High Flux Cores

What are High Flux Cores?

Magnetics High Flux cores are distributed air gap cores made from a 50% Nickel and 50% Iron alloy powder for the highest available biasing capability of any powder core material. High Flux cores offer the highest biasing capability of all powder core materials. The high saturation flux density (15,000 gauss) and relatively low losses of High Flux cores make them quite useful for applications involving high power, high DC bias, or high AC bias at high power frequencies such as Switching Regulator Inductors, In-Line Noise Filters, Flyback Transformers, Power Factor Correction (PFC), and Pulse Transformers.

What applications are High Flux cores best suited for?

High Flux Powder Cores are naturally suited for the energy storage filter inductors used in switch-mode power supplies. The 15,000 gauss saturation level of High Flux cores provides a higher energy storage capability than can be obtained with gapped ferrites or powdered iron cores of the same size and effective permeability.

High Flux cores will often result in a marked size and cost reduction when used in inductors that must carry large amounts of direct current.

High Flux cores are ideal for in-line noise filters where the inductor must support large AC voltage without core saturation occurring.

Line filters using High Flux cores can be smaller in size, requiring fewer turns than powdered iron or ferrite cores.

High Flux powder cores have a very low residual flux density. Combined with their saturation flux density of 15,000 gauss, this very large ΔB makes these cores excellent for use in power factor correction circuits as well as unidirectional drive applications such as flyback transformers and pulse transformers.

What are the advantages of High Flux cores

High Saturation (1.5 T)

Lower core loss than Iron Powder or Laminated Silicon

Lower cost than MPP material

Best DC Bias

Very high Curie temperature

Stable performance with temperature

Potential for the smallest size design

What is soft saturation?

Soft saturation is a distributed gap material advantage over a ferrite. The DC Bias curve does not have the traditional saturation point that a ferrite core does, rather as the oersteds increase the permeability slowly rolls off in a predictable fashion.