A charger

Abstract

The present invention belongs to the technical field of charging, and specifically discloses a charger. The charger includes a housing, a first circuit board, a second circuit board and an insulating bracket. The first circuit board is electrically connected to the second circuit board, and the first circuit board and the second circuit board are arranged in parallel separately; the first circuit board includes high-voltage circuit components, and a plurality of high-voltage circuit components are arranged on the top surface of the first circuit board opposite to the second circuit board; the second circuit board includes a plurality of low-voltage circuit components, and a plurality of low-voltage circuit components are arranged on the second circuit board; a limiting structure is provided on the insulating bracket to insulate and isolate the plurality of high-voltage circuit components from the second circuit board. The charger designed in the above manner has reliable insulation and isolation treatment inside, relatively low assembly complexity, stable and reliable structure, and compact layout of circuit components. On the premise of ensuring the working performance and safety of the charger, the volume of the charger can be effectively reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of charging, and in particular to a charger. Background Art

[0002] With the continuous update of consumer electronic products, small-sized high-power-density chargers have become the future development trend. However, to achieve a small size, in addition to the continuous reduction of the size of electronic components and the application of high-frequency design of products, it is also necessary to make reasonable use of space and apply a new layout to optimize the overall design, ultimately achieving the purpose of reducing the product size.

[0003] In the design of conventional chargers, the internal charger circuit often adopts a single PCB design, that is, all circuit components are integrated on one PCB, and the PCB is encapsulated in the charger housing. Since the sizes of conventional circuit components are often determined, sufficient area must be reserved on the PCB for the circuit components and their pins. At the same time, in order to balance efficiency and heat dissipation, it is difficult for the size of the PCB to meet the goal of miniaturized design, and the space utilization rate in the charger housing is not high, resulting in a relatively large size of the charger product. To further reduce the size, in the prior art, improvements have also been considered for the structure of the above-mentioned conventional chargers, in order to further reduce the volume of the charger and improve the space utilization rate in the charger housing. A relatively common method in the prior art is to improve the implementation method of the internal circuit of the charger. Such existing chargers adopt a multi-PCB combined structure to replace the traditional single-PCB structure, thereby changing the implementation method of the internal circuit of the charger from the planar layout form implemented by a single PCB to the three-dimensional layout form implemented by a multi-PCB combination. In this way, the internal circuit structure of the charger is more compact, which helps to reduce the volume of the charger. However, the charger with a multi-PCB combined structure still has its own defects. Compared with the single-PCB structure, the isolation difficulty of circuit components between multiple PCBs becomes larger, the assembly complexity becomes larger, and the stability of the overall structure is difficult to guarantee. Especially when the number of PCBs is greater than two, these defects are more obvious. If the relative positions of multiple PCBs are not reasonably arranged, the optimal space utilization rate cannot be achieved either. Summary of the Invention

[0004] The purpose of the present invention is to provide a charger with a compact layout of circuit components, a small volume, and capable of reducing the space occupied by circuit components.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A charger, comprising a housing, and a first circuit board, a second circuit board and an insulating bracket disposed inside the housing, wherein:

[0007] The first circuit board is electrically connected to the second circuit board, and the first circuit board and the second circuit board are arranged in parallel separately;

[0008] The first circuit board includes a plurality of high-voltage circuit components extending perpendicularly to the plane where the second circuit board is located, and the plurality of high-voltage circuit components are arranged on the top surface of the first circuit board opposite to the second circuit board;

[0009] The second circuit board includes a plurality of low-voltage circuit components, and the plurality of low-voltage circuit components are arranged on the second circuit board;

[0010] The insulating bracket is provided with a limiting structure for accommodating the plurality of high-voltage circuit components, so that the plurality of high-voltage circuit components are insulated from the second circuit board.

[0011] Wherein, the limiting structure is in contact with the ends of at least one of the high-voltage circuit components.

[0012] Wherein, the high-voltage circuit components include a transformer, a plug-in electrolytic capacitor and a plug-in inductor; the low-voltage circuit components include a low-voltage plug-in capacitor, a USB Type-C interface and an on-board chip.

