Transformer, power supply mainboard and power supply adapter

Abstract

The utility model discloses a transformer, a power supply mainboard and a power supply adapter. The transformer comprises a PCB (Printed Circuit Board), a magnetic core assembly and at least two transformer windings, a through hole is formed in the PCB, and the PCB comprises at least two layers of substrates; the magnetic core assembly comprises a first magnetic core plate, a second magnetic core plate and a magnetic core column, the first magnetic core plate and the second magnetic core plate are arranged opposite to the two side faces of the PCB respectively, and the magnetic core column is arranged on the first magnetic core plate and arranged in the through hole; and each transformer winding is arranged on at least one substrate, and the transformer windings are arranged around the magnetic core columns in the through holes. According to the transformer, the transformer winding is arranged on the PCB, so that the structure of the transformer is more compact, the current-carrying density is improved, the accommodating space required by the transformer is greatly reduced, and the requirements of high power and small size of the design of a power adapter are met.

Description

Technical Field

[0001] The utility model relates to the technical field of transformers, in particular to a transformer, a power supply mainboard and a power supply adapter. Background Art

[0002] With the development of household consumer electronic devices, small size, light weight and high power density are becoming more and more popular among consumers.

[0003] If the existing power adapter needs a higher output power, the transformer is required to have a stronger current-carrying capacity. The conventional transformer structure used in the existing high-power power adapter is large in size, and it is difficult to reduce the size while achieving high output power, which cannot meet the design requirements of the power adapter. Utility Model Content

[0004] The embodiments of the utility model provide a transformer, a power mainboard and a power adapter to solve the problem that the existing high-power transformer cannot meet the small-volume design requirement of the power adapter.

[0005] The utility model embodiment provides a transformer, including a PCB circuit board, a magnetic core assembly and at least two transformer windings;

[0006] The PCB circuit board is provided with a through hole, and the PCB circuit board comprises at least two layers of substrates;

[0007] The magnetic core assembly comprises a first magnetic core plate, a second magnetic core plate and a magnetic core column, wherein the first magnetic core plate and the second magnetic core plate are respectively arranged opposite to two side surfaces of the PCB circuit board, the magnetic core column is arranged on the first magnetic core plate, and the magnetic core column is arranged in the through hole;

[0008] Each transformer winding is arranged on at least one of the substrates, and the transformer winding is arranged around the magnetic core column in the through hole.

[0009] Preferably, the transformer winding comprises a printed winding and / or copper foil printed on the PCB circuit board.

[0010] Preferably, the transformer winding includes a main winding, a secondary winding, a feedback winding and a shielding winding; the PCB circuit board body includes a first substrate, a second substrate, a third substrate, a fourth substrate, a fifth substrate and a sixth substrate in sequence;

[0011] The main winding is arranged on the second substrate, the third substrate, the fourth substrate and the fifth substrate;

[0012] The secondary winding is arranged on the first substrate and the sixth substrate, and the secondary winding is coupled with the main winding;

[0013] The feedback winding is arranged on the second substrate and the fifth substrate, and the feedback winding is coupled with the main winding;

[0014] The shielding winding is arranged on the second substrate and the fifth substrate to play a signal shielding role.

[0015] Preferably, the secondary winding comprises a single-turn winding coil respectively arranged on the first substrate and the sixth substrate.

[0016] Preferably, the secondary windings arranged on different substrates are connected in parallel;

[0017] The main windings arranged on different substrates are connected in series.

[0018] Preferably, the first magnetic core plate is provided with an accommodating groove;

[0019] The magnetic core column is arranged in the accommodating groove;

[0020] The portion of the PCB circuit board where at least two transformer windings are arranged is disposed in the accommodating groove.

[0021] Preferably, an air gap is provided between the first magnetic core plate and the second magnetic core plate.

[0022] The embodiment of the utility model further provides a power supply mainboard, comprising the above-mentioned transformer;

[0023] The PCB circuit board is provided with a switching power supply circuit;

[0024] The transformer winding is electrically connected to the switching power supply circuit.

