High-voltage-resistant double-sided metallized film capacitor

Abstract

The utility model discloses a high-voltage-resistant double-sided metallized film capacitor which comprises a first dielectric light film, a double-sided metallized film, a second dielectric light film and a single-sided metallized film which are stacked in sequence. The capacitor is composed of the first dielectric light film, the double-sided metallized film, the second dielectric light film and the single-sided metallized film which are stacked in sequence, the first dielectric light film and the second dielectric light film are double-sided corona films subjected to high-frequency and high-voltage electric treatment, the surface activity of the first dielectric light film and the second dielectric light film is improved, the wetting tension can reach 50 mN / m, and under the action of surface tension adsorption after the first dielectric light film and the second dielectric light film are wound into the capacitor, the dielectric light film is not prone to falling off. All layers of films are tightly attached, so that air residues are reduced, and the failure of the capacitor caused by air gap discharge of a middle reserved edge is avoided; and meanwhile, the combination of the thin film metal layer and the first and second non-evaporation regions forms 2n sub-capacitors in series in the capacitor, so that the voltage endurance capability of the capacitor is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of capacitors, in particular to a high-voltage-resistant double-sided metallized film capacitor. Background Art

[0002] The double-sided metallized film capacitor uses a polypropylene film with excellent high-frequency characteristics as the dielectric, and a double-sided metallized polyester film with high temperature resistance as the electrode. Gold is sprayed on both ends to form a non-inductive structure. Compared with ordinary single-sided film capacitors, it has the characteristics of being able to withstand large currents, high pulses, and low temperature rise. It is widely used in different circuit applications such as high-frequency pulse circuits, resistance-capacitance absorption circuits, high-frequency resonance circuits, and coupling circuits.

[0003] In the prior art, due to the different thermal deformation temperatures and surface activities of the polyester film and the polypropylene film, the two layers of films are not tightly bonded, and a large number of air gaps remain at the middle margin of the polyester film. When the voltage is relatively high, air gap discharge will occur, and the high temperature generated during discharge will cause the capacitor to fail. The existing solution is generally to increase the margin width. However, increasing the margin width will cause the capacitor size to become larger, which is not conducive to the miniaturization of the product. And it is found in use that after the margin is increased, the air gap discharge at the middle margin still exists. The air gap discharge at the middle margin of the double-sided metallized film capacitor has become a pain point in the industry. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a high-voltage-resistant double-sided metallized film capacitor, which solves the problems that due to the different thermal deformation temperatures and surface activities of the polyester film and the polypropylene film, the two layers of films are not tightly bonded, a large number of air gaps remain at the middle margin of the polyester film, when the voltage is relatively high, air gap discharge will occur, and the high temperature generated during discharge will cause the capacitor to fail, and when the margin width is increased, the capacitor size becomes larger while the air gap discharge at the middle margin still exists, so as to overcome the deficiencies of the prior art.

[0005] The utility model provides a high-voltage-resistant double-sided metallized film capacitor through the following technical solutions, which includes a first dielectric optical film, a double-sided metallized film, a second dielectric optical film, and a single-sided metallized film stacked in sequence.

[0006] Further, the double-sided metallized film is a polyester film with vapor-deposited metal layers on both side surfaces, and the sheet resistance of the vapor-deposited metal layer ≤ 2Ω / , and n first non-vapor-deposited areas are symmetrically arranged on both side surfaces of the double-sided metallized film. The first non-vapor-deposited area is perpendicular to the winding direction of the double-sided metallized film, and the width of the first non-vapor-deposited area is 2 - 4 mm.

[0007] Further, the single-sided metallized film is a polypropylene film with a vapor-deposited metal layer on the side surface facing away from the double-sided metallized film, and the sheet resistance of the vapor-deposited metal layer ≤ 2Ω / , on the surface of the vapor-deposited metal layer of the single-sided metallized film, there are n + 1 second non-vapor-deposited areas, which are perpendicular to the winding direction of the single-sided metallized film, and the width of the second non-vapor-deposited area is 2 - 4 mm.

[0008] Further, the first dielectric optical film and the second dielectric optical film are polypropylene films subjected to double-sided corona treatment using high-frequency high-voltage electricity.

[0009] Further, the thickness of the first dielectric optical film is equal to the sum of the thicknesses of the second dielectric optical film and the single-sided metallized film.

[0010] Further, the first dielectric optical film, the second dielectric optical film and the single-sided metallized film have the same width W1