A multi-string thin film capacitor

Abstract

The application discloses a kind of multi-string film capacitors, including shell, multiple core body, frame, cover plate, frame is received in shell and divides into several containing space in shell, multiple core body one-to-one corresponding adaptation is received in multiple containing space, multiple core body is connected in series after leading out inner wiring terminal respectively with two outer wiring terminals electrically connected on cover plate, cover plate adaptation fixedly covers on the opening of shell and frame and core body are encapsulated in shell, a kind of multi-string film capacitor is proposed in the application, the withstand voltage performance of capacitor is improved by multiple core body connected in series, and the probability of short circuit occurrence can also be reduced;A kind of multi-string film capacitor is proposed in the application, the production assembly efficiency of capacitor is improved;In addition, the first arc spring sheet is arranged to improve the electrical contact area between the core body and the first electrical connector, so that the electrical connection between the core body is more stable.

Description

Technical Field

[0001] This invention relates to the field of capacitor technology, and more particularly to a multi-string thin-film capacitor. Background Technology

[0002] Capacitors, as fundamental electronic components, are widely used in electronic products. Capacitors are classified into different types based on their dielectric material. Currently, polypropylene film capacitors are receiving considerable attention. Polypropylene film capacitors utilize metallized polypropylene film winding, with metal solder sprayed onto the ends, wrapped with polyester tape, and encapsulated with epoxy resin at both ends. They offer advantages such as low loss, light weight, excellent self-healing properties, good temperature characteristics, high reliability, and high precision. However, existing polypropylene film capacitors have poor voltage withstand capability, and the internal core is typically electrically connected to external terminals via soldering, a relatively cumbersome process. Summary of the Invention

[0003] To address the existing technical problems in the background art, this invention proposes a multi-string thin-film capacitor.

[0004] The present invention proposes a multi-series thin-film capacitor, comprising a housing, multiple cores, a frame, and a cover plate. The frame is housed inside the housing and divides the housing into several receiving spaces. The multiple cores are fitted and housed in the multiple receiving spaces one by one. The internal terminals of the multiple cores connected in series are electrically connected to two external terminals mounted on the cover plate. The cover plate is fitted and fixedly closed over the opening of the housing and encapsulates the frame and cores inside the housing.

[0005] Preferably, the device further includes two carrier plates and a first electrical connector. One terminal of each of the multiple cores faces the opening of the housing, and the other terminal of each of the multiple cores faces the inner bottom wall of the housing. Each of the two carrier plates has multiple first slots, and each of the first slots on the two carrier plates is fitted with a first electrical connector. The terminals of two adjacent cores facing the opening are inserted into the first slot of one carrier plate and are in electrical contact with the first electrical connector. The terminals of two adjacent cores facing the inner bottom wall are inserted into the first slot of the other carrier plate and are in electrical contact with the first electrical connector, so as to realize the series connection of the multiple cores.

[0006] Preferably, the first electrical connector has two first arc-shaped spring pieces adapted to the cylindrical terminals on the core, a connecting piece is fixedly installed between the two first arc-shaped spring pieces, and both the first arc-shaped spring pieces and the connecting piece are made of conductive material to electrically connect the two adjacent cores.

[0007] Preferably, two second slots are formed on the two carrier plates, and a second electrical connector is embedded in each of the two second slots. After multiple cores are connected in series, the terminals on the two cores located at the head and tail are inserted into the second slots and make electrical contact with the second electrical connectors. The two second electrical connectors are respectively electrically connected to two external terminals on the cover plate.

[0008] Preferably, the second electrical connector has a second arc-shaped spring that is adapted to the cylindrical terminal of the core. The second arc-shaped spring is made of a conductive material and is electrically connected to the external terminal through a wire.

[0009] Preferably, the first and second arc-shaped springs are made of soft conductive components, the outer rings of the first and second arc-shaped springs are covered with hard pressure plates, and a screw is spirally inserted into the carrier plate, and the screw can abut against the hard pressure plate.

[0010] Preferably, the carrier plate is spirally fitted with fastening bolts, and the frame is provided with threaded holes that are compatible with the fastening bolts.

[0011] Preferably, the shell is filled with high-temperature resistant epoxy resin.

[0012] Preferably, the core is made of aluminum-zinc thickened metallized polypropylene film.

[0013] The multi-series thin-film capacitor proposed in this invention improves the voltage withstand performance of the capacitor by connecting multiple cores in series, while also reducing the probability of short circuits.

