CN214152664U - Planar transformer - Google Patents

Abstract

The utility model discloses a planar transformer, including first magnetic core, first secondary coil, PCB coil, second secondary coil and the second magnetic core that sets gradually, first secondary coil and second secondary coil all are provided with first pin and second pin, first secondary coil and second secondary coil are provided with the insulating paint layer outward, and first pin and second pin are for leading the electrical foot. The utility model discloses a be provided with the insulating paint layer outside first secondary coil and second secondary coil, adopt the mode of dip coating, make secondary coil wrapped up by insulating paint, the copper exposure region can not appear and by the phenomenon of high-pressure breakdown, insulating paint layer is thinner than epoxy in addition, is favorable to the ultra-thin volume of planar transformer.

Description

Planar transformer

Technical Field

The utility model relates to a small-size inductive transformer technique, in particular to planar transformer.

Background

Planar transformers have a significantly smaller core size, particularly a much smaller height, than conventional transformers, which is a feature that has a significant attraction for power devices (e.g., chargers) where space is severely limited, and thus may be the preferred magnetic component for many power devices.

If the notice number is: CN 209015849U, name: in the patent of a novel charger transformer, a transformer is disclosed that includes a left and right magnetic core, a left and right secondary coil, and a PCB coil sandwiched between the secondary coils. In the manufacturing process, two times of encapsulation treatment are required after the secondary coil is subjected to punch forming, the first encapsulation is mainly used for filling gaps between the secondary coils, the second injection is to plastically pack epoxy resin outside the secondary coils, the process of the conventional planar transformer is complex, and in the second injection, if the secondary coils are not well positioned or the secondary coils are not completely packed (namely, part of the secondary coils is exposed with copper) in the injection molding process, the transformer can cause breakdown when the voltage is too high, the rejection rate is high, and in the one-time plastic package forming process, the number of the once-formed secondary coils is limited, the secondary coil plastic package parts need to be assembled after the forming process, and then the two secondary coils are welded. In addition, after the epoxy resin is plastically packaged, the thickness of the secondary coil is 2mm, so that the thickness of the transformer is thicker (generally more than 1CM), the space of a charger product is occupied, and the miniaturization requirement of the charger is not met.

Thus, the prior art has yet to be improved and enhanced.

SUMMERY OF THE UTILITY MODEL

In view of the foregoing disadvantages of the prior art, an object of the present invention is to provide a planar transformer to solve the problems of low production efficiency and high rejection rate of the existing transformers.

For solving the technical problem, the utility model discloses following technical scheme has been taken:

the utility model provides a planar transformer, is including the first magnetic core, first secondary coil, PCB coil, second secondary coil and the second magnetic core that set gradually, first secondary coil and second secondary coil all are provided with first pin and second pin, its characterized in that, first secondary coil and second secondary coil are provided with insulating paint layer outward, and first pin and second pin are electrically conductive foot.

As the improvement of the utility model, it is fixed through the bonding glue film between first magnetic core, first secondary, PCB coil, second secondary, the second magnetic core.

As the utility model discloses an improvement, the first pin of first secondary coil is connected with the first pin electricity of second secondary coil, and the second pin electricity of the second pin of first secondary coil, second secondary coil is the secondary wiring foot of planar transformer.

As a further improvement of the present invention, the insulating paint layer is formed by a dip coating method.

As a further improvement of the present invention, the PCB coil has a wiring port, the wiring port is disposed opposite to the second pin.

As a further improvement of the present invention, the PCB coil and the first secondary coil, the second secondary coil are oblong, the one end of the PCB coil has an extension, the wiring port set in on the extension.

As a further improvement of the present invention, the one end of the first magnetic core and the second magnetic core has a notch for exposing the wiring port.

As a still further improvement of the present invention, the planar transformer thickness is less than 1 CM.

As a further improvement of the utility model, the thickness of the insulating paint layer is 0.1-1 mm.

