Power adapter

Abstract

A power adapter includes a body and a plug. The body includes a top plate, a first side wall, a second side wall, a stopper portion, and an engaging portion. The first and second side walls are located on two opposite sides of the top plate, and form a receiving groove with the top plate and the stopper portion. The engaging portion is a notch between the first side wall and the stopper portion or a through hole on the first side wall. The plug is arranged in the receiving groove and includes a first side plate and a second side plate arranged oppositely. The first side plate is provided with a gap, which divides the first side plate into a stationary portion and a movable portion. The movable portion is provided with a bump, which engages with the engaging portion. Inner surfaces of the first and second side walls are separated by a first distance. Outer surfaces of the first and second side plates are separated by a second distance. An outer edge of the bump and the outer surface of the second side plate are separated by a third distance. The first distance is greater than or equal to the second distance and is less than the third distance.

Description

[Technical Field]

[0001] This disclosure relates to a power adapter. [Previous Technology]

[0002] Some existing power adapters have interchangeable plugs, allowing users to replace them with plugs of different national standards, which is very convenient for users who frequently travel to different countries. However, existing power adapters still need improvement in terms of the ease of installation and removal of interchangeable plugs and structural reliability. [Summary of the Invention]

[0003] To solve the aforementioned technical problems, this disclosure provides a power adapter with a replaceable plug, which has high structural reliability and makes the installation and removal of the replaceable plug more intuitive and convenient.

[0004] This disclosure provides a power adapter comprising a body and a plug. The body includes a top plate, a first side wall, a second side wall, a stop portion, and a engaging portion. The first and second side walls are located on opposite sides of the top plate and form a receiving groove with the top plate and the stop portion. The engaging portion is a recess between the first side wall and the stop portion, or a through hole on the first side wall. The plug is disposed in the receiving groove and includes a first side plate and a second side plate disposed opposite to each other. The first side plate has a gap that divides the first side plate into a fixed portion and a movable portion. The movable portion has a protrusion for engaging with the engaging portion. The inner surface of the first side wall is spaced apart from the inner surface of the second side wall by a first distance, the outer surface of the first side plate is spaced apart from the outer surface of the second side plate by a second distance, and the outer edge of the protrusion is spaced apart from the outer surface of the second side plate by a third distance. The first distance is greater than or equal to the second distance and less than the third distance.

[0005] In one or more embodiments, a limiting member is provided on the first sidewall, the limiting member being located on the inner surface of the first sidewall and protruding toward the second sidewall. The protrusion is provided with a groove, and a portion of the groove and the gap form a sliding groove structure, the limiting member slidingly engaging with the sliding groove structure.

[0006] In one or more embodiments, a limiting member is provided on the first side wall. The limiting member is located on the upper surface of the first side wall and protrudes toward the second side wall. The first side plate is slidably disposed between the limiting member and the top plate.

[0007] In one or more embodiments, the plug is provided with a baffle, the baffle is close to the inner surface of the movable part, and the distance between the outer surface of the baffle and the inner surface of the movable part is greater than or equal to the width of the protrusion.

[0008] In one or more embodiments, the plug is further provided with a support member, which connects the first side plate and the baffle.

[0009] In one or more embodiments, the support is located at one-half to one-third of the length of the first side plate, measured from the front edge of the first side plate.

[0010] In one or more embodiments, the width of the bump is greater than the width of the movable part, or the length of the movable part is greater than the length of the bump.

[0011] In one or more embodiments, the front end of the protrusion has an arc surface.

[0012] In one or more embodiments, the top plate is provided with a limiting member, which includes a vertical portion substantially perpendicular to the top plate and a horizontal portion substantially parallel to the top plate, the horizontal portion being connected to the vertical portion and spaced apart from the top plate by part or all of the vertical portion. The plug is provided with a limiting groove corresponding to the limiting member.

[0013] In one or more embodiments, the limiting member is connected to the surface of the stop portion facing the receiving groove.

Implementation Method

[0014] To make the description of this disclosure more detailed and complete, reference may be made to the accompanying drawings and the various embodiments described below. The elements in the drawings are not drawn to scale and are provided for illustrative purposes only. Many practical details are described below to provide a comprehensive understanding of this disclosure; however, those skilled in the art should understand that this disclosure can be practiced without one or more of these practical details, and therefore, these details should not be used to limit this disclosure.

