A metal terminal assembly and switching power supply

Abstract

The utility model discloses a kind of metal terminal assemblies, for as the pin terminal of circuit board, including metal terminal and screw assembled on metal terminal, still including the terminal cover of plastic material, metal terminal is bent from sheet metal, including the connecting sheet in middle layer, the pair of upper side wall in the connecting sheet and the pair of lower side wall in the connecting sheet, the upper end of two upper side wall is equipped with buckle, two lower side walls are straight and one bending combination structure, each welding foot is arranged in the lower part of two lower side walls, the inner folding portion of bending shape lower side wall is used for the support and positioning of metal terminal;Wherein, screw is assembled on connecting sheet, terminal cover is buckled on the buckle of metal terminal upper side wall, to form the false touch protection of metal terminal. Compared with prior art, the utility model metal terminal assembly is integrated by structure optimization, metal terminal and installation terminal cover structure are designed, and product protection requirement is improved by installable and detachable terminal cover. The utility model also discloses a kind of switching power supply including above-mentioned metal terminal assembly.

Description

Technical Field

[0001] This utility model belongs to the field of chassis switching power supplies, specifically relating to a metal terminal assembly and a switching power supply. Background Technology

[0002] Traditional chassis-mounted switching power supplies have metal terminal assemblies consisting of two parts: screws and metal terminals (with solder pads only). When soldering is required, the metal terminals must be placed on the circuit board and manually or wave-soldered before being secured. This structure has several drawbacks: 1. The top of the terminals lacks protection after wiring, easily leading to accidental contact; 2. The bottom support area of ​​the terminals is limited, and there is no pre-positioning structure; 3. The metal terminal body results in insufficient safety clearances due to a compact product layout. Utility Model Content

[0003] This utility model's metal terminal assembly integrates the basic welding function of metal terminals and the snap-on terminal cover function through structural optimization, achieving the effect of metal terminal protection for power supply products during use, making them safer and more reliable.

[0004] To achieve the above-mentioned objectives, this utility model adopts the following technical solution: A metal terminal assembly for use as a pin terminal of a circuit board includes a metal terminal and screws assembled on the metal terminal, and a terminal cover made of plastic. The metal terminal is formed by bending a sheet of metal and includes a connecting piece in the middle layer, a pair of upper sidewalls above the connecting piece, and a pair of lower sidewalls below the connecting piece. The upper ends of the two upper sidewalls are provided with snaps, and the two lower sidewalls are a combination of straight and bent structures. Each of the lower sidewalls is provided with a soldering foot at the lower part. The inner bend of the bent lower sidewall is used for support and positioning of the metal terminal. The screw is assembled on the connecting piece, and the terminal cover is fastened to the snaps on the upper sidewalls of the metal terminal to form a protection against accidental contact of the metal terminal.

[0005] Preferably, the connecting piece of the metal terminal has a rectangular structure, with the upper sidewall bent upward along the two long sides of the connecting piece and the lower sidewall bent downward along the two short sides of the connecting piece.

[0006] Preferably, the straight lower sidewall of the metal terminal has a stepped structure that is thicker at the top and thinner at the bottom, forming welding feet at the thinner parts and a stepped surface at the junction of the thicker and thinner parts; the inner bend of the bent lower sidewall is formed by bending the lower part of the lower sidewall, and the welding feet are located at the lower end of the inner bend, so that the inner bend and the stepped surface of the straight lower sidewall combine to form a support surface for the metal terminal to stand on the circuit board, and the welding feet of the straight lower sidewall and the welding feet of the bent lower sidewall combine to form a two-point positioning welding structure for the metal terminal.

[0007] Preferably, the straight lower sidewall of the metal terminal has a stepped structure that is thicker at the top and thinner at the bottom, forming welding feet at the thinner parts and a stepped surface at the junction of the thicker and thinner parts; the inner bent portion of the bent lower sidewall is formed by bending and protruding the lower sidewall inward along the side edge, and the welding feet are located at the lower end of the inner bent portion, so that the inner bent portion and the stepped surface of the straight lower sidewall combine to form a support surface for the metal terminal to stand on the circuit board, and the welding feet of the straight lower sidewall and the welding feet of the bent lower sidewall combine to form a three-point positioning welding structure for the metal terminal.

