A circuit board structure of a power adapter
Patent Information
- Application Number
- CN202522035447.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-22
- Publication Date
- 2026-08-18
- Estimated Expiration
- 2035-09-22
AI Technical Summary
[0004]但是，这样就会导致变压器散热不足，且变压器包裹工艺繁琐，甚至可能无法采用机器实现自动化，只能人工包裹
[0015]本实用新型提供的技术方案可以包括以下有益效果：通过纵向设置的副电路板缩小主电路板的面积，同时在副电路板靠近变压器的一面使用绝缘涂层塑封后，副电路板可用于变压器后面的绝缘分隔；另外，通过绝缘挡板围蔽变压器的前面、左面和右面，进一步增强了变压器与周围其他元器件的绝缘效果，同时利用绝缘挡板的高度延长了变压器初次级爬电距离（因安装在变压器的前面，即出线端或进线端），以保证符合安规要求（爬电距离至少大于 6mm）；从而，相较于传统用麦拉胶带或麦拉胶纸包裹变压器的方式，这种结构无需对变压器进行整体包裹，大大改善了变压器的散热条件，而且副电路板的安装和绝缘挡板的设置更易于实现机械化、自动化操作，简化了生产工艺，降低了人工成本。
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Figure CN224653713U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of power adapter technology, and in particular to a circuit board structure for a power adapter. Background Technology
[0002] In current power adapter structures, the shape of the circuit board may need to be adjusted according to the requirements of the casing. For example, if the product requires the power adapter casing to be designed in a cube shape, the circuit board needs to be modified into a square board to be installed inside the casing. This results in the transformer integrated on the circuit board being surrounded by various components, making it impossible to guarantee the insulation separation between the transformer and various components. Furthermore, the primary and secondary creepage distances of the transformer can easily be less than 4mm, which does not meet safety regulations.
[0003] Therefore, the current measure is to use Mylar tape or Mylar paper to completely wrap the surface of the transformer, and wrap it with at least two layers (the wrapping layer is relatively thick), in order to increase the creepage distance and achieve insulation separation from surrounding components.
[0004] However, this would lead to insufficient heat dissipation in the transformer, and the transformer wrapping process would be cumbersome, possibly even making it impossible to automate with machines, requiring manual wrapping. Utility Model Content
[0005] To address the aforementioned shortcomings, the purpose of this invention is to propose a circuit board structure for a power adapter that solves the problems of insulation separation and creepage distance, while also simplifying the circuit board manufacturing process.
[0006] To achieve this objective, the present invention adopts the following technical solution: A circuit board structure for a power adapter includes a main circuit board, a secondary circuit board, a transformer, and an insulating baffle; the transformer is mounted on the top surface of the main circuit board, the secondary circuit board is mounted longitudinally on the top surface of the main circuit board, the secondary circuit board is located behind the transformer, and the side of the secondary circuit board closest to the transformer is encapsulated with an insulating coating. The insulating baffle is installed in front of the transformer and encloses the front, left and right sides of the transformer.
[0007] Furthermore, the front output end of the transformer is provided with a forward-extending conductor, which is used to cooperate with the insulating baffle for nested installation.
[0008] Furthermore, the side of the conductor is provided with at least one limiting notch, and the insulating baffle is provided with a limiting recess corresponding to the limiting notch. The limiting recess fits onto the outer periphery of the conductor, and the edge of the limiting recess passes upward through the limiting notch and cooperates with the limiting notch to limit movement.
[0009] Furthermore, the insulating baffle extends in an L-shape from the left edge of the limiting recess along the side of the transformer, forming a first L-shaped baffle that encloses the front and right sides of the transformer; The insulating baffle extends in an L-shape from the right edge of the limiting recess along the side of the transformer, forming a second L-shaped baffle that encloses the front and left side of the transformer.
[0010] Furthermore, the edge of the first L-shaped baffle or the second L-shaped baffle extends to form a cover plate structure.
[0011] Furthermore, the insulating coating is bonded to the rearward protruding frame of the transformer.
[0012] Furthermore, the insulating coating encapsulates the entire sub-circuit board.
[0013] Furthermore, the insulating coating is made of AB adhesive.
[0014] Furthermore, the sub-circuit board is used to integrate the flyback circuit in the power adapter.
[0015] The technical solution provided by this utility model can include the following beneficial effects: the area of the main circuit board is reduced by the longitudinally arranged sub-circuit board, and after the sub-circuit board is encapsulated with an insulating coating on the side close to the transformer, the sub-circuit board can be used for insulation separation behind the transformer; in addition, by enclosing the front, left and right sides of the transformer with insulating baffles, the insulation effect between the transformer and other surrounding components is further enhanced, and the height of the insulating baffles extends the primary and secondary creepage distance of the transformer (because it is installed at the front of the transformer, i.e., the outgoing or incoming end), to ensure compliance with safety regulations (creep distance of at least 6mm); thus, compared with the traditional method of wrapping the transformer with Mylar tape or Mylar paper, this structure does not require the entire transformer to be wrapped, which greatly improves the heat dissipation conditions of the transformer, and the installation of the sub-circuit board and the setting of the insulating baffles are easier to achieve mechanized and automated operation, simplifying the production process and reducing labor costs. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the circuit board structure of a power adapter according to one embodiment of the present invention. Figure 1 .
