CN115985640A - Flat transformer - Google Patents
Flat transformer Download PDFInfo
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- CN115985640A CN115985640A CN202310266573.8A CN202310266573A CN115985640A CN 115985640 A CN115985640 A CN 115985640A CN 202310266573 A CN202310266573 A CN 202310266573A CN 115985640 A CN115985640 A CN 115985640A
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Abstract
The invention discloses a flat-plate transformer which comprises a transformer body, wherein the transformer body comprises a lower magnetic core, an upper magnetic core and a plurality of groups of winding assemblies, the lower magnetic core comprises a base, two ends of the base are respectively provided with a side plate, the base is also provided with a plurality of elliptical magnetic core center columns, a plurality of heat dissipation through holes are formed in each elliptical magnetic core center column, and the heat dissipation through holes are communicated from the top surfaces of the elliptical magnetic core center columns to the bottom surface of the base; the upper magnetic core is detachably and fixedly covered on the top of the side plate, and the top of each middle column of the oval magnetic core is connected with the bottom of the upper magnetic core; each elliptic magnetic core center pillar is sleeved with a group of winding assemblies, each group of winding assemblies is provided with a plurality of primary windings and a plurality of secondary windings, and the primary windings and the secondary windings are alternately sleeved on the corresponding elliptic magnetic core center pillars; the flat-plate transformer has higher integration level, less occupied space, small leakage inductance and small power loss, and accords with the development direction of small volume and high power density of the transformer.
Description
Technical Field
The invention relates to the technical field of transformers, in particular to a flat-plate transformer.
Background
With the development of power supply technology, the small size and high power density become the pursuit target and development direction of power supply at present, the transformer is used as the core component of power supply voltage conversion, compared with the traditional framework transformer, the existing printed circuit board manufacturing technology is used, the flat transformer which realizes the new process structure of the planar winding of the transformer and even the coil assembly has great advantages in the aspect of improving the characteristics of the switching power supply, and compared with the traditional transformer, the flat transformer has the characteristics of good coupling performance between windings, high efficiency and small magnetic leakage. Meanwhile, the planar transformer is an innovative trend to realize the thinning and high frequency of the transformer, and is widely applied to various switching power supplies with a plurality of advantages of the planar transformer.
In use, to achieve a larger power output of the transformer, the following two methods are mainly adopted: firstly, a plurality of low-power transformers are connected in parallel to form a high-power transformer; secondly, the volume of the transformer is made larger, and more windings are additionally arranged; the two methods can increase the volume of the transformer, and are not in line with the development direction of small volume and high power density of the transformer.
Like installing the transformer in outdoor equipment such as charging pile in addition, rainwater and dust all can directly influence the transformer function, and the rainwater gets into the inside circuit short circuit that easily causes of transformer and burns out the transformer, and the dust of raising in the air is too much, then can produce electrostatic phenomenon, also can lead to the circuit short circuit to catch fire, has the potential safety hazard, and these factors all can influence the safety in utilization performance and the life of transformer.
Disclosure of Invention
The invention aims to provide a flat transformer which is high in integration level, can effectively reduce the occupied space of the transformer, accords with the development direction of small volume and high power density of the transformer, is good in dustproof and rainproof safety performance, is particularly suitable for outdoor equipment, and solves the problems in the background technology.
The purpose of the invention can be realized by the following technical scheme:
a planar transformer comprising a transformer body, the transformer body comprising:
the lower magnetic core comprises a base, two ends of the base are respectively provided with a side plate, the base is further provided with a plurality of elliptic magnetic core center columns, a plurality of heat dissipation through holes are formed in each elliptic magnetic core center column, and the heat dissipation through holes are communicated from the top surfaces of the elliptic magnetic core center columns to the bottom surface of the base;
the upper magnetic core is detachably and fixedly covered on the top of the side plate, and the top of the middle column of each elliptic magnetic core is connected with the bottom of the upper magnetic core;
the winding assembly is arranged in the middle column of the elliptic magnetic core, and each winding assembly is provided with a plurality of primary windings and a plurality of secondary windings.
As a further scheme of the invention: the flat-plate transformer further comprises a protective cover, the transformer body is installed in the protective cover, heat-conducting silica gel is poured into the protective cover, and the heat-conducting silica gel is used for encapsulating the transformer body in the protective cover.
