Low-inductance capacitor

Abstract

The utility model relates to a low-inductance capacitor, which comprises a shell, an opening is arranged on the shell, a capacitor core is arranged in the shell, metal spraying surfaces at two ends of the capacitor core are respectively welded with a leading-out insertion sheet, the leading-out insertion sheets extend out of the shell through the opening, and potting materials for fixing the capacitor core and the leading-out insertion sheets are encapsulated in the shell. The lower part of the lead-out insertion sheet extends to the side of the capacitor core, the side edge of the lower part of the lead-out insertion sheet is integrally connected with a plurality of fins which are arranged at intervals, and the plurality of fins are folded to the outside of the two ends of the capacitor core through first bends and are directly welded on the metal spraying surface; the lead-out insertion piece is adopted on the capacitor, the bending distance and the bending size can be adjusted at will according to the pitch requirement through the integrated fins, any size of a capacitor core is guaranteed, the pitch requirement of a capacitor product can be met, and it is effectively guaranteed that the stray inductance of the product is small.

Description

Technical Field

[0001] The utility model relates to the field of capacitors, in particular to a low-inductance capacitor. Background Art

[0002] At present, the structure of the capacitor mainly includes a shell, a capacitor core is placed in the shell, lead-out plugs are welded to the gold-sprayed surfaces at both ends of the capacitor core, the lead-out plugs extend out of the shell through the opening, and the shell is filled with a potting material for fixing the capacitor core and the lead-out plugs, wherein some lead-out plugs are composed of multi-section connections, and multi-section connections will have large inductance, affecting the performance of the capacitor. In addition, in the production process, the capacitor core size and film width required by users are different. Therefore, it is necessary to design a lead-out plug that can adjust the bending distance and bending size according to user needs for users to choose and use. Summary of the invention

[0003] The utility model aims to provide a low-inductance capacitor with simple and reasonable structure, convenient installation and stable structure.

[0004] A low inductance capacitor comprises a shell, an opening is provided on the shell, a capacitor core is placed in the shell, lead-out plugs are respectively welded to the gold-sprayed surfaces at both ends of the capacitor core, the lead-out plugs extend out of the shell through the opening, and a potting material for fixing the capacitor core and the lead-out plugs is potted in the shell, the lower part of the lead-out plugs extends to the side of the capacitor core, and the side edge of the lower part is integrally connected with a plurality of fins arranged at intervals from each other, and the plurality of fins are folded to the outside of the two ends of the capacitor core through a first bend and directly welded to the gold-sprayed surface.

[0005] The purpose of the utility model can also be solved by the following technical measures:

[0006] As a more specific solution, the fin is further provided with a second bend, and a welding section and an L-shaped transition section are bent on the fin through the first bend and the second bend, the L-shaped transition section is spaced apart from the shell, and the welding section is welded on the gold-sprayed surface.

[0007] As a further solution, the L-shaped transition section is provided with a first limiting end surface facing the capacitor core, and the side surface of the capacitor core is abutted against the first limiting end surface.

[0008] As a further solution, a second limiting end surface facing the shell is provided at the lower portion of the lead-out plug, and the second limiting end surface is abutted against the inner wall surface of the shell.

[0009] As a further solution, the plurality of fins are extended in a horizontal direction, and the extension length of each fin is equal and they are arranged parallel to each other.

[0010] As a further solution, the L-shaped transition section includes a first connecting section and a second connecting section, the first connecting section is arranged between the welding section and the second connecting section, the first limiting end face is arranged on the first connecting section, and the welding section is perpendicular to the lead-out plug, and the first connecting section is parallel to the lead-out plug.

[0011] As a further solution, the lead-out plug includes a longitudinally arranged plug body, the top end of the plug body is connected to a transversely arranged lead-out portion, and the lead-out portion extends out of the shell and is directly placed on the edge of the shell.

[0012] As a further solution, the lead-out plug also includes an extension portion connected to the bottom of the plug body, the extension portion is arranged toward the inner side of the plug body, and the plurality of fins are formed by extending from the side of the extension portion toward the outer side of the plug body.

[0013] As a further solution, the fins are welded to the gold-sprayed surface of the capacitor core by a high-frequency spot welding process or a tin soldering process.

[0014] The beneficial effects of the utility model are as follows:

[0015] The utility model discloses a low inductance capacitor. The fins on the lead-out plug-in of the capacitor can be bent at any distance and size according to the size of the capacitor core and the film width required by the user. The fins of the lead-out plug-in are formed by direct stamping and slotting, and can be bent at any position of the mold according to the user's requirements, thereby meeting the different special needs of customers and ensuring any size of the capacitor core. Moreover, by designing 1 to 3 fins, they can be directly welded to the gold-sprayed surface, which can meet the capacitor product pitch requirements and effectively ensure the small stray inductance of the product.

