Planar transformer

Abstract

The planar transformer comprises an iron core, a printed circuit board (PCB) and a winding, the PCB and the winding are arranged in a stacked mode, the iron core is fixed on the PCB to form a closed magnetic circuit, the winding is provided with a thin copper layer, the sectional areas of wires of the thin copper layer are equal, and the winding is provided with a secondary winding and a primary winding. The secondary windings and the primary windings are alternately stacked on the multi-layer PCB, the secondary windings are primary windings, the number of turns of the secondary windings is a first secondary winding layer, a second secondary winding layer, a third secondary winding layer and a fourth secondary winding layer in sequence, the primary windings are secondary windings, the number of turns of the primary windings is a first, a second, a third and a fourth secondary winding layers in sequence, and the number of turns of the secondary windings is a second. The four secondary winding layers are a first secondary winding layer, a second secondary winding layer, a third secondary winding layer, a fourth secondary winding layer, a fifth secondary winding layer and a sixth secondary winding layer in sequence. The beneficial effects of the utility model are that: simple structure, small volume, space saving, suitability for occasions with limited space, high efficiency, low leakage inductance, low EMI radiation, and high insulativity.

Description

TECHNICAL FIELD

[0001] The utility model relates to transformer technical field, concretely, relate to the improvement of planar transformer. BACKGROUND

[0002] With the rapid development of electronic technology, electronic equipment is increasingly miniaturized, lightweight, and the volume and performance requirements of internal components are increasingly stringent. The traditional transformer has many limitations in space utilization and heat dissipation due to its three-dimensional structure, and it is difficult to meet the needs of modern electronic equipment. As a new type of transformer, planar transformer gradually attracts widespread attention due to its unique structural advantages. However, the existing planar transformer still has problems such as large winding loss, low magnetic permeability of the magnetic core, and unsatisfactory heat dissipation effect in winding design, magnetic core structure and heat dissipation performance, which affects the overall performance and reliability of the transformer. SUMMARY

[0003] In view of the shortcomings of the prior art, the utility model provides a planar transformer, which has the advantages of simple structure, small size, space saving, and suitability for limited space, thereby solving the problem that the traditional transformer has many limitations in space utilization and heat dissipation due to its three-dimensional structure, and it is difficult to meet the needs of modern electronic equipment.

[0004] To achieve the above-mentioned advantages of simple structure, small size, space saving and suitability for limited space, the utility model adopts the following specific technical solutions: it comprises a core, a plurality of PCB circuit boards arranged in a stacked manner and a winding, the core is fixed on the PCB circuit board to form a closed magnetic circuit, the winding is composed of thin copper layers, an insulating layer is arranged between the thin copper layers, the cross-sectional area of the conductors of the thin copper layers is equal, the winding is provided with a secondary winding and a primary winding, the secondary winding and the primary winding are alternately stacked on the plurality of PCB circuit boards.

[0005] Further, the secondary winding is provided with a solder pad S, a solder pad F, a via A, a via B, a via C and a via D, the solder pad S and the solder pad F are connected to a circuit node or a component pin, the secondary winding is provided with a plurality of groups, the secondary winding is a primary winding, and the number of turns is 4, in order of a first secondary winding layer, a second secondary winding layer, a third secondary winding layer and a fourth secondary winding layer, the first secondary winding layer and the second secondary winding layer are connected through the via A, the second secondary winding layer and the third secondary winding layer, and the fourth secondary winding layer are connected through the via B, the third secondary winding layer and the fourth secondary winding layer are connected through the via C and the via D.

[0006] Further, the first secondary winding layer, the second secondary winding layer, the third secondary winding layer and the fourth secondary winding layer are each provided with two layers, and the copper thickness is 7oz.

[0007] Further, the primary winding is provided with soldering pads SS, vias X, vias Y, vias U, vias V and vias Z, the primary winding is a secondary winding, and the number of turns is 6 turns, sequentially being a first primary winding layer, a second primary winding layer, a third primary winding layer, a fourth primary winding layer, a fifth primary winding layer and a sixth primary winding layer, the first primary winding layer and the second primary winding layer are conducted through the vias U, the first primary winding layer, the second primary winding layer and the third primary winding layer are conducted through the vias V, the third primary winding layer and the fourth primary winding layer are conducted through the vias X, the fourth primary winding layer and the fifth primary winding layer are conducted through the vias Y, and the fifth primary winding layer and the sixth primary winding layer are conducted through the vias Z.

