Co-Based Amorphous Core of Transformer Used for High Power Switching Regulator

Masato MINO  Toshiaki YACHI  Yasuo OHASHI  

IEICE TRANSACTIONS (1976-1990)   Vol.E73   No.9   pp.1468-1472
Publication Date: 1990/09/25
Online ISSN: 
Print ISSN: 0000-0000
Type of Manuscript: Special Section PAPER (Special Issue on Switched-Mode Power Supplies for Electronics)

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A new transformer with a Co-based amorphous core for use in the switching regulators of telecommunications systems is described. This transformer in fabricated by a two-step magnetic field annealing technique to decrease core loss. It is shown that this amorphous core reduces loss to 1/2 that of a conventional ferrite core. It is also shown that the weight and size of the new transformer are 3/5 and 1/2 those of a conventional transformer using the ferrite core. A 100 kHz series resonant converter with this transformer is 93% efficient with an output power level of 50% to 100%.