Power adapter

Abstract

The utility model relates to the technical field of power conversion devices, in particular to a power adapter which comprises a high-voltage input end, a low-voltage output end, a first circuit board, a second circuit board, a first capacitor, a transformer and an insulation structure. One end of the first circuit board is electrically connected with the high-voltage input end, the other end is electrically connected with the low-voltage output end, and the second circuit board is connected with the first circuit board; the first capacitor is electrically connected to the first circuit board; the transformer comprises a magnetic core; the insulating structure comprises an insulating plate, and the first capacitor is arranged in a first space formed by the first side surrounding part and the first surface; the magnetic core is arranged in a second space formed by the second side surrounding part and the second surface; the structure can be simplified, high power density is achieved, and the insulating plate and the first side surrounding part are used for achieving electrical isolation of the first capacitor, the first low-voltage area and the second low-voltage area; and the insulating plate and the second side surrounding part are used for realizing electrical isolation between the magnetic core and the first high-voltage area and the second high-voltage area or between the first low-voltage area and the second low-voltage area.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of power conversion devices, in particular to a power adapter. BACKGROUND

[0002] The power adapter inputs high-voltage commercial power and outputs low-voltage power, so the power adapter needs to enhance insulation between the primary high-voltage circuit and the secondary low-voltage circuit to ensure safety. The power adapter includes a transformer, an electrolytic capacitor, and a main circuit board, the transformer and the electrolytic capacitor are connected with the main circuit board, the magnetic core of the transformer can belong to the primary circuit or the secondary circuit, if the magnetic core belongs to the primary circuit, it needs to have sufficient insulation distance with the secondary circuit to meet the regulatory requirements, and vice versa.

[0003] The size of the electrolytic capacitor almost occupies the entire internal space of the power adapter, in the related technology, an independent insulation sleeve is used to wrap the electrolytic capacitor to make regulatory insulation with the secondary circuit. However, the insulation sleeve cannot meet the insulation between the magnetic core and the high-voltage area or the low-voltage area, and additional insulation sheets are needed, which occupies a lot of space in the casing, resulting in a high power density. CONTENT OF THE UTILITY MODEL

[0004] The purpose of the present disclosure is to provide a power adapter to meet the insulation requirements between the components in the high-voltage area and the components in the low-voltage area, and between the components in the low-voltage area and the components in the high-voltage area, on the basis of simplifying the structure.

[0005] To achieve the above purpose, the present disclosure provides a power adapter, comprising:

[0006] A high-voltage input end and a low-voltage output end, the high-voltage input end and the low-voltage output end are arranged opposite to each other along a first direction;

[0007] A first circuit board and a second circuit board, the first circuit board extends along the first direction; one end of the first circuit board is electrically connected with the high-voltage input end, and the other end is electrically connected with the low-voltage output end, the second circuit board is connected with the first circuit board; along the first direction, the first circuit board includes a first high-voltage area and a first low-voltage area, the second circuit board includes a second high-voltage area and a second low-voltage area, the first high-voltage area and the second high-voltage area are arranged close to the high-voltage input end, and the first low-voltage area and the second low-voltage area are arranged close to the low-voltage output end;

[0008] A first capacitor electrically connected to the first circuit board, a projection part of the first capacitor on the first circuit board is located in the first low-voltage area;

[0009] A transformer electrically connected to the second circuit board, the transformer includes a magnetic core; and

[0010] An insulation structure, comprising an insulation plate having opposite first and second surfaces, the first surface being provided with a first side wall forming a first space in cooperation with the first surface, and the second surface being provided with a second side wall forming a second space in cooperation with the second surface;

[0011] The first capacitor is disposed in the first space, and the insulation plate and the first side wall are used to achieve electrical isolation of the first capacitor from the first and second low-voltage areas.

[0012] The magnetic core is disposed in the second space, and the insulation plate and the second side wall are used to achieve electrical isolation of the magnetic core from the first and second high-voltage areas, or the insulation plate and the second side wall are used to achieve electrical isolation of the magnetic core from the first and second low-voltage areas.