[0015] Referring to Figures 1 and 2, this disclosure provides a power adapter 19, which includes a body 20 and a plug 50 detachably assembled to the body 20. Referring to Figure 2, the body 20 includes a top plate 29, a first side wall 31, a second side wall 32, a stop portion 24, and a locking portion 26. The first side wall 31 and the second side wall 32 are located on opposite sides of the top plate 29 and form receiving grooves 25 with the top plate 29 and the stop portion 24. Specifically, the first side wall 31 is located on the first side 291 of the top plate 29. The second side wall 32 is located on the second side 292 of the top plate 29. The stop portion 24 is located on the third side 293 of the top plate 29. The first side 291 and the second side 292 are opposite sides of the top plate 29 and are both connected to the third side 293. The locking portion 26 is a notch between the first side wall 31 and the stop portion 24.

[0016] Referring to Figures 1 and 2, the plug 50 is detachably disposed in the receiving groove 25 of the body 20. The first sidewall 31 and the second sidewall 32 are used to guide the plug 50 into or out of the receiving groove 25 along the first direction K1 or its opposite direction, and to prevent the assembled plug 50 from moving along the second direction K2 or its opposite direction. During assembly, the stop 24 is used to assist the plug 50 in stopping at the desired position. The first direction K1 is substantially parallel to the first side 291 of the top plate 29. The second direction K2 is substantially parallel to the third side 293 of the top plate 29 and substantially perpendicular to the first direction K1.

[0017] Referring to Figures 1 and 2, the plug 50 includes a first side plate 61 and a second side plate 62 disposed opposite to each other. The first side plate 61 has a slot 53. The slot 53 divides the first side plate 61 into a fixed part 55 and a movable part 56. The movable part 56 has a protrusion 57 for engaging with the engaging part 26. The protrusion 57 may be disposed at the end of the movable part 56 and protrude outward from the movable part 56. Referring to Figure 2, the inner surface of the first side wall 31 and the inner surface of the second side wall 32 are separated by a first distance T1. The outer surface of the first side plate 61 and the outer surface of the second side plate 62 are separated by a second distance T2. The outer edge of the protrusion 57 of the first side plate 61 and the outer surface of the second side plate 62 are separated by a third distance T3. The first distance T1 is greater than or equal to the second distance T2 and less than the third distance T3.

[0018] With the aforementioned structural configuration, the user only needs to apply force to push the plug 50 into the receiving groove 25 along the first direction K1 to assemble the plug 50 onto the body 20. Specifically, when the user applies force to push the plug 50 into the receiving groove 25 along the first direction K1, part of the applied force acts on the first side wall 31 through the protrusion 57, causing the first side wall 31 to generate a reaction force on the protrusion 57. The reaction force causes the movable part 56 to bend inward and store elastic force (i.e., elastic deformation), causing the protrusion 57 to enter the receiving groove 25 and abut against the inner surface of the first side wall 31. Then, the protrusion 57 continues to abut against the first side wall 31 and moves toward the stop part 24. When the protrusion 57 moves to the position of the corresponding engaging part 26, the movable part 56 returns to its original state and releases the elastic force, causing the protrusion 57 to automatically engage in the engaging part 26, thereby completing the assembly of the plug 50 and the body 20. The protrusion 57 and the engaging portion 26 are used to prevent the assembled plug 50 from moving along the first direction K1 and its opposite direction, or even from dislodging from the receiving groove 25. When the user wants to remove the plug 50 from the body 20, the user only needs to press the protrusion 57 inward to make the protrusion 57 disengage from the engaging portion 26, and then push the plug 50 out of the receiving groove 25 along the opposite direction of the first direction K1.

[0019] Referring to Figure 1, in one embodiment, in the first direction K1, the length of the movable part 56 is greater than the length of the protrusion 57, thereby increasing the elasticity of the movable part 56. In one embodiment, in the third direction K3, the width of the protrusion 57 is greater than the width of the movable part 56, thereby increasing the stability of the protrusion 57 engaging with the engaging part 26. The third direction K3 is substantially perpendicular to the top plate 29, and substantially perpendicular to the first direction K1 and the second direction K2. In one embodiment, the front end of the protrusion 57 has an arc surface 54 to reduce the resistance when pushing the plug 50 into the receiving groove 25.

