on Power Electronics and Applications, EPE 2017 ECCE Europe, Warsaw, Poland, 9/11/17. https://doi.org/10.23919/EPE17ECCEEurope.2017.8099301
Noah M, Endo S, Kimura S, Yamamoto M, Imaoka J, Umetani K et al. An investigation into a slight-variation of the transformer effective permeability in LLC resonant converter. In 2017 19th European Conference on Power Electronics and Applications, EPE 2017 ECCE Europe. Vol. 2017-January. Institute of Electrical and Electronics Engineers Inc. 2017. 8099301 https://doi.org/10.23919/EPE17ECCEEurope.2017.8099301
Noah, Mostafa ; Endo, Shun ; Kimura, Shota ; Yamamoto, Masayoshi ; Imaoka, Jun ; Umetani, Kazuhiro ; Hiraki, Eiji. / An investigation into a slight-variation of the transformer effective permeability in LLC resonant converter. 2017 19th European Conference on Power Electronics and Applications, EPE 2017 ECCE Europe. Vol. 2017-January Institute of Electrical and Electronics Engineers Inc., 2017.
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AU - Umetani, Kazuhiro

AU - Hiraki, Eiji

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N2 - In the LLC resonant converter,the transformer core is usually gapped to realize the designed value of magnetizing inductance that allows for soft switching. The air gap length which is in a scale of millimeters may be affected by the humidity and long working hours of the ferrite material, resulting into a variation of the core permeability. Moreover, a slight variation of the transformer core permeability may be encountered with any possible change in the core temperature. In a proper transformer design, the transformer shall operate with an optimum value of effective permeability where the sum of both copper and core losses is minimal. In this paper, the transformer optimal design is presented. Moreover, the influence of the permeability on the transformer's copper and core losses is revealed. Furthermore, with the help of newly derived equations, the effect of the transformer's effective permeability on the LLC converter conduction turn-on and turn-off losses is reported. Along with the theoretical discussion,the analysis is supported with simulation and experimental results utilizing a 250W 200kHz prototype.

AB - In the LLC resonant converter,the transformer core is usually gapped to realize the designed value of magnetizing inductance that allows for soft switching. The air gap length which is in a scale of millimeters may be affected by the humidity and long working hours of the ferrite material, resulting into a variation of the core permeability. Moreover, a slight variation of the transformer core permeability may be encountered with any possible change in the core temperature. In a proper transformer design, the transformer shall operate with an optimum value of effective permeability where the sum of both copper and core losses is minimal. In this paper, the transformer optimal design is presented. Moreover, the influence of the permeability on the transformer's copper and core losses is revealed. Furthermore, with the help of newly derived equations, the effect of the transformer's effective permeability on the LLC converter conduction turn-on and turn-off losses is reported. Along with the theoretical discussion,the analysis is supported with simulation and experimental results utilizing a 250W 200kHz prototype.

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