[0013] In one embodiment, the insulation plate and the second side wall are used to achieve electrical isolation of the magnetic core from the first and second high-voltage areas.

[0014] The second side wall includes a first side plate, a second side plate, and a third side plate, the first and second side plates being oppositely arranged in a second direction and respectively covering two opposite surfaces of the magnetic core along the second direction, and the third side plate covering a surface of the magnetic core close to the second high-voltage area.

[0015] The third side plate is provided with a recess to avoid the second circuit board.

[0016] The second direction is perpendicular to the first direction.

[0017] In one embodiment, the power adapter further includes a first high-voltage element mounted in the first high-voltage area.

[0018] The insulation structure further includes a tongue connected to the third side plate and extending towards the second high-voltage area along the surface of the second circuit board, the tongue being located between the first high-voltage element and the second circuit board and used to achieve electrical isolation of the magnetic core from the first high-voltage element.

[0019] In one embodiment, the power adapter further includes a first high-voltage element mounted in the first high-voltage area.

[0020] The insulation structure further comprises a third plate part connected with the third side plate and extending towards the second high-voltage area along the surface of the second circuit board, the third plate part being located between the first high-voltage element and the second circuit board; a projection of the first high-voltage element in a plane in which the third plate part is located is located in the third plate part; and a metal powder layer is arranged on a side of the third plate part facing the first high-voltage element.

[0021] In one embodiment, the insulation structure further comprises a fourth plate part and a fifth plate part, the fifth plate part extending from the third side plate towards a side close to the first capacitor, and the fourth plate part being connected to the third plate part and an end of the fifth plate part away from the first circuit board; the first high-voltage element is located in a third space enclosed by the third plate part, the fourth plate part and the fifth plate part; and a metal powder layer is arranged on a side of the fourth plate part and the fifth plate part facing the first high-voltage element.

[0022] In one embodiment, the first high-voltage element is a filter module.

[0023] In one embodiment, the insulation plate and the second side enclosing part are used to achieve electrical isolation of the magnetic core from the first low-voltage area and the second low-voltage area.

[0024] The second side enclosing part comprises a first side plate, a second side plate and a third side plate, the first side plate and the second side plate are oppositely arranged in a second direction, and respectively cover two opposite surfaces of the magnetic core along the second direction, and the third side plate covers a surface of the magnetic core close to the second low-voltage area.

[0025] The third side plate is provided with a recess to avoid the second circuit board.

[0026] The second direction is perpendicular to the first direction.

[0027] In one embodiment, a pin of the first capacitor is electrically connected to the first high-voltage area, and a main body of the first capacitor extends towards the first low-voltage area along the first direction.

[0028] The first side enclosing part comprises a first plate part and a second plate part, the first plate part is used to achieve electrical isolation of an axial end surface of the first capacitor close to the low-voltage output end from the first low-voltage area and a low-voltage area of the second circuit board; and the second plate part is used to achieve electrical isolation of a circumferential side surface of the first capacitor from the first low-voltage area and the second low-voltage area.

[0029] In one embodiment, the first plate portion is perpendicular to the first circuit board and the second circuit board at the same time, wherein the first circuit board and the second circuit board are perpendicular to each other.

[0030] In one embodiment, the second plate portion comprises a straight plate and an arc plate, the straight plate is connected to the insulating plate perpendicularly, and the arc plate is connected to the straight plate and is matched with the circumferential side of the first capacitor.

[0031] In one embodiment, the arc plate is provided with a avoiding gap on the side close to the first high-voltage area for avoiding the pin of the first capacitor.

[0032] In one embodiment, the insulating structure is an integrally formed structure.

[0033] In one embodiment, the insulating structure comprises a plurality of stacked insulating layers.