[0020] Referring to Figures 2 and 3, in one embodiment, the first sidewall 31 of the body 20 is provided with a first limiting member 41. The first limiting member 41 is located on the inner surface of the first sidewall 31 and protrudes toward the second sidewall 32. The first limiting member 41 may be a slide rail extending along a first direction K1. The protrusion 57 of the first side plate 61 of the plug 50 is provided with a groove 63, which forms a groove structure 64 with a portion of the gap 53. Specifically, the groove 63 of the protrusion 57 extends along the first direction K1 and forms a groove structure 64 with a portion of the gap 53 extending along the first direction K1. That is, the groove structure 64 extends along the first direction K1. In the third direction K3, the groove 63 and the gap 53 may be aligned with each other and have the same or similar width. The first limiting member 41 and the groove structure 64 are slidably engaged. The first limiting member 41 and the sliding groove structure 64 are used to guide the plug 50 to slide into the receiving groove 25 along the first direction K1 during assembly and to guide the plug 50 to slide out of the receiving groove 25 along the opposite direction of the first direction K1 during disassembly. After assembly, the first limiting member 41 is located in the portion of the gap 53 extending along the first direction K1, which prevents the assembled plug 50 from moving in the third direction K3 and disengaging from the receiving groove 25.

[0021] As shown in Figures 1 and 2, in one embodiment, the second side plate 62 of the plug 50 may have the same structure as the first side plate 61, that is, it also has the same gap 53, fixing part 55, movable part 56, and protrusion 57. The second side wall 32 of the body 20 may have another engaging part 26 between it and the stop part 24, which is a notch between the second side wall 32 and the stop part 24, for engaging with the protrusion 57 of the second side plate 62. Referring to Figure 1, when the second side plate 62 has the protrusion 57, the outer edge of the protrusion 57 of the second side plate 62 is spaced from the outer surface of the first side plate 61 by a fourth distance T4. Referring to Figures 1 and 2, the first distance T1 is greater than or equal to the second distance T2 and less than the fourth distance T4.

[0022] Referring to Figures 2 and 3, in one embodiment, the second sidewall 32 of the body 20 may be provided with a second limiting member 42. The second limiting member 42 is located on the inner surface of the second sidewall 32 and protrudes toward the first sidewall 31. The protrusion 57 of the second side plate 62 of the plug 50 is also provided with a groove 63, which forms a sliding groove structure 64 with a portion of the gap 53 of the second side plate 62 extending along the first direction K1. The second limiting member 42 is configured to slide into the sliding groove structure 64 to further guide the plug 50 to slide into and out of the receiving groove 25 along the first direction K1. After assembly, the second limiting member 42 is located within the portion of the gap 53 extending along the first direction K1, which prevents the plug 50 from moving in the third direction K3 and disengaging from the receiving groove 25.

[0023] Please refer to Figure 7, which is a cross-sectional view of a power adapter according to another embodiment of this disclosure. In this embodiment, the first sidewall 31 of the body 20 is provided with a first limiting member 41B, which is located on the upper surface of the first sidewall 31 and protrudes toward the second sidewall 32. The second sidewall 32 of the body 20 is provided with a second limiting member 42B, which is located on the upper surface of the second sidewall 32 and protrudes toward the first sidewall 31. The plug 50 is located between the second limiting member 42B and the top plate 29. The first limiting member 41B, the first sidewall 31, and the top plate 29 form a guide groove, and the second limiting member 42B, the second sidewall 32, and the top plate 29 form a guide groove. These two guide grooves are used to guide the plug 50 to slide into and out of the receiving groove 25 along the first direction K1, and to prevent the assembled plug 50 from moving in the third direction K3 and dislodging from the receiving groove 25. Specifically, the first side plate 61 of the plug 50 slides between the first limiting member 41B and the top plate 29, and the second side plate 62 of the plug 50 slides between the second limiting member 42B and the top plate 29. After assembly, the first limiting member 41B and the second limiting member 42B are located on the top wall 58 of the plug 50. In this embodiment, the protrusion 57 of the first side plate 61 and the protrusion 57 of the second side plate 62 of the plug 50 do not need to be provided with grooves.