[0013] Wherein, the low-voltage plug-in capacitor and the USB Type-C interface are arranged on the bottom surface of the second circuit board opposite to the first circuit board;

[0014] The pins of the low-voltage plug-in capacitor are bent so that the axis of the low-voltage plug-in capacitor is parallel to the second circuit board.

[0015] Wherein, the insulating bracket is provided with a supporting part matching the external shape of the low-voltage plug-in capacitor.

[0016] Wherein, there are two low-voltage plug-in capacitors on the second circuit board; an insulating sleeve is arranged outside at least one of the low-voltage plug-in capacitors.

[0017] Wherein, the axes of the two low-voltage plug-in capacitors are perpendicular to each other.

[0018] Wherein, a notch is formed on the second circuit board; the low-voltage plug-in capacitor is placed in the notch; the insulating bracket extends towards the notch.

[0019] Wherein, the second circuit board further includes a patch safety capacitor and a patch optocoupler; the patch safety capacitor and the USB Type-C interface are arranged on the same surface of the second circuit board; the patch optocoupler and the on-board chip are arranged on the same surface of the second circuit board.

[0020] Among them, a through hole is formed in the insulating bracket, and a wire electrically connected to the low-voltage output end of the transformer passes through the through hole and is welded to the pad of the second circuit board.

[0021] Among them, the transformer and the plug-in electrolytic capacitor are flush with the edge of the first circuit board.

[0022] Among them, the first circuit board further includes a fuse tube arranged on the same surface of the first circuit board as the transformer, and the fuse tube is connected in series on the pin wire electrically connected to the transformer.

[0023] Among them, the first circuit board and the second circuit board are electrically connected by jump wires.

[0024] Among them, a limit hole is formed in the second circuit board, and a limit post extending from the insulating bracket extends into the limit hole and penetrates the second circuit board. The beneficial effects of the present invention are as follows: The present invention discloses a charger, which includes a housing, and a first circuit board, a second circuit board and an insulating bracket arranged inside the housing. The first circuit board is electrically connected to the second circuit board, and the first circuit board and the second circuit board are arranged in parallel separately; the first circuit board includes a plurality of high-voltage circuit elements vertically extending towards the plane where the second circuit board is located, and the plurality of high-voltage circuit elements are arranged on the top surface of the first circuit board opposite to the second circuit board; the second circuit board includes a plurality of low-voltage circuit elements, and the plurality of low-voltage circuit elements are arranged on the second circuit board; a limit structure for accommodating the plurality of high-voltage circuit elements is arranged on the insulating bracket, so that the plurality of high-voltage circuit elements are insulated and isolated from the second circuit board. The charger designed in the above manner has reliable insulation isolation treatment inside, low assembly complexity, stable and reliable structure, and compact layout of circuit components. On the premise of ensuring the working performance and safety of the charger, the volume of the charger can be effectively reduced. Description of the Drawings

[0025] Figure 1 is the first axonometric view of a charger of the present invention.

[0026] Figure 2 is the second axonometric view of a charger of the present invention.

[0027] Figure 3 is Figure 1 the exploded view of

[0028] Figure 4 is Figure 1 the axonometric view of the insulating bracket in

[0029] In the figure:

[0030] 1. First circuit board; 11. Transformer; 12. First plug-in electrolytic capacitor; 13. Second plug-in electrolytic capacitor; 14. Plug-in inductor; 15. Fuse tube;

[0031] 2. Second circuit board; 21. Low-voltage plug-in capacitor; 22. USB Type-C interface; 23. SMD safety capacitor; 24. SMD optocoupler; 25. Notch; 26. Second limiting hole;

[0032] 3. Insulating bracket; 32. Limiting wall; 33. Opening; 331. Cover plate; 34. Through hole; 35. Support; 37. First limiting post; 38. Second limiting post; 381. Second reinforcing rib; 4. Insulating sleeve; 5. Jumper wire. Detailed implementation mode

[0033] The present invention will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that for the convenience of description, only parts related to the present invention are shown in the drawings, rather than all structures.