[0034] The beneficial effects of the present disclosure mainly lie in:

[0035] The power adapter provided by the present disclosure can simplify the internal structure of the power adapter by setting the insulating structure, and realize a high power density. Meanwhile, the first capacitor is placed in the first space, and the insulating plate and the first side wall portion are used to realize the electrical isolation of the first capacitor from the first low-voltage area and the second low-voltage area. The magnetic core is placed in the second space, and when the magnetic core belongs to the second low-voltage area, the insulating plate and the second side wall portion are used to realize the electrical isolation of the magnetic core from the first high-voltage area and the second high-voltage area, and when the magnetic core belongs to the second high-voltage area, the insulating plate and the second side wall portion are used to realize the electrical isolation of the magnetic core from the first low-voltage area and the second low-voltage area. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the specific embodiments of the present disclosure or the technical solutions in the prior art, the drawings needed in the specific embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present disclosure, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0037] Figure 1 The internal structure schematic diagram of the power adapter provided by the embodiment of the present disclosure;

[0038] Figure 2 The internal structure schematic diagram of the power adapter provided by the embodiment of the present disclosure from another perspective;

[0039] Figure 3 The side view of the power adapter provided by the embodiment of the present disclosure Figure 1 ;

[0040] Figure 4 Side view of the power adapter provided by the embodiment of the present disclosure Figure 2

[0041] Figure 5 Side view of the power adapter provided by the embodiment of the present disclosure Figure 3

[0042] Figure 6 Internal structure schematic diagram of the power adapter provided by the embodiment of the present disclosure from another perspective;

[0043] Figure 7 Structure schematic diagram of the insulation structure in the power adapter provided by the embodiment of the present disclosure;

[0044] Figure 8 Structure schematic diagram of the insulation structure in the power adapter provided by the embodiment of the present disclosure from another perspective;

[0045] Figure 9 Another structure schematic diagram of the power adapter provided by the embodiment of the present disclosure;

[0046] Figure 10 The third structure schematic diagram of the power adapter provided by the embodiment of the present disclosure.

[0047] The following is the explanation of the reference signs:

[0048] 10 - high voltage input end;

[0049] 20 - low voltage output end;

[0050] 30 - first circuit board;

[0051] 31 - first high voltage area;

[0052] 32 - first low voltage area;

[0053] 33 - optical coupling module;

[0054] 40 - second circuit board;

[0055] 41 - second high voltage area;

[0056] 42 - second low voltage area;

[0057] 50 - first capacitor;

[0058] 51 - main body;

[0059] 52 - pin;

[0060] 60 - magnetic core;

[0061] 70 - insulation structure;

[0062] 71 - insulation plate;​​

[0063] 711 - first surface;

[0064] 712 - second surface;

[0065] 72 - first side wall portion;

[0066] 721 - first plate portion;

[0067] 722 - second plate portion;

[0068] 722a - avoidance gap;

[0069] 7221 - straight plate;

[0070] 7222 - curved plate;

[0071] 73 - second side wall portion;

[0072] 731 - first side plate;

[0073] 732 - second side plate;

[0074] 733 - third side plate;

[0075] 733a - avoidance groove;

[0076] 74 - tongue;

[0077] 75 - third plate portion;

[0078] 76 - fourth plate portion;

[0079] 77 - fifth plate portion;

[0080] 80 - first high-voltage element. DETAILED DESCRIPTION

[0081] The technical solutions of the present disclosure will be described clearly and completely below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present disclosure.

[0082] In the description of the present disclosure, it should be explained that, as the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like appear, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present disclosure and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present disclosure. In addition, as the terms "first", "second", "third" appear, they are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0083] In the description of the present disclosure, it should be explained that, unless otherwise explicitly specified and limited, as the terms "mounting", "connecting", "connecting" appear, they should be understood in a broad sense, for example, they can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present disclosure can be understood according to the specific circumstances.

