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Low-loss cores for power supply magnetic amplifiers are
typically made from
amorphous
or
nanocrystalline
alloys
, such as Metglas 2714A, which provide high permeability and low core loss for efficient high-frequency operation. Other options include high-nickel permalloy alloys and
powder cores
, like Molypermalloy (MPP) and
Kool Mµ®
, that offer a balance of performance and cost for various applications within the power supply.
Amorphous and Nanocrystalline Cores
- Amorphous alloys have a non-crystalline, disordered structure that leads to very low core loss and high permeability.
- Nanocrystalline materials are composed of crystallites a few nanometers in size and offer high permeability, saturation, and extremely low power loss.
- These materials are ideal for high-frequency (100kHz–1MHz) applications like magnetic amplifiers in switch-mode power supplies (SMPS) because they reduce eddy current losses.
Nickel and Cobalt-Based Alloys
- Cobalt-based alloys (e.g., Metglas 2714A) offer exceptional properties for high-frequency SMPS, including high permeability, high squareness, and low coercive force, notes Elna Magnetics .
- Permalloy 80 , a high-nickel alloy, is a cost-effective option for SMPS applications, though it has slightly higher core losses compared to cobalt-based amorphous materials.
Powder Cores
- These cores are excellent for low-loss inductors and come in various materials like Molypermalloy (MPP) and Kool Mµ®, suitable for output inductors, PFC boost inductors, and other high-current, low-ripple applications.
Choosing the Right Core Material
- High-frequency applications benefit most from amorphous and nanocrystalline cores due to their superior low-loss characteristics.
- Lower-frequency applications (< 50 kHz) can be cost-effectively served by Permalloy 80, while high-frequency applications can utilize cobalt-based alloys for their superior characteristics.
- Specific design needs and economic factors play a crucial role in selecting the most suitable core material.
- Core shape also matters, with toroidal shapes offering low EMI and efficient flux paths, though they may be more difficult to wind.
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Magnetics Nanocrystalline Cores for Magnetic Amplifiers
Mag Inc.
https://www.mag-inc.com
› News › August-2023 › Ma...
Mag Inc.
https://www.mag-inc.com
› News › August-2023 › Ma...
Aug 30, 2023
—
Nanocrystalline cores are often used in magnetic amplifiers
due to their unique magnetic properties including high permeability, low coercivity, and low core ...
MAGAMP Square Loop Cores
Proterial America, Ltd.
https://us.proterial.com
› amorphous-nanocrystalline › m...
Proterial America, Ltd.
https://us.proterial.com
› amorphous-nanocrystalline › m...
These cores
have low coercive field and low core losses
. The higher saturation induction of the alloy lends itself to small core size. This alloy is lead-free.
Magnetic Cores For Switching Power Supplies
Elna Magnetics
https://elnamagnetics.com
› library › Magnetics
Elna Magnetics
https://elnamagnetics.com
› library › Magnetics
PDF
The high flux density (10,000 gauss) and
low core loss
makes Kool Mu cores excellent for unidirectional drive applications such as pulse transformers and fly- ...
23 pages
Amorphous Core Manufacturers
Pourleroi
https://www.pourleroi.com
› ... › Amorphous Cores
Pourleroi
https://www.pourleroi.com
› ... › Amorphous Cores
Lower hysteresis loss means that the
magnetic core material has lower energy loss
and can provide higher energy conversion efficiency. What is the ...
Mag Amp Cores and Materials
Vogel Communications Group
https://p7f.vogel.de
› companies › mag-amp-cores...
Vogel Communications Group
https://p7f.vogel.de
› companies › mag-amp-cores...
PDF
Core losses
for 1 mil are much higher, and the 1/2 mil
core losses
are slightly higher than the cobalt based amorphous material. Permalloy cores offer the ...
12 pages
Amorphous Magnetic Parts
Niterra Materials
https://www.niterramaterials.co.jp
› am_parts_mtms
Niterra Materials
https://www.niterramaterials.co.jp
› am_parts_mtms
Our range includes the MT Series, which has outstanding saturability and
low loss
, and the highly versatile MS series. Saturable Cores for Mag Amps. Features.
Low Loss Alloy Transformer Core High Saturation ...
Made-in-China.com
https://hemeict.en.made-in-china.com
› jGSYvCtEEbcB
Made-in-China.com
https://hemeict.en.made-in-china.com
› jGSYvCtEEbcB
It is suitable for consumer electronic equipment such as inverter drives, EV controllers, inverter air-conditioners, LCD TVs, electric ceramic ovens, etc. It is ...
·
Review by MIC_BUYER
Nanocrystalline Core for Magnetic Amplifier China Manufacturer
amorphousoem.com
https://www.amorphousoem.com
› Solid Core
amorphousoem.com
https://www.amorphousoem.com
› Solid Core
Made from Fe–Cu–Nb–Si–B nanocrystalline alloy, these cores offer ultra-high permeability,
low
coercivity, and a rectangular B-H curve.
Magnetic amplifiers
Audio Science Review (ASR) Forum
https://www.audiosciencereview.com
› forum › magnet...
Audio Science Review (ASR) Forum
https://www.audiosciencereview.com
› forum › magnet...
Apr 1, 2022
—
Magnetic amplifiers work by controlling the permeability of a magnetic iron circuit.
They have two low current DC control windings
to alter the permeabilty of ...
Amorphous Magnetic Cores For High Frequency Electronics
Hill Technical Sales
https://www.hilltech.com
› products › amor_cores › amorx
Hill Technical Sales
https://www.hilltech.com
› products › amor_cores › amorx
They offer a unique combination of high saturation induction, high permabiliity and the
lowest core loss
available for high frequency choke cores allowing the ...