[0025] Preferably, the transformer winding comprises a main winding, a secondary winding, a feedback winding and a shielding winding;

[0026] The winding tap of the main winding is electrically connected to the input end filter circuit in the switching power supply circuit;

[0027] The winding tap of the secondary winding is electrically connected to the output-end rectifier and filter circuit in the switching power supply circuit;

[0028] The winding tap of the feedback winding is electrically connected to the power supply terminal of the primary IC in the switching power supply circuit.

[0029] The embodiment of the utility model further provides a power adapter, comprising the above-mentioned power mainboard.

[0030] The transformer, power supply mainboard and power supply adapter provided by the embodiments of the utility model adopt a PCB circuit board as the transformer skeleton and set the transformer winding on the PCB circuit board, so as to make the transformer structure more compact, improve the current carrying density, greatly reduce the accommodation space required for the transformer, and meet the high-power and small-volume requirements of the power supply adapter design. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments of the utility model will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 It is a structural schematic diagram of a transformer in one embodiment of the utility model.

[0033] In the figure: 1. PCB circuit board; 11. first substrate; 12. second substrate; 13. third substrate; 14. fourth substrate; 15. fifth substrate; 16. sixth substrate; 2. magnetic core; 21. first magnetic core plate; 22. second magnetic core plate; 23. magnetic core column; 3. transformer winding; 4. through hole. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] It should be understood that the utility model can be implemented in different forms and should not be construed as being limited to the embodiments presented herein. On the contrary, providing these embodiments will make the disclosure thorough and complete, and fully convey the scope of the utility model to those skilled in the art. In the accompanying drawings, the sizes and relative sizes of layers and regions may be exaggerated for clarity. The same reference numerals throughout represent the same elements.

[0036] It should be understood that when an element or layer is referred to as being "on, adjacent to, connected to or coupled to other elements or layers, it may be directly on, adjacent to, connected to or coupled to other elements or layers, or there may be intervening elements or layers. On the contrary, when an element is referred to as being "directly on, directly adjacent to, directly connected to or directly coupled to other elements or layers, there are no intervening elements or layers. It should be understood that although the terms first, second, third, etc. may be used to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the teachings of the present invention, the first element, component, region, layer or part discussed below may be represented as a second element, component, region, layer or part.

[0037] Spatially relative terms such as "under," "beneath," "below," "under," "above," "above," and the like may be used herein for ease of description to describe the relationship of an element or feature shown in the figures to other elements or features. It should be understood that the spatially relative terms are intended to include different orientations of the device in use and operation in addition to the orientations shown in the figures. For example, if the device in the accompanying drawings is flipped, then the elements or features described as "under other elements" or "under" or "under" will be oriented as "above" the other elements or features. Thus, the exemplary terms "under" and "under" may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or other orientations) and the spatial descriptors used herein are interpreted accordingly.

[0038] The purpose of the terms used herein is only to describe specific embodiments and is not intended to be a limitation of the present invention. When used herein, the singular forms "one", "an" and "said / the" are also intended to include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "consisting of" and / or "comprising" when used in this specification determine the presence of the features, integers, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups. When used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0039] In order to thoroughly understand the present invention, detailed structures and steps will be presented in the following description to illustrate the technical solution proposed by the present invention. The preferred embodiments of the present invention are described in detail below, but in addition to these detailed descriptions, the present invention may also have other implementations.

[0040] The utility model embodiment provides a transformer, including a PCB circuit board 1, a magnetic core component 2 and at least two transformer windings 3; a through hole 4 is opened on the PCB circuit board 1, and the PCB circuit board 1 includes at least two layers of substrates; the magnetic core component 2 includes a first magnetic core plate 21, a second magnetic core plate 22 and a magnetic core column 23, the first magnetic core plate 21 and the second magnetic core plate 22 are respectively arranged opposite to the two side surfaces of the PCB circuit board 1, the magnetic core column 23 is arranged on the first magnetic core plate 21, and the magnetic core column 23 is arranged in the through hole 4; each transformer winding 3 is arranged on at least one substrate, and the transformer winding 3 is arranged around the magnetic core component 2 in the through hole 4.

