CN214152679U

CN214152679U - Power supply unit and planar transformer

Info

Publication number: CN214152679U
Application number: CN202023293568.7U
Authority: CN
Inventors: 黄昕; 曾昭雄; 陈杰
Original assignee: Jinan Anhai Semiconductor Co ltd
Current assignee: Jinan Anhai Semiconductor Co ltd
Priority date: 2020-12-31
Filing date: 2020-12-31
Publication date: 2021-09-07
Anticipated expiration: 2030-12-31

Abstract

The utility model discloses a planar transformer and power supply unit. The planar transformer comprises a first magnetic core, a first secondary coil, a PCB (printed circuit board) coil, a second secondary coil and a second magnetic core which are sequentially arranged, wherein the first secondary coil and the second secondary coil are respectively provided with a first pin and a secondary wiring pin, an insulating paint layer is arranged outside the first secondary coil and the second secondary coil, and the first pin and the secondary wiring pin are conductive pins. 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

Power supply unit and planar transformer

Technical Field

The utility model relates to a small-size inductive transformer technique, in particular to power supply unit and 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.

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 power supply device and a planar transformer, which solve the problems of low production efficiency and high rejection rate of the existing transformer.

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

the utility model provides a planar transformer, includes first magnetic core, second magnetic core, secondary coil, PCB coil, secondary coil integrated into one piece sets up, the PCB coil presss from both sides and locates in the secondary coil, the secondary coil presss from both sides and locates between first magnetic core and the second magnetic core, the secondary coil is provided with the insulating paint layer outward.

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

As the improvement of the utility model, the secondary coil is formed by folding two flat coils which are connected, and the tail ends of the two flat coils are provided with secondary wiring pins.

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, which is disposed opposite to the secondary wiring pin.

As a further improvement of the utility model, the thickness of the insulating paint layer is 0.1-0.5 mm.

As a further improvement of the present invention, the flat coil is formed by press molding or by winding with a spring machine.

The utility model also provides a power supply unit, including the power body, be provided with foretell planar transformer in the power body.

Compared with the prior art, the utility model provides an among power supply unit and the planar transformer, the planar transformer adopts integrated into one piece's secondary, and make secondary be provided with the insulating paint layer outward, two current secondary coil equipment and welded steps have been saved to the mode that adopts integrated into one piece, the equipment process becomes few, production efficiency promotes, and adopt the mode of dip coating, make secondary wrapped up by insulating paint, the copper exposure region can not appear and by the phenomenon of high-pressure breakdown, and the insulating paint layer is thinner than epoxy, be favorable to the ultra-thinization 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.

Fig. 4 is a flowchart of a manufacturing method 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.

Please refer to fig. 1, fig. 2 and fig. 3, the planar transformer provided by the present invention comprises a first magnetic core 11, a secondary coil 2, a PCB coil 3 and a second magnetic core 12, which are sequentially disposed, wherein the secondary coil 2 is integrally formed, the PCB coil 3 is clamped in the secondary coil 2, a waist-shaped through hole 21 is disposed between the secondary coil 2 and the PCB coil 3, the first magnetic core 11 and the second magnetic core 12 are in a cover shape, and the middle portion of the first magnetic core 11 and the second magnetic core 12 has a convex column 13 adapted to the waist-shaped through hole 21. The secondary coil 2 is clamped between the first magnetic core 13 and the second magnetic core 12, and the convex column 13 is located in the kidney-shaped through hole 21.

The secondary winding 2 is provided with a layer of insulating varnish (not numbered in the figures), and the secondary winding 2 has two secondary terminal pins 24 for connection, which are not covered with the layer of insulating varnish. The utility model discloses a mode that adopts the dip coating to secondary coil 2 forms insulating paint layer, makes secondary coil wrapped up by insulating paint, and the copper exposure region can not appear and by the phenomenon of high-pressure breakdown, and insulating paint layer is thinner than epoxy in addition, 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 secondary coils 2 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 flat planar transformer, so that the whole transformer has a compact structure.

In an embodiment, the first magnetic core 11, the secondary winding 2, the PCB winding 3, 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 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 the dip coating equipment with a large amount of secondary coil and soak about 15 minutes, directly send into the burning box stoving solidification 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 the 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.

Preferably, the secondary coil 2 is formed by folding two connected

flat coils

22 and 23 in half, the tail ends of the two

flat coils

22 and 23 form a secondary wiring pin 24, the steps of assembling and welding the

flat coils

22 and 23 can be omitted in an integrated forming mode, the process flow is simplified, the production efficiency is improved, in addition, the space between the two

flat coils

22 and 23 can be favorably kept in a one-step forming mode, the consistency of products is favorably improved, and the thickness of the transformer is reduced as much as possible only by enabling the space between the two

flat coils

22 and 23 to be slightly larger than the thickness of the PCB coil 3 in the forming process.

