Working Functions of Ferrite core and Magnetic Core
Generally, the ferrite cores has combined with manganese zinc ferrites that means an oxide form from Iron (Fe), Manganese (Mn) and Zinc (Zn). These ferrite cores is having low coercivity so this called as soft magnetic ferrites due to low losses may occur at high frequencies that is considerable usage in the SMPS and radio transformers and inductors. Ferrite cores is applied in high quality communication market standard and high frequency power supply that made in different structures and sizes for transformers, inductors and noise filters. The major features of ferrite material are flux density is separated by drive level, the power materials is commonly used for high frequency application standard so it having high flux density and low losses. The flux density is may varied based on its flux range. good temperature attributes and low
When the flux density is reduced with core has demagnetized the disaccommodation may occur after that time. The demagnetization is may occur due to heating across the curie point level by associated an AC current of compressing the amplitude. This event may occur the flux density is rise over the default value, then it will initiate to diminishing exponentially. If the application is not require the extreme level, flux density will changing small due to the transformation is almost happening after produce the core. When the high temperature is boosted the flux density is decreases. The disaccomodation is routinely followed in every demagnetization that is not same as aging.
The core losses is may calculating, it has predicted the size has identically. Gap losses are occur due to flux concentration in the core and eddy current is produced in the windings. The gap loss is extremely hiked overall losses if core is gapped. Moreover, many core geometries cross-sectional area is varying, local “hot spots” can proceed at points of low-level cross section. This is enhanced the permeability at the local areas which output has maximum losses at those points.
The different types of ferrite materials are available but familiar type of ferrites are nickel-zinc ferrite and manganese-zinc ferrite. Manganese Zinc is having maximal flux density and its functional frequency range is less than 5MHz but excluded common mode inductors that impedance is good option up to 70MHz. the Nickel zinc ferrite having minimal flux density during manganese-zinc is higher. Then nickel-zinc ferrite is having high resistivity so it has functional frequency ranges from 2 MHz to some hundreds Mhz. impedance of nickel-zinc from 70Mhz to some hundred MHz.
Iron powder core is one of the magnetic core that carried conventional manufacturing, after the unmixed powder and it would be a minimal cost of core materials. This consisting ferrite is more than 99% surface insulation coating and then combined push with organic binder due to its not able to conducting in the high temperature. The powder is collapsed with drastically high pressures to generate solidlooking core that mode has generate a magnetic shape with a shared air gap. The essential high saturated permeability of iron coupled with shared air gap generated a core material with starting flux density no more than 100 and maximal energy storing capacity. Therefore its used temperature ranges from -65C to 125C. The iron powder cores are used SMPS, High Q Inductors, RFower applications. Iron core powder is best option for different inductors application but it has not suitable for switching transformer. The conventional functions is used to generate iron powder cores and create a many set of configuration. Different kinds of cores are obtainable in iron powder such as toroidal core, E-core, U core, Slugs, and Bus-Bar cores. This type of core is having option to give height variations of previous model sizes through pressing conversion without help of respective tools and it is partially cheap to own tool a special structure or size. This powder can make tight tolerance level both physical and electrical sections.
The bobbin or coil former transformer is the center part of the transformer, which is handle the winding and termination platform. The bobbin is assist the winding, aligns the cores, channels the winding and extracted a removing and connecting method. Every bobbin is developed for using with certain core shape in the ferrite core or tape wound. Different ideas have been available to design a transformer but the best option is combination of best bobbin and core. The major consideration of bobbin is cost of the product, availability, limitation of material, safety agency parameters and easy method of production. The core orientation and geometry has explored who designed the bobbin. The coil formers has mounted two ways as vertical and horizontal, which vertical bobbin occupied small board space but it has height than horizontal bobbin and wire termination is complicated than horizontal bobbin then its take more board space. Horizontal mount bobbins is occupied more space but less height and simple wire termination and available the lot of multi-section types. Next I considered to packing and shipment to the spot of p.c board insertion. If magnetic devices are vulnerable to statically discharge other component may be inserted at the same spot. It is suggested that convention be packaged in antistatic tubes that also protected shipments. Bobbin termination is major discussion due to combined with transformer and inductors in a circuit. the bobbin terminal cost is higher than the without terminal. Although, bobbins with terminals has enhanced the production and easily inserting the p.c board but terminal size and structures may varied based on the actual size of the using winding wire then surface mount would be evaluated. In reality all bobbins are having through-hole terminals, but only chose smaller core. These may mainly did to the weight of the convention and its drawbacks is get and placing the equipment.
Jaya karthick - About the Author:
This is Jaya Karthick,I Have intersted in writing articles about machinery like
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