[0024] Referring to Figures 2, 4, 5, and 6, in some embodiments, the top plate 29 of the body 20 is further provided with at least one third limiting member 43. Each third limiting member 43 includes at least one vertical portion 44 substantially perpendicular to the top plate 29 and at least one horizontal portion 45 substantially parallel to the top plate 29. The at least one horizontal portion 45 is connected to a vertical portion 44 and is spaced apart from the top plate 29 by at least a portion of the vertical portion 44. The plug 50 is provided with a limiting groove 65 corresponding to the at least one third limiting member 43. The shape of the limiting groove 65 matches the shape of the third limiting member 43 so that the third limiting member 43 can be inserted into and disengaged from the limiting groove 65 along the first direction K1, the horizontal portion 45 can prevent the assembled plug 50 from moving in the third direction K3, and the vertical portion 44 can prevent the assembled plug 50 from moving in the second direction K2 and its opposite direction.

[0025] Referring to Figures 2, 4, and 5, in one embodiment, the top plate 29 is provided with a third limiting member 43, which includes a vertical portion 44 and a horizontal portion 45. The horizontal portion 45 is separated from the top plate 29 by the entire vertical portion 44, and the horizontal portion 45 and the vertical portion 44 form a T-shaped structure. That is, the third limiting member 43 is a T-shaped structure.

[0026] Referring to Figure 6, in another embodiment, the top plate 29 is provided with two third limiting members 43, each third limiting member 43 comprising a vertical portion 44 and a horizontal portion 45. The horizontal portion 45 is separated from the top plate 29 by the entire vertical portion 44, and the horizontal portion 45 and the vertical portion 44 form an L-shaped structure. That is, the third limiting members 43 are two L-shaped structures. In other embodiments, the third limiting members 43 may also be one or more structures of E-shape, F-shape, H-shape, or other suitable geometric shapes. Furthermore, the top plate 29 may also be provided with multiple third limiting members of different geometric shapes or sizes.

[0027] Referring to Figure 2, in one embodiment, the third limiting member 43 is connected to the surface 240 of the stop portion 24 facing the receiving groove 25. In other embodiments, the third limiting member 43 may also be separately provided from the stop portion 24.

[0028] As shown in Figure 5, in one embodiment, the plug 50 is provided with a first baffle 671, which is close to the inner surface of the movable portion 56 of the first side plate 61. The first baffle 671 is substantially parallel to the first side plate 61. In the second direction K2, the fifth distance T5 between the outer surface of the first baffle 671 and the inner surface of the movable portion 56 of the first side plate 61 is greater than or equal to the width W of the protrusion 57. The outer surface of the first baffle 671 is the surface of the first baffle 671 away from the center of the plug 50. The inner surface of the movable portion 56 of the first side plate 61 is the surface of the movable portion 56 of the first side plate 61 close to the center of the plug 50. The first baffle 671 is configured to prevent the movable portion 56 of the first side plate 61 from bending excessively inward and breaking. In another embodiment, when the second side plate 62 is provided with a movable part 56 and a protrusion 57, the plug 50 may be provided with a second baffle 672. The second baffle 672 is close to the inner surface of the movable part 56 of the second side plate 62 to prevent the movable part 56 of the second side plate 62 from bending inward excessively and breaking.

[0029] As shown in Figure 5, in one embodiment, the plug 50 is further provided with a first support member 681. The first support member 681 connects the first side plate 61 and the first baffle 671 to support the first side plate 61 and the first baffle 671, thereby increasing the structural stability of the plug 50 and reducing the risk of the movable part 56 of the first side plate 61 breaking due to inward bending. The first support member 681 may be located at one-half to one-third of the length of the first side plate 61, measured from the leading edge 610 of the first side plate 61. In one embodiment, the first support member 681 may be located near one end of the gap 53 of the first side plate 61.

[0030] As shown in Figure 5, in another embodiment, the plug 50 may be provided with a second support member 682. The second support member 682 connects the second side plate 62 and the second baffle 672 to support the second side plate 62 and the second baffle 672, thereby increasing the structural stability of the plug 50 and reducing the risk of breakage of the movable part 56 of the second side plate 62 due to inward bending. The second support member 682 may be located at one-half to one-third of the length of the second side plate 62, measured from the leading edge 620 of the second side plate 62. The second support member 682 may be located near one end of the gap 53 of the second side plate 62. In this embodiment, the second support member 682 is provided at a position corresponding to the first support member 681, but is not limited thereto.

[0031] Referring to Figures 2 and 5, in one embodiment, the protrusion 57 of the plug 50 is located below the top wall 58, and the top wall 58 covers a portion of the protrusion 57. Referring to Figure 8, in another embodiment, the upper surface of the protrusion 57 is substantially flush with the upper surface of the top wall 58, and the protrusion 57 is spaced apart from the top wall 58 by a distance.