[0016] In addition, the fins are made of both high-frequency spot welding and tin soldering processes, which effectively ensures the weldability of the product and avoids the lead-out welding piece being too large to burn the gold-sprayed surface of the capacitor core, effectively ensuring the product's overcurrent capacity and thermal uniformity of the product end surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic cross-sectional structure diagram of Example 1 of the present utility model.

[0018] Figure 2 This is a schematic diagram of the welding structure of the capacitor core and fins in Example 1 of the utility model.

[0019] Figure 3 This is a schematic diagram of the lead-out plug and fin structure of Example 1 in the utility model.

[0020] Figure 4 It is a schematic diagram of the thickness position of the fins in the utility model.

[0021] Figure 5 This is a structural schematic diagram of Example 2 of the present utility model.

[0022] Figure 6 This is a schematic diagram of the welding structure of the capacitor core and fins in Example 2 of the present utility model.

[0023] Figure 7 This is a schematic diagram of the lead-out plug and fin structure of the second embodiment of the utility model.

[0024] Figure 8 This is a schematic diagram of the fin structure of Example 2 of the present utility model. DETAILED DESCRIPTION

[0025] The utility model is further described below in conjunction with the accompanying drawings and embodiments. Embodiment 1:

[0026] like Figures 1 to 4 As shown, a low inductance capacitor includes a shell 1, an opening 101 is provided on the shell 1, a capacitor core 2 is placed in the shell 1, and lead plugs 4 are respectively welded to the gold-sprayed surfaces 3 at both ends of the capacitor core 2, and the lead plugs 4 extend out of the shell 1 through the opening 101, and a potting material 5 for fixing the capacitor core 2 and the lead plugs 4 is potted in the shell 1, the lower part of the lead plug 4 extends to the side of the capacitor core 2, and the side edge of the lower part thereof is integrally connected with a plurality of fins 6 arranged at intervals from each other, and the plurality of fins 6 are folded to the outside of the two ends of the capacitor core 2 through a first bend 601 and directly welded to the gold-sprayed surface 3.

[0027] The fins 6 on the lead-out plug in this capacitor can be bent at any distance and size according to the size of the capacitor core 2 and the film width required by the user. The fins 6 of the lead-out plug 4 are formed by direct stamping and slotting, and can be bent at any position of the mold according to the user's required pitch, thereby meeting the different special needs of customers and ensuring any size of the capacitor core. In addition, by designing 1 to 3 fins 6 that can be directly welded to the gold-sprayed surface 3, the pitch requirements of the capacitor product can be met, effectively ensuring that the product's stray inductance is small.

[0028] The lower part of the lead-out plug 4 is provided with a second limiting end face 401 facing the housing 1, and the second limiting end face 401 abuts against the inner wall of the housing 1; the lead-out plug 4 directly abuts against the outer wall of the housing 1, thereby playing a limiting role.

[0029] The plurality of fins 6 are extended in the horizontal direction, and each fin 6 has the same extension length and is arranged parallel to each other.

[0030] The lead-out plug 4 includes a plug body 41 disposed longitudinally, a top end of the plug body 41 is connected to a lead-out portion 42 disposed transversely, and the lead-out portion 42 extends out of the housing 1 and is directly placed on the edge of the housing 1 .

[0031] The lead-out plug 4 also includes an extension portion 43 connected to the bottom of the plug body 41, and the extension portion 43 is arranged toward the inner side of the plug body 41. The plurality of fins 6 are extended and formed by the extension portion 43 toward the side of the outer side of the plug body 41; the lead-out plug 4 of this structure makes the fins closer to the gold-sprayed surface 3 of the capacitor core 2, reduces the length of the fins 6, and can reserve more space for the fins 6 to bend.

[0032] The fins 6 are welded to the gold-sprayed surface 3 of the capacitor core 2 by a high-frequency spot welding process or a tin soldering process; the fins 6 use both high-frequency spot welding and tin soldering processes to effectively ensure the weldability of the product, avoid the lead-out welding piece being too large to burn the gold-sprayed surface 3 of the capacitor core 2, and effectively ensure the product's overcurrent capacity and the thermal uniformity of the product end surface.

[0033] In the second embodiment, three fins 6 are connected to the lower part of the lead-out plug 4 .

