70053K Datasheet, PDF (9/28 Pages) List of Unclassifed Manufacturers – THE ADVANTAGES AND BENEFITS OF USING AMVECO TOROIDAL TRANSFORMERS

TECHNICAL AND APPLICATION NOTES (CONTINUED)
TEMPERATURE RISE CONSIDERATIONS
Total losses for the transformer, including winding losses and core loss at a
given flux level, may be calculated from design data and data furnished by
steel suppliers.
At AMVECO, our toroids are ordinarily designed to render a 60˚C to 65˚C
temperature rise. The graph below illustrates the rise in transformer
temperature as the actual power approaches and then exceeds the
transformer’s nominal power rating. Careful consideration must be given
to the expected load conditions.
REGULATION
The load regulation of toroidal power transformers is expressed by the
following equation:
%Reg = [(Eoc - Efl) / Eoc ] x 100
Efl
= Full load voltage
Eoc
= No-Load
Regulation may be improved by using larger diameter wire in the wind-
ings or a larger core. This technique is accompanied by a slight increase
in size and cost.
Voltage
Drop (%)
STRAY FIELD DATA
TOROID EFFICIENCY
The following graph illustrates the effect of increasing load on the effi-
ciency of a toroid for various power ratings.
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AMVECO Magnetics, Inc. • 10401 Westoffice Dr. • Houston, TX 77042 • [phone] • [phone] • Fax: [phone] • Email: [e-mail] • www.amveco.com