Ferrite Cores
Ferrite Cores, Soft Ferrite Core, EMI, SMD, MnZn ferrite core, NiZn, Magnetic Powder Core, Amorphous Core, Nanocrystalline Cores, Various Styles Ferrite Cores for TRANSFORMER and INDUCTOR, ferrite cores China supplier
Ferrite Cores – Ferrites are polycrystalline oxides manufactured by ceramic technology and belong to a class of materials that exhibit the technically useful property of ferromagnetism. In a ferromagnetic material, magnetism occurs under the influence of an externally applied field. On removals of this field, material returns to its non-magnetic state. This behaviour is termed as magnetically “soft”.
The general composition of these soft ferrites is MeFe2O4, where Me represents one or several of the divalent transition metals such as Manganese (Mn), Zinc (Zn), Nickel (Ni), Copper (Cu), Iron (Fe) or Magnesium (Mg), the most popular being Manganese-Zinc (Mn-Zn) and Nickel-Zinc (Ni-Zn) ferrites. These compounds exhibit good magnetic properties below a certain temperature called the Curie Temp (Tc). These materials can be used up to very high frequencies without laminating. Ni-Zn ferrites have a very high receptivity and are most suitable for frequencies over 1 MHz however Mn-Zn ferrites exhibit higher permeability and saturation induction levels and are suitable up to 3 MHz.
In electronics, a ferrite core is a type of magnetic core made of ferrite on which the windings of electric transformers and other wound components such as inductors are formed. It is used for its properties of high magnetic permeability coupled with low electrical conductivity (which helps prevent eddy currents). Because of their comparatively low losses at high frequencies, they are extensively used in the cores of RF transformers and inductors in applications such as switched-mode power supplies, and ferrite loopstick antennas for AM radio receivers.
Ferrites are ceramic compounds of the transition metals with oxygen, which are ferrimagnetic but nonconductive. Ferrites that are used in transformer or electromagnetic cores contain iron oxides combined with nickel, zinc, and/or manganese compounds. They have a low coercivity and are called “soft ferrites” to distinguish them from “hard ferrites”, which have a high coercivity and are used to make ferrite magnets. The low coercivity means the material’s magnetization can easily reverse direction while dissipating very little energy (hysteresis losses), at the same time the material’s high resistivity prevents eddy currents in the core, another source of energy loss. The most common soft ferrites are:
Manganese-zinc ferrite (MnZn, with the formula MnaZn(1−a)Fe2O4). MnZn have higher permeability and saturation levels than NiZn.
Nickel-zinc ferrite (NiZn, with the formula NiaZn(1−a)Fe2O4). NiZn ferrites exhibit higher resistivity than MnZn, and are therefore more suitable for frequencies above 1 MHz.
For applications below 5 MHz, MnZn ferrites are used; above that, NiZn is the usual choice. The exception is with common mode inductors, where the threshold of choice is at 70 MHz.
As any given blend has a trade off of maximum usable frequency, versus a higher mu value, within each of these sub-groups manufacturers produce a wide range materials for different applications blended to give either a high initial (low frequency) inductance, or lower inductance and higher maximum frequency, or for interference suppression ferrites, a very wide frequency range, but often with a very high loss factor (low Q).
It is important to select the right material for the application, as the correct ferrite for a 100 kHz switching supply (high inductance, low loss, low frequency) is quite different from that for an RF transformer or ferrite rod antenna, (high frequency, low loss, but lower inductance), and different again from a suppression ferrite (high loss, broadband)
Applications
There are two broad applications for ferrite cores which differ in size and frequency of operation: signal transformers, which are of small size and higher frequencies, and power transformers, which are of large size and lower frequencies. Cores can also be classified by shape, such as toroidal cores, shell cores or cylindrical cores.
The ferrite cores used for power transformers work in the low frequency range (1 to 200 kHz usually[2]) and are fairly large in size, can be toroidal, shell, or shaped like the letters ‘C’, ‘D’, or ‘E’. They are useful in all kinds of electronic switching devices – especially power supplies from 1 Watt to 1000 Watts maximum, since more powerful applications are usually out of range of ferritic single core and require grain oriented lamination cores.
The ferrite cores used for signals have a range of applications from 1 kHz to many MHz, perhaps as much as 300 MHz, and have found their main application in electronics, such as in AM radios and RFID tags.
MPCO offers its customers a wide range of soft ferrites for application:
Lighting
Electronic Ballast for energy efficient Lamps viz CFL, LED
Electronics Chokes for Tubular Lamps
List of Category
E Cores
EFD (EFF) Cores
EP Cores
EPC (EFC) Cores
ER Cores
ETD Cores
I Cores
Planar Cores
POT Cores
PQ Cores
PTS Cores
RM Cores
ROD Cores
Toroid (Ring) Cores
U Cores
UR Cores
Power Conditioning
UPS/Inverter transformers
Welding transformers
Switch Mode Power Supplies
Medical Electronics
Telecom Power supplies
Induction Heating Applications
List of Category
E Cores
EC Cores
EFD (EFF) Cores
EI Cores
EPC (EFC) Cores
ER Cores
ETD Cores
EV Cores
Planar Cores
Planar Cores
PM Cores
PQ Cores
RM Cores
ROD Cores
Toroid (Ring) Cores
U Cores
UR Cores
EMI Filters/ Chokers/ Sensors
EMI/EMC Chokes
Energy Meters
List of Category
EI Cores
EP Cores
ET Cores
Planar Cores
POT Cores
PTS Cores
ROD Cores
Toroid (Ring) Cores
U Cores
UR Cores
UT Cores
Solar
List of Category
E Cores
ER Cores
PM Cores
PQ Cores
RM Cores
Toroid (Ring) Cores
Automotive
EMI EMC Suppressions
Sensors
List of Category
E Cores
I Cores
Planar Cores
PM Cores
PQ Cores
RM Cores
Toroid (Ring) Cores
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