IEEE Power Electronics Magazine - September 2017 - 13

Materials for
Transformers

Figure 2. Clearly, this company had
been thinking about the questions I
wanted to ask before I contacted them.
Figure 2 is highly stylized; the real
information is in the numbers and letters. What is shown is the company's
vision of the evolution of a transformer for use in a 400-W, 48-V-12-V dc-dc
converter, as the switching frequency
has advanced from 2010-2022.
The three columns in the figure
represent three time periods, one in
the past, one in the present, and one

Power Ferrites
Manganese-Zinc
Ferrites
Nickel-Zinc Ferrites
Nanocrystalline
and Amorphous
Strip Materials

Performance Factor (Tesla-Hertz)

One striking feature of
the new wide-bandgap
switches is their far lower
switching loss compared
to the silicon switches
that dominate the
industry today.

Transformer Core Materials Utility
Performance Factor Versus Frequency
(at 100 mW/cm3 Max.)
100,000

10,000
50/50 CoFe
3% SiFe, Magnesil
50% NiFe, Orthonol
80% NiFe, Permalloy
Co Amorphous
MnZn Ferrite
NiZn Ferrite

1,000

100
0.01

0.1

1
10
100
Frequency (kHz)

1,000 10,000

FIG 1 The performance factor versus frequency for different materials. (Image courtesy of Magnetics.)

in the future. The projected advance
in switching frequency with time is
shown by the downward-pointing
arrows above the rising line.
The boxes across the top suggest
that a different ferrite formulation is
called for at each of three snapshots

in time. These are all manganese-iron
ferrites. Each entry in a box is a particular product material designation
for a particular core manufacturer.
Presumably, all the products in a box
are known to be near equivalents.
This change in material is likely driven

We engineer optimally designed

custom magnetics, while offering thousands
of part numbers standard, off the shelf.
We can help you find one that meets your needs today.
and it can be on your desk, tomorrow.
Standard Products

Custom Products

Power
Transformers

Current Sense
Transformers

Wall Plug In
Transformers

Power Supplies
& LED Drivers

Switching Power
Supply

Alternative Energy
Inductor

Audio
Transformers

Inductors
and Chokes

Medical-Grade
Isolated Sources

Medical-Grade LowLeakageTransformers

Power Supply
Precision Toroidal
Transformer

Professional Audio
Impedance Matching
Transformer

Triad Magnetics
460 Harley Knox Blvd, Perris, CA 92571
Tel: 951.277.0757 Fax: 951.277.2757
Email: info@triadmagnetics.com

September 2017

www.triadmagnetics.com

z	IEEE POWER ELECTRONICS MAGAZINE

13



http://www.triadmagnetics.com

Table of Contents for the Digital Edition of IEEE Power Electronics Magazine - September 2017

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