[0032] Referring to Figure 2, in one embodiment, the stop portion 24 is disposed on the third side 293 of the top plate 29 and extends from the first side 291 of the top plate 29 to the second side 292. Referring to Figure 9, in another embodiment, the stop portion 24 may occupy only a portion of the third side 293 of the top plate 29. In this embodiment, the stop portion 24 is disposed in the middle of the third side 293 of the top plate 29, but is not limited thereto. The stop portion 24 may also be close to or adjacent to the first side 291 or the second side 292 of the top plate 29. Referring to Figures 10 and 11, in other embodiments, the stop portion 24 may include two or more stops 241. As shown in Figure 10, the stop portion 24 includes two stops 241, which are respectively adjacent to the first side 291 and the second side 292 of the top plate 29. As shown in Figure 11, the stop portion 24 includes three stops 241 spaced apart, which are respectively located at both ends and the middle of the third side 293 of the top plate 29. The shape, size and / or height of the aforementioned stop 24 or stop block 241 can be adjusted according to actual needs, as long as the stop 24 or stop block 241 can stop the auxiliary plug 50 in the required position during assembly.

[0033] Referring to Figure 2, in the aforementioned embodiment, the engaging portion 26 is a recess between the first sidewall 31 and the stop portion 24, or a recess between the second sidewall 32 and the stop portion 24. Referring to Figure 9, in another embodiment, the engaging portion 26 may be a through hole on the first sidewall 31, or a through hole on the second sidewall 32. The engaging portion 26 can divide the first sidewall 31 or the second sidewall 32 into two sections.

[0034] When the body 20 has two engaging portions 26, the following embodiments are provided. Referring to Figure 2, in one embodiment, the two engaging portions 26 are recesses between the first sidewall 31 and the stop portion 24, and recesses between the second sidewall 32 and the stop portion 24. Referring to Figures 9 and 10, in some embodiments, the two engaging portions 26 are through holes on the first sidewall 31 and through holes on the second sidewall 32, respectively. Referring to Figure 9, the two engaging portions 26 can be aligned in the first direction K1. Referring to Figure 10, the two engaging portions 26 can be misaligned in the first direction K1. The positions of the two engaging portions 26 in the first direction K1 can be adjusted as needed. Referring to Figure 11, in one embodiment, the two engaging portions 26 are through holes on the first sidewall 31 and recesses between the second sidewall 32 and the stop portion 24, respectively. Conversely, the two engaging portions 26 may also be a notch between the first sidewall 31 and the stop portion 24, and a through hole in the second sidewall 32.

[0035] The above describes various embodiments of the stop portion 24 and various embodiments of the engaging portion 26. Figures 2 and 9 to 11 illustrate four combinations of the stop portion 24 and the engaging portion 26, but the present invention is not limited thereto. Different combinations can be made according to actual needs.

[0036] Referring to Figure 2, in one embodiment, the body 20 further includes two conductive spring contacts 22 passing through the top plate 29, and the plug 50 further includes two pins 51 passing through the top wall 58. When the plug 50 is assembled to the body 20, the conductive spring contacts 22 contact the pins 51. Referring to the preceding text, the first side wall 31, the second side wall 32, the stop portion 24, the engaging portion 26, the protrusion 57, the first limiting member 41 or 41B, the second limiting member 42 or 42B, the gap 53, the third limiting member 43 and / or the limiting groove 65 can restrict the movement of the assembled plug 50 in the first direction K1, the second direction K2 and / or the third direction K3, which improves the bonding stability between the plug 50 and the body 20, thereby enabling the pins 51 to stably contact the conductive spring contacts 22.

[0037] Referring to Figure 5, in some embodiments, the plug 50 further includes a first partition 691 and a second partition 692 respectively located on two opposite sides of the limiting groove 65. A portion of one pin 51 of the plug 50 is located between the first partition 691 and the first baffle 671, and a portion of the other pin 51 is located between the second partition 692 and the second baffle 672. When the plug 50 is combined with the body 20, a conductive spring 22 of the body 20 is located between the first partition 691 and the first baffle 671 and contacts the corresponding pin 51, and another conductive spring 22 is located between the second partition 692 and the second baffle 672 and contacts the corresponding pin 51. In one embodiment, a first support member 681 may extend and connect to the first partition 691 to support the first partition 691. A second support member 682 may extend and connect to the second partition 692 to support the second partition 692.