[0034] The thickness of the fin 6 is H, and 0.2 mm ≤ H ≤ 1.8 mm. In the present embodiment, the thickness H of the fin 6 is preferably around 1 mm. Embodiment 2:

[0035] The structure and principle of the second embodiment are roughly the same as those of the first embodiment, except that: Figures 5 to 8 As shown, the fin 6 is also provided with a second bend 602 , and a welding section 61 and an L-shaped transition section 62 are bent on the fin 6 through the first bend 601 and the second bend 602 , the L-shaped transition section 62 is spaced apart from the shell 1 , and the welding section 61 is welded to the gold-sprayed surface 3 .

[0036] The L-shaped transition section 62 is provided with a first limiting end surface 63 facing the capacitor core 2, and the side surface of the capacitor core 2 is pressed against the first limiting end surface 63;

[0037] By cooperating with the first limiting end face 63 and the second limiting end face 401 , the placement position of the capacitor core 2 can be positioned, so that a stable distance is maintained between the capacitor core 2 and the housing 1 , thereby improving the potting effect of the potting material 5 .

[0038] The L-shaped transition section 62 includes a first connecting section 621 and a second connecting section 622, wherein the first connecting section 621 is arranged between the welding section 61 and the second connecting section 622, the first limiting end surface 63 is arranged on the first connecting section 621, and the welding section 61 is perpendicular to the lead-out plug-in 4, and the first connecting section 621 is parallel to the lead-out plug-in 4.

[0039] The above is a preferred embodiment of the utility model, which shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. The utility model may have various changes and improvements without departing from the spirit and scope of the utility model, and these changes and improvements fall within the scope of the utility model to be protected, and the scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A low inductance capacitor, comprising a housing (1), the housing (1) being provided with an opening (101), a capacitor core (2) being placed in the housing (1), lead plugs (4) being welded to gold-sprayed surfaces (3) at both ends of the capacitor core (2), the lead plugs (4) extending out of the housing (1) through the opening (101), and a potting material (5) for fixing the capacitor core (2) and the lead plugs (4) being potted in the housing (1), characterized in that The lower part of the lead-out plug (4) extends to the side of the capacitor core (2), and the side edge of the lower part is integrally connected with a plurality of fins (6) arranged at intervals from each other, and the plurality of fins (6) are folded to the outside of the two ends of the capacitor core (2) through a first bend (601) and directly welded to the gold-sprayed surface (3).

2. A low inductance capacitor according to claim 1, characterized in that: The fin (6) is also provided with a second bend (602), and a welding section (61) and an L-shaped transition section (62) are bent on the fin (6) through the first bend (601) and the second bend (602), the L-shaped transition section (62) being arranged at a distance from the housing (1), and the welding section (61) being welded to the gold-sprayed surface (3).

3. A low inductance capacitor according to claim 2, characterized in that: The L-shaped transition section (62) is provided with a first limiting end surface (63) facing the capacitor core (2), and the side surface of the capacitor core (2) is abutted against the first limiting end surface (63).

4. A low inductance capacitor according to any one of claims 1 to 3, characterized in that: The lower part of the lead-out plug (4) is provided with a second limiting end surface (401) facing the outer shell (1), and the second limiting end surface (401) is abutted against the inner wall surface of the outer shell (1).

5. A low inductance capacitor according to claim 1, characterized in that The plurality of fins (6) are extended in a horizontal direction, and the extension length of each fin (6) is equal and they are arranged parallel to each other.

6. A low inductance capacitor according to claim 3, characterized in that The L-shaped transition section (62) comprises a first connecting section (621) and a second connecting section (622), the first connecting section (621) being arranged between the welding section (61) and the second connecting section (622), the first limiting end surface (63) being arranged on the first connecting section (621), the welding section (61) being perpendicular to the lead-out plug-in sheet (4), and the first connecting section (621) being parallel to the lead-out plug-in sheet (4).

7. A low inductance capacitor according to claim 1, characterized in that The lead-out plug (4) comprises a plug body (41) arranged longitudinally, the top end of the plug body (41) being connected to a lead-out portion (42) arranged transversely, the lead-out portion (42) extending out of the housing (1) and directly resting on the edge of the housing (1).

8. A low inductance capacitor according to claim 7, characterized in that The lead-out plug (4) further comprises an extension portion (43) connected to the bottom of the plug body (41), the extension portion (43) being arranged towards the inner side of the plug body (41), and the plurality of fins (6) being formed by extending from the extension portion (43) towards the side of the outer side of the plug body (41).

9. A low inductance capacitor according to claim 1, characterized in that The fin (6) is welded to the gold-sprayed surface (3) of the capacitor core (2) by a high-frequency spot welding process or a tin soldering process.

10. A low inductance capacitor according to claim 1, characterized in that The lower part of the lead-out plug (4) is connected to one to four fins (6).

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