As a further scheme of the invention: two ends of each primary winding on each elliptic magnetic core center post are respectively and electrically connected with different primary pins;
two ends of each secondary winding on each elliptical magnetic core center pillar are respectively and electrically connected with different secondary pins;
the primary pin and the secondary pin both extend through the shield sidewall to outside the shield.
As a further scheme of the invention: the heat dissipation through-hole includes:
the central through hole is formed in the center of the middle column of the oval magnetic core;
and the edge through holes are arranged at the edges of the middle columns of the oval magnetic cores and are uniformly distributed around the central through hole.
As a further scheme of the invention: and heat-conducting silica gel rods are embedded in the central through hole and the edge through holes, the tops of the heat-conducting silica gel rods are embedded in the upper magnetic cores, and the bottoms of the heat-conducting silica gel rods are embedded in the base.
As a further scheme of the invention: the primary winding is a flat coil, and the flat coil is formed by winding a film-covered insulating wire or a three-layer insulating wire.
As a further scheme of the invention: the secondary winding is an annular copper sheet, an elliptical hole is formed in the center of the annular copper sheet, and the annular copper sheet is sleeved on the elliptical magnetic core center column through the elliptical hole.
As a further scheme of the invention: every all set up a setting element on the sideboard, go up magnetic core bottom both sides set up respectively one with the constant head tank of setting element adaptation.
As a further scheme of the invention: the positioning piece comprises a longitudinal strip and two transverse strips, and the two transverse strips are respectively arranged at two ends of the longitudinal strip.
As a further scheme of the invention: the protection casing is aluminium system protection casing, just at least one side of protection casing is provided with the heat dissipation mesh.
The invention has at least the following beneficial effects:
(1) Install on same base through with a plurality of oval magnetic core center pillars, form a plurality of magnetic circuits between last magnetic core and the lower magnetic core, compare in the parallelly connected method of forming a high power transformer of a plurality of low power transformers, the integrated level is higher, occupation space still less, and oval magnetic core center pillar compares in current circular cross section and has improved the Ae (magnetic core effective cross section) value of transformer magnetic core, compare with conventional transformer, under the condition of output equal power, the space that this scheme took is less, under the condition of equal size of volume, higher power output can be realized to this scheme, accord with the transformer small-size, high power density's development direction.
(2) The primary winding and the secondary winding are alternately sleeved on the middle column of the elliptical magnetic core, so that the primary winding and the secondary winding can be closely coupled, the leakage inductance is small, and the power loss is reduced.
(3) Through set up a plurality of heat dissipation through-holes on oval magnetic core center pillar to inlay at every heat dissipation through-hole and establish a heat conduction silica gel stick, can pass to magnetic core and lower magnetic core with the heat that produces in the magnetic core and the winding course of operation fast on, the surface area of going up magnetic core and lower magnetic core is big, the heat dissipation of being convenient for, thereby improves planar transformer's radiating effect.
(4) With the transformer body through heat conduction silica gel encapsulation in the protection casing, heat conduction silica gel not only can be with the firm fixing of flat plate transformer body in the protection casing, can also be with the heat that flat plate transformer produced quick the scattering, the protection casing can improve the dustproof rainproof performance of flat plate transformer in addition, makes flat plate transformer more be applicable to outdoor equipment and uses.
Drawings
The invention will be further described with reference to the accompanying drawings.
Fig. 1 is a perspective view of the overall structure of the planar transformer of the present invention;
FIG. 2 is a perspective view of the lower core structure of the planar transformer according to the present invention;
FIG. 3 is a perspective view of the upper core structure of the planar transformer according to the present invention;
FIG. 4 is a schematic left side sectional view of the planar transformer structure of FIG. 1 according to the present invention;
FIG. 5 is a schematic diagram of the front side of the planar transformer structure of FIG. 1 according to the present invention;
FIG. 6 is a schematic structural view of a heat-conducting silica gel rod of the planar transformer according to the present invention;
fig. 7 is a schematic diagram of the structure of the annular copper sheet of the planar transformer of the invention.
