Ferrite cores are dense, homogeneous ceramic structures composed of iron oxide (Fe2O3) mixed with oxides or carbonates of one or more metals such as manganese, zinc, nickel, or magnesium.

1. Learn More about
Ferrite Cores

2. Overview
Ferrite cores are dense, homogeneous ceramic structures composed of iron oxide
(Fe2O3) mixed with oxides or carbonates of one or more metals such as
manganese, zinc, nickel, or magnesium. They are pressed, then fired in a kiln to
1300o C before being machined to meet various operational requirements.
Because of their high electrical resistivity and low eddy current losses over a wide
frequency range, ferrites have an advantage over other types of magnetic
materials. These properties, combined with high permeability, make ferrite ideal for
use in high frequency transformers, wide band transformers, adjustable inductors,
and other high frequency circuitry starting at 10 kHz to 50kHz.

3. Importance of permeability in power
materials?
Permeability is calculated as flux density (B) divided by drive level (H). Power
materials are typically used in high frequency transformer applications; thus, high
flux density and/or low core losses are important characteristics. Permeability is
less important due to its variability across an operating flux range.

4. Disaccommodation
Disaccommodation occurs in ferrites and is defined as a decrease in permeability
over time after a core has been demagnetized. This demagnetization can be
caused by heating above the Curie point with a decreasing amplitude alternating
current or by mechanically shocking the core. The permeability increases towards
its original value in this phenomenon, then begins to decrease exponentially. If no
extreme conditions are expected in the application, permeability changes will be
minor because the majority of the change will have occurred within the first few
months of the core's manufacture. The decrease in permeability is accelerated by
high temperatures.

5. Difference between nickel-zinc and
manganese-zinc ferrites
The permeability of MnZn materials is high, whereas that of NiZn ferrites is low.
Manganese-zinc ferrites are used in applications with a frequency of operation less
than 5 MHz. Nickel-zinc ferrites have a higher resistivity and are used at
frequencies ranging from 2 MHz to hundreds of megahertz. The exception is
common mode inductors, where the impedance of MnZn material makes it the best
choice up to 70 MHz and NiZn from 70 MHz to several hundred GHz.

6. Ferrite Applications
Ferrite cores have two broad applications that differ in size and frequency of operation: signal
transformers (small size and higher frequencies) and power transformers (large size and lower
frequencies). Cores can also be classified based on their shape, such as toroidal, shell, or cylindrical
cores.
Power transformer ferrite cores operate in the low frequency range (1 to 200 kHz[2]) and are fairly
large in size. They can be toroidal, shell, or shaped like the letters ‘C', ‘D', or ‘E'. They are useful in
all types of electronic switching devices, particularly power supplies ranging from 1 Watt to 1000
Watts. because more powerful applications are usually beyond the capabilities of ferritic single
cores and necessitate grain oriented laminated cores
The ferrite cores used for signals have applications ranging from 1 kHz to many MHz, possibly as
much as 300 MHz, and have found their primary application in electronics, such as AM radios and
RFID tags.

7. Ferrite Applications(Properties, materials
and shapes)
Applications Desired Properties Preferred Materials Available Shapes
Broadband Transformers
Low loss, High µ (permeability), Good
frequency response J, W, M*
Pot cores, Toroids, E, U & I cores,
RM, EP cores
Common Mode Chokes Very high µ J, W, M* Toroids, E cores
Converter and Inverter
Transformers Low losses, High saturation F, L, P, R, T
Toroids, E, U & I cores, Pot cores,
RS cores, Planar cores
Differential Mode Inductors
Low losses, High temperature
stability, Good stability across load
conditions F, P, R, T
Gapped pot cores, EP cores, E
cores, RM cores, Planar cores, PQ
cores
Narrow Band Transformers Moderate Q, High µ, High stability F, J
Pot cores, Toroids, RM cores, EP
cores

8. Continued….
Applications Desired Properties Preferred Materials Available Shapes
Noise Filters High µ, Good frequency response J, W, M Toroids
Power Inductors
Low losses at high flux densities and
temperatures, High saturation, Good
stability across load conditions F, L, P, R
Pot cores, E cores, PQ cores, RM cores,
Planar cores
Power Transformers
High µ and low losses at high flux
densities and temperatures, High
saturation, Low exciting currents F, L, P, R, T
Ungapped pot cores, E, U & I cores,
Toroids, EP cores, RS cores, DS cores,
PQ cores, Planar cores
Pulse Transformers High µ, Low loss, High B saturation J, W, M Toroids
Telecom Inductors
Low losses, High temperature stability,
Good stability across load conditions F, P, R, T
Pot cores, EP cores, E cores, RM cores,
Planar cores

9. Address:
Cosmo Ferrites Limited,
517, 5th Floor, DLF Tower-A,
Jasola
New District Centre, Jasola,
New Delhi - 110025. India.
● Export Enquiry +919218580680
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