[0008] Preferably, the upper sidewall of the metal terminal is an "L" shape rotated 90 degrees clockwise, consisting of an upper arm and a side arm, with the upper arm forming a buckle.

[0009] Preferably, the snap-fit ​​on the upper sidewall of the metal terminal is recessed inward to form a snap-fit ​​groove.

[0010] Preferably, the snap-fit ​​protective surface of the terminal cover is greater than or equal to the projected area of ​​the connecting piece assembled with screws.

[0011] Preferably, the inner bend of the bent lower sidewall of the metal terminal is formed by the extension and bending of the welding leg.

[0012] This utility model also provides a switching power supply, including a circuit board and the aforementioned metal terminal assembly, the metal terminal assembly being assembled on the circuit board.

[0013] Compared with the prior art, the beneficial effects of the metal terminal assembly of this utility model are: 1. The basic welding function of metal terminals and the function of snap-on terminal covers are integrated into one design. After the metal terminals are wired, the top of them has a plastic cover for protection, eliminating the risk of accidental contact and injury during product application. 2. The metal terminals are bent on the side, and the inner bend increases the supporting contact area between the metal terminals and the circuit board, which can better support and position the metal terminals; 3. The soldering leads of the metal terminals can be bent inward and inserted into the PCB circuit board without the need for solder pads, which makes the product layout more compact, ensures product safety compliance, and improves the torque resistance of the soldering leads of the metal terminals. Attached Figure Description

[0014] Figure 1 This is a perspective view of the metal terminal assembly according to the first embodiment of the present utility model; Figure 2 This is a perspective view of the metal terminal assembly according to the first embodiment of the present invention. Figure 3 This is a schematic diagram of the assembly structure of the metal terminal assembly mounted on the circuit board according to the first embodiment of the present invention. Figure 4This is a schematic diagram of the assembly structure of the metal terminal assembly of the first embodiment of the present invention mounted on a circuit board from another perspective. Figure 5 This is a perspective view of the metal terminal of the first embodiment of the present invention; Figure 6 This is a perspective view of the metal terminal of the first embodiment of the present invention from another angle; Figure 7 This is a perspective view of the metal terminal assembly according to the second embodiment of the present invention; Figure 8 This is a perspective view of the metal terminal assembly according to the second embodiment of the present invention. Figure 9 This is a schematic diagram of the assembly structure of the metal terminal assembly mounted on the circuit board according to the second embodiment of the present invention. Figure 10 This is a schematic diagram of the assembly structure of the metal terminal assembly mounted on the circuit board according to another perspective of the second embodiment of the present invention. Figure 11 This is a perspective view of the metal terminal of the second embodiment of the present invention; Figure 12 This is a perspective view of the metal terminal of the second embodiment of the present invention.

[0015] The above-mentioned figures retain structural intersection lines, and the figure references are explained as follows: 10. Terminal cover; 20. Metal terminal, 21. Connecting piece, 22. Upper sidewall, 221. Upper arm (buckle), 222. Sidewall, 224. Slot, 23. Lower sidewall, 23a. Straight lower sidewall, 232a. Stepped surface, 23b. Bent lower sidewall, 233b. Inner bend, 235a. Welding foot (for straight lower sidewall), 235b. Welding foot (for bent lower sidewall); 30. Screws; 60. Circuit board. Detailed Implementation

[0016] The present invention and its beneficial effects will be further described in detail below with reference to specific embodiments and accompanying drawings. However, the specific embodiments of the present invention are not limited thereto.

[0017] First Embodiment Please see Figures 1 to 6This is a structural diagram of the metal terminal assembly according to the first embodiment of the present invention. The metal terminal assembly of the present invention is used as a pin terminal of the circuit board in the chassis switching power supply. It includes a metal terminal 20 and a screw 30 assembled on the metal terminal, and also includes a terminal cover 10 made of plastic. The metal terminal 20 is formed by bending a sheet of metal and includes a connecting piece 21 in the middle layer, a pair of upper sidewalls 22 on the connecting piece, and a pair of lower sidewalls 23 below the connecting piece. The upper ends of the two upper sidewalls are provided with buckles 221. The two lower sidewalls are a combination structure of straight and bent. Each of the lower sidewalls is provided with a welding foot 235. The inner bend portion 236 of the bent lower sidewall is used for the support and positioning of the metal terminal. The screw 30 is assembled on the connecting piece 21, and the terminal cover 10 is fastened to the buckle 221 on the upper sidewall of the metal terminal to form a protection against accidental contact of the metal terminal. The metal terminals have a protective cap on top after wiring, eliminating the risk of accidental contact and damage during product application. The side bends of the metal terminals, with the inner bend increasing the support contact area between the metal terminals and the circuit board, provide better support and positioning. The soldering leads of the metal terminals can be bent inwards and inserted into the PCB circuit board without the need for solder pads, allowing for a more compact power supply layout, meeting safety regulations, and improving the torsional strength of the metal terminal soldering leads. Therefore, the overall performance of the metal terminal assembly is significantly optimized through system optimization design.