[0008] Further, the first primary winding layer, the second primary winding layer, the third primary winding layer, the fourth primary winding layer, the fifth primary winding layer and the sixth primary winding layer are all provided with two layers, and the copper thickness is 4 oz.

[0009] Further, the transformer is further provided with a shell, and the shell is a magnetic core shielding shell.

[0010] Compared with the prior art, the plane transformer has the following beneficial effects:

[0011] It has the advantages of simple structure, small size, space saving, suitability for occasions with limited space, close fixing of the winding on the iron core, short distance between the winding and the iron core, increased magnetic flux density, improved transformer magnetization density, high efficiency, low leakage inductance, low EMI radiation and high insulation. BRIEF DESCRIPTION OF DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0013] Figure 1 is a structural schematic view of the present application;

[0014] Figure 2 is one of the structural schematic views of the interior of the present application;

[0015] Figure 3 is the second of the structural schematic views of the interior of the present application;

[0016] Figure 4 is a structural schematic view of the present application;

[0017] Figure 5 is a structural schematic view of the utility model.

[0018] In the figure: iron core 1, PCB circuit board 2, winding 3, secondary winding 31, primary winding 32, first secondary winding layer 311, second secondary winding layer 312, third secondary winding layer 313, fourth secondary winding layer 314, first primary winding layer 321, second primary winding layer 322, third primary winding layer 323, fourth primary winding layer 324, fifth primary winding layer 325, sixth primary winding layer 326. DETAILED DESCRIPTION

[0019] To further illustrate the embodiments, the utility model provides with the drawing, these drawings are the part of the utility model disclosure, it mainly used to illustrate the embodiment, and can cooperate the relevant description of the specification to explain the operating principle of the embodiment, cooperate with reference to these contents, the person skilled in the art should be able to understand other possible implementation ways and the advantages of the utility model, the components in the drawing are not drawn according to scale, and similar component symbols are usually used to represent similar components.

[0020] According to the embodiment of the utility model, a planar transformer is provided.

[0021] The utility model will be further illustrated by combining with the specific embodiment and the drawing, as shown in Figures 1-5 A planar transformer according to the embodiment of the utility model, it includes iron core 1, the PCB circuit board 2 and winding 3 of laminated setting, the iron core 1 is fixed on the PCB circuit board 2 to form closed magnetic circuit, the winding 3 is provided with thin copper layer, and the insulating layer is arranged between the array thin copper layer, and the wire cross-sectional area of thin copper layer is equal, winding 3 is provided with secondary winding 31 and primary winding 32, the secondary winding 31 and primary winding 32 are alternately stacked on multilayer PCB circuit board 2, the secondary winding 31 is provided with multiple groups, the secondary winding 31 is primary winding, and the number of turns is 4 turns, and it is first secondary winding layer 311, second secondary winding layer 312, third secondary winding layer 313 and fourth secondary winding layer 314 in turn, the primary winding 32 is secondary winding, and the number of turns is 6 turns, and it is first primary winding layer 321, second primary winding layer 322, third primary winding layer 323, fourth primary winding layer 324, fifth primary winding layer 325 and sixth primary winding layer 326 in turn.

[0022] In one embodiment, the iron core 1 is made of a new type of high magnetic permeability, low loss ferrite material or amorphous alloy material. It is closely attached to the multilayer PCB circuit board 2 to form a closed magnetic circuit, ensuring efficient transmission and concentration of the magnetic field.

[0023] In one embodiment, the secondary winding 31 is provided with solder pads S, solder pads F, vias A, vias B, vias C and vias D, the solder pads S and the solder pads F are connected to circuit nodes or element pins, the first secondary winding layer 311 and the second secondary winding layer 312 are connected through the vias A, the second secondary winding layer 312 and the third secondary winding layer 313 and the fourth secondary winding layer 314 are connected through the vias B, and the third secondary winding layer 313 and the fourth secondary winding layer 314 are connected through the vias C and the vias D.

[0024] In one embodiment, the first secondary winding layer 311, the second secondary winding layer 312, the third secondary winding layer 313 and the fourth secondary winding layer 314 are each provided with two layers, and the copper thickness is 7oz.

[0025] In one embodiment, the primary winding 32 is provided with solder pads SS, vias X, vias Y, vias U, vias V and vias Z, the first primary winding layer 321 and the second primary winding layer 322 are connected through the vias U, the first primary winding layer 321 and the second primary winding layer 322 and the third primary winding layer 323 are connected through the vias V, the third primary winding layer 323 and the fourth primary winding layer 324 are connected through the vias X, the fourth primary winding layer 324 and the fifth primary winding layer 325 are connected through the vias Y, and the fifth primary winding layer 325 and the sixth primary winding layer 326 are connected through the vias Z.