[0017] Figure 2 Is it like this? Figure 1 The diagram shows a schematic of the circuit board structure of a power adapter. Figure 2 .
[0018] Among them: main circuit board 1, secondary circuit board 2, transformer 3, insulating baffle 4, wire component 31, limiting notch 32, limiting recess 41, first L-shaped baffle 42, second L-shaped baffle 43, cover plate structure 44, and skeleton 33. Detailed Implementation
[0019] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.
[0020] In the description of this utility model, it should be understood that the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. Furthermore, features defined with "first" and "second" may explicitly or implicitly include one or more of these features, used to distinguish and describe features, without any order or emphasis.
[0021] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.
[0022] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model according to the specific circumstances.
[0023] The following is combined Figures 1 to 2 This describes the circuit board structure of a power adapter according to an embodiment of the present invention.
[0024] A circuit board structure for a power adapter includes a main circuit board 1, a secondary circuit board 2, a transformer 3, and an insulating baffle 4; the transformer 3 is mounted on the top surface of the main circuit board 1, the secondary circuit board 2 is mounted longitudinally on the top surface of the main circuit board 1, the secondary circuit board 2 is located behind the transformer 3, and the side of the secondary circuit board 2 closest to the transformer 3 is encapsulated with an insulating coating. An insulating baffle 4 is installed in front of the transformer 3, and encloses the front, left and right sides of the transformer 3.
[0025] In a preferred embodiment of the circuit board structure of a power adapter, this utility model provides an example, such as... Figure 1 As shown, the area of the main circuit board 1 is reduced by the longitudinally arranged secondary circuit board 2. Furthermore, after the side of the secondary circuit board 2 closest to the transformer 3 is encapsulated with an insulating coating, the secondary circuit board 2 can be used for insulation separation behind the transformer 3. In addition, the front, left, and right sides of the transformer 3 are enclosed by the insulating baffle 4, further enhancing the insulation effect between the transformer and other surrounding components. Simultaneously, the height of the insulating baffle 4 extends the primary and secondary creepage distance of the transformer 3 (because it is installed at the front of the transformer 3, i.e., the output or input terminal), ensuring compliance with safety regulations (creep distance at least greater than 6mm). Therefore, compared to the traditional method of wrapping the transformer 3 with Mylar tape or Mylar paper, this structure eliminates the need for complete wrapping of the transformer 3, greatly improving its heat dissipation. Moreover, the installation of the secondary circuit board 2 and the setting of the insulating baffle 4 facilitate mechanized and automated operation, simplifying the production process and reducing labor costs.
[0026] Furthermore, the front output end of the transformer 3 is provided with a forward-extending conductor 31, which is used to cooperate with the insulating baffle 4 for nested installation.
[0027] Considering that the output end of transformer 3 is usually provided with an outward extending conductor 31 for purposes such as extending the creepage distance or ensuring the separation of output lines; therefore, in order to reduce the structural modification of transformer 3, in this embodiment, it is preferable to use the conductor 31 to install the insulating baffle 4 in a nested manner.
[0028] Furthermore, the side of the conductor 31 is provided with at least one limiting notch 32, and the insulating baffle 4 is provided with a limiting recess 41 corresponding to the limiting notch 32. The limiting recess 41 fits onto the outer periphery of the conductor 31, and the edge of the limiting recess 41 passes upward through the limiting notch 32 and cooperates with the limiting notch 32 to limit the movement.
[0029] In this embodiment, as Figure 2 As shown, the nested installation of the conductor 31 and the insulating baffle 4 is preferably achieved by the outer periphery of the conductor 31 and the limiting notch 41 fitting together. The edge of the limiting notch 41 and the limiting gap 32 fit together to limit the movement, thus ensuring a secure installation between the conductor 31 and the insulating baffle 4. In this way, during automated installation, after the conductor 31 and the insulating baffle 4 are nested together, the transformer 3 can be soldered to the main circuit board 1 normally, simplifying the installation process.
[0030] Furthermore, the insulating baffle 4 extends in an L-shape from the left edge of the limiting recess 41 along the side of the transformer 3, forming a first L-shaped baffle 42 that encloses the front and right sides of the transformer 3. The insulating baffle 4 extends in an L-shape from the right edge of the limiting recess 41 along the side of the transformer 3, forming a second L-shaped baffle 43 that encloses the front and left side of the transformer 3.
[0031] In this embodiment, the L-shaped baffle's structural design can better fit the shape of the transformer, forming a comprehensive enclosure on the front, left, and right sides of the transformer 3, blocking electrical interference between the transformer 3 and surrounding components to the greatest extent, and further ensuring insulation separation; at the same time, the fit between the L-shaped structure and the side of the transformer 3 also enhances the structural strength of the insulation baffle 4 itself, making it less prone to deformation.
