SMPS Transformers are efficient transformers used in switch mode power supplies to transfer power to commercial and industrial electronic networks. They are usually preferred because of their ability to provide a regulated output voltage to electrical networks. https://www.cosmoferrites.com/news-events/selecting-the-perfect-magnetic-cores-for-smps-transformers

1. Selecting The Perfect Magnetic Cores For
SMPS Transformers

2. Overview
Switch mode power supply (SMPS) employ efficient transformers to deliver power to commercial and
industrial electronic networks. They are typically favoured because of their capacity to offer electrical
networks with a controlled output voltage. Choosing the proper sort of magnetic cores while developing
these transformers is critical to ensuring their performance. The selection of these cores is determined by
three transformer characteristics: power needs, frequency, and switching topology.
In this article, we will look at SMPS transformers, their many types, and how to choose the best core
material for them.
2

3. HELLO!
I am Rahul Pal
I am here because I love to give presentations.
You can find me at @cosmoferrites
3

4. What are SMPS
Transformers?
Let’s start with the short about SMPS
Transformers
1 4

5. “
SMPS transformers convert alternating current
(AC) mains electricity to direct current (DC) output
voltage. When the power is turned on, the
alternating current is filtered by a capacitor and
transformed from alternating current voltage to
unregulated direct current voltage.
5

6. Common applications of SMPS transformers are:
◉ Power sourcing equipment
◉ Communication devices
◉ Medical devices
◉ Commercial power supplies
◉ Audio-visual products
◉ Security systems
The SMPS transformer converts the unregulated DC Voltage into
regulated DC voltage at varying voltage levels using a regulator.
.
6

7. Types of SMPS Transformer
◉ Isolated Transformer
◉ Non-Isolated Transformer
7

8. 1. Isolated Transformer
Isolated SMPS transformers are ones
that are separated from the rest of
the circuit that they power. They are
used to distinguish between
switches and output. The secondary
winding of this SMPS aids in energy
storage. They are classified into two
types:
◉ Forward Converter
◉ Flyback Converter
2. Non-Isolated Transformer
Non-Isolated SMPS transformers do not
have isolated input and output circuitry.
When there is a little shift in voltage
levels, they are recommended. As a DC-
DC Converter, they assist in stepping up
or stepping down voltages. They are
classified into three types:
◉ Bucks Converter (Step-Down)
◉ Boost Converter (Step-Up)
◉ Buck-Boost (Step-Down/Step-Up)
Converter
8

9. How to select ideal cores for SMPS Transformers?
#1 Core Type
Choosing the proper sort of magnetic
cores while developing these
transformers is critical to ensuring their
performance. The selection of these cores
is determined by three properties of the
transformers:
◉ Power necessities
◉ Frequency
◉ Topology of Switching
#2 Core Shape
To reduce core losses in the high-
frequency SMPS transformer, you
must choose the right core shape.
Along with this, the window
configuration is an important factor to
consider in the core forms.
◉ EFD & EPC cores
◉ EE & EF cores
◉ ETD & EER cores
◉ PQ cores & POT Cores
9

10. Continued…
#3 Core Size
Another critical issue is selecting the
appropriate core size for your SMPS
transformer design.
The core area is calculated by multiplying
the core cross-section area by the
winding window area. This approach is
used to estimate the core size of an
application at the beginning.
#4 Core Losses
Core losses in transformers arise as a
result of alternating magnetic flux in
the core. When this occurs, the
operational flux density must be
determined in order to calculate the
core loss.
For the transformer to work
efficiently, losses must be kept to a
minimum.
10

11. Conclusion
A proper selection of the right magnetic cores will help you ensure less heat
generation, less power wastage, and enhance the efficiency of your SMPS
transformer.
11

12. Address:
Cosmo Ferrites Limited,
517, 5th Floor, DLF Tower-A, Jasola
New District Centre, Jasola,
New Delhi - 110025. India.
● Export Enquiry +919218580680
Get Social
https://www.facebook.com/cosmoferritesltd/
https://twitter.com/Cosmo_ferrites
https://in.linkedin.com/company/cosmo-
ferrites-limited
Reach US
Thank You
www.cosmoferrites.com