[0034] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0035] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but are in contact through other features between them. Moreover, the first feature being "above", "above", and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "below", and "under" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicating that the first feature has a lower horizontal height than the second feature.

[0036] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "right", etc. are based on the orientation or positional relationships shown in the drawings. They are only for the convenience of description and simplifying the operations, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0037] Combined with Figures 1 to 4 As shown, this embodiment provides a charger, which includes a housing, and a first circuit board 1, a second circuit board 2, and an insulating bracket 3 disposed inside the housing. The housing is not shown. Those skilled in the art can understand that generally, the housing provides a cavity for accommodating the overall structure composed of the first circuit board 1, the second circuit board 2, and the insulating bracket 3. According to requirements, openings can be provided at corresponding positions on the housing. The openings are used to expose a part of the overall structure, such as the cable interface in the overall structure; the openings are also used to expose the connectors electrically connected to the overall structure, such as the mains plug welded to the overall structure.

[0038] Specifically, the first circuit board 1 in this embodiment is electrically connected to the second circuit board 2, and the first circuit board 1 and the second circuit board 2 are arranged separately and in parallel; preferably, the first circuit board 1 and the second circuit board 2 in this embodiment are respectively mounted on the upper and lower sides of the insulating bracket 3, thereby isolating the first circuit board 1 and the second circuit board 2 through the insulating bracket 3, so as to prevent the circuit elements on the first circuit board 1 and the second circuit board 2 from directly contacting each other or having an electrical contact with gas medium breakdown. Those skilled in the art can understand that compared with other arrangement methods, arranging the first circuit board 1 and the second circuit board 2 separately and in parallel can make better use of the space between the two to accommodate circuit elements.

[0039] More specifically, the first circuit board 1 in this embodiment includes a plurality of high-voltage circuit elements extending perpendicularly to the plane where the second circuit board 2 is located. The plurality of high-voltage circuit elements are arranged on the top surface of the first circuit board 1 opposite to the second circuit board 2; preferably, the high-voltage circuit elements include a transformer 11, a plug-in electrolytic capacitor, a plug-in inductor 14, and a fuse 15 arranged on the same surface of the first circuit board 1 as the transformer 11. The fuse 15 is connected in series on the pin wire electrically connected to the transformer.

[0040] Further preferably, the plug-in electrolytic capacitors plugged on the first circuit board 1 include a first plug-in electrolytic capacitor 12 and a second plug-in electrolytic capacitor 13, and both the first plug-in electrolytic capacitor 12 and the second plug-in electrolytic capacitor 13 are arranged on the edge of the first circuit board 1. The plug-in inductor 14 and the fuse tube 15 are arranged side by side between the first plug-in electrolytic capacitor 12 and the second plug-in electrolytic capacitor 13. As a preference, the first plug-in electrolytic capacitor 12, the second plug-in electrolytic capacitor 13 and the transformer 11 are all flush with the edge of the first circuit board 1. According to the external dimensions of the first plug-in electrolytic capacitor 12, the second plug-in electrolytic capacitor 13, the transformer 11 and the plug-in inductor 14, the implementer of this embodiment can reasonably arrange the distribution positions of the above circuit components on the edge of the first circuit board 1 in combination with the component layout area provided by the first circuit board 1.

[0041] More specifically, the second circuit board 2 in this embodiment includes a plurality of low-voltage circuit components, and the plurality of low-voltage circuit components are arranged on the second circuit board 2. As a preference, the low-voltage circuit components include a low-voltage plug-in capacitor 21, a USB Type-C interface 22 and an on-board chip (not shown in the figure). Further preferably, the low-voltage plug-in capacitor 21 and the USB Type-C interface 22 are arranged on the bottom surface of the second circuit board 2 opposite to the first circuit board 1. Considering making full use of the two surfaces of the second circuit board 2, the on-board chip can be arranged on the top surface of the second circuit board 2 on the back of the USB Type-C interface 22.

