CN209962853U

CN209962853U - PCB of planar transformer

Info

Publication number: CN209962853U
Application number: CN201920826385.5U
Authority: CN
Inventors: 查小月; 欧阳过; 任菁菁
Original assignee: Shenzhen Sunlord Electronics Co Ltd
Current assignee: Apple Inc
Priority date: 2019-06-03
Filing date: 2019-06-03
Publication date: 2020-01-17
Anticipated expiration: 2029-06-03

Abstract

The utility model discloses a PCB of a planar transformer, which comprises a PCB substrate and a double-sided winding part which is formed on the double sides of the PCB substrate by colloid injection molding and is integrated with the PCB substrate; the PCB substrate is provided with a through hole; the double-sided winding part is of a symmetrical structure on the double sides of the PCB substrate, the center of the double-sided winding part is provided with a through hole consistent with the through hole, and the through hole is aligned with the through hole to form a magnetic core hole for a magnetic core to pass through; a wire blocking part is formed on the periphery of the via hole in a protruding mode; and the hole wall of the magnetic core hole is provided with a wire passing groove for a metal wire to pass through so as to simultaneously perform plane winding from inside to outside on two sides of the double-sided winding part, thereby forming two series coils positioned on two sides of the PCB substrate. The utility model discloses need not at PCB base plate two sides coating self-adhesive layer, reduced the time of coating self-adhesive layer to solved because self-adhesive layer can take place the phenomenon of flowing toasting the in-process, a series of problems such as phenomenon appear gathering in the self-adhesive layer of pasting at wire winding in-process.

Description

PCB of planar transformer

Technical Field

The utility model relates to a planar transformer's PCB board.

Background

Generally, a conventional transformer is a wound transformer, in which a coil is wound on a bobbin and assembled with a magnetic core or a coil is directly wound on a magnetic ring. The product has a complex structure and a large volume; the cost reduction capability is low; the equipment cost investment is large, and the model changing difficulty is high; the product has high consistency, poor stability, high potential failure risk and the like; in the fields of small internal space, strict requirements on energy conservation and heat dissipation and higher requirements on weight and stability in national defense, aviation, aerospace and the like, the planar transformer plays a larger role gradually at present, but has a larger defect, and for multilayer superposed windings, the PCB board has a complex process and high cost.

The above background disclosure is only provided to aid understanding of the inventive concepts and solutions of the present invention, and it does not necessarily pertain to the prior art of this patent application, and it should not be used to assess the novelty and inventive step of this application without explicit evidence to suggest that such matter has been disclosed at the filing date of this patent application.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a main aim at provides a two-sided wire winding portion and the automatic two-sided wire wound PCB board of accessible automatic spooling equipment simultaneously of colloid injection moulding integrated into one piece to PCB board technology is complicated and the problem that multilayer stack winding wire winding is inefficient when solving planar transformer and using.

The utility model discloses a reach above-mentioned purpose and propose following technical scheme:

a PCB of a planar transformer comprises a PCB substrate and a double-sided winding part which is formed on the double sides of the PCB substrate through colloid injection molding and is integrated with the PCB substrate; the PCB substrate is provided with a through hole; the double-sided winding part is of a symmetrical structure on the double sides of the PCB substrate, the center of the double-sided winding part is provided with a through hole consistent with the through hole, and the through hole is aligned with the through hole to form a magnetic core hole for a magnetic core to pass through; a wire blocking part is formed on the periphery of the via hole in a protruding mode; and the hole wall of the magnetic core hole is provided with a wire passing groove for a metal wire to pass through so as to simultaneously perform plane winding from inside to outside on two sides of the double-sided winding part, thereby forming two series coils positioned on two sides of the PCB substrate.

Preferably, the wire passing groove comprises a first groove located on the hole wall of the through hole and two second grooves located on two wire blocking parts on two sides of the double-sided winding part.

Preferably, the one metal wire comprises a single strand of copper wire or a plurality of strands of copper wire.

Preferably, the through hole of the PCB substrate is circular, oval or rectangular.

Preferably, the metal wire is coated with a self-adhesive layer; when the double-sided winding part is wound, the coil is formed by heating and fixing the winding part while winding.

Preferably, two coils wound on both sides of the double-sided winding part each have a lead terminal only at the outermost turn, the lead terminals being soldered to corresponding PIN holes on the PCB substrate.