[0084] Referring to Figures 1 to 10 As shown, the embodiment provides a power adapter, which comprises a high-voltage input end 10, a low-voltage output end 20, a first circuit board 30, a second circuit board 40, a first capacitor 50, a transformer and an insulation structure 70. The high-voltage input end 10 and the low-voltage output end 20 are oppositely arranged along a first direction (represented by an arrow direction D1). The first circuit board 30 extends along the first direction. One end of the first circuit board 30 is electrically connected with the high-voltage input end 10, and the other end is electrically connected with the low-voltage output end 20. The second circuit board 40 is connected with the first circuit board 30. Along the first direction, the first circuit board 30 comprises a first high-voltage area 31 and a first low-voltage area 32, and the second circuit board 40 comprises a second high-voltage area 41 and a second low-voltage area 42. The first high-voltage area 31 and the second high-voltage area 41 are arranged close to the high-voltage input end 10, and the first low-voltage area 32 and the second low-voltage area 42 are arranged close to the low-voltage output end 20. Specifically, referring to Figure 3 and Figure 4 As shown, Figure 3 The dashed box in the figure represents the second high-voltage area 41, and the dotted box represents the second low-voltage area 42. Figure 4 The dashed box in the figure represents the first high-voltage area 31, and the dotted box represents the first low-voltage area 32.

[0085] The first capacitor 50 is electrically connected to the first circuit board 30, and a projection of the first capacitor 50 on the first circuit board 30 is located in the first low-voltage area 32; the transformer is electrically connected to the second circuit board 40, and the transformer includes a magnetic core 60; the insulation structure 70 includes an insulation plate 71, the insulation plate 71 has opposite first and second surfaces 711 and 712, the first surface 711 is provided with a first side wall 72, and the first side wall 72 cooperates with the first surface 711 to form a first space; the second surface 712 is provided with a second side wall 73, and the second side wall 73 cooperates with the second surface 712 to form a second space; wherein the first capacitor 50 is placed in the first space, the insulation plate 71 and the first side wall 72 are used to realize electrical isolation of the first capacitor 50 from the first low-voltage area 32 and the second low-voltage area 42; the magnetic core 60 is placed in the second space; the insulation plate 71 and the second side wall 73 are used to realize electrical isolation of the magnetic core 60 from the first high-voltage area 31 and the second high-voltage area 41, or the insulation plate 71 and the second side wall 73 are used to realize electrical isolation of the magnetic core 60 from the first low-voltage area 32 and the second low-voltage area 42.

[0086] The power adapter provided by the embodiment can simplify the internal structure of the power adapter and realize a high power density by arranging the insulation structure 70; meanwhile, the first capacitor 50 is placed in the first space, the insulation plate 71 and the first side wall 72 are used to realize electrical isolation of the first capacitor 50 from the first low-voltage area 32 and the second low-voltage area 42; the magnetic core 60 is placed in the second space, when the magnetic core 60 belongs to the second low-voltage area 42, the insulation plate 71 and the second side wall 73 are used to realize electrical isolation of the magnetic core 60 from the first high-voltage area 31 and the second high-voltage area 41, and when the magnetic core 60 belongs to the second high-voltage area 41, the insulation plate 71 and the second side wall 73 are used to realize electrical isolation of the magnetic core 60 from the first low-voltage area 32 and the second low-voltage area 42.

[0087] For example, the high-voltage input end 10 can be a plug, and the low-voltage output end 20 can be a Type-C interface.

[0088] It should be understood that the electrical isolation refers to increasing the safety distance, that is, the electrical isolation of the first capacitor 50 from the first low-voltage area 32 and the second low-voltage area 42 is realized by increasing the safety distance between the first capacitor 50 and the first low-voltage area 32 and the second low-voltage area 42.

[0089] When the magnetic core 60 is located in the first low-voltage area, the insulation plate 71 and the second side wall 73 can increase the creepage distance between the magnetic core 60 and the first high-voltage area 31 and the second high-voltage area 41, thereby realizing the electrical isolation of the magnetic core 60 and the first high-voltage area 31 and the second high-voltage area 41; when the magnetic core 60 belongs to the second high-voltage area, the insulation plate 71 and the second side wall 73 can increase the creepage distance between the magnetic core 60 and the first low-voltage area 32 and the second low-voltage area 42, thereby realizing the electrical isolation of the magnetic core 60 and the first low-voltage area 32 and the second low-voltage area 42.

