CN205264477U - Planar transformer - Google Patents

Abstract

The utility model provides a planar transformer, includes: drain pan, time magnetic core, printed circuit board coil, secondary coil and last magnetic core, its characterized in that: be equipped with cake structure secondary coil between printed circuit board coil and the last magnetic core. This kind of planar transformer who adopts cake structure secondary coil, because the variation of the reducible coil winding in -process of cake structure secondary coil, the maximum uniformity of guaranteeing technology reduces the distributed constant variation of coil itself. After planar transformer adopted this kind of cake structure secondary coil, the electromagnetic interference and the common mode noise that satisfy transformer complete machine performance were up to standard, requirement that the uniformity is high. And planar transformer manufacturing cost at the bottom of the degradable.

Description

A kind of flat surface transformer

Technical field

The utility model relates to transformer, especially a kind of flat surface transformer.

Background technology

Existing flat surface transformer is made up of drain pan, lower magnetic core, printed wire board coil, printed wire board coil, secondary coil and upper magnetic core conventionally. Described secondary coil structure has two kinds, and one is to realize by the direct layout of printed substrate; A kind of is the square structure line cake that adopts three layer insulation wire to be made into. The former uniformity is high but cost costliness and required size space are larger, and to meet the safety requirement of product, shortcoming is the miniaturization that is unfavorable for product; Square structure line cake secondary coil is because gap between insulated wire is large, although cost of manufacture is cheap, homogeneity of product is poor, has influence on the distributed constant of transformer itself, as distribution capacity and leakage inductance etc., easily cause the electromagnetic interference of transformer overall performance and common-mode noise to exceed standard.

Utility model content

Technical problem to be solved in the utility model is the defect that makes up above-mentioned prior art, and the flat surface transformer that a kind of volume is little and homogeneity of product is high is provided.

Technical problem of the present utility model is solved by the following technical programs.

This flat surface transformer, comprising: drain pan, lower magnetic core, printed wire board coil, secondary coil and upper magnetic core.

The feature of this flat surface transformer is:

Between described printed wire board coil and upper magnetic core, be provided with cake structure secondary coil.

Technical problem of the present utility model is solved by following further technical scheme.

Described cake structure secondary coil turns to by self-adhesion three layer insulation wire the moulding that is heating and curing after line cake.

The utility model beneficial effect is compared with prior art:

The flat surface transformer of this employing cake structure secondary coil, because cake structure secondary coil can reduce the variation in coil winding process, has farthest ensured the uniformity of technique, reduces the distributed constant variation of coil itself. Flat surface transformer adopts after this cake structure secondary coil, and the electromagnetic interference and the common-mode noise that meet transformer overall performance are up to standard, the requirement that uniformity is high, and baseplane transformer manufacturing cost can be fallen.

Brief description of the drawings

Fig. 1 is flat surface transformer structural representation;

Fig. 2 is the secondary coil structure schematic diagram of flat surface transformer shown in Fig. 1.

Detailed description of the invention

Embodiment: from accompanying drawing 1 be clear that the structure of the utility model flat surface transformer and existing like product basic identical, comprising: drain pan 1, lower magnetic core 2, printed wire board coil 3 and upper magnetic core 5.

Difference is: between printed wire board coil 3 and upper magnetic core 5, be provided with cake structure secondary coil 4. Described cake structure secondary coil 4 as shown in the figure, turns to by self-adhesion three layer insulation wire 6 moulding that is heating and curing after line cake.

The installation relation of the each parts of described flat surface transformer is identical with existing like product.

Above content is in conjunction with concrete preferred embodiment further detailed description of the utility model, can not assert that concrete enforcement of the present utility model is confined to these explanations. For the utility model person of an ordinary skill in the technical field; make without departing from the concept of the premise utility some alternative or obvious modification that are equal to; and performance or purposes identical, all should be considered as belonging to the utility model by the definite scope of patent protection of submitted to claims.

Claims (2)

1. a flat surface transformer, comprising: drain pan, lower magnetic core, printed wire board coil, secondary coil and upper magnetic core, is characterized in that: between described printed wire board coil and upper magnetic core, be provided with cake structure secondary coil.

2. flat surface transformer according to claim 1, is characterized in that: described cake structure secondary coil turns to by self-adhesion three layer insulation wire the moulding that is heating and curing after line cake.