[0038] In the foregoing embodiment, the plug 50 is of Taiwanese standard, but is not limited thereto. The plug 50 may also be of other national standards, such as: American standard, European standard, Chinese standard, British standard, Australian standard, Korean standard and Indian standard. According to the specifications of the plug 50, the pins 51 have corresponding numbers, shapes, positions and angles, and other components such as the first partition 691 and the second partition 692 can also be adapted to the design.

[0039] Although this disclosure has been disclosed above with reference to embodiments, it is not intended to limit this disclosure. Anyone skilled in the art can make various modifications and alterations without departing from the spirit and scope of this disclosure. Therefore, the scope of protection of this disclosure shall be determined by the appended claims. [Simplified Explanation of the Diagram]

[0040] Figure 1 is a schematic diagram of a power adapter according to one embodiment of the present disclosure; Figure 2 is an exploded view of the power adapter shown in Figure 1; Figure 3 is a cross-sectional view of the power adapter shown in Figure 1 at line segment 3-3'; Figure 4 is a cross-sectional view of the power adapter shown in Figure 1 at line segment 4-4'; Figure 5 is a schematic diagram of the plug of the power adapter shown in Figure 1; Figure 6 is a cross-sectional view of a power adapter according to another embodiment of the present disclosure; Figure 7 is a cross-sectional view of a power adapter according to another embodiment of the present disclosure; Figure 8 is a side view of the plug according to another embodiment of the present disclosure; Figure 9 is a top view of a power adapter according to another embodiment of the present disclosure; Figure 10 is a top view of a power adapter according to another embodiment of the present disclosure; Figure 11 is a top view of a power adapter according to another embodiment of the present disclosure.

Claims

1. A power adapter, comprising: a body including a top plate, a first side wall, a second side wall, a stop portion, and a engaging portion, the first side wall and the second side wall being located on opposite sides of the top plate and forming a receiving groove with the top plate and the stop portion, the engaging portion being a recess between the first side wall and the stop portion, or a through hole on the first side wall; and a plug disposed in the receiving groove, including a first side plate and a second side plate disposed opposite to each other, the first side plate having a slot dividing the first side plate into a fixed portion and a movable portion, the movable portion having a protrusion for engaging with the engaging portion, wherein... The inner surface of the first sidewall is spaced apart from the inner surface of the second sidewall by a first distance, the outer surface of the first sideplate is spaced apart from the outer surface of the second sideplate by a second distance, and the outer edge of the protrusion is spaced apart from the outer surface of the second sideplate by a third distance. The first distance is greater than or equal to the second distance and less than the third distance.

2. The power adapter as claimed in claim 1, wherein the first sidewall is provided with a limiting member, the limiting member is located on the inner surface of the first sidewall and protrudes toward the second sidewall, the protrusion is provided with a groove, the groove and a portion of the gap form a sliding groove structure, and the limiting member slides in engagement with the sliding groove structure.

3. The power adapter as claimed in claim 1, wherein the first sidewall is provided with a limiting member located on the upper surface of the first sidewall and protruding toward the second sidewall, and the first side plate is slidably disposed between the limiting member and the top plate.

4. The power adapter as claimed in claim 1, wherein the plug is provided with a baffle near the inner surface of the movable part, and the distance between the outer surface of the baffle and the inner surface of the movable part is greater than or equal to the width of the protrusion.

5. The power adapter as claimed in claim 4, wherein the plug is further provided with a support member that connects the first side plate and the baffle.

6. The power adapter as claimed in claim 5, wherein the support is located at one-half to one-third of the length of the first side panel, measured from the front edge of the first side panel.

7. The power adapter as claimed in claim 1, wherein the width of the protrusion is greater than the width of the movable part, or the length of the movable part is greater than the length of the protrusion.

8. The power adapter as claimed in claim 1, wherein the front end of the protrusion has an arcuate surface.

9. The power adapter as claimed in claim 1, wherein the top plate is provided with a limiting member comprising a vertical portion substantially perpendicular to the top plate and a horizontal portion substantially parallel to the top plate, the horizontal portion being connected to the vertical portion and spaced from the top plate by part or all of the vertical portion, and the plug being provided with a limiting groove corresponding to the limiting member.

10. The power adapter as claimed in claim 9, wherein the limiting member is connected to a surface of the stop portion facing the receiving groove.

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