[0042] Furthermore, the second circuit board 2 in this embodiment further includes a surface-mounted optocoupler 24 on the upper surface of the second circuit board 2, and a surface-mounted safety capacitor 23 arranged on the lower surface of the second circuit board 2. The selected surface-mounted safety capacitor 23 and surface-mounted optocoupler 24 are surface-mounted circuit components with a relatively low height. Compared with plug-in safety capacitors or other types of optocouplers, they can be more closely attached to the surface of the second circuit board 2 to reduce the space required for the circuit components on the second circuit board 2 to extend outwards. Further, the second circuit board 2 further includes a plug-in thermistor (not marked in the figure) arranged on the same surface as the low-voltage plug-in capacitor 21 on the second circuit board 2.

[0043] As a further preference, the above-mentioned first circuit board 1 and the second circuit board 2 are electrically connected by a flying wire 5. The flying wire 5 in this embodiment is convenient for bending and shaping, and is convenient for wiring, thus facilitating the assembly of the charger. The flying wire 5 in this embodiment can also be equivalently replaced by an electrical connection device such as a pin.

[0044] Further, in this embodiment, in order to make the circuit components arranged on the above-mentioned first circuit board 1 and second circuit board 2 more compact and achieve a better isolation effect, preferably, this embodiment provides a limiting structure on the insulating bracket 3 for accommodating a plurality of high-voltage circuit components, so that the plurality of high-voltage circuit components are insulated from the second circuit board 2. The limiting structure may include relatively separated structures such as a plurality of limiting grooves and limiting pits. The contour shape of the limiting groove or limiting pit can be determined according to the outer shape of the corresponding high-voltage circuit component to achieve the adaptation of the limiting structure to the high-voltage circuit component. Due to the existence of the limiting structure, it can play a role in indicating and aligning the installation position to a certain extent, and the assembly difficulty of the charger provided in this embodiment is correspondingly reduced.

[0045] Specifically, the limiting structure is attached to the outer surface of at least one high-voltage circuit component. Optionally, in this embodiment, the above-mentioned first plug-in electrolytic capacitor 12 located at a corner of the first circuit board 1 is attached to the lower bottom surface of the insulating bracket 3, or / and the transformer 11 arranged at the edge of the first circuit board 1 is attached to the insulating bracket 3.

[0046] More specifically, on one side of the insulating bracket 3 opposite to the above-mentioned transformer 11, a limiting groove is provided and extends downward along the direction perpendicular to the plane where the first circuit board 1 is located. The transformer 11 is accommodated in the limiting groove. Thus, through the arrangement of the limiting wall 32 in the limiting groove, when the insulating bracket 3 cooperates with the transformer 11, it has a certain guiding effect, which is convenient for the insulating bracket 3 to be accurately covered above the transformer 11. At the same time, it can also effectively avoid damaging the transformer 11 when assembling with the housing, and then play a certain protective role for the transformer 11.

[0047] In addition, for wiring and facilitating the heat dissipation of the transformer 11, the opposite sides of the above-mentioned limiting groove are open. A through hole 34 is provided at one of the outermost openings of the insulating bracket 3. The wire electrically connected to the low-voltage output end of the transformer 11 passes through the through hole 34 and is welded to the pad of the second circuit board 2.

[0048] Further, an opening 33 is provided at a corner of the above-mentioned insulating bracket 3. The opening 33 cooperates with the first plug-in electrolytic capacitor 12 located at a corner of the first circuit board 1. In order to fully isolate the first plug-in electrolytic capacitor 12 from the plurality of low-voltage circuit components on the second circuit board 2, preferably, the adjacent side walls of the opening 33 are both vertically extended upward away from the first circuit board 1, and a cover plate 331 is provided at the top of the extended wall. The cover plate 331 and the extended wall can be integrally formed and enclose a limiting structure for accommodating the first plug-in electrolytic capacitor 12. The cover plate 331 is attached to the top surface of the first plug-in electrolytic capacitor 12, so that the layout of the circuit components is more compact and the structure is more stable.

