CN217655742U - Transformer structure, planar transformer and electronic equipment - Google Patents
Transformer structure, planar transformer and electronic equipment Download PDFInfo
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- CN217655742U CN217655742U CN202220694733.XU CN202220694733U CN217655742U CN 217655742 U CN217655742 U CN 217655742U CN 202220694733 U CN202220694733 U CN 202220694733U CN 217655742 U CN217655742 U CN 217655742U
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Abstract
The utility model belongs to the technical field of the transformer, a transformer structure is provided, flat-plate transformer and electronic equipment, wherein, transformer structure includes the PCB board, primary winding, secondary winding, the PCB board is at least including the first metal level of range upon range of setting gradually, the second metal level, primary winding sets up in first metal level, secondary winding sets up in the second metal level, it is opposite with secondary winding's line direction to walk through setting up primary winding, make secondary winding's induction magnetic field opposite with primary winding's induction magnetic field, realize magnetism cancellation, thereby reduce the EMI of transformer from structural design, avoid additionally increasing the use that suppresses components and parts, reach the effect that effectively reduces EMI.
Description
Technical Field
The utility model belongs to the technical field of the transformer design, especially, relate to a transformer structure, flat-plate transformer and electronic equipment.
Background
With the increasing density of power supply devices, miniaturization or portability is required. The winding transformer is easy to cause the error of the number of turns on the winding and cannot be reduced in thickness due to the diameter of the wire and the thickness of the wire, so the thickness is reduced by adopting a PCB (printed circuit board) mode.
However, magnetic elements (such as a transformer and an inductor) are large emitting objects with EMI (electromagnetic interference), and in order to reduce the EMI, additional suppression components are required, which results in a large volume.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a transformer structure, planar transformer and electronic equipment aims at solving the great problem of EMI that present transformer structure exists.
An embodiment of the utility model provides a transformer structure, transformer structure includes:
the PCB at least comprises a first metal layer and a second metal layer which are sequentially stacked;
the primary winding is arranged on the first metal layer;
and the secondary winding is arranged on the second metal layer, and the wiring direction of the secondary winding is opposite to the wiring direction of the primary winding.
In one embodiment, the PCB board further comprises a third metal layer adjacent to the second metal layer;
the transformer structure further includes: and the auxiliary winding is arranged on the third metal layer.
In one embodiment, the auxiliary winding is routed in a direction opposite to the secondary winding.
In one embodiment, the secondary winding comprises at least 2 coil windings; and/or
The primary winding comprises at least 2 coil windings.
In one embodiment, the primary winding, the secondary winding, and the auxiliary winding are made of printed circuit board foil.
In one embodiment, the wired end or pin of the auxiliary winding is grounded.
In one embodiment, the number of turns of the primary winding is different from the number of turns of the secondary winding.
The utility model discloses the second aspect still provides a planar transformer, planar transformer includes as above-mentioned arbitrary transformer structure.
The utility model discloses the third aspect still provides an electronic equipment, electronic equipment includes as above-mentioned planar transformer.
In one embodiment, the electronic device further comprises:
the power switch tube and the diode are connected with the flat-plate transformer.
The embodiment of the application provides a transformer structure, a flat-plate transformer and electronic equipment, wherein, the transformer structure includes the PCB board, the primary winding, the secondary winding, the PCB board is at least including the first metal layer, the second metal layer that stack gradually and set up, the primary winding sets up in the first metal layer, the secondary winding sets up in the second metal layer, the induced magnetic field of secondary winding is opposite with the induced magnetic field of primary winding, through primary winding and secondary winding according to the opposite of directionality, realize magnetism cancellation, thereby reduce the EMI of transformer from structural design, avoid additionally increasing the use that restraines components and parts, reach the effect that effectively reduces EMI.
Drawings
Fig. 1 is a schematic structural diagram of a transformer structure according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a transformer structure according to another embodiment of the present application.