[0090] For example, the second circuit board 40 is perpendicular to the board surface of the first circuit board 30, the second circuit board 40 extends along the first direction, and the second circuit board 40 and the first circuit board 30 can be connected by plug-in connection, for example, the first circuit board 30 is provided with a slot, and the second circuit board 40 is provided with a protruding part which is inserted into the slot.

[0091] In a possible design, the magnetic core 60 belongs to the second low-voltage area 42, which can reduce the leakage inductance and improve the efficiency. In this possible design, the insulation plate 71 and the second side wall 73 are used to realize the electrical isolation of the magnetic core 60 and the first high-voltage area 31 and the second high-voltage area 41; wherein, referring to Figure 2 、 Figure 3 and Figure 8 , the second side wall 73 includes a first side plate 731, a second side plate 732 and a third side plate 733, the first side plate 731 and the second side plate 732 are oppositely arranged in the second direction (represented by the arrow direction D2) and respectively cover the two opposite surfaces of the magnetic core 60 along the second direction, and the third side plate 733 covers the surface of the magnetic core 60 close to the second high-voltage area 41; the third side plate 733 is provided with a recess 733a to avoid the second circuit board 40; wherein, the second direction is perpendicular to the first direction.

[0092] For example, the magnetic core 60 includes a first magnetic core and a second magnetic core, the second circuit board 40 is located between the first magnetic core and the second magnetic core, and the two ends of the second circuit board 40 are located outside the magnetic core 60. In order to avoid the second circuit board 40, the third side plate 733 is provided with a recess 733a so that the second circuit board 40 passes through the third side plate 733; along the direction perpendicular to the insulation plate 71, the widths of the first side plate 731, the second side plate 732 and the third side plate 733 are substantially equal to the thickness of the magnetic core 60. Referring to Figure 3As shown, since the third side plate 733 is provided with an avoidance groove 733a, the portion of the magnetic core 60 corresponding to the avoidance groove 733a is exposed to the outside, and the vertical distance d between this portion and the components on the second high-voltage area 41 is a straight-line distance that meets safety regulations, for example, 6 mm; and the surface of the magnetic core 60 corresponding to the third side plate 733 is wrapped by the third side plate 733, which increases the creepage distance between the magnetic core 60 and the second high-voltage area 41. Therefore, the straight-line distance between the surface and the components on the second high-voltage area 41 can be reduced, so that more components can be arranged on the second circuit board 40, making full use of the layout space of the second circuit board 40, or the size of the magnetic core 60 along the first direction can be increased, thereby increasing the volume of the magnetic core 60, reducing the loss of the magnetic core 60 and the coil, and improving efficiency.

[0093] In one embodiment, the power adapter further includes a first high-voltage component 80, which is mounted in the first high-voltage region 31. For example, the first high-voltage component 80 is a filter module. The filter module is conventional technology, and its structure is not described in detail.

[0094] In some embodiments, see Figure 2 、 Figure 5 and Figure 6 As shown, the insulation structure 70 also includes a tongue 74, which is connected to the third side plate 733 and extends along the surface of the second circuit board 40 toward the second high-voltage area 41. In a direction perpendicular to the second circuit board 40, the tongue 74 is located between the first high-voltage component 80 and the second circuit board 40, and is used to achieve electrical isolation between the magnetic core 60 and the first high-voltage component 80.

[0095] Since the magnetic core 60 and the first high-voltage component 80 are close to each other, the straight-line distance between them cannot meet the safety requirements. By providing the tongue 74, the air distance between the magnetic core 60 and the first high-voltage component 80 can be increased, thereby extending the safety distance.