[0049] More specifically, in this embodiment, in order to further make the layout of the above-mentioned circuit elements more compact, preferably, a notch 25 is provided on the second circuit board 2. One purpose of setting this notch 25 is to place the low-voltage plug-in capacitor in the notch 25, which can facilitate the installation of the low-voltage plug-in capacitor and reduce the space occupied in the vertical direction. Preferably, the pins of the low-voltage plug-in capacitor are bent so that the axis of the low-voltage plug-in capacitor is parallel to the second circuit board 2.

[0050] Further, in this notch 25, two low-voltage plug-in capacitors 21 are provided. The axes of the two low-voltage plug-in capacitors 21 are perpendicular to each other and are respectively parallel to the second circuit board 2. In order to further improve the safety of the low-voltage plug-in capacitor, at least one of the two low-voltage plug-in capacitors 21 is sleeved with an insulating sleeve. For example, in this embodiment, a low-voltage plug-in capacitor provided at the edge of the second circuit board 2 is sleeved with an insulating sleeve 4. Considering that the high-voltage circuit elements on the first circuit board 1 extend vertically towards the plane where the second circuit board 2 is located, another purpose of setting the notch 25 is that due to the existence of the notch 25, a space for accommodating the ends of one or more high-voltage circuit elements is reserved on the plane where the second circuit board 2 is located, so that the distance between the first circuit board 1 and the second circuit board 2 is reduced, thereby further reducing the size of the charger. Typically, in this embodiment, the length of the first plug-in electrolytic capacitor 12 is significantly greater than that of other high-voltage circuit elements on the first circuit board 1. The end of the first plug-in electrolytic capacitor 12 is placed in the notch 25. Correspondingly, the limiting structure on the insulating bracket 3 that matches the end of the first plug-in electrolytic capacitor 12 is also placed in the notch 25, such as the limiting structure formed by the cover plate 331 and the extending wall, that is, the insulating bracket 3 extends towards the notch 25.

[0051] Furthermore, in this embodiment, in order to further improve the structural stability after the cooperation between the second circuit board 2 and the insulating bracket 3, preferably, a supporting portion is provided at the relative position of the insulating bracket and the above-mentioned low-voltage plug-in capacitor 21. The supporting portion matches the external shape of the low-voltage plug-in capacitor 21. More preferably, the supporting portion is set as a support 35 provided with an arc-shaped groove, and the arc-shaped groove is engaged with the outer peripheral surface of the low-voltage plug-in capacitor 21, so that the above-mentioned low-voltage plug-in capacitor 21 is more stably positioned.

[0052] In addition, in order to further improve the stability after the cooperation between the second circuit board 2 and the insulating bracket 3, in this embodiment, a positioning wall extends vertically upward in a direction away from the first circuit board 1 at a position opposite to one edge of the above-mentioned notch 25 on the insulating bracket 3. Preferably, the positioning wall is inserted into the notch 25 along one edge of the notch 25.

[0053] In addition, a first limiting post 37 and a first reinforcing rib are provided on the side of the positioning wall away from the notch 25. The first limiting post 37 cooperates with the first limiting hole on the second circuit board 2, and the second circuit board 2 is supported by the first reinforcing rib. In addition, a plurality of second limiting posts 38 are provided on the edge of the insulating bracket on the side away from the above-mentioned positioning wall. The root of each second limiting post 38 is also provided with a second reinforcing rib 381 having the same height as the above-mentioned first reinforcing rib. The second limiting hole 26 on the second circuit board 2 after installation cooperates with the second limiting post 38, and the second circuit board 2 is supported by the second reinforcing rib 381.

[0054] With the above structural design, the second circuit board 2 after installation can be stably and reliably connected to the insulating bracket 3. Moreover, through the arrangement of the first reinforcing rib and the second reinforcing rib 381 with the same height, the second circuit board 2 is arranged parallel and spaced from the upper surface of the insulating bracket 3, leaving a fixed installation space for the components on the lower bottom surface of the second circuit board 2. Moreover, it can also prevent the components on the lower bottom surface of the second circuit board 2 from being deformed or damaged when the second circuit board 2 is squeezed.