Compared with the prior art, the utility model provides a planar transformer is through being provided with the insulating paint layer outside first secondary coil and second secondary coil, adopts the mode of dip coating, makes secondary coil wrapped up by insulating paint, and the copper exposure region can not appear and by the phenomenon of high-voltage breakdown, and the insulating paint layer is thinner than epoxy in addition, is favorable to the ultra-thin of planar transformer.

Drawings

Fig. 1 is a schematic view of a three-dimensional structure of a planar transformer according to the present invention.

Fig. 2 is a schematic side view of the planar transformer according to the present invention.

Fig. 3 is an exploded schematic view of the planar transformer provided by the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It will be understood that when an element is referred to as being "on," "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present.

It should be noted that the terms of orientation such as left, right, up and down in the embodiments of the present invention are only relative to each other or are referred to the normal use state of the product, and should not be considered as limiting.

Referring to fig. 1, 2 and 3, the planar transformer provided by the present invention includes a first magnetic core 11, a first secondary coil 21, a PCB coil 3, a second secondary coil 22 and a second magnetic core 12, which are sequentially disposed, a waist-shaped through hole 25 is disposed in the middle of the first secondary coil 21, the PCB coil 3 and the second secondary coil 22, the first magnetic core 11 and the second magnetic core 12 are in a cover shape, and a convex column 13 adapted to the waist-shaped through hole 25 is disposed in the middle of the first magnetic core 11 and the second magnetic core 12.

The first secondary coil 21 and the second secondary coil 22 are both provided with a first pin 23 and a second pin 24, an insulating paint layer (not numbered) is arranged outside the first secondary coil 21 and the second secondary coil 22, and the first pin 23 and the second pin 24 are conductive pins, namely the first pin 23 and the second pin 24 are used for wiring and are not wrapped by the insulating paint layer. Through being provided with insulating paint layer outside first secondary 21 and second secondary 22, adopt the mode of dip coating, make secondary be wrapped up by insulating paint, the phenomenon that the copper region is exposed and is punctured by too high pressure can not appear, and insulating paint layer is thinner than epoxy moreover, is favorable to the ultra-thin of planar transformer.

In this embodiment, the PCB coil 3 is a primary coil of a transformer, and is sandwiched between the first secondary coil 21 and the second secondary coil 22 to form an induction coil of the transformer, and the induction coil is sandwiched between the first magnetic core 11 and the second magnetic core 12 to form a planar transformer, so that the whole transformer has a compact structure.

In an embodiment, the first magnetic core 11, the first secondary coil 21, the PCB coil 3, the second secondary coil 22, and the second magnetic core 12 are fixed by an adhesive layer (not numbered in the figure), and the gap between the magnetic core and the induction coil is controlled to adjust the magnetic flux, so that the relevant parameters (such as voltage, current, conversion efficiency, etc.) of the planar transformer are controlled within a set range, and the product consistency is high.

In one embodiment, the insulating paint layer is formed in a paint dipping mode, the fact that the other parts of the secondary coil except the pins are completely wrapped by the insulating paint layer can be guaranteed in the paint dipping mode, the yield of products is improved, the thickness of the insulating paint layer can be 0.1-0.5mm in the paint dipping mode, accordingly, the thickness of the planar transformer is smaller than 1CM, and the thickness of the transformer is greatly reduced.

In this embodiment, the thickness of the insulating paint layer is preferably 0.2-0.3mm, so that the thickness of the planar transformer is within 8 mm. The utility model discloses can put into insulating varnish pond with a large amount of secondary coil and soak about 15 minutes, directly send into the burning box in the solidification of drying again, compare and adopt the injection molding machine to mould plastics and need carry out loaded down with trivial details operation modes such as location, preheating, cooling shaping, deburring, two plastic-sealed piece equipment in mould to each secondary coil, its work efficiency promotes by a wide margin, but also can save the injection molding machine, equipment purchasing cost also reduces by a wide margin.