PCB board: 100;
primary winding: 210;
secondary side winding: 220;
auxiliary winding: 230;
a first metal layer: 110;
a second metal layer 120;
a third metal layer 130.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application 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 and not restrictive on the broad application.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, refer to an orientation or positional relationship illustrated in the drawings for convenience in describing the present application and to simplify description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
Magnetic components (such as transformers and inductors) are large scattering objects of EMI, and the winding method affects the result of EMI, so that the EMI effect needs to be improved by a copper wiring method on the PCB in order to reduce or eliminate external EMI components.
The embodiment of the present invention provides a transformer structure, which is shown in fig. 1 and includes a PCB board 100, a primary winding 210, and a secondary winding 220.
Specifically, the PCB 100 at least includes a first metal layer 110 and a second metal layer 120 stacked in sequence, the primary winding 210 is disposed on the first metal layer 110, the output winding 220 is disposed on the second metal layer 120, and a routing direction of the secondary winding 220 is opposite to a routing direction of the primary winding 210.
In this embodiment, the primary winding 210 and the secondary winding 220 are arranged in a wiring manner opposite to each other, so that EMI can be reduced, external EMI components can be reduced or eliminated, and the size of the transformer can be reduced.
In a specific application embodiment, the transformer structure is applied to a flat-plate transformer, the PCB board 100 is washed in a multi-layer manner, the coil of the PCB board can be made of a flat copper foil, the coil of the primary winding 210 is etched in the first metal layer 110, the coil of the secondary winding 220 is etched in the second metal layer 120, and the routing directions of the primary winding 210 and the secondary winding 220 are opposite, so that magnetic cancellation can be realized, thereby reducing the EMI of the transformer in terms of structural design, avoiding the use of additional suppression components, and achieving the effect of effectively reducing the EMI.
Further, an insulating layer is disposed between the first metal layer 110 and the second metal layer 120 for physically isolating the first metal layer 110 from the second metal layer 120.
Further, the coil width of the primary winding 210 is the same as the coil width of the secondary winding 220.
In this embodiment, by setting the coil width of the primary winding 210 to be the same as the coil width of the secondary winding 220, the same flat copper foil etching process may be used to etch each metal layer in the PCB to form a corresponding winding.
Further, the flat copper foil used in the primary winding 210 and the secondary winding 220 has the same thickness.
In this embodiment, by setting the thicknesses of the flat copper foils used in the primary winding 210 and the secondary winding 220 to be the same, a multi-layer PCB board with the same metal layer thickness can be used, and each metal layer in the PCB is etched by the same flat copper foil etching process to form a corresponding winding.
In specific application, the primary winding 210 and the secondary winding 220 are different in winding mode, the number of turns of the coil required by winding in the interlayer achieves the effect of changing the voltage proportion through the proportion of the number of turns, and the primary winding 210 and the secondary winding 220 can achieve magnetic cancellation according to the opposite direction of the directions, so that the EMI of the transformer is reduced from the structural design, the use of extra increase suppression components is avoided, and the effect of effectively reducing the EMI is achieved.
In one embodiment, referring to fig. 2, the PCB board 100 further includes a third metal layer 130, and the transformer structure further includes an auxiliary winding 230, wherein the auxiliary winding 230 is disposed on the third metal layer 130.
The coil of the auxiliary winding 230 may be made of a flat copper foil, the coil of the auxiliary winding 230 is etched on the third metal layer 130, the coil of the secondary winding 220 is etched on the second metal layer 120, and the routing direction of the third metal layer 130 is opposite to that of the secondary winding 220.
Further, an insulating layer is disposed between the third metal layer 130 and the second metal layer 120 for physically isolating the third metal layer 130 from the second metal layer 120.
Further, the coil width of the auxiliary winding 230 is the same as that of the secondary winding 220.
Further, the auxiliary winding 230 is the same thickness as the flat copper foil used in the secondary winding 220.
In one embodiment, adjacent metal layers in the PCB 100 are isolated from each other by an insulating material.