The above technical scheme of the utility model, need not to make self-adhesive line adhesion the self-adhesive layer on the PCB board at PCB base plate two sides coating polyimide film or other. Therefore, the time for coating the self-adhesive layer is reduced, and a series of problems that the phenomenon of flowing can occur in the baking process of the coated self-adhesive layer, the phenomenon of accumulation can occur in the winding process of the adhered self-adhesive layer and the like are solved. The planar transformer PCB has the advantages of shortening the manufacturing process, reducing the cost, reducing the influence of human factors and ensuring the product qualification rate and the product consistency.

Drawings

Fig. 1 is a schematic perspective view of a PCB substrate of a planar transformer PCB of the present invention;

FIG. 2 is a top view of the PCB substrate shown in FIG. 1;

fig. 3 is a top view of a planar transformer PCB according to an embodiment of the present invention;

FIG. 4 is a front view of the PCB board shown in FIG. 3;

FIG. 5 is a schematic view of a double-sided winding portion on the PCB shown in FIG. 3;

FIG. 6 is a plan view of the double-sided winding portion shown in FIG. 5;

FIG. 7 is a schematic diagram of double-sided routing on the PCB board shown in FIG. 3;

fig. 8 and 9 are two further variations of the PCB substrate shown in fig. 1.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and specific embodiments.

The specific embodiment of the utility model provides a PCB board of planar transformer, planar transformer mainly is applied to the cell-phone quick charge power adapter, also can be used in panel computer, new energy automobile power adapter; and the utility model provides a PCB board need not again at surface coating self-adhesive layer, but carries out the wire winding of two-sided plane through colloid injection moulding's mode formation integrative two-sided wire winding portion on the PCB base plate to can remove from because of the cost of labor that the coating self-adhesive layer brought and avoid bringing a series of problems when self-adhesive layer secondary is heated.

Referring to fig. 1 to 7, a PCB of a planar transformer according to an embodiment of the present invention includes a PCB substrate 1 and a double-sided winding portion 2 formed on both sides of the PCB substrate by molding glue and integrated with the PCB substrate. As shown in fig. 1 and fig. 2, the PCB substrate 1 has a large through hole 10 for passing the magnetic core of the transformer, and a first groove 101 is formed on the wall of the through hole 10; the periphery of the PCB substrate is provided with a plurality of PIN holes 11. As shown in fig. 3 to 6, the double-sided winding portion 2 formed by injection molding has a symmetrical structure on both sides of the PCB substrate 1, and a via hole 20 is formed in the center of the double-sided winding portion and coincides with the through hole 10, and the via hole 20 is aligned with the through hole 10 and forms a magnetic core hole through which a magnetic core passes. One circle of the protruding periphery of the via hole 20 forms a wire blocking part 21, a second groove 210 is also arranged at a position corresponding to the first groove on the two double-sided wire blocking parts 21, and the first groove 101 and the two second grooves 210 together form the wire passing groove 30. As shown in fig. 7, a complete metal wire is used to pass through the wire passing slot 30, so that the two sides 22 of the double-sided winding part 2 can be simultaneously wound, and the two planar coils are wound from the inner side to the outer side, thereby forming a planar coil 40 on each side, and the two planar coils are connected in series, each coil has a lead terminal 41 only at the outermost side (the end of the winding), and the lead terminals 41 are used for being soldered to the corresponding PIN holes 11 on the PCB substrate.

It should be understood that the above "a complete metal wire" may be a single strand of copper wire or a wire consisting of more than two strands of copper wire, and the term "a" is used to emphasize two ends with only two ends. The utility model discloses a during the line winding of going on the PCB board, can adopt semi-automatic CNC spooling equipment to carry out alpha wire winding, the wire that adopts can be the cladding has the copper line on self-adhesive layer, and at automatic wire winding in-process, spooling equipment can make the wire fix by the heating while coiling. In addition, due to the existence of the wire blocking part 21, when the conducting wire is wound from the inner ring to the outside, the innermost ring is blocked by the wire blocking part, and the shape of the coil is fixed.

