A planar transformer

Abstract

The invention discloses a planar transformer which comprises a magnetic core and a coil winding; the magnetic core comprises a top plate, a bottom plate, a middle column and two edge columns, the middle column and the two edge columns are located between the top plate and the bottom plate, the coil winding and the magnetic core are assembled together, the top plate and the bottom plate are composed of a whole magnetic block or formed by laying and splicing a plurality of unit magnetic block bodies, and the middle column and the edge columns are formed by stacking multiple unit magnetic block bodies; each unit magnetic block body is a flat strip-shaped block body, and a preset gap is formed between the two ends of the two adjacent unit magnetic block bodies which are laid and spliced. The whole magnetic core is formed by piling multiple unit magnetic block bodies, the transformer can still maintain high efficiency under high frequency, the unit magnetic block body is the flat strip-shaped block body, it is convenient to produce the magnetic core, it is beneficial to miniaturization and planarizartion, and a piled production mode is more beneficial to automated generation; the preset gap is formed between the two ends of the two adjacent unit magnetic block bodies which are laid and spliced, magnetic resistance between every two unit magnetic block bodies is increased, an edge magnetic line can be drawn close to the magnetic core, and thus diffusion flux is reduced.

Description

technical field [0001] The present application relates to a planar transformer. Background technique [0002] With the continuous development of electronic information technology, transformers are one of the key components in electronic equipment. Since the advent of planar transformers, they have been used in communications, notebook computers, automotive electronics, digital televisions, etc. in just over 10 years. be widely used. The higher and higher requirements make planar transformers become the mainstream and trend of the transformer industry. [0003] The planar transformer is a kind of planar structure transformer developed by the electronic transformer after a long period of development. From the appearance point of view, the biggest difference compared with the traditional transformer lies in the iron core and coil winding. The planar transformer winding is formed by etching the copper foil on the PCB board and stacking it spirally by using the PCB board manuf...

AI Technical Summary

Problems solved by technology

This type of magnetic core is easy to magnetically saturate during application, which greatly reduces the efficiency of the transformer

The core air gap is too concentrated, which will also cause winding loss

At the same time, the output ends of the planar transformer windings are mainly pins, and all the solder holes on the PCB board are solder holes, which are not suitable for welding and inspection during assembly, which increases the difficulty of maintenance.

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