A metal-foil capacitor

Abstract

The utility model relates to a kind of metal foil capacitor in the technical field of metal foil capacitor, including capacitor core, capacitor core includes two single edge metallized film, two metal foils and light film, two single edge metallized film all include metal plating and isolation film layer, the isolation film layer of two single edge metallized film all is equipped with link segment, two single edge metallized film are connected by link segment, two single edge metallized film is symmetrically arranged around center, the side of link segment is equipped with embedding gap, the middle part of light film is inlaid between two single edge metallized film by embedding gap, two metal foils are clamped between isolation film layer and light film, capacitor core is wound along link segment as center, the end of two metal foils can avoid the gap existing under conventional structure, prevent the high voltage discharge caused by the gap between the end of two metal foils, to greatly improve the withstand voltage capacity of such capacitor.

Description

Technical Field

[0001] This utility model relates to the technical field of metal foil capacitors, and in particular to a metal foil capacitor. Background Technology

[0002] Although most foil capacitors on the market currently employ a film / foil composite series structure, using metal foil as electrodes and a single-sided metallized film as the internal series connection film, this type of capacitor combines the high-current characteristics of aluminum foil capacitors with the self-healing properties of metallized film capacitors. Its series structure is equivalent to two internal capacitors connected in series, theoretically increasing the capacitor's voltage withstand capability several times over. However, due to the air gap at the ends of the aluminum foil, these capacitors are prone to discharge under high voltage (above 1000VDC). Therefore, there is an urgent need to develop a metal foil capacitor to meet practical application requirements. Utility Model Content

[0003] The purpose of this invention is to provide a metal foil capacitor to solve the above-mentioned defects.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A metal foil capacitor includes a capacitor core, which comprises two single-edge metallized films, two metal foils, and a light film. Each of the two single-edge metallized films includes a metal plating layer and an isolation film layer. The isolation film layers of the two single-edge metallized films are provided with connecting sections. The two single-edge metallized films are connected through the connecting sections. The two single-edge metallized films are arranged in a centrally symmetrical structure. One side of the connecting section is provided with an embedding notch. The center of the light film is embedded between the two single-edge metallized films through the embedding notch. The two metal foils are sandwiched between the isolation film layer and the light film. The capacitor core is wound around the connecting section as the center.

[0005] As a further option, as described above, the thickness of the optical film ranges from 3μm to 20μm.

[0006] In the above description, as a further option, the thickness range of the single-edge metallization film is 3μm-20μm.

[0007] In the above description, as a further embodiment, the thickness of the metal foil is in the range of 4μm-10μm.

[0008] As a further option, the isolation membrane layer is composed of either a metallized polyester film or a metallized polypropylene film, as described above.

[0009] As a further option, as described above, the metal coating may be composed of any one of zinc, silver, and aluminum.

[0010] As a further embodiment, the optical film described above is made of polypropylene film.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: by setting two single-edge metallized films in a centrally symmetrical structure, and embedding a light film at the connection section through an embedded notch, the metal foil is sandwiched between the isolation film layer and the light film, and the capacitor core is wound around the connection section as the center. The ends of the two metal foils can avoid the gaps that exist in conventional structures, preventing high voltage discharge caused by the gap between the ends of the two metal foils, thereby greatly improving the voltage withstand capability of this type of capacitor. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the unfolded state of a metal foil capacitor as described in this embodiment; Figure 2 This is an exploded view of the structure of a metal foil capacitor described in this embodiment; In the figure: 1-Single-edge metallized film, 11-Metal coating, 12-Isolation film layer, 2-Metal foil, 3-Optical film, 4-Embedded notch, 5-Connecting segment. Detailed Implementation

[0013] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0014] For this embodiment, please refer to Figures 1-2 The specific implementation of the metal foil 2 type capacitor includes a capacitor core, which includes two single-edge metallized films 1, two metal foils 2, and a light film 3. Each of the two single-edge metallized films 1 includes a metal plating layer 11 and an isolation film layer 12. The isolation film layer 12 of each of the two single-edge metallized films 1 is provided with a connecting section 5. The two single-edge metallized films 1 are connected through the connecting section 5. The two single-edge metallized films 1 are arranged in a centrally symmetrical structure. An embedding notch 4 is provided on one side of the connecting section 5. The middle part of the light film 3 is embedded between the two single-edge metallized films 1 through the embedding notch 4. The two metal foils 2 are sandwiched between the isolation film layer 12 and the light film 3. The capacitor core is wound around the connecting section 5 as the center.

[0015] The thickness of the optical film 3 ranges from 3μm to 20μm, the thickness of the single-edge metallized film 1 ranges from 3μm to 20μm, the thickness of the metal foil 2 ranges from 4μm to 10μm, the isolation film layer 12 is composed of either a metallized polyester film or a metallized polypropylene film, the metal coating layer 11 is composed of either zinc, silver or aluminum, and the optical film 3 is composed of a polypropylene film.

[0016] This type of capacitor with metal foil 2 has two single-edge metallized films 1 arranged in a centrally symmetrical structure. At the connecting section 5, a light film 3 is embedded through an embedded notch 4, so that the metal foil 2 is sandwiched between the isolation film layer 12 and the light film 3. The capacitor core is wound around the connecting section 5. The ends of the two metal foils 2 can avoid the gaps that exist in conventional structures, preventing high voltage discharge caused by the gap between the ends of the two metal foils 2. This greatly improves the voltage withstand capability of this type of capacitor, while still retaining the self-healing property of the metallized film. It is very suitable for use in high voltage and high current applications, such as electrodeless lamps, mosquito killers and other devices with voltage rise due to the momentum.

[0017] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A metal foil capacitor, comprising a capacitor core, characterized in that: The capacitor core includes two single-edge metallized films, two metal foils, and a light film. Each of the two single-edge metallized films includes a metal plating layer and an isolation film layer. The isolation film layer of each of the two single-edge metallized films is provided with a connecting section. The two single-edge metallized films are connected through the connecting section. The two single-edge metallized films are arranged in a centrally symmetrical structure. One side of the connecting section is provided with an embedding notch. The middle part of the light film is embedded between the two single-edge metallized films through the embedding notch. The two metal foils are sandwiched between the isolation film layer and the light film. The capacitor core is wound around the connecting section as the center.

2. A metal foil capacitor according to claim 1, characterized in that: The thickness of the optical film ranges from 3μm to 20μm.

3. A metal foil capacitor according to claim 1, characterized in that: The thickness range of the single-edge metallization film is 3μm-20μm.

4. A metal foil capacitor according to claim 1, characterized in that: The thickness of the metal foils ranges from 4μm to 10μm.

5. A metal foil capacitor according to claim 1, characterized in that: The isolation membrane layer is composed of either a metallized polyester membrane or a metallized polypropylene membrane.

6. A metal foil capacitor according to claim 1, characterized in that: The metal coating is composed of any one of zinc, silver, and aluminum.

7. A metal foil capacitor according to claim 1, characterized in that: The optical film is made of polypropylene film.

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