High-power planar transformer

Abstract

The invention relates to the technical field of transformers, in particular to a high-power planar transformer, which comprises a first magnetic core, a second magnetic core, a primary coil, a secondary coil and an insulating base, wherein the primary coil and the secondary coil are self-adhesion coils; the insulating base is provided with a centre shaft hole, the primary coil is arranged inside the insulating base and forms an integral structure with the insulating base, and the secondary coil is stacked on the insulating base; the first magnetic core and the second magnetic core are placed at two sides of the insulating base and form a magnetic path through the centre shaft hole; and the primary coil and the secondary coil are coupled. Because the coils are separately arranged inside aninsulator, the insulating degree is high, the manufacturing technology of the coils is simple, and the coils can be molded integrally through mold pouring; and because the coils are arranged inside the insulator, the structure can be more compact, the volume of the transformer is reduced, and the high-power planar transformer can be applied to thinner electronic products.

Description

Technical field: [0001] The invention relates to the technical field of transformers, in particular to a high-power planar transformer. Background technique: [0002] As the requirements for the power density of switching power supplies are getting higher and higher, the requirements for transformers, which are one of the bottlenecks in volume and weight of switching power supplies, are bound to be higher and higher. The use of planar transformers to replace traditional skeleton transformers is one of the important development trends of current switching power supplies. [0003] Existing planar transformers (especially for high-current and high-power applications) mostly use copper skin as the primary / secondary winding, stack multiple such windings together, and then form a transformer together with the magnetic core. Planar transformers with this structure often have the following problems: ①The insulation distance required by safety regulations is difficult to achieve, es...

AI Technical Summary

Problems solved by technology

Planar transformers with this structure often have the following problems: ①The insulation distance required by safety regulations is difficult to achieve, especially the reinforced insulation required by safety regulations in AC / DC converters, which is more complicated to implement and often requires a special framework to achieve the purpose ;②Due to the multi-layer superimposition, the structure and technology are complicated, and the processing and production are difficult

However, since the transformer winding itself is a part of the motherboard PCB, it must be limited by the number of PCB layers and copper thickness, and cannot pass a large current, so it can only be used in low-power applications.

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