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Multilayered transformer utilizing Mn‐Zn ferrite and its application to a forward‐type DC–DC converter
Author(s) -
Sato Toshiro,
Yokoyama Hironori,
Yamasawa Kiyohito,
Toya Kazumi,
Kobayashi Shigeru,
Minamisawa Toshitaka
Publication year - 2001
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/eej.1036
Subject(s) - transformer , forward converter , materials science , ferrite core , coupling coefficient of resonators , delta wye transformer , electrical engineering , rotary variable differential transformer , distribution transformer , linear variable differential transformer , finite element method , voltage , electromagnetic coil , engineering , optoelectronics , structural engineering , boost converter , resonator
Abstract This paper describes the electrical characteristics of a multilayered transformer composed of a Mn‐Zn ferrite core, and primary and secondary conductors positioned alternately not only in the vertical direction but also in the horizontal direction. In order to elucidate the operating characteristics of the two types of transformers, one was given the conventional planar winding structure and the other the new winding structure described above, and a two‐dimensional finite element method that took account of the two conditions and a constant input voltage and load current was introduced. The coupling coefficient of the conventional multilayered transformer deteriorated with increasing load current. But the coupling coefficient of the proposed multilayered transformer was independent of the load current. A forward‐type DC–DC converter using the new multilayered transformer had higher efficiency than a converter using the conventional multilayered transformer. © 2001 Scripta Technica, Electr Eng Jpn, 135(4): 1–8, 2001