[0026] In one embodiment, the first primary winding layer 321, the second primary winding layer 322, the third primary winding layer 323, the fourth primary winding layer 324, the fifth primary winding layer 325 and the sixth primary winding layer 326 are each provided with two layers, and the copper thickness is 4oz.

[0027] In one embodiment, the transformer is further provided with a shell 5, which is a magnetic core shielding shell. The main function is to shield the magnetic field generated by the core, reduce the electromagnetic interference to the outside, and protect the internal winding 3 and core 1 components.

[0028] Working principle: First, connect the primary winding 32 of the transformer to the external power supply through the solder pads SS and the like, and connect the secondary winding 31 to the load circuit through the solder pads S and the solder pads F. Ensure firm connection, no false welding, short circuit and the like. After turning on the power supply, the transformer starts to work, the current in the primary winding 32 generates a changing magnetic field in the core 1, and the magnetic field induces an electromotive force in the secondary winding 31, thereby realizing the transmission of energy from the primary side to the secondary side and voltage transformation.

[0029] In the utility model, unless another definite provision and limitation, the term "installation", "arrangement", "connection", "fixation", "screw connection" and so on term should do the broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be the communication or the interaction relationship of two elements inside two elements, unless another definite limitation, for the ordinary skill in the art, can understand the specific meaning of the above-mentioned term in the utility model according to the specific situation.

[0030] The above only is the preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement, improvement etc. that is made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A planar transformer, characterized in that: It includes an iron core (1), a PCB circuit board (2) stacked on top of each other, and windings (3). The iron core (1) is fixed on the PCB circuit board (2) to form a closed magnetic circuit. The windings (3) are provided with thin copper layers, and insulating layers are provided between the thin copper layers. The cross-sectional areas of the conductors in the thin copper layers are equal. The windings (3) are provided with secondary windings (31) and primary windings (32). The secondary windings (31) and primary windings (32) are stacked alternately on the multi-layer PCB circuit board (2). There are multiple sets of secondary windings (31). The secondary winding (31) is the primary winding with 4 turns, and consists of the first secondary winding layer (311), the second secondary winding layer (312), the third secondary winding layer (313), and the fourth secondary winding layer (314) in sequence. The primary winding (32) is the secondary winding with 6 turns, and consists of the first primary winding layer (321), the second primary winding layer (322), the third primary winding layer (323), the fourth primary winding layer (324), the fifth primary winding layer (325), and the sixth primary winding layer (326) in sequence.

2. A planar transformer according to claim 1, characterized in that: The secondary winding (31) is provided with pad S, pad F, via A, via B, via C and via D. Pad S and pad F are connected to circuit nodes or component pins.

3. A planar transformer according to claim 1, characterized in that: The first secondary winding layer (311), the second secondary winding layer (312), the third secondary winding layer (313), and the fourth secondary winding layer (314) are all provided with two layers and the copper thickness is 7oz. The first secondary winding layer (311) and the second secondary winding layer (312) are connected through via A. The second secondary winding layer (312) is connected to the third secondary winding layer (313) and the fourth secondary winding layer (314) through via B. The third secondary winding layer (313) and the fourth secondary winding layer (314) are connected through via C and via D.

4. A planar transformer according to claim 1, characterized in that: The primary winding (32) is provided with pad SS, via X, via Y, via U, via V and via Z.

5. A planar transformer according to claim 1, characterized in that: The first primary winding layer (321), the second primary winding layer (322), the third primary winding layer (323), the fourth primary winding layer (324), the fifth primary winding layer (325), and the sixth primary winding layer (326) are all provided with two layers, and the copper thickness is 4oz. The first primary winding layer (321) and the second primary winding layer (322) are connected through via U. The first primary winding layer (321) and the second primary winding layer (322) and the third primary winding layer (323) are connected through via V. The third primary winding layer (323) and the fourth primary winding layer (324) are connected through via X. The fourth primary winding layer (324) and the fifth primary winding layer (325) are connected through via Y. The fifth primary winding layer (325) and the sixth primary winding layer (326) are connected through via Z.

6. A planar transformer according to claim 1, characterized in that: The transformer is also provided with a housing (5), which is a magnetic core shielding shell.

Images