[0041] As an example, the transformer includes a transformer skeleton made of a PCB circuit board 1, a magnetic core assembly 2 and at least two transformer windings 3 arranged in the PCB circuit board 1. The magnetic core assembly 2 includes a first magnetic core plate 21, a second magnetic core plate 22 and a magnetic core column 23 arranged on the first magnetic core plate 21, the first magnetic core plate 21 and the second magnetic core plate 22 are respectively arranged on both sides of the PCB circuit board 1, and the part of the PCB circuit board 1 where the transformer winding 3 is arranged is sandwiched between the first magnetic core plate 21 and the second magnetic core plate 22. A through hole 4 is opened on the PCB circuit board 1, and the shape of the through hole 4 can be the same as the shape of the magnetic core column 23, and the magnetic core column 23 is penetrated in the through hole 4. The PCB circuit board 1 includes at least two layers of substrates, each transformer winding 3 is arranged on at least one layer of substrates, and the transformer winding 3 is arranged around the magnetic core assembly 2 in the through hole 4, and the transformer windings 3 arranged on different layers of substrates can be electrically connected through the pad vias on the substrate.

[0042] In this example, by using the PCB circuit board 1 as the transformer skeleton and setting the transformer winding 3 on the PCB circuit board 1, the transformer structure can be made more compact, the current carrying density can be improved, and the accommodating space required for the transformer can be greatly reduced.

[0043] In one embodiment, the transformer winding 3 includes a printed winding and / or copper foil printed on the PCB circuit board 1 .

[0044] As an example, the transformer winding 3 can be a spiral printed winding formed on different layers of substrates of the PCB circuit board 1 using a printed circuit board manufacturing process. When the transformer winding 3 is used as a main winding or a feedback winding, it can be a spiral printed winding to increase the number of winding turns. It can also be a copper foil set on different layers of substrates of the PCB circuit board 1. When the transformer winding 3 is used as a secondary winding, it can be a copper foil to improve the secondary current carrying capacity. Using a printed winding as the transformer winding 3 is conducive to setting a multi-turn coil, and using copper foil as the transformer winding 3 is conducive to improving the current carrying capacity.

[0045] In one embodiment, the transformer winding 3 includes a main winding, a secondary winding, a feedback winding and a shielding winding; the PCB circuit board 1 body includes a first substrate 11, a second substrate 12, a third substrate 13, a fourth substrate 14, a fifth substrate 15 and a sixth substrate 16 in sequence; the main winding is arranged on the second substrate 12, the third substrate 13, the fourth substrate 14 and the fifth substrate 15; the secondary winding is arranged on the first substrate 11 and the sixth substrate 16, and the secondary winding is coupled with the main winding; the feedback winding is arranged on the second substrate 12 and the fifth substrate 15, and the feedback winding is coupled with the main winding; the shielding winding is arranged on the second substrate 12 and the fifth substrate 15 to play a signal shielding role.

[0046] As an example, the transformer winding 3 may include a main winding, a secondary winding, a feedback winding and a shielding winding. The main winding is the primary winding of the transformer. When the transformer is used in a switching power supply circuit, the main winding can be connected to the output end of the input rectifier and filter circuit, and the secondary winding is coupled to the main winding. When the transformer is used in a switching power supply circuit, the secondary winding can be connected to the output rectifier and filter circuit, and the feedback winding is coupled to the main winding. When the transformer is used in a switching power supply circuit, the feedback winding can provide a power supply voltage for the primary IC.

[0047] like Figure 1 As shown, the PCB circuit board 1 body includes a first substrate 11, a second substrate 12, a third substrate 13, a fourth substrate 14, a fifth substrate 15 and a sixth substrate 16 from top to bottom. A multi-turn main winding coil can be arranged on the third substrate 13 and the fourth substrate 14, and a single-turn main winding coil, a feedback winding and a shielding winding are arranged on the second substrate 12 and the fifth substrate 15. The secondary winding is arranged on the first substrate 11 and the sixth substrate 16, and the secondary winding is coupled with the main winding. The shielding winding arranged on the second substrate 12 and the fifth substrate 15 can form a shielding effect between the secondary winding and the main winding. Arranging the shielding winding, the feedback winding and the single-turn main winding on the same substrate can minimize the number of substrate layers and further reduce the volume of the transformer.

