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What are the criteria for the selection of magnetic materials for high frequency transformers?
Feb 27, 2017


      What are the criteria for the selection of magnetic materials for high frequency             transformers?


Magnetic materials have been widely used in our lives. For example, permanent magnetic materials are used as motors, core materials used in transformers, magneto-optical disks used as memories, magnetic recording disks for computers and the like.

 

High frequency transformer magnetic material selection criteria are high initial permeability μi, low coercivity Hc, high saturation magnetic induction Bs, low remanence Br, high resistivity ρ, and high Curie temperature point. High magnetic permeability, the excitation current is small when the high-frequency transformer is working, the hysteresis loss is low when the coercive force is low, and the magnetic flux variation range when the high-frequency transformer is working is high saturation magnetic induction, low remanence.

   

The choice of high-frequency transformer core structure is to consider the energy transfer, the second is to consider the geometric size constraints, and the third is to consider the core cross-sectional area and window area ratio, multi-output transformers generally require a larger window area, select EE-type, EI-type, or PQ-type cores can have large windows and good heat dissipation. DC/DC module power supplies can be FEY type, FEE type, EUI type, etc. The transformer requires a relatively large core cross-sectional area. The use of GU-shaped cores; in addition should also consider the installation of the transformer, processing convenience, cost, etc. Currently, medium and high power is usually selected GU-shaped core, this core is characterized by a larger cross-sectional area, a small magnetic flux leakage The use of domestic materials, low cost, but the need to hand welding


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