[0018] Preferably, the connecting piece 21 of the metal terminal has a rectangular structure, with the upper sidewall 22 bent upward along the two long sides of the connecting piece and the lower sidewall 23 bent downward along the two short sides of the connecting piece.

[0019] The metal terminal has a straight and bent combination structure on its two lower sidewalls, namely a straight lower sidewall 23a and a bent lower sidewall 23b (hereinafter, the detailed structure number of the straight lower sidewall is suffixed with 'a', and the detailed structure number of the bent lower sidewall is suffixed with 'b'). The straight lower sidewall 23a is a stepped structure that is thicker at the top and thinner at the bottom, forming a welding foot 235a in the details and a stepped surface 232a at the junction of the thick and thin parts. The inner bent portion 233b of the bent lower sidewall 23b is formed by bending the lower part of the lower sidewall. The welding foot 235b is located at the lower end of the inner bent portion, so that the inner bent portion 233b and the stepped surface 232a of the straight lower sidewall combine to form a support surface for the metal terminal to stand on the circuit board, and the welding foot 235a of the straight lower sidewall and the welding foot 235b of the bent lower sidewall combine to form a two-point positioning welding structure for the metal terminal.

[0020] The upper sidewall 22 of the metal terminal is L-shaped, rotated 90 degrees clockwise, and is composed of an upper arm 221 and a side arm 222, with the upper arm 221 forming a snap-fit. The snap-fit ​​protective surface of the terminal cover 10 is greater than or equal to the projected area of ​​the connecting piece 21 assembled with screws. Please see details Figure 5The upper part of the metal terminal 20 includes a bent upper arm 221 and a buckle with an arc design formed by the upper arm. The front and rear arc surfaces of the buckle are recessed to form a slot 224 for mounting the terminal cover 10.

[0021] Please see Figure 6 The lower part of the metal terminal 20 mainly includes a bent lower side wall inner bend 233b, an inner bend downward welding foot 235b, and a straight lower side wall welding foot 235a. The inner bend welding foot 235b and the straight welding foot 235a can be inserted into the circuit board for soldering and fixing.

[0022] Please see Figure 3 , Figure 4 The metal terminal assembly of this utility model is assembled with terminal cover 10, metal terminal 20 and screw 30 and then soldered to circuit board 60.

[0023] Compared with traditional metal terminal assemblies, this utility model integrates the basic welding function of traditional metal terminals with the installation structure function of plastic terminal covers, optimizing a portion of the welding feet to be bent and supported on the circuit board surface. This improves the compressive strength of the screws when tightened from top to bottom during use, thereby achieving the protective effect of metal terminals with covers in the power supply product during use, making it safer and more reliable. The optimized welding feet also make the structure more stable and reliable during use.

[0024] Second Embodiment Please see Figures 7 to 12 This is a structural diagram of the metal terminal assembly according to the second embodiment of the present invention. The difference between the metal terminal assembly of the second embodiment and the first embodiment lies in the inner bending portion of the bent lower sidewall of the metal terminal. Specifically, in the metal terminal assembly of the present invention, the straight lower sidewall 23a of the metal terminal has a stepped structure that is thicker at the top and thinner at the bottom, forming welding feet 235a at the thinner part and a stepped surface 232a at the junction of the thicker and thinner parts. The inner bending portion 233b of the bent lower sidewall 23b is formed by bending and protruding inward along the side edge of the lower sidewall. The welding feet 235b are located at the lower end of the inner bending portion, so that the inner bending portion 233b and the stepped surface 232a of the straight lower sidewall combine to form a support surface for the metal terminal to stand on the circuit board, and the welding feet 235a of the straight lower sidewall and the welding feet 235b of the bent lower sidewall combine to form a three-point positioning welding structure for the metal terminal. The welding feet are distributed in a triangular pattern on the circuit board, providing structural stability and significantly improving torsional and compressive strength during use.