[0048] In one embodiment, the secondary winding includes a single-turn winding coil disposed on the first substrate 11 and the sixth substrate 16 respectively.

[0049] As an example, by setting single-turn winding coils on the first substrate 11 and the sixth substrate 16 respectively, the number of turns of the secondary winding can be reduced as much as possible while ensuring the current carrying capacity, so that the number of turns of the main winding is also reduced as much as possible, which facilitates PCB wiring design.

[0050] In one embodiment, the secondary windings disposed on different substrates are connected in parallel; and the main windings disposed on different substrates are connected in series.

[0051] As an example, the two secondary windings arranged on the first substrate 11 and the sixth substrate 16 are connected head to head and tail to tail through the pad vias on each layer of the substrate to form a parallel connection. This arrangement can enhance the current carrying capacity of the secondary current and further reduce the skin effect during high-frequency operation. The four main windings arranged on the second substrate 12, the third substrate 13, the fourth substrate 14 and the fifth substrate 15 are connected head to tail through the pad vias on each layer of the substrate to form a series connection. This arrangement can increase the number of turns of the main winding and meet the PCB design requirements.

[0052] In one embodiment, a receiving groove is provided on the first magnetic core plate 21; the magnetic core column 23 is provided in the receiving groove; and a portion of the PCB circuit board 1 in which at least two transformer windings 3 are provided is arranged in the receiving groove.

[0053] As an example, Figure 1 As shown, a first magnetic core plate 21 is provided with an accommodating groove, a magnetic core column 23 is arranged in the accommodating groove, a part of the PCB circuit board 1 provided with the transformer winding 3 is arranged in the accommodating groove, the magnetic core column 23 is penetrated in the through hole 4, and the second magnetic core plate 22 covers the first magnetic core plate 21, so that one side of the PCB circuit board 1 is arranged opposite to the first magnetic core plate 21, and the other side of the PCB circuit board 1 is arranged opposite to the second magnetic core plate 22. This arrangement can obtain a better magnetic shielding effect and make the magnetic field distribution more uniform.

[0054] In one embodiment, an air gap is provided between the first magnetic core plate 21 and the second magnetic core plate 22 .

[0055] As an example, an air gap may be set between the magnetic core column 23 of the first magnetic core plate 21 and the second magnetic core plate 22 and at the overlapping portion of the second magnetic core plate 22 and the first magnetic core plate 21, or an air gap may be set only between the magnetic core column 23 of the first magnetic core plate 21 and the second magnetic core, or an air gap may be set only at the overlapping portion of the second magnetic core plate 22 and the first magnetic core plate 21.

[0056] The embodiment of the utility model further provides a power supply mainboard, comprising the transformer in the above embodiment; a switching power supply circuit is provided on a PCB circuit board 1; and a transformer winding 3 is electrically connected to the switching power supply circuit.

[0057] As an example, the power mainboard uses the PCB circuit board 1 in the transformer as a circuit board for carrying the switching power supply circuit, and the connection lines and components in the switching power supply circuit are arranged on the PCB circuit board 1, and the connection lines in the switching power supply circuit are electrically connected to the transformer winding 3. In this example, by using the PCB circuit board 1 as the transformer skeleton and arranging the transformer winding 3 on the PCB circuit board 1, the transformer structure can be made more compact, the current carrying density can be improved, and the accommodation space required for the transformer can be greatly reduced.

[0058] In one embodiment, the transformer winding 3 includes a main winding, a secondary winding, a feedback winding and a shielding winding; the winding tap of the main winding is electrically connected to the input filter circuit in the switching power supply circuit; the winding tap of the secondary winding is electrically connected to the output rectifier filter circuit in the switching power supply circuit; the winding tap of the feedback winding is electrically connected to the power supply end of the primary IC in the switching power supply circuit.