Referring to fig. 1 to fig. 3, the first pin 23 of the first secondary winding 21 is electrically connected to the first pin 23 of the second secondary winding 22, and the second pin 24 of the first secondary winding 21 and the second pin 24 of the second secondary winding 22 are secondary connection pins of the planar transformer. The first pins 23 are shorter than the second pins 24, so that the two first pins 23 can be conveniently welded together, the distance between the two secondary coils is slightly larger than the thickness of the PCB coil 3, and the thickness of the transformer is as thin as possible.

In the embodiment of the utility model provides an in, PCB coil 3 has wiring port 32, wiring port 32 sets up with second pin 24 relatively, makes planar transformer's one end be primary wiring end, and the other end is level wiring end, avoids the wiring mistake.

Referring to fig. 3, the PCB coil 3, the first secondary coil 21 and the second secondary coil 22 are oblong, one end of the PCB coil 3 has an extension 31, and the wiring port 32 is disposed on the extension 31 to facilitate the welding with the PCB of the charger power supply.

Preferably, one end of the first magnetic core 11 and the second magnetic core 12 has a notch 14 for exposing the wiring port 32, so that the magnetic core covers only the exposed wiring portion of the induction coil, thereby improving the reliability of the planar transformer and preventing the induction coil from being damaged during installation and transportation.

Further, after the assembly test of the planar transformer is finished, the planar transformer is subjected to paint dipping treatment to form a protective film on the surface of the transformer.

Furthermore, a shielding cover (not shown in the figure) is disposed outside the first magnetic core 11 and the second magnetic core 12, so as to improve the anti-interference performance of the planar transformer.

To sum up, the utility model provides a planar transformer is through being provided with the insulating paint layer outside the level coil, adopts the mode of dip coating, makes secondary coil wrapped up by insulating paint, and the copper exposure is regional and by the phenomenon of too high pressure breakdown can not appear, and the insulating paint layer is thinner than epoxy in addition, is favorable to the ultra-thin of planar transformer.

The utility model discloses processing to secondary coil adopts the dip coating mode, once can soak a large amount of secondary coils, and production efficiency promotes by a wide margin, compares and adopts the injection molding machine to mould plastics and need carry out loaded down with trivial details operation modes such as location, preheating, cooling shaping, deburring, two plastic-sealed piece equipment in the mould to each secondary coil, and its work efficiency promotes by a wide margin, but also can save the injection molding machine, and equipment purchasing cost also reduces by a wide margin.

It should be understood that equivalent alterations and modifications can be made by those skilled in the art according to the technical solution of the present invention and the inventive concept thereof, and all such alterations and modifications should fall within the scope of the appended claims.

Claims (10)

1. The utility model provides a planar transformer, is including the first magnetic core, first secondary coil, PCB coil, second secondary coil and the second magnetic core that set gradually, first secondary coil and second secondary coil all are provided with first pin and second pin, its characterized in that, first secondary coil and second secondary coil are provided with insulating paint layer outward, and first pin and second pin are electrically conductive foot.

2. The planar transformer according to claim 1, wherein the first magnetic core, the first secondary coil, the PCB coil, the second secondary coil and the second magnetic core are fixed by an adhesive layer.

3. The planar transformer of claim 2, wherein the first pin of the first secondary winding is electrically connected to the first pin of the second secondary winding, and the second pin of the first secondary winding and the second pin of the second secondary winding are electrically connected to the secondary terminal pin of the planar transformer.

4. The planar transformer according to claim 2, wherein the insulating paint layer is formed by dip coating.

5. The planar transformer of claim 3, wherein the PCB coil has a terminal port disposed opposite the second leg.

6. The planar transformer of claim 5, wherein the PCB coil and the first and second secondary coils are oblong, one end of the PCB coil having an extension, the wiring port being disposed on the extension.

7. The planar transformer as claimed in claim 6, wherein one end of the first and second magnetic cores has a notch for exposing the terminal port.

8. The planar transformer according to claim 6, wherein the planar transformer thickness is less than 1 CM.

9. Planar transformer according to claim 1, characterized in that the thickness of the insulating lacquer layer is 0.1-0.5 mm.

10. The planar transformer according to any one of claims 1 to 9, wherein a shielding can is provided outside the first and second magnetic cores.

Images