[0096] In other embodiments, a switch device is arranged in the high voltage area of ​​the second circuit board 40. In order to prevent the first high voltage component 80 from generating magnetic field interference on the switch device, the tongue piece 74 can be further expanded to form a plate portion. Figure 9 As shown, the insulation structure also includes a third plate portion 75, which is connected to the third side plate 733 and extends along the surface of the second circuit board to the second high-voltage area. The third plate portion 75 is located between the first high-voltage element and the second circuit board, and the projection of the first high-voltage element 80 in the plane where the third plate portion 75 is located is located in the third plate portion 75; wherein, the third plate portion 75 is sprayed with metal powder on the side facing the first high-voltage element to form a metal powder layer to achieve near-field shielding. At the same time, in order to ensure the insulation effect, the part sprayed with metal powder needs to be insulated, such as with varnish (i.e., insulating paint) for insulation.

[0097] In some embodiments, to further enhance the magnetic shielding effect, referring to Figure 10 As shown, the insulating structure can further include a fourth plate portion 76 and a fifth plate portion 77, wherein the fifth plate portion 77 extends from the third side plate 733 to a side close to the first capacitor, and the fourth plate portion 76 is connected to the third plate portion 75 and the fifth plate portion 77 at an end away from the first circuit board. The fourth plate portion 76 and the fifth plate portion 77 are sprayed with metal powder on a side facing the first high-voltage element, forming a metal powder layer, and the part sprayed with metal powder is subjected to insulation treatment, such as bubble varnish (i.e., insulating paint). The third plate portion 75 and the newly added fourth plate portion 76 and fifth plate portion 77 can form a third space, and the first high-voltage element 80 is placed in the third space, which can further enhance the magnetic shielding effect and ensure that the switching device is not disturbed by the magnetic field of the first high-voltage element.

[0098] Referring to Figure 5 As shown, the first circuit board 30 is also provided with an optical coupling module 33, and the optical coupling module 33 is located between the first high-voltage area 31 and the first low-voltage area 32.

[0099] In another possible design, the magnetic core 60 belongs to the second high-voltage area 41, and the insulating plate 71 and the second side portion 73 are used to achieve electrical isolation of the magnetic core 60 from the first low-voltage area 32 and the second low-voltage area 42; wherein the second side portion 73 includes a first side plate 731, a second side plate 732 and a third side plate 733, the first side plate 731 and the second side plate 732 are oppositely arranged in the second direction, and are respectively wrapped around the two opposite surfaces of the magnetic core 60 along the second direction, and the third side plate 733 is wrapped around the surface of the magnetic core 60 close to the second low-voltage area 42; the third side plate 733 is provided with a recess 733a to avoid the second circuit board 40; wherein the second direction is perpendicular to the first direction.

[0100] In one embodiment, referring to Figure 1 and Figure 5 As shown, the first capacitor 50 includes a main body 51 and a pin 52, and the pin 52 of the first capacitor 50 is electrically connected to the first high-voltage area 31, and the main body 51 of the first capacitor 50 extends along the first direction to the first low-voltage area 32; the first side portion 72 includes a first plate portion 721 and a second plate portion 722, the first plate portion 721 is used to achieve electrical isolation of the axial end surface of the first capacitor 50 close to the low-voltage output end 20 from the first low-voltage area 32 and the second low-voltage area 42; and the second plate portion 722 is used to achieve electrical isolation of the circumferential side surface of the first capacitor 50 from the first low-voltage area 32 and the second low-voltage area 42.

[0101] For example, the pin of the first capacitor 50 is welded to the first circuit board 30; the first plate portion 721 is located on the side of the main body of the first capacitor 50 close to the low-voltage output end 20, and the second plate portion 722 wraps the circumferential side of the main body of the first capacitor 50 close to the first circuit board 30, so as to increase the creepage distance of the first capacitor 50 to the first low-voltage area 32 and the second low-voltage area 42.

