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The basic structure of the magnetic core is as follows:
①Laminated sheet, usually punched from silicon steel or nickel steel sheet into E, I, F, O, etc. shapes, stacked into an iron core.
②The ring-shaped iron core is made of O-shaped sheets, or it can be wound from long and narrow silicon steel and alloy steel strips.
③C-shaped iron core, this kind of iron core can avoid the shortcomings of ring-shaped iron core winding difficulty, and is formed by butting two C-shaped iron cores.
④The pot-shaped iron core is a structure that has the magnetic core outside and the copper coil inside, eliminating the inconvenience of toroidal coils and reducing EMI. The disadvantage is that the internal coil has poor heat dissipation and high temperature rise.
Factors that should be considered when selecting the magnetic core structure when designing high-frequency transformers: reduce magnetic leakage and leakage inductance, increase coil heat dissipation area, facilitate shielding, easy coil winding, and convenient assembly and wiring.
In the design of the high-frequency transformer magnetic core structure, the size of the window area must be determined after comprehensive consideration of various factors. In order to prevent electromagnetic interference from the inside to the outside and from the outside to the inside of the high-frequency power transformer, some magnetic core structures have closed and semi-closed shells outside the window. The enclosed shell has a good effect on shielding electromagnetic interference, but it is inconvenient for heat dissipation and wiring, and wiring holes and air vents must be reserved. Semi-enclosed shell, the enclosed area plays a role of shielding electromagnetic interference, and the unenclosed area is used for wiring and heat dissipation. If the window is completely open, wiring and heat dissipation are convenient, and the effect of shielding electromagnetic interference is poor.