Specifically, the PCB 100 is a multi-layer circuit board, for example, a double-sided board is a medium layer in the middle, and two sides are wiring layers.
In a specific application, the multilayer board is a multilayer routing layer, a dielectric layer is arranged between every two layers, and the thickness of the dielectric layer is less than 2mm.
In this embodiment, the multi-layer circuit board has at least three conductive layers, two of which are on the outer surface and the remaining one is combined in the insulating board, and the three conductive layers are the first metal layer 110, the second metal layer 120 and the third metal layer 130 in sequence, and the electrical connection can be realized by providing plated through holes on the cross section of the circuit board.
In one embodiment, the primary winding 210 and the secondary winding 220 may be spiral inductors, and the spiral inductors in the primary winding 210 and the secondary winding 220 are routed in a direction opposite to the secondary winding 220.
In this embodiment, referring to fig. 1, the routing direction of the primary winding 210 is opposite to the routing direction of the secondary winding 220, and the arrow direction in the figure generally refers to the direction of the wire in the slot or the direction of the metal wire in the PCB.
When the transformer works, the current directions are opposite, the induction magnetic fields are opposite, the magnetism is cancelled, the EMI can be reduced in the transformer by the magnetic force part, and the effect of effectively reducing the EMI of the whole power supply is achieved.
In one embodiment, the auxiliary winding 230 is routed in a direction opposite to the secondary winding 220.
In the present embodiment, the primary winding 210 and the secondary winding 220 are routed in opposite directions, and the auxiliary winding 230 is routed in opposite directions to the secondary winding 220.
In one embodiment, the secondary winding 220 includes at least 2 coil windings.
In one embodiment, the primary winding 210 includes at least 2 coil windings.
In this embodiment, the number of the coil windings of the secondary winding 220 may be set according to the application requirements, for example, three defined coil windings may be added, and in a specific application, the primary winding 210 may be changed into two or more windings, or the secondary winding 220 may be changed into two or more windings.
In one embodiment, the primary winding 210, the secondary winding 220, and the auxiliary winding 230 are made of PCB foil.
Specifically, flat copper foils can be formed on a PCB board by using a PCB wash copper foil as winding coils of the primary winding 210, the secondary winding 220, and the auxiliary winding 230.
Referring to fig. 2, arrows in fig. 2 indicate winding directions, and the primary winding 210 and the secondary winding 220 must be routed in opposite directions, so as to reduce the magnetic force.
Further, in the PCB 100, the layer is fully paved with copper in a layer mode, so as to achieve a better coupling effect.
In one embodiment, the wired end or pin of the auxiliary winding 230 is grounded.
In this embodiment, the auxiliary winding 230 is made of a PCB copper foil, and one end thereof may be grounded through a ground terminal on the PCB.
Specifically, a flat copper foil may be formed on the PCB board by using a PCB wash copper foil as the winding coil of the auxiliary winding 230.
In a particular application, the number of turns of the auxiliary winding 230 may be defined according to user requirements.
In one embodiment, the number of turns of the primary winding 210 is the same as the number of turns of the secondary winding 220.
In one embodiment, the number of turns of the primary winding 210 and the number of turns of the secondary winding 220 may be different, and the specific number of turns may be set according to the user's requirement.
Specifically, the primary winding 210, the secondary winding 220 and the auxiliary winding 230 are wound in different winding modes, the number of turns of the coil required for winding in the interlayer achieves the effect of changing the voltage proportion through the proportion of the number of turns, and the primary winding 210 and the secondary winding 220 can achieve magnetic cancellation according to the opposite direction of the directions, so that the EMI of the transformer is reduced from the structural design, the use of extra increase suppression components is avoided, and the effect of effectively reducing the EMI is achieved.
The embodiment of the utility model provides a still provide a planar transformer, planar transformer includes as above-mentioned arbitrary transformer structure.