[0025] The above-described metal terminal assembly includes a metal terminal, screws, and a plastic terminal cover. The upper left and right sides of the metal terminal are bent upwards to engage with the terminal cover. The connecting piece area with the screw in the middle can be used for wiring. The lower welding feet are used for soldering onto the circuit board, and the inner bent portion is used for supporting and positioning the metal terminal. This utility model metal terminal assembly integrates the metal terminal and the terminal cover structure through structural optimization, and the detachable terminal cover improves the protection function of the power supply product.

[0026] The above embodiments are only used to help understand the inventive concept and technical solution of this utility model. For those skilled in the art, other equivalent application schemes that can be naturally associated with the above description and examples without departing from the principle of this invention, as well as some simple substitutions, improvements and modifications to this utility model, all fall within the protection scope of the claims of this utility model.

Claims

1. A metal terminal assembly for use as a pin terminal on a circuit board, comprising metal terminals and screws assembled on the metal terminals, characterized in that: It also includes terminal covers made of plastic. The metal terminal is formed by bending a sheet of metal, including a connecting piece in the middle layer, a pair of upper sidewalls above the connecting piece, and a pair of lower sidewalls below the connecting piece. The upper ends of the two upper sidewalls are equipped with snap-fit ​​mechanisms. The two lower sidewalls are a combination of a straight and a bent section. Each lower sidewall has a welding foot at its lower part. The inner bend of the bent lower sidewall is used for support and positioning of the metal terminal. Screws are assembled on the connecting piece, and the terminal cover is fastened to the snap on the upper side wall of the metal terminal to form a protection against accidental contact with the metal terminal.

2. The metal terminal assembly according to claim 1, characterized in that: The connecting piece of the metal terminal has a rectangular structure, with the upper sidewall bent upwards along the two long sides of the connecting piece and the lower sidewall bent downwards along the two short sides of the connecting piece.

3. The metal terminal assembly according to claim 1, characterized in that: The straight lower sidewall of the metal terminal has a stepped structure that is thicker at the top and thinner at the bottom, forming welding feet at the thinner parts and a stepped surface at the junction of the thicker and thinner parts; the inner bend of the bent lower sidewall is formed by bending the lower part of the lower sidewall, and the welding feet are located at the lower end of the inner bend, so that the inner bend and the stepped surface of the straight lower sidewall combine to form a support surface for the metal terminal to stand on the circuit board, and the welding feet of the straight lower sidewall and the welding feet of the bent lower sidewall combine to form a two-point positioning welding structure for the metal terminal.

4. The metal terminal assembly according to claim 1, characterized in that: The straight lower sidewall of the metal terminal has a stepped structure that is thicker at the top and thinner at the bottom, forming welding feet at the thinner parts and a stepped surface at the junction of the thicker and thinner parts; the inner bent part of the bent lower sidewall is formed by bending and protruding the lower sidewall inward along the side edge, and the welding feet are located at the lower end of the inner bent part, so that the inner bent part and the stepped surface of the straight lower sidewall combine to form a support surface for the metal terminal to stand on the circuit board, and the welding feet of the straight lower sidewall and the welding feet of the bent lower sidewall combine to form a three-point positioning welding structure for the metal terminal.

5. The metal terminal assembly according to claim 1, characterized in that: The upper sidewall of the metal terminal is an "L" shape rotated 90 degrees clockwise, consisting of an upper arm and a side arm, with the upper arm forming a buckle.

6. The metal terminal assembly according to claim 1, characterized in that: The buckle on the upper sidewall of the metal terminal is recessed inward on the front and rear arc surfaces to form a slot.

7. The metal terminal assembly according to claim 1, characterized in that: The snap-fit ​​protective surface of the terminal cover is greater than or equal to the projected area of ​​the connecting piece assembled with screws.

8. The metal terminal assembly according to claim 1, characterized in that: The inner bend of the bent lower sidewall of the metal terminal is formed by the extension and bending of the welding leg.

9. A switching power supply, comprising a circuit board, characterized in that: It also includes a metal terminal assembly as described in any one of claims 1 to 8, the metal terminal assembly being assembled on a circuit board.

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