[0014] The multi-series film capacitor proposed in this invention allows for direct assembly of multiple cores by attaching the terminals at both ends of two carrier plates, thus completing the series connection of multiple cores without the need for individual welding of each core, thereby improving the production and assembly efficiency of the capacitor. In addition, the first arc-shaped spring can cover the outside of the cylindrical terminal of the core, increasing the electrical contact area. Finally, rotating the screw can press the first arc-shaped spring through the hard pressure plate, making the first arc-shaped spring fit more tightly with the terminal and less prone to separation, thereby improving the stability of the core electrical connection. Attached Figure Description

[0015] Figure 1 This is a front cross-sectional view of the overall structure of a multi-string thin-film capacitor proposed in this invention;

[0016] Figure 2 This is a top cross-sectional view of a multi-string thin-film capacitor proposed in this invention;

[0017] Figure 3 for Figure 2 Enlarged schematic diagram of the structure at point A in the diagram;

[0018] Figure 4 This is a three-dimensional structural diagram of the first electrical connector of a multi-string thin-film capacitor proposed in this invention;

[0019] Figure 5 This is a three-dimensional structural diagram of the second electrical connector of a multi-series thin-film capacitor proposed in this invention. Detailed Implementation

[0020] Reference Figure 1 This embodiment proposes a multi-series thin-film capacitor, comprising a housing 1, multiple cores 2, a frame 3, and a cover plate 4. The frame 3 is housed inside the housing 1 and divides the housing 1 into several accommodating spaces. The multiple cores 2 are fitted one-to-one into the multiple accommodating spaces. The internal terminals of the multiple cores 2 connected in series are electrically connected to two external terminals 9 mounted on the cover plate 4. The cover plate 4 is fitted and fixedly covers the opening of the housing 1 and encapsulates the frame 3 and cores 2 inside the housing 1.

[0021] In this embodiment, the voltage withstand performance of the capacitor is improved by connecting multiple cores 2 in series. When assembling the capacitor, multiple cores 2 connected in series are placed in the storage space of the housing 1.

[0022] Reference Figure 2-4 In a further embodiment, to improve the efficiency of assembling multiple cores 2 in series, two carrier plates 5 and a first electrical connector 6 are also included. One terminal of each of the multiple cores 2 faces the opening of the housing 1, and the other terminal of each of the multiple cores 2 faces the inner bottom wall of the housing 1. Multiple first slots 7 are provided on both carrier plates 5, and the first electrical connector 6 is embedded in the first slots 7 on both carrier plates 5. The terminals of two adjacent cores 2 facing the opening are inserted into the first slot 7 of one carrier plate 5 and are in electrical contact with the first electrical connector 6. The terminals of two adjacent cores 2 facing the inner bottom wall are inserted into the first slot 7 of the other carrier plate 5 and are in electrical contact with the first electrical connector 6, so as to realize the series connection of multiple cores 2.

[0023] In this embodiment, two carrier plates 5 are respectively installed on the two terminals of the core 2. When the two terminals of two adjacent cores 2 are in electrical contact with the first electrical connector 6, the series electrical connection of multiple cores 2 can be completed. It is not necessary to weld multiple cores 2 one by one to connect them in series, thereby improving the assembly efficiency of the capacitor.

[0024] In a further embodiment, in order to increase the electrical contact area between the terminal and the first electrical connector 6, the first electrical connector 6 has two first arc-shaped spring pieces 61 adapted to the cylindrical terminals on the core 2, and a connecting piece 62 is fixedly installed between the two first arc-shaped spring pieces 61. Both the first arc-shaped spring pieces 61 and the connecting piece 62 are made of conductive material to electrically connect the two adjacent cores 2.

[0025] In this embodiment, the cylindrical terminal is inserted into the first arc-shaped spring piece 61 along its axial direction and the two are in contact. The first arc-shaped spring piece 61 covers the cylindrical terminal, increasing the contact area between the terminal and the first arc-shaped spring piece 61.

[0026] When inspecting the capacitor after assembly, if there is poor electrical contact between the cores 2 and the capacitor cannot be used normally, the electrical connection between two adjacent cores 2 can be checked by testing the first electrical connector 6, which is a simpler testing method.

[0027] Reference Figure 5 In a further embodiment, to facilitate the electrical connection between the multiple cores 2 connected in series and the external terminals 9 on the cover plate 4, two second slots 10 are provided on the two carrier plates 5. Each of the two second slots 10 is equipped with a second electrical connector 11. The terminals on the two cores 2 located at the head and tail of the multiple cores 2 connected in series are inserted into the second slots 10 and make electrical contact with the second electrical connector 11. The two second electrical connectors 11 are respectively electrically connected to the two external terminals 9 on the cover plate 4.

[0028] The second electrical connector 11 has a second arc-shaped spring 111 adapted to the cylindrical terminal of the core 2. The second arc-shaped spring 111 is made of conductive material and is electrically connected to the external terminal 9 through a wire.

[0029] In this embodiment, the two second electrical connectors 11 are electrically connected to the external terminals 9 on the cover plate 4. When the carrier plate 5 is installed on the core 2, one of the cylindrical terminals on the two cores 2 located at the head and tail of the series connection is inserted into the second arc-shaped spring piece 111 in the second electrical connector 11, thereby electrically connecting the core 2 and the external terminal 9. It is not necessary to weld wires between the core 2 and the external terminal 9. The assembly method is simple and quick, which improves the production efficiency of the capacitor.

