Planar transformer and magnetic core thereof

Abstract

The invention discloses a planar transformer and a magnetic core thereof. The magnetic core comprises an upper magnetic core and a lower magnetic core; the upper magnetic core comprises a quadrangular flat plate, and four triangular flat plates which are arranged on four sides of the quadrangular flat plate and have the same thickness and the same material; a square or rectangular upper magnetic core is formed by splicing the quadrangular flat plate with the triangular flat plates; the lower magnetic core is an integrated structure having a shape which is consistent with that of the upper magnetic core; an annular groove is arranged on the lower magnetic core; a raised cylinder is disposed in the centre of the annular groove; two groove clamps are arranged on the lateral surface of the cylinder; and the entire magnetic core is formed by buckling the upper magnetic core with the lower magnetic core together. By employing the planar transformer and the magnetic core thereof, the filtering effect and the EMI (Electro-Magnetic Interference) effect of the transformer can become better by means of a distributive capacitor; in the transformer with the structure, not only is a magnetic circuit shortened but also the magnetic circuit distribution is more uniform; and the structure can also be lowered in vortex loss, and effective in heat-radiating and magnetic-conducting performances.

Description

technical field [0001] The invention relates to an electronic transformer, in particular to a planar transformer with a special structure and its magnetic core. Background technique [0002] A transformer is a critical component in a power supply. Traditional transformers usually consist of ferrite cores and copper coils, which are bulky and prone to electromagnetic interference. Planar transformers can effectively solve volume and high frequency problems. Planar transformers are characterized by high frequency, low profile, small height and high operating frequency. However, the existing planar transformer designers and manufacturers at home and abroad are all using rectangular magnetic cores to make planar transformers. This structure will inevitably affect the technical performance of planar transformers: 1. The structural characteristics of this magnetic core, its coil At least half of it is exposed outside the magnetic core, which will cause its EMI index to deterior...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a planar transformer and its magnetic core, which aims to solve the problems of reduced coupling degree, large distributed capacitance, poor anti-saturation ability and inability to form a free air gap in the existing planar transformer.

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