Optionally, the flat coil 2 is formed by punching through a punching machine, the flat coil 2 is made of copper or copper alloy, two connected

flat coils

22 and 23 are punched at one time through the punching machine, and then the secondary coil 2 is formed by bending a connecting portion 25 between the two

flat coils

22 and 23 through a bending machine.

Of course, the utility model discloses the mode that also can adopt the coiling of coiling machine makes the flat coil shaping, and this mode is compared with stamping equipment, does not have the waste material to produce, and material cost is low, has also saved the treatment cost of waste material moreover, is favorable to reducing product cost, improves market competition.

In the embodiment of the utility model provides an in, PCB coil 3 has wiring port 32, wiring port 32 sets up with secondary wiring foot 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 and the secondary coil 2 are oblong, one end of the PCB coil 3 has an extension 31, and the connection port 32 is disposed on the extension 31 to facilitate the connection with the PCB board 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.

Based on foretell planar transformer, the utility model discloses still correspondingly provide a power supply unit, including power supply body, be provided with foretell planar transformer in the power supply body. The power supply device may be a mobile power supply, a charger power supply, etc., and the above description has been given to the planar transformer, which is not repeated herein.

The utility model discloses still provide a manufacturing method of planar transformer, please refer to fig. 4, it includes following step:

s10, manufacturing two connected flat coils in a stamping or winding mode, and folding the two flat coils in half to form a secondary coil;

s20, immersing the electromagnetic induction part of the secondary coil into paint dipping equipment, and wrapping an insulating paint layer outside the secondary coil;

and S30, embedding the PCB coil into the secondary coil, and arranging a first magnetic core and a second magnetic core at two sides of the secondary coil.

In step S10, the copper sheet is punched by a punching device to form two connected flat coils, and then the connection portion between the two flat coils is bent by a bending device to form a secondary coil.

The utility model discloses the mode that also can adopt the coiling of spring machine makes the flat coil shaping, and this mode is compared with stamping equipment, does not have the waste material to produce, and material cost is low, has also saved the treatment cost of waste material moreover, is favorable to reducing product cost, improves market competition.

The step in step S20 includes: hanging the secondary wiring pin of the secondary coil in a paint dipping device in an inverted manner, covering the paint dipping device and vacuumizing to enable the liquid level of the insulating paint to rise to the root of the secondary wiring pin, keeping negative pressure for 4 minutes, then uncovering to break vacuum, standing in the paint dipping device for 5-10 minutes, then sending into an oven to bake at a temperature of 100-120 ℃ for 30 minutes, baking at a temperature of 130-150 ℃ for 100-120 minutes, and then cooling.

Wherein the S30 further includes: and dispensing and fixing in gaps among the first magnetic core, the secondary coil, the PCB coil and the second magnetic core. The utility model discloses can directly glue when the equipment and glue in advance fixed, later test the parameter of planar transformer, send into fan or oven again and solidify and make it fixed.

To sum up, the utility model discloses an integrated into one piece's secondary to make secondary be provided with the insulating paint layer outward, adopt integrated into one piece's mode, can ensure that secondary outward appearance is unanimous, saved two current secondary equipment and welded steps moreover, the equipment process becomes few, production efficiency promotes, and adopt the mode of dip coating, make secondary 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 moreover, be 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.

Furthermore, the utility model discloses still adopt the mode that adopts the coiling of spring machine to make the flat coil shaping, this mode is compared with stamping equipment, does not have the waste material to produce, and material cost is low, has also saved the treatment cost of waste material moreover, is favorable to reducing product cost, improves market competition.

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

1. The utility model provides a planar transformer, includes first magnetic core, second magnetic core, secondary, PCB coil, its characterized in that, secondary integrated into one piece sets up, the PCB coil presss from both sides and locates in the secondary, the secondary presss from both sides and locates between first magnetic core and the second magnetic core, the secondary is provided with the insulating paint layer outward.

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

3. The planar transformer according to claim 2, wherein the secondary coil is formed by folding two connected flat coils in half, and the two flat coils have secondary connection pins at their ends.

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

5. A planar transformer according to claim 3, wherein the PCB coil has a terminal port disposed opposite a secondary terminal pin.

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

7. The planar transformer according to claim 6, wherein the thickness of the layer of insulating varnish is 0.2-0.3 mm.

8. The planar transformer according to claim 3, wherein the flat coil is formed by stamping or coiling.

9. A planar transformer according to claim 5, wherein the PCB coil and the secondary coil are oblong, one end of the PCB coil having an extension on which the wiring port is provided.

10. A power supply apparatus comprising a power supply body, characterized in that the planar transformer of any one of claims 1-9 is provided in the power supply body.