[0032] It should be noted that the first L-shaped baffle 42 and the second L-shaped baffle 43 do not necessarily need to completely enclose the front, left and right sides of the transformer 3. Partial enclosure can also create gaps between the transformer 3 and the surrounding components, which also has a certain separation effect.
[0033] Furthermore, the edge of the first L-shaped baffle 42 or the second L-shaped baffle 43 extends to form a cover plate structure 44.
[0034] In this embodiment, the cover plate structure 44 can further extend the creepage distance and the enclosure effect, and can cover the surrounding components, thus providing a certain degree of protection for the surrounding components.
[0035] Furthermore, the insulating coating adheres to the rearward protruding skeleton 33 of the transformer 3.
[0036] In this embodiment, the insulating coating and the protruding frame 33 of the transformer 3 are bonded together. This ensures the structural stability of the sub-circuit board 2 and allows the insulating coating to connect the sub-circuit board 2 and the frame 33, forming an integrated heat dissipation path. By increasing the heat dissipation area (i.e., the insulating coating + frame 33), the heat dissipation efficiency of both the sub-circuit board 2 and the transformer 3 can be improved simultaneously.
[0037] Furthermore, an insulating coating is used to encapsulate the entire sub-circuit board 2.
[0038] In this embodiment, based on the vertical design of the sub-circuit board 2, it is easier to be adjacent to the surrounding components. By encapsulating the entire sub-circuit board 2, all the components on the sub-circuit board 2 can be wrapped in an insulating coating, achieving insulation separation from the surrounding components and avoiding electrical interference between the components on the sub-circuit board 2 and the surrounding components.
[0039] Furthermore, the insulating coating uses AB adhesive.
[0040] In this embodiment, AB glue has good insulation properties and can meet insulation requirements; at the same time, after curing, AB glue has strong adhesion and mechanical strength, which can firmly bond the sub-circuit board 2 to the transformer 3 frame and ensure the stability of the structure; in addition, AB glue is cheaper, which helps to reduce production costs.
[0041] Furthermore, the secondary circuit board 2 is used to integrate the flyback circuit in the power adapter.
[0042] In this embodiment, the core circuit layout of the power adapter is mainly concentrated in the flyback circuit, that is, the circuit from the safety circuit connected to the rectifier bridge to the input terminal of the transformer 3; the small-sized components of this part of the circuit are densely packed, and components such as MOSFETs have high heat dissipation requirements; therefore, it is preferable to arrange this part of the circuit vertically.
[0043] Other components and operations of the circuit board structure of a power adapter according to an embodiment of the present invention are known to those skilled in the art and will not be described in detail here.
[0044] In this specification, the terms "embodiment," "example," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0045] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.
Claims
1. A circuit board structure for a power adapter, characterized in that: It includes a main circuit board, a secondary circuit board, a transformer, and an insulating baffle; the transformer is mounted on the top surface of the main circuit board, the secondary circuit board is mounted longitudinally on the top surface of the main circuit board, the secondary circuit board is located behind the transformer, and the side of the secondary circuit board closest to the transformer is encapsulated with an insulating coating. The insulating baffle is installed in front of the transformer and encloses the front, left and right sides of the transformer.
2. The circuit board structure of a power adapter according to claim 1, characterized in that: The transformer has a forward-extending conductor at the front output end, which is used to cooperate with the insulating baffle for nested installation.
3. The circuit board structure of a power adapter according to claim 2, characterized in that: The conductor has at least one limiting notch on its side, and the insulating baffle has a limiting recess corresponding to the limiting notch. The limiting recess fits onto the outer periphery of the conductor, and the edge of the limiting recess passes upward through the limiting notch and cooperates with the limiting notch to limit movement.
4. The circuit board structure of a power adapter according to claim 3, characterized in that: The insulating baffle extends in an L-shape from the left edge of the limiting recess along the side of the transformer, forming a first L-shaped baffle that encloses the front and right sides of the transformer. The insulating baffle extends in an L-shape from the right edge of the limiting recess along the side of the transformer, forming a second L-shaped baffle that encloses the front and left side of the transformer.
5. The circuit board structure of a power adapter according to claim 4, characterized in that: The edge of the first L-shaped baffle or the second L-shaped baffle extends to form a cover plate structure.
6. The circuit board structure of a power adapter according to claim 1, characterized in that: The insulating coating is bonded to the rearward protruding frame of the transformer.
7. The circuit board structure of a power adapter according to claim 1, characterized in that: The insulating coating encapsulates the entire sub-circuit board.
8. The circuit board structure of a power adapter according to claim 1, characterized in that: The insulating coating is made of AB glue.
9. The circuit board structure of a power adapter according to claim 1, characterized in that: The secondary circuit board is used to integrate the flyback circuit in the power adapter.