In the figure: 1. a transformer body; 2. a lower magnetic core; 3. a base; 4. a side plate; 5. a center column of the elliptical magnetic core; 6. a heat dissipating through hole; 7. an upper magnetic core; 8. a primary winding; 9. a secondary winding; 10. a protective cover; 11. heat conducting silica gel; 12. a primary pin; 13. a secondary pin; 14. a central through hole; 15. an edge via hole; 16. a heat-conducting silica gel rod; 17. an annular copper sheet; 18. an elliptical hole; 19. a positioning member; 20. positioning a groove; 21. a longitudinal strip; 22. a transverse strip; 23. radiating meshes; 24. and a winding assembly.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-7, the present invention provides a planar transformer, which includes a transformer body 1, wherein the transformer body 1 includes a lower magnetic core 2, an upper magnetic core 7 and a plurality of winding assemblies 24.
The lower magnetic core 2 comprises a base 3, the base 3 is preferably in a structural form that two sides are wide and the middle is narrow, two side plates 4 are respectively arranged at two ends of the base 3, arc-shaped spaces can be formed in the inner sides of the two side plates 4, more winding assemblies 24 can be accommodated between the structures of the two side plates 4 due to the arc-shaped spaces, a plurality of oval magnetic core center columns 5 are further arranged on the base 3, a plurality of heat dissipation through holes 6 are formed in each oval magnetic core center column 5, and the heat dissipation through holes 6 are communicated with the bottom surface of the base 3 through the top surfaces of the oval magnetic core center columns 5; the upper magnetic core 7 is detachably fixed to cover the top of the side plate 4, the top of each elliptic magnetic core center pillar 5 is connected with the bottom of the upper magnetic core 7, the upper magnetic core 7 and the lower magnetic core 2 are preferably ferrite magnetic cores to increase magnetic permeability and improve inductance quality, and the joint of the top of each elliptic magnetic core center pillar 5 and the bottom of the upper magnetic core 7 is preferably bonded by epoxy glue; all overlapping on every oval magnetic core center pillar 5 and establishing a set of winding subassembly 24, every winding subassembly 24 of group all is equipped with a plurality of primary 8 and a plurality of secondary 9, and primary 8 and secondary 9 alternate cover establish on the oval magnetic core center pillar 5 that corresponds, and preferred is provided with still insulating membrane between primary 8 and the secondary 9, improves planar transformer's pressure resistance.
In this scheme, the integrated setting of a plurality of oval magnetic core center pillars 5 is on same base 3, every oval magnetic core center pillar 5 all forms a magnetic circuit between last magnetic core 7 and lower magnetic core 2, for the method that a plurality of low-power transformers connect in parallel into a high-power transformer, the planar transformer integrated level that this scheme provided is higher, occupation space still less, and oval magnetic core center pillar 5 compares in current circular cross section and has improved the Ae (magnetic core effective cross section) value of magnetic core of transformer, under the condition of output equal power, the space that this scheme occupy is less, under the condition of equal size of volume, this scheme can realize higher power output, accord with the transformer small volume, high power density's development direction, and the planar transformer application scope of flat structure is wide, can use widely in various small-size electronic equipment.
In order to make the planar transformer more be applicable to and use in the outdoor equipment, the planar transformer in this scheme still is provided with protection casing 10, protection casing 10 is preferred thermal conductivity strong, light in weight's aluminium material preparation, transformer body 1 installs in protection casing 10, and fill in protection casing 10 and have heat conduction silica gel 11, heat conduction silica gel 11 is used for encapsulating transformer body 1 in protection casing 10, heat conduction silica gel 11 not only can firmly fix planar transformer body 1 in protection casing 10, can also be with transformer body 1 in the use produced heat conduction on protection casing 10, protection casing 10 dispels the heat fast, protection casing 10 can also improve the dustproof rainproof ability of planar transformer in addition, make the planar transformer more be applicable to the outdoor equipment and use, improve the security of the outdoor use of planar transformer, and then, can set up heat dissipation mesh 23 in protection casing 10 at least one side, the radiating mesh 23 strengthens the radiating effect of protection casing 10.
Further, in the present embodiment, two ends of each primary winding 8 on each elliptical magnetic core center pillar 5 are electrically connected to different primary pins 12 respectively; two ends of each secondary winding 9 on each elliptical magnetic core center post 5 are respectively and electrically connected with different secondary pins 13; the primary pin 12 and the secondary pin 13 both extend out of the shield 10 through the side wall of the shield 10, and when the flat-plate transformer works, the primary pin 12 and the secondary pin 13 play a role of conducting electricity, the primary pin 12 is used for being connected with a power supply, and the secondary pin 13 is used for being connected with external equipment.
