Using High-Frequency Transformers In Switching Power Supply - Miracle Electronics

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Using High-Frequency Transformers In Switching
Power Supply - Miracle Electronics

• There is a rising urge of electronics usage in
  the market today (https//www.miracle.net.in/blog
  /power- transformer-market-present-future/), whic
  h has been driven by a steady stream of design
  innovation. Industrial and consumer markets expec
  t new product iteration to provide enhanced
  performance and increased functionality, packed
  into a smaller size. To be able to satisfy all
  these capabilities, it is important that
  components are chosen very carefully so that they
  can provide optimal performance and value to
  end-users. It is important to understand how
  each component used can have an effect on the
  ultimate performance of the design.

What are high-frequency transformers? High-frequen
cy transformers operate using the same principles
as standard transformers, with the only main
difference being that they operate at much
higher frequencies. Where normal transformers
operate at 50-60 Hz, high-frequency transformers
operate between 20 KHz and 1 MHz. One main
benefit of using
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high-frequency transformers is that they are
smaller in size. The higher the frequency, the
smaller the transformer size. And, because the
size is smaller, the copper wire used is also
less, thus reducing the losses, and helping the
transformer become more efficient. The
challenges However, the small size, lesser
weight, and higher power desnity also poses a
number of challenges. One such issue is
minimizing skin and proximity effects. Skin
effects are caused by the tendency of high
frequency currents to flow on the surface of the
conductors. The losses due to skin effect can be
reduced through the use of Litz wires, which are
constructed by weaving multiple smaller
conductors together to make an equivalent larger
wire gauge. The size of each individual strand
is determined by the intended operating
frequency, with smaller strands being used for
higher frequencies. The weaving process enables
each strand to occupy a space near the skin of
the Litz wire at some point in the length of the
wire, allowing the current to flow more evenly
through all the strands. Proximity effects are
caused by magnetic fields from adjacent
conductors, either in adjacent windings or in
adjacent layers, which causes the current to
flow in unintended patterns or in eddy currents.
This creates excessive resistance within the
wire, and unintentional power loss. To minimize
proximity effects, selecting a core that allows
an increased number of turns or layers can help
or you can use foil winding layers, rather than
round wires. To minimize the losses caused by
core gaps, multiple gaps on the core
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leg can be used in a way that each gap is
smaller or you can use a physical barrier like
tape to keep the winding away from the gap. The
topologies The efficiency delivered by an SMPS
transformer is critical for modern electronics,
and has facilitated the development of a large
number of topologies to meet many design
requirements. Some of these include buck, boost,
buck-boost flyback, forward, and push- pull.
High frequency SMPS transformers are
high-efficiency and high-robust power-mode
transformers, which are used mainly in
electronic and communication devices,
predominantly in power management chip LDO power
supplies, 1.8v logic circuits, RF circuits, and
external loads. High frequency SMPS transformers
are used in high-frequency inverters and
high-frequency inverter welding machine. The
main function of such high-frequency
transformers is the transfer of energy or storage
of energy, depending upon the operating mode of
the switching power supply. Miracle Electronics
specializes in manufacturing and designing
various high-frequency transformers, one of them
being the SMPS transformer, each being of high
quality, making us the most respected SMPS
transformer manufacturer in India. For more
Information https//www.miracle.net.in/