[0055] For the charger with the above structural design, through the arrangement of the insulating bracket 3, not only can the high-voltage circuit components on the first circuit board 1 be isolated from the low-voltage circuit components on the second circuit board 2, but also the structures of the first circuit board 1 and the second circuit board 2 after assembly can be made more stable, and the layout of the circuit components can be made more compact, thereby reducing the volume of the charger.

[0056] Note that the above is only the preferred embodiment of the present invention and the applied technical principles. Those skilled in the art will understand that the present invention is not limited to the specific embodiments here. Various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments only. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A charger, which includes a housing, and a first circuit board (1), a second circuit board (2) and an insulating bracket (3) arranged inside the housing, wherein: The first circuit board (1) is electrically connected to the second circuit board (2), and the first circuit board (1) and the second circuit board (2) are arranged in parallel separately; The first circuit board (1) includes a plurality of high-voltage circuit components extending perpendicularly to the plane where the second circuit board (2) is located, and the plurality of high-voltage circuit components are arranged on the top surface of the first circuit board (1) opposite to the second circuit board (2); The second circuit board (2) includes a plurality of low-voltage circuit components, and the plurality of low-voltage circuit components are arranged on the second circuit board (2); A limiting structure for accommodating the plurality of high-voltage circuit components is arranged on the insulating bracket (3), so that the plurality of high-voltage circuit components are insulated and isolated from the second circuit board (2); The high-voltage circuit components include a transformer (11), a plug-in electrolytic capacitor and a plug-in inductor (14); The low-voltage circuit components include a low-voltage plug-in capacitor (21), a USB Type-C interface (22) and an on-board chip.

2. The charger according to claim 1, wherein: The limiting structure fits with the ends of at least one of the high-voltage circuit components.

3. The charger according to claim 1, wherein: The low-voltage plug-in capacitor (21) and the USB Type-C interface (22) are arranged on the bottom surface of the second circuit board (2) opposite to the first circuit board (1); The pins of the low-voltage plug-in capacitor (21) are bent so that the axis of the low-voltage plug-in capacitor (21) is parallel to the second circuit board (2).

4. The charger according to claim 3, wherein: A support portion matching the external shape of the low-voltage plug-in capacitor (21) is arranged on the insulating bracket (3).

5. The charger according to claim 3, wherein: There are two low-voltage plug-in capacitors (21) on the second circuit board (2); An insulating sleeve (4) is arranged outside at least one of the low-voltage plug-in capacitors (21).

6. The charger according to claim 5, wherein: The axes of the two low-voltage plug-in capacitors (21) are perpendicular to each other.

7. The charger according to claim 3, wherein: A notch (25) is formed on the second circuit board (2); The low-voltage plug-in capacitor (21) is placed in the notch (25); The insulating bracket (3) extends towards the notch (25).

8. The charger according to claim 1, wherein: The second circuit board (2) further includes a surface-mounted safety capacitor (23) and a surface-mounted optocoupler (24); The surface-mounted safety capacitor (23) and the USB Type-C interface (22) are arranged on the same surface of the second circuit board (2); The surface-mounted optocoupler (24) and the on-board chip are arranged on the same surface of the second circuit board (2).

9. The charger according to claim 1, wherein: A through hole (34) is formed in the insulating bracket (3), and a wire electrically connected to the low-voltage output end of the transformer (11) passes through the through hole (34) and is welded to the pad of the second circuit board (2).

10. The charger according to claim 1, wherein: The transformer (11) and the plug-in electrolytic capacitor are flush with the edge of the first circuit board (1).

11. The charger according to claim 1, wherein: The first circuit board (1) further includes a fuse tube (15) arranged on the same surface as the transformer (11) on the first circuit board (1), and the fuse tube (15) is connected in series on the pin wire electrically connected to the transformer (11).

12. The charger according to claim 1, wherein: The first circuit board (1) and the second circuit board (2) are electrically connected through a jumper wire (5).

13. The charger according to claim 1, wherein: A limit hole is formed in the second circuit board (2), and a limit post extending from the insulating bracket (3) extends into the limit hole and penetrates through the second circuit board (2).

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