[0102] In one embodiment, referring to Figure 1 , the first plate portion 721, the first circuit board 30 and the second circuit board 40 are perpendicular to each other, so that the structure of the power adapter is more compact, which is beneficial to realize product miniaturization.

[0103] In one embodiment, referring to Figure 7 and Figure 8 , the second plate portion 722 includes a straight plate 7221 and an arc-shaped plate 7222; the straight plate 7221 is connected to the insulating plate 71 perpendicularly; and the arc-shaped plate 7222 is connected to the straight plate 7221 and is matched with the circumferential side of the first capacitor 50.

[0104] For example, the first capacitor 50 can be an electrolytic capacitor, which is in a cylindrical shape; the axis of the arc-shaped plate 7222 coincides with the axis of the first capacitor 50, so that the electrolytic capacitor can be wrapped better, and no extra space is occupied due to the mismatch of the arc surfaces.

[0105] In one embodiment, referring to Figure 7 , the side of the arc-shaped plate 7222 close to the first high-voltage area 31 is provided with a relief gap 722a for avoiding the pin of the first capacitor 50, so that the pin of the first capacitor 50 can be welded to the first circuit board 30.

[0106] For example, during assembly, the magnetic core 60 and the second circuit board 40 can be installed together first, then the magnetic core 60 is installed in the second space of the insulating structure 70, the first capacitor 50 is installed in the first space of the insulating structure 70, the second circuit board 40 is inserted into the first circuit board 30, and finally the pin of the first capacitor 50 is welded to the first circuit board 30.

[0107] In one embodiment, the insulating structure 70 is an integrally formed structure. For example, the insulating structure 70 can be integrally formed by injection molding. For example, the thicknesses of the parts of the insulating structure 70 can be equal, such as the thickness of the insulating plate 71, the thickness of the first side plate 731, the thickness of the second side plate 732, the thickness of the third side plate 733, the thickness of the first plate portion 721 and the thickness of the second plate portion 722. In order to meet the creepage distance, the thicknesses of the parts are greater than or equal to 0.4 mm.

[0108] In one embodiment, the insulating structure 70 includes a plurality of insulating layers stacked together. Exemplarily, the plurality of insulating layers can be stacked together by lamination. Exemplarily, the number of the insulating layers is greater than or equal to three to meet the safety distance.

[0109] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than limit them. Although the present disclosure has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can still be modified, or some or all of the technical features can be replaced equivalently. Such modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. A power adapter, characterized by, The application relates to an insulation structure of a high-voltage circuit, comprising: a high-voltage input end and a low-voltage output end, which are oppositely arranged along a first direction; a first circuit board and a second circuit board, one end of the first circuit board being electrically connected to the high-voltage input end, the other end being electrically connected to the low-voltage output end, the second circuit board being connected to the first circuit board; along the first direction, the first circuit board comprises a first high-voltage area and a first low-voltage area, the second circuit board comprises a second high-voltage area and a second low-voltage area, the first high-voltage area and the second high-voltage area are arranged close to the high-voltage input end, and the first low-voltage area and the second low-voltage area are arranged close to the low-voltage output end; a first capacitor electrically connected to the first circuit board, a projection of the first capacitor on the first circuit board being located in the first low-voltage area; a transformer electrically connected to the second circuit board, the transformer comprising a magnetic core; and an insulation structure comprising an insulation plate, the insulation plate having opposite first and second surfaces, the first surface being provided with a first side wall part, the first side wall part and the first surface cooperating to form a first space; the second surface being provided with a second side wall part, the second side wall part and the second surface cooperating to form a second space; wherein the first capacitor is arranged in the first space, and the insulation plate and the first side wall part are used to realize electrical isolation of the first capacitor from the first low-voltage area and the second low-voltage area; the magnetic core is arranged in the second space; the insulation plate and the second side wall part are used to realize electrical isolation of the magnetic core from the first high-voltage area and the second high-voltage area, or the insulation plate and the second side wall part are used to realize electrical isolation of the magnetic core from the first low-voltage area and the second low-voltage area.