[0059] As an example, the transformer winding 3 includes a main winding, a secondary winding, a feedback winding and a shielding winding; the winding tap of the main winding is electrically connected to the input filter circuit in the switching power supply circuit, and the winding tap of the feedback winding is electrically connected to the power supply end of the primary IC in the switching power supply circuit. One winding tap of the secondary winding is electrically connected to the output rectifier filter circuit in the switching power supply circuit, and another winding tap of the secondary winding and the magnetic core component 2 of the transformer are connected to the secondary ground together. This setting can make the magnetic core component 2 of the transformer and the secondary winding belong to the secondary end, so that the secondary winding and the magnetic core component 2 of the transformer do not need to meet the safety distance requirements, further compressing the volume of the transformer.

[0060] The embodiment of the utility model further provides a power adapter, comprising the power mainboard in the above embodiment.

[0061] As an example, the power adapter includes the power mainboard in the above example. By adopting a PCB circuit board 1 as a transformer skeleton and setting the transformer winding 3 on the PCB circuit board 1, the transformer structure can be made more compact, the current carrying density can be improved, and the accommodation space required for the transformer can be greatly reduced, thereby meeting the high-power and small-volume requirements of the power adapter design.

[0062] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention.

Claims

1. A transformer, characterized in that: It includes a PCB circuit board, a magnetic core assembly and at least two transformer windings; The PCB circuit board is provided with a through hole, and the PCB circuit board comprises at least two layers of substrates; The magnetic core assembly comprises a first magnetic core plate, a second magnetic core plate and a magnetic core column, wherein the first magnetic core plate and the second magnetic core plate are respectively arranged opposite to two side surfaces of the PCB circuit board, the magnetic core column is arranged on the first magnetic core plate, and the magnetic core column is arranged in the through hole; Each transformer winding is arranged on at least one of the substrates, and the transformer winding is arranged around the magnetic core column in the through hole.

2. The transformer according to claim 1, characterized in that: The transformer winding includes a printed winding and / or copper foil printed on the PCB circuit board.

3. The transformer according to claim 2, characterized in that: The transformer winding includes a main winding, a secondary winding, a feedback winding and a shielding winding; the PCB circuit board body includes a first substrate, a second substrate, a third substrate, a fourth substrate, a fifth substrate and a sixth substrate in sequence; The main winding is arranged on the second substrate, the third substrate, the fourth substrate and the fifth substrate; The secondary winding is arranged on the first substrate and the sixth substrate, and the secondary winding is coupled with the main winding; The feedback winding is arranged on the second substrate and the fifth substrate, and the feedback winding is coupled with the main winding; The shielding winding is arranged on the second substrate and the fifth substrate to play a signal shielding role.

4. The transformer according to claim 3, characterized in that: The secondary winding includes a single-turn winding coil disposed on the first substrate and the sixth substrate, respectively.

5. The transformer according to claim 3, characterized in that: The secondary windings arranged on different substrates are connected in parallel; The main windings arranged on different substrates are connected in series.

6. The transformer according to claim 1, characterized in that: The first magnetic core plate is provided with an accommodating groove; The magnetic core column is arranged in the accommodating groove; The portion of the PCB circuit board where at least two transformer windings are arranged is disposed in the accommodating groove.

7. The transformer according to claim 6, characterized in that: An air gap is provided between the first magnetic core plate and the second magnetic core plate.

8. A power supply mainboard, characterized in that: A transformer comprising any one of claims 1 to 7; The PCB circuit board is provided with a switching power supply circuit; The transformer winding is electrically connected to the switching power supply circuit.

9. The power supply mainboard according to claim 8, characterized in that: The transformer winding includes a main winding, a secondary winding, a feedback winding and a shielding winding; The winding tap of the main winding is electrically connected to the input end filter circuit in the switching power supply circuit; The winding tap of the secondary winding is electrically connected to the output-end rectifier and filter circuit in the switching power supply circuit; The winding tap of the feedback winding is electrically connected to the power supply terminal of the primary IC in the switching power supply circuit.

10. A power adapter, characterized in that: Comprising the power supply mainboard as described in any one of claims 8-9.

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