Magnetics Business & Technology - January/February 2024 - 10

FEATURE ARTICLE
Continued from page 9...
It can be applied to transformers and chokes, and as a multigap
core solution with triple-insulated Litz wire. It enables the
creation of cost-effective solutions with maximum power density
thanks to the reduction of core volume around 30%, while overall
size reductions up to 20%. It also minimizes losses and offers
optimal heat dissipation of windings in all type of cooling systems.
The attributes make the approach suitable for magnetic
components in demanding applications such as EV chargers or
resonant converters.
Max Echo Technology of Taiwan
Another component manufacturer coming from overseas will be
Max Echo Technology, based in Taichung, Taiwan. Founded
in 1992, it has been producing electronic components for more
than thirty years. With its factory now located in Taichung Precision
Science Park, the company is committed to the research
and development of magnetic materials, ceramic materials, multilayer
printing and low-temperature co-firing, providing customers
with inductors, magnetic beads, and related magnetic or ceramic
components.
Its product capabilities include inductors, ferrite chip beads,
common mode filters, flexible sintered ferrite sheet and wireless
charging coils. Ferrite, metal alloy and ceramic material can be
designed and manufactured with its capability in precision multilayer
processing. For wire wound products, the company can
manufacture material and ferrite core in-house, enabling the
production of high-quality inductors and related power electronic
components.
See www.maxecho.com.tw.
X-Gap Technology from Prax Power of Barcelona
Prax gives this explanation of
the technology: A gap is a portion
of air inside a magnetic core
path. It is used for two main purposes.
One is energy storage in
inductors or chokes such that
the energy stored in an inductor
depends on current and inductance
factor. A gap or distributed
airgap is commonly needed in cores to store such energy. The
other purpose is for inductance value and tolerance reduction.
Introducing a gap decreases magnetic core permeability, which
reduces its inductance factor. Non-gapped cores inductance tolerance
is around ±25%, while gapped cores can be reduced to
±10%
Main effects generating losses due to high frequency in windings
are, first, skin effect -- an isolated round conductor carrying AC
current generates a concentric alternating magnetic field which
induces Eddy Currents. These currents oppose normal current
flow in the center of the conductor, increasing the effective current
closer to the conductor surface. The overall effect is that
total current flows in a smaller perimetral area. This effect intensifies
as frequency increases. Current flow concentrates in an
equivalent perimetral cylinder at the surface of the conductor.
This cylinder thickness δ is known as skin depth.
Secondly is proximity effect which appears when the distribution
of current in one layer of a winding influences the distribution in
another layer, always in the same winding. Such proximity effect,
therefore, increases winding resistance (Rac).
A third factor is fringing effect which happens when a magnetic
flux near a core airgap bends out. The distance over which
these flux fringes out is basically proportional to the length of the
airgap. One single gap can be split into several smaller gaps,
preserving total volume and length. By doing so, effective permeability
and energy storage capabilities are still the same, but the
flux fringing is significantly reduced.
From Spain, Prax Power will be demonstrating its X-Gap technology
and its capabilities for the development and production
of a wide range of chokes, inductors and transformers. Prax is
headquartered in Barcelona and has its primary manufacturing
site in China.
The company's X-Gap technology is a multi-gap core approach
for transformers and inductors developed in-house to reduce AC
losses in the windings that allows for the creation of cost-effective
solutions for maximum power densities. It allows a large air
gap to be evenly distributed on a toroid to minimize fringing effect
by splitting the gap into smaller gaps. With these evenly distributed
gaps (up to 12 or 15 on a single toroid), losses are reduced
exponentially because of the reduction in winding resistance.
10 Magnetics Business & Technology * January/February 2024
Headquartered in Barcelona, Prax Power's primary production facility
is located in Wuxi, China where it manufactures a broad range
of power electronic components including chokes, inductors and
transformers. See www.prax-power.com.
www.MagneticsMag.com
http://www.maxecho.com.tw http://www.prax-power.com http://www.MagneticsMag.com

Magnetics Business & Technology - January/February 2024

Table of Contents for the Digital Edition of Magnetics Business & Technology - January/February 2024

Contents
Magnetics Business & Technology - January/February 2024 - Cover1
Magnetics Business & Technology - January/February 2024 - Cover2
Magnetics Business & Technology - January/February 2024 - Contents
Magnetics Business & Technology - January/February 2024 - 4
Magnetics Business & Technology - January/February 2024 - 5
Magnetics Business & Technology - January/February 2024 - 6
Magnetics Business & Technology - January/February 2024 - 7
Magnetics Business & Technology - January/February 2024 - 8
Magnetics Business & Technology - January/February 2024 - 9
Magnetics Business & Technology - January/February 2024 - 10
Magnetics Business & Technology - January/February 2024 - 11
Magnetics Business & Technology - January/February 2024 - 12
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Magnetics Business & Technology - January/February 2024 - Cover3
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