In the embodiment shown in fig. 1 to 7, the through hole of the PCB substrate 1 is circular, and correspondingly, the through hole of the injection molded double-sided winding part 2 is also circular, which is suitable for a circular magnetic core. However, the present invention is not limited to the applicable magnetic core, that is, the through hole of the PCB substrate of the present invention may also be other shapes, such as rectangle, ellipse, etc., as shown in fig. 8 and 9. That is, the core hole may have other shapes such as a rectangular shape and an elliptical shape. Accordingly, the wound coil is a rectangular coil or an elliptical coil.

The manufacturing method of the planar transformer with the PCB comprises the following steps:

providing a PCB substrate having a through hole, such as the PCB substrate shown in fig. 1, 8 and 9; then, performing colloid injection molding on two sides of the PCB substrate to form a double-sided winding part integrated with the PCB substrate; then, winding is carried out: the PCB with the double-sided winding portion formed on the PCB is clamped on a jig of a winding machine by adopting automatic winding equipment, a lead is clamped by a clamping head to penetrate through a magnetic core hole of the PCB and be clamped into a wire passing groove, the two sides can start winding (winding is started from an inner ring) at the same time, and a lead end is welded to a corresponding PIN hole after winding. The winding can be performed by single-strand single layer, single-strand multilayer, single-layer multi-strand or Liz wire side-by-side mode, multi-strand or Liz wire multilayer side-by-side mode. Illustrated in fig. 7 is a single layer winding. And finally, installing the magnetic core to form the planar transformer.

In preferred embodiment, consider that the wire is buckled in wire casing department, the insulating layer damage that appears the wire surface easily switches on with the magnetic core, leads to the withstand voltage value of transformer to reach the requirement, the utility model discloses when making this kind of planar transformer, on the magnetic core, with the problem that wire and magnetic core directly switched on when the corresponding position department coating insulated paint of wire casing takes place in order to avoid above-mentioned circumstances to guaranteed that the withstand voltage value of transformer can reach the requirement.

The transformer has the advantages of small volume and low device height; moreover, under the same power, the volume of the transformer is usually at least 1/4 less than that of the traditional winding transformer; the structure is compact and firm, the reliability is high, and the consistency is high; the windings are arranged orderly, and the leakage inductance is small; low EMI radiation interference, etc.

On the other hand, the whole process is automatically completed by the winding machine, so that the processing time is shortened, the influence of artificial factors is reduced, and the corresponding product qualification rate and the product consistency can be better ensured.

The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the technical field of the utility model belongs to the prerequisite of not deviating from the utility model discloses, can also make a plurality of equal substitution or obvious variants, performance or usage are the same moreover, all should regard as belonging to the utility model's scope of protection.

Claims

1. The utility model provides a PCB board of planar transformer, includes PCB base plate (1), its characterized in that: the double-sided winding part is formed on the double sides of the PCB substrate through colloid injection molding and is integrated with the PCB substrate into a whole (2);

the PCB substrate (1) is provided with a through hole (10);

the double-sided winding part (2) is of a symmetrical structure on the double sides of the PCB substrate (1), the center of the double-sided winding part is provided with a through hole (20) consistent with the through hole (10), and the through hole (20) is aligned with the through hole (10) to form a magnetic core hole for a magnetic core to pass through;

a wire blocking part (21) is formed by the protrusion of the periphery of the via hole (20);

and the hole wall of the magnetic core hole is provided with a wire passing groove (30) for a metal wire to pass through so as to simultaneously perform plane winding from inside to outside on two sides of the double-sided winding part (2), thereby forming two series coils positioned on two sides of the PCB substrate.

2. The PCB board of claim 1, wherein: the wire passing groove comprises a first groove (101) located on the hole wall of the through hole (10) and two second grooves (210) located on two wire blocking parts (21) on two sides of the double-sided winding part (2).

3. The PCB board of claim 1, wherein: the one metal wire includes a single strand of copper wire or a plurality of strands of copper wire.

4. The PCB board of claim 1, wherein: the through hole of the PCB substrate is circular, oval or rectangular.

5. The PCB board of claim 1, wherein: the metal wire is coated with a self-adhesive layer; when the double-sided winding part is wound, the coil is formed by heating and fixing the winding part while winding.

6. The PCB board of claim 1, wherein: and the two coils are wound on two sides of the double-sided winding part, each coil only has one lead end at the outermost coil, and the lead ends are welded to corresponding PIN holes on the PCB substrate.