LLC transformer and processing technology thereof

Abstract

The invention relates to an LLC transformer and a processing technology thereof. A circle of spacing sticker I is added to a wide slot area of a skeleton, a primary winding N1 is wound, and a winding leading-out terminal and a finishing leading-out terminal are connected with a fourth pin and a second pin respectively; eight circles of spacing stickers II are added to a wide slot area of the skeleton, a secondary winding N2N3 is wound and a double-wire winding leading-out terminal and a double-wire finishing leading-out terminal are connected with an eighth pin, a ninth pin, a tenth pin and an eleventh pin respectively; three layers of insulating adhesive tapes II coat the outside of the secondary winding N2N3 and the spacing stickers II; a primary feedback winding N4 is wound on the secondary winding N2N3 in the narrow slot area of the skeleton, the winding leading-out terminal and the finishing leading-out terminal are connected with a fifth pin and a sixth pin respectively and two layers of insulating adhesive tapes III coat the outside of the primary feedback winding N4; a housing sleeves the skeleton; and ferrite cores are inserted. The qualified transformer enters a dip coating procedure and a drying procedure. The LLC transformer has the effects that a resonant inductor does not need to be additionally arranged in a power supply, so that the volume is reduced, the cost is reduced and the skin effect and the proximity effect are avoided.

Description

technical field [0001] The invention relates to an LLC transformer and its processing technology. Background technique [0002] With the development of modern power electronics technology and the birth of high-frequency switching devices, switching power supplies are developing towards high frequency, integration and modularization. The LLC resonant converter is more and more widely used, and its resonant inductance can be replaced by the leakage inductance of the transformer. [0003] The advantages are: simple structure, easy operation, effective control of leakage inductance, and high consistency of parameters. [0004] LLC transformers have certain requirements for leakage inductance. Unlike other structures, the smaller the leakage inductance, the better. The leakage inductance of the transformer is mainly related to the number of primary turns and the structure of the transformer winding. The more turns, the greater the leakage inductance; the more separated the prim...

AI Technical Summary

Problems solved by technology

Its disadvantage is that the control and demand for leakage inductance cannot be realized, and an additional resonant inductor needs to be configured to assist in completing the circuit requirements.

This increases the volume of the entire high-frequency power supply and increases the cost

Improper selection of transformer wire, the overall temperature rise is too high

Improper processing technology, the output is easy to be unbalanced

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