The flat-plate transformer can reduce the thickness of a traditional wire in a mode of using a copper washing foil to replace a copper wire due to the fact that the PCB is flat, and is applied to an Alternating Current (AC) power supply or a Direct Current (DC) power supply, so that the design volume of the power supply can be smaller, and the future thinning becomes the mainstream.
The embodiment of the utility model provides an electronic equipment is still provided, electronic equipment includes as above-mentioned planar transformer.
In one embodiment, the electronic device further comprises a power switch tube, a diode;
the power switch tube and the diode are connected with the flat-plate transformer.
In one specific application, the power switch tube is connected in series with the primary winding of the flat-plate transformer, and the diode is connected in series with the secondary winding of the flat-plate transformer.
In addition to the path from the power switch tube to the ground corresponding to the transformer, the Noise Voltage (Noise Voltage) received by the power switch tube couples the Noise current (Noise current) to the loop where the secondary side (i.e. the secondary side winding) of the transformer is located through the parasitic capacitance of the transformer, and then couples the Noise current (Noise current) to the ground through the parasitic capacitance of the secondary side loop to the ground is also the path for generating the Common mode current, so that the Common mode current transferred from the primary side winding (i.e. the primary side winding) of the transformer to the secondary side winding can be reduced.
The embodiment of the application provides a transformer structure, a flat-plate transformer and electronic equipment, wherein the transformer structure comprises a PCB (printed circuit board), a primary winding and a secondary winding, the PCB at least comprises a first metal layer and a second metal layer which are sequentially stacked, the primary winding is arranged on the first metal layer, the secondary winding is arranged on the second metal layer, an induction magnetic field of the secondary winding is opposite to that of the primary winding, and magnetic cancellation is realized through the primary winding and the secondary winding according to the opposite of the directivity, so that the EMI (electro-magnetic interference) of the transformer is reduced in structural design, the use of additional suppression components is avoided, and the effect of effectively reducing the EMI is achieved.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Each functional unit in the embodiments of the present application may be integrated into one unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (10)
1. A transformer structure, characterized in that the transformer structure comprises:
the PCB board at least comprises a first metal layer and a second metal layer;
the primary winding is arranged on the first metal layer;
and the secondary winding is arranged on the second metal layer, and the wiring direction of the secondary winding is opposite to the wiring direction of the primary winding.
2. The transformer structure of claim 1, wherein the PCB board further comprises a third metal layer adjacent to the second metal layer;
the transformer structure further includes: and the auxiliary winding is arranged on the third metal layer.
3. The transformer structure of claim 2, wherein the auxiliary winding runs in a direction opposite to that of the secondary winding.
4. The transformer structure of claim 1, wherein the secondary winding comprises at least 2 coil windings; and/or
The primary winding includes at least 2 coil windings.
5. The transformer structure of claim 2, wherein the primary winding, the secondary winding, and the auxiliary winding are formed of printed circuit board foil.
6. The transformer structure of claim 2, wherein a wire end or pin of the auxiliary winding is grounded.
7. The transformer structure according to any of claims 1 to 5, characterized in that the number of turns of the primary winding is different from the number of turns of the secondary winding.
8. A planar transformer, characterized in that it comprises a transformer structure according to any one of claims 1-7.
9. An electronic device, characterized in that it comprises a planar transformer according to claim 8.
10. The electronic device of claim 9, wherein the electronic device further comprises:
the power switch tube and the diode are connected with the flat-plate transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220694733.XU CN217655742U (en) | 2022-03-28 | 2022-03-28 | Transformer structure, planar transformer and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220694733.XU CN217655742U (en) | 2022-03-28 | 2022-03-28 | Transformer structure, planar transformer and electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217655742U true CN217655742U (en) | 2022-10-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220694733.XU Active CN217655742U (en) | 2022-03-28 | 2022-03-28 | Transformer structure, planar transformer and electronic equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217655742U (en) |
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2022
- 2022-03-28 CN CN202220694733.XU patent/CN217655742U/en active Active
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