[0030] It should be noted that when the number of cores 2 is odd, the two second grooves 10 are arranged on the two carrier plates 5 respectively, and when the number of cores 2 is even, the two second grooves 10 are arranged on the carrier plate 5 on the side closer to the cover plate 4.

[0031] In order to make the connection between the spring and the terminal more secure and less likely to separate during use, both the first arc-shaped spring 61 and the second arc-shaped spring 111 are made of soft conductive components. The outer ring of the first arc-shaped spring 61 and the second arc-shaped spring 111 is covered with a hard pressure plate 12. A screw 13 is screwed into the carrier plate 5 and the screw 13 can abut against the hard pressure plate 12.

[0032] The carrier plate 5 is spirally fitted with a fastening bolt 8, and the frame 3 is provided with a threaded hole that matches the fastening bolt 8. In order to make the electrical connector and the cylindrical terminal more tightly connected, the fastening bolt 8 is rotated to squeeze the hard pressure plate 12. The hard pressure plate 12 drives the first arc-shaped spring 61 and the second arc-shaped spring 111 to move towards the terminal and fit tightly with the terminal, making it less likely to loosen and separate, thus improving the stability of the electrical connection between the cores 2.

[0033] The housing 1 is filled with high-temperature resistant epoxy resin to improve the sealing performance of the housing 1.

[0034] Core 2 is made of aluminum-zinc thickened metallized polypropylene film.

[0035] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A multi-series thin-film capacitor, characterized in that, include: The shell (1), multiple cores (2), frame (3), and cover plate (4) are arranged in the shell (1) and divide the shell (1) into several storage spaces. Multiple cores (2) are fitted and stored in multiple storage spaces. The internal wiring terminals of the multiple cores (2) connected in series are electrically connected to the two external wiring terminals (9) installed on the cover plate (4). The cover plate (4) is fitted and fixed to the opening of the shell (1) and encapsulates the frame (3) and cores (2) in the shell (1). It also includes two carrier plates (5) and a first electrical connector (6). One terminal of each of the multiple cores (2) faces the opening of the housing (1), and the other terminal of each of the multiple cores (2) faces the inner bottom wall of the housing (1). Multiple first slots (7) are provided on both carrier plates (5). The first electrical connector (6) is embedded in the first slots (7) on both carrier plates (5). The terminals of two adjacent cores (2) facing the opening are inserted into the first slot (7) of one of the carrier plates (5) and are in electrical contact with the first electrical connector (6). The terminals of two adjacent cores (2) facing the inner bottom wall are inserted into the first slot (7) of the other carrier plate (5) and are in electrical contact with the first electrical connector (6), so as to realize the series connection of multiple cores (2).

2. The multi-series thin-film capacitor according to claim 1, characterized in that, The first electrical connector (6) has two first arc-shaped spring pieces (61) adapted to the cylindrical terminals on the core (2), and a connecting piece (62) is fixedly installed between the two first arc-shaped spring pieces (61). Both the first arc-shaped spring pieces (61) and the connecting piece (62) are made of conductive material to electrically connect the two adjacent cores (2).

3. The multi-series thin-film capacitor according to claim 2, characterized in that, Two second slots (10) are opened on the two carrier plates (5). A second electrical connector (11) is embedded in each of the two second slots (10). After multiple cores (2) are connected in series, the terminals on the two cores (2) located at the head and tail are inserted into the second slots (10) and make electrical contact with the second electrical connector (11). The two second electrical connectors (11) are electrically connected to the two external terminals (9) on the cover plate (4) respectively.

4. The multi-series thin-film capacitor according to claim 3, characterized in that, The second electrical connector (11) has a second arc-shaped spring (111) adapted to the cylindrical terminal of the core (2). The second arc-shaped spring (111) is made of conductive material and is electrically connected to the external terminal (9) via a wire.

5. The multi-series thin-film capacitor according to claim 4, characterized in that, The first arc-shaped spring (61) and the second arc-shaped spring (111) are made of soft conductive components. The outer ring of the first arc-shaped spring (61) and the second arc-shaped spring (111) is covered with a hard pressure plate (12). A screw (13) is screwed into the carrier plate (5) and the screw (13) can abut against the hard pressure plate (12).

6. The multi-series thin-film capacitor according to claim 1, characterized in that, The carrier plate (5) is spirally fitted with fastening bolts (8), and the frame (3) is provided with threaded holes that are compatible with the fastening bolts (8).

7. The multi-series thin-film capacitor according to claim 1, characterized in that, The shell (1) is filled with high-temperature resistant epoxy resin.

8. The multi-series thin-film capacitor according to claim 1, characterized in that, The core (2) is made of aluminum-zinc thickened metallized polypropylene film.

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