2. The power adapter of claim 1, wherein, The insulation plate and the second side wall part are used to realize electrical isolation of the magnetic core from the first high-voltage area and the second high-voltage area; wherein the second side wall part comprises a first side plate, a second side plate and a third side plate, the first side plate and the second side plate being oppositely arranged along a second direction and respectively covering two opposite surfaces of the magnetic core along the second direction, and the third side plate covering a surface of the magnetic core close to the second high-voltage area; the third side plate is provided with a recess for avoiding the second circuit board; wherein the second direction is perpendicular to the first direction.

3. The power adapter of claim 2, wherein, The application further comprises a first high-voltage element mounted in the first high-voltage area; the insulation structure further comprises a tongue plate connected to the third side plate and extending along a surface of the second circuit board towards the second high-voltage area, the tongue plate being located between the first high-voltage element and the second circuit board and used to realize electrical isolation of the magnetic core from the first high-voltage element.

4. The power adapter of claim 2, wherein, The application further comprises a first high-voltage element mounted in the first high-voltage area; The insulation structure further comprises a third plate part connected with the third side plate and extending towards the second high-voltage area along the surface of the second circuit board, the third plate part being located between the first high-voltage element and the second circuit board; a projection of the first high-voltage element in a plane in which the third plate part is located is located in the third plate part; and a metal powder layer is arranged on a side of the third plate part facing the first high-voltage element.

5. The power adapter of claim 4, wherein, The insulation structure further comprises a fourth plate part and a fifth plate part, the fifth plate part extending from the third side plate towards a side close to the first capacitor, and the fourth plate part being connected to the third plate part and an end of the fifth plate part away from the first circuit board; the first high-voltage element is located in a third space enclosed by the third plate part, the fourth plate part and the fifth plate part; and a metal powder layer is arranged on a side of the fourth plate part and the fifth plate part facing the first high-voltage element.

6. The power adapter of claim 1, wherein, The insulation plate and the second side enclosing part are used to achieve electrical isolation of the magnetic core from the first low-voltage area and the second low-voltage area. The second side enclosing part comprises a first side plate, a second side plate and a third side plate, the first side plate and the second side plate are oppositely arranged in a second direction, and are respectively wrapped around two opposite surfaces of the magnetic core in the second direction, and the third side plate is wrapped around a surface of the magnetic core close to the second low-voltage area. The third side plate is provided with a recess to avoid the second circuit board. The second direction is perpendicular to the first direction.

7. The power adapter of claim 1, wherein, A pin of the first capacitor is electrically connected to the first high-voltage area, and a main body of the first capacitor extends towards the first low-voltage area along the first direction. The first side enclosing part comprises a first plate part and a second plate part, the first plate part is used to achieve electrical isolation of an axial end surface of the first capacitor close to the low-voltage output end from the first low-voltage area and the low-voltage area of the second circuit board, and the second plate part is used to achieve electrical isolation of a circumferential side surface of the first capacitor from the first low-voltage area and the second low-voltage area.

8. The power adapter of claim 7, wherein, The first plate part is perpendicular to the first circuit board and the second circuit board, and the first circuit board and the second circuit board are perpendicular to each other.

9. The power adapter of claim 7, wherein, The second plate part comprises a straight plate and an arc-shaped plate, the straight plate is perpendicularly connected to the insulation plate, and the arc-shaped plate is connected to the straight plate and is adapted to the circumferential side surface of the first capacitor.

10. The power adapter of claim 9, wherein, A recess is arranged on a side of the arc-shaped plate close to the first high-voltage area to avoid the pin of the first capacitor.

11. The power adapter of any one of claims 1 to 10, wherein, The insulation structure is an integrally formed structure.

12. The power adapter of any one of claims 1 to 10, wherein, The insulation structure comprises a plurality of stacked insulation layers.

13. The power adapter of any one of claims 3 to 5, wherein, The first high-voltage element is a filter module.

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