Effects of secondary leakage inductance on the LLC resonant converter - Part II: Frequency control bandwidth with respect to load variation

Mostafa Noah, Tomohide Shirakawa, Kazuhiro Umetani, Jun Imaoka, Masayoshi Yamamoto, Eiji Hiraki

研究成果: Conference contribution

10 被引用数 (Scopus)

抄録

Resonant converters rely on a precise knowledge of leakage inductance of the equipped transformers. Resonant circuit topologies such as LLC usually utilize the transformer leakage as an inductive component in the resonant tank, allowing for a drastic reduction in the converter weight, size and volume. The existence of the secondary leakage inductance affects the whole operation of the LLC resonant converter. This paper reveals that placing the secondary winding near the air gap would increase the resonant tank input impedance, vertically shrink the voltage-gain curve of the converter, and consequently minimize the frequency range (i.e frequency bandwidth with respect to load variation). On contrary, placing the secondary winding in a close contact with the magnetic core would decrease the resonant tank input impedance, vertically stretches the voltage-gain curve of the converter, and widen the frequency variation range. It has been reported that the winding location with respect to the air gap has an impact on the leakage inductance value. In other words, placing the secondary winding in a close contact with the magnetic core (zero mmf position) would maximize the leakage energy storage originated from the secondary winding, and hence maximize the secondary leakage inductance and vice versa. The theoretical discussion is presented which is merely based on Ampere's law and Dowell's model. Furthermore, transformer prototypes had been constructed and tested in a 390V/12V-220W LLC converter prototype to evaluate the proposed analysis.

本文言語English
ホスト出版物のタイトル34th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2019
出版社Institute of Electrical and Electronics Engineers Inc.
ページ1408-1414
ページ数7
ISBN(電子版)9781538683309
DOI
出版ステータスPublished - 2019 5月 24
外部発表はい
イベント34th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2019 - Anaheim, United States
継続期間: 2019 3月 172019 3月 21

出版物シリーズ

名前Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC
2019-March

Conference

Conference34th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2019
国/地域United States
CityAnaheim
Period19/3/1719/3/21

ASJC Scopus subject areas

  • 電子工学および電気工学

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