As shown in fig. 2, in the present embodiment, the heat dissipating through hole 6 specifically includes a central through hole 14 and a plurality of edge through holes 15, the central through hole 14 is opened at the center of the center pillar 5 of the elliptical magnetic core; edge through hole 15 is seted up in the edge of oval magnetic core center pillar 5, a plurality of edge through holes 15 evenly distributed in around central through hole 14, it is preferred, when winding subassembly 24 cover is established on oval magnetic core center pillar 5, winding subassembly 24 strides across edge through hole 15, the heat that winding subassembly 24 produced distributes in a plurality of edge through holes 15, the heat that produces in oval magnetic core center pillar 5 distributes through central through hole 14, under the combined action of central through hole 14 and edge through hole 15, pass on magnetic core 7 and lower magnetic core 2 with the heat that produces in the working process of magnetic core and winding subassembly 24 fast, go up magnetic core 7 and the surface area of magnetic core 2 down big, the heat dissipation of being convenient for, thereby improve the radiating effect of slab transformer, it is preferred, as shown in figure 6, all inlay in central through hole 14 and edge through hole 15 and establish a heat conduction silica gel stick 16, in the magnetic core 7 is gone up in the embedding of heat conduction silica gel stick 16 top, in the embedding base 3 in the heat conduction silica gel stick 16 bottom, heat conduction stick 16 can be more quick with the heat in central through hole 14 and the edge through hole 15 on magnetic core 7 and the magnetic core 2, thereby further improve the radiating effect of slab transformer.
In order to make the planar transformer smaller in size and flatter, in the present embodiment, the primary winding 8 is a flat coil, and the flat coil is formed by winding a film-covered insulated wire or a three-layer insulated wire, and the film-covered insulated wire has the advantages of high voltage resistance and good shielding performance; the three-layer insulated wire has the advantages that the wire is provided with three insulating layers, the core wire is arranged in the middle of the wire, higher safe voltage can be borne between any two layers, and the insulating degree is high; the secondary winding 9 is set to be the annular copper sheet 17, and the annular copper sheet 17 electric conductive property is good, and mechanical strength is high, and the heat conductivity is high, makes the planar transformer volume littleer, and is more platyzized, and the radiating effect is better, and the elliptical hole 18 has been seted up to annular copper sheet 17 center department, and the annular copper sheet 17 is located on the elliptical magnetic core center pillar 5 through the elliptical hole 18 cover, and simple to operate improves planar transformer's packaging efficiency.
Compared with the conventional transformer which is composed of a single magnetic core, a plurality of primary windings and a secondary winding, some magnetic fluxes of the primary windings are not coupled to the secondary winding, and the leakage inductance is large.
In the embodiment, a plurality of primary windings 8 are connected in parallel on an elliptic magnetic core center pillar 5 to form an input end of a transformer, a plurality of secondary windings 9 are connected in parallel on the same elliptic magnetic core center pillar 5 to form an output end of the transformer, one elliptic magnetic core center pillar 5 and one group of winding assemblies 24 are opposite to a small-sized transformer, a plurality of small-sized transformers are integrated in one magnetic core, compared with a plurality of conventional transformers which are connected in parallel, under the condition of realizing the same power output, the flat transformer has higher integration degree and relatively smaller occupied space, in the flat transformer with multiple elliptic magnetic core center pillars 5, even if one magnetic circuit is damaged, the rest magnetic circuits and the parallel windings can still work normally, and the whole transformer can not work as long as one part of the conventional transformer is damaged.
It can be understood, in order to make magnetic core 7 can be more firm, accurate installation under on magnetic core 2, all set up a setting element 19 on every sideboard 4 of magnetic core 2 down, go up magnetic core 7 bottom both sides and set up one respectively with the constant head tank 20 of setting element 19 adaptation, preferably, setting element 19 includes a vertical strip 21 and two horizontal strips 22, two horizontal strips 22 set up respectively in vertical strip 21 both ends, when the installation, through in with vertical strip 21 and horizontal strip 22 block to constant head tank 20, make on magnetic core 7 accurate location is installed under to magnetic core 2, prevent that magnetic core 7 from taking place the off normal, influence flat-plate transformer's result of use.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation and a specific orientation configuration and operation, and thus, should not be construed as limiting the present invention.
