Power Design with Ferrite Core for Inductors and Transformers (1)

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Power Design with Ferrite Core for Inductors and
Transformers

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• Power Design Ferrites are the right type of
  material for inductors and transformers as they
  offer twin advantages of low core pricing and low
  core losses. Generally, they are used in the
  frequency of 20 kHz To 3 MHz and in the
  saturating mode which requires low power and
  low-frequency operation. Power Design Ferrites
  are available in a variety of shapes and sizes,
  which makes them ideal for different
  applications.
• The optimal design of a magnetic device with a
  ferrite core for power applications is governed
  by the following two factors-
• Saturation Flux Density
• Allowable Temperature Rise

• www.cosmoferrites.com

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Power Design for Inductors

• Ferrite cores for inductors benefit users with
  low market prices, low losses, self-shielding,
  tolerance for power, flexible shapes, and more
  compared to most other magnetic materials. This
  is possible because ferrites are oxide materials
  and not metals, so they have to bear a dilution
  effect of the large oxygen ions.
• Power materials are the best option to change
  regulators as their temperature and DC aspects
  match up to the required levels. If air gaps are
  added in the designing of the ferrite cores, they
  can prove to be more efficient with no or minimum
  saturation. The right selection of cores that
  support the design of inductors helps in
  switching regulators. When it comes to any
  inductor, usually, the decision of selecting
  materials is taken based on several factors like
  
• Costing
• Winding
• Assembly
• Space efficiency
• Temperature rising and rating, and others

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Power Design for Transformers

While choosing a power transformer design, two
factors must be consideredit should minimize the
core losses and keep the core out of saturation.
Most of the time, ferrite cores and tape wound
cores with high permeability are used for
transformers. Ferrite cores are usually preferred
out of the two because they offer advantages like
low losses, low costs, high permeability, and are
available in a range of sizes and shapes, serving
different purposes. For example, EC cores ensure
minimum winding resistance along with standard
channels while RM Cores increase magnetic
performance and are important for temperature
stability.
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Ferrite Characteristics for Power Application

• High saturation flux density at elevated
  temperature
• Low loss at the operating frequency, high flux
  density elevated temperatures
• Minimum losses in the operating temperature range
  (usually 70C - 100 C)
• High resistivity to minimize the eddy-current
  core loss
• Also, while making the selection of ferrite core
  shapes for high frequency and high power
  applications, the following properties need to be
  checked.
• Adequate flux carrying capability
• Minimization of the winding resistance and
  leakage inductance
• Minimization of thermal resistance
• Good magnetic shielding
• Adequate space for safety isolation
• Simple and low-cost winding, termination and
  assembly
• Lowest cost of power handling capacity per unit
  volume

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Ferrite Core Shapes Applications

1. E, I Cores E, I Cores are slightly
lower-priced than POT Cores and carry the
advantage of simple assembly. However, the cores
do not have a self-shielding quality. Common
applications of these cores include differential,
power and telecom inductor, broadband, and
inverter transformer. 2.EFD/ EFF Core As per the
industry standards, EFD cores are E-shaped,
allowing the maximum utilization of space in
transformers and inductors. These cores are an
accurate choice for compact transformers and
inductor applications. 3. ETD/ EER Core These
cores are less expensive, which makes them a good
choice for transformers or inductors. Common
applications of the ETD/ EER Cores include
differential inductors and power transformers.
4. EC Cores EC Cores have standard channels for
clamping assemblies. Their center post design
ensures a minimum winding resistance in the
cores. Common applications of EC Cores include
differential inductors and power transformers,
and EC printed circuit bobbins. 5. U, I/UR
Cores U-shaped cores are suitable for operating
on a higher power when there are space
constraints or uncommon form factors. They have
long legs that support low leakage inductance and
encourage economical assembly. Common
applications for these cores include power
transformers.
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Continue
6. Planar E Planar I Core Planar E cores are
designed with an adjustable leg length and window
height. On the other hand, I Cores also have a
standard flexible design. So, the combination of
these cores is widely used for making gapped
inductor cores that have a plain surface. Common
applications for these cores include differential
inductors and DC/ DC, AC/DC converter. 7. POT
Core/ PTS POT Cores offer the advantage of
self-shielding, convenience, good temperature,
low losses, and much more. Common applications
for POT/ PTS Cores include broadband and narrow
transformers, and telecom inductors, power
transformers, power inductors, and inductive
switches. 8. PQ Core PQ Cores are commonly used
in power applications. They ensure good stability
across load conditions and maximum inductance
along with simple assembly. The cores are built
in both types, gapped and ungapped. Common
applications for PQ Cores include SMPS and power
inductors. 9. RM Core RM Cores are built to
increase magnetic performance to the fullest. The
cores allow simple tuning adjustments, reduce
losses, and facilitate temperature stability.
Common applications for RM Cores include
differential inductors, power inductors, filter
inductors, telecom inductors, and broadband
transformers. 10. EP Core EP Cores are built-in
round center post shapes to lessen the effect of
air gaps that are formed along the magnetic path.
They have a round leg in the center that helps to
prevent winding losses. Common applications for
EP Cores include differential telecom
inductors, and power transformers.
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Sr. No Ferrite Applications
1 E, I Cores Differential, Power Telecom Inductor, Broadband, Inverter Transformer
2 EFD/EFF core Compact Transformer application
3 ETD core / EER core Differential Inductors and Power Transformers
4 EC Core Differential Inductors and Power Transformers, EC printed circuit bobbins
5 U,I/UR core Power Transformer Application
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6 Planar E Planar I core Differential inductors and DC/DC, AC/DC converter
7 POT CORE/PTS Broadband and narrow transformers and telecom inductors, power transformers, power inductors, Inductive Switches
8 PQ CORE SMPS, Power Inductors
9 RM CORE Differential inductors, power inductors, filter inductors, telecom inductors and broadband transformers
10 EP CORE Differential and telecom inductors and power transformers
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Conclusion

At Cosmo Ferrites, we have a wide range of
ferrite cores available for different
applications. Our products ensure low coercivity
and low losses at high frequencies which is why
they are the best choice for use in transformers
and inductors. Contact us to know more about our
products and services.
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Address
Cosmo Ferrites Limited,
517, 5th Floor, DLF Tower-A, Jasola
New District Centre, Jasola,
New Delhi - 110025. India.
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