In addition, unless expressly stated or limited otherwise, the terms "mounted," "connected," "coupled," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral connections; can be mechanically or electrically connected; they may be directly connected or indirectly connected through an intermediate member, or they may be connected through two or more elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The above detailed description of the preferred embodiments of the present invention should not be taken as limiting the scope of the invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (10)
1. A planar transformer comprising a transformer body (1), characterized in that the transformer body (1) comprises:
the lower magnetic core (2) comprises a base (3), two side plates (4) are arranged at two ends of the base (3) respectively, a plurality of elliptical magnetic core center columns (5) are further arranged on the base (3), a plurality of heat dissipation through holes (6) are formed in each elliptical magnetic core center column (5), and the heat dissipation through holes (6) are communicated from the top surfaces of the elliptical magnetic core center columns (5) to the bottom surface of the base (3);
the upper magnetic cores (7) are detachably and fixedly covered on the tops of the side plates (4), and the top of each middle column (5) of the oval magnetic core is connected with the bottom of each upper magnetic core (7);
multiunit winding subassembly (24), every all overlap on oval magnetic core center pillar (5) and establish a set ofly winding subassembly (24), every group winding subassembly (24) all are equipped with a plurality of primary (8) and a plurality of secondary (9), primary (8) with secondary (9) cover is established in turn and is corresponded on oval magnetic core center pillar (5).
2. The planar transformer according to claim 1, further comprising a protective cover (10), wherein the transformer body (1) is installed in the protective cover (10), and the protective cover (10) is further filled with a heat-conducting silica gel (11), and the heat-conducting silica gel (11) is used for encapsulating the transformer body (1) in the protective cover (10).
3. A planar transformer according to claim 2, wherein the two ends of each primary winding (8) on each leg (5) of the elliptical magnetic core are electrically connected to different primary pins (12);
two ends of each secondary winding (9) on each elliptical magnetic core center post (5) are respectively and electrically connected with different secondary pins (13);
the primary pin (12) and the secondary pin (13) both extend through the side wall of the shield (10) to the outside of the shield (10).
4. A planar transformer according to claim 1, characterized in that said heat dissipating through-holes (6) comprise:
the central through hole (14) is formed in the center of the elliptic magnetic core center post (5);
a plurality of edge through holes (15) are opened at the edge of the elliptical magnetic core center pillar (5), and the edge through holes (15) are uniformly distributed around the center through hole (14).
5. The planar transformer according to claim 4, wherein a heat conductive silicone rod (16) is embedded in each of the central through hole (14) and the edge through hole (15), the top of the heat conductive silicone rod (16) is embedded in the upper magnetic core (7), and the bottom of the heat conductive silicone rod (16) is embedded in the base (3).
6. A planar transformer according to claim 1, wherein the primary winding (8) is a flat coil, and the flat coil is wound by using a film-wrapped insulated wire or a three-layer insulated wire.
7. The planar transformer according to claim 1, wherein the secondary winding (9) is an annular copper sheet (17), an elliptical hole (18) is formed in the center of the annular copper sheet (17), and the annular copper sheet (17) is sleeved on the elliptical magnetic core center pillar (5) through the elliptical hole (18).
8. The planar transformer according to claim 1, wherein each side plate (4) is provided with a positioning element (19), and two sides of the bottom of the upper magnetic core (7) are respectively provided with a positioning slot (20) matched with the positioning element (19).
9. A planar transformer according to claim 8, wherein said positioning member (19) comprises a longitudinal bar (21) and two transverse bars (22), said two transverse bars (22) being respectively disposed at two ends of said longitudinal bar (21).
10. A planar transformer according to claim 2, characterized in that the enclosure (10) is an aluminium enclosure (10) and that at least one side of the enclosure (10) is provided with heat dissipating meshes (23).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310266573.8A CN115985640A (en) | 2023-03-20 | 2023-03-20 | Flat transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310266573.8A CN115985640A (en) | 2023-03-20 | 2023-03-20 | Flat transformer |
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| Publication Number | Publication Date |
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| CN115985640A true CN115985640A (en) | 2023-04-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310266573.8A Pending CN115985640A (en) | 2023-03-20 | 2023-03-20 | Flat transformer |
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| CN (1) | CN115985640A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118486530A (en) * | 2024-07-09 | 2024-08-13 | 深圳市斯比特技术股份有限公司 | Energy-saving environment-friendly high-frequency transformer |
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| CN118486530A (en) * | 2024-07-09 | 2024-08-13 | 深圳市斯比特技术股份有限公司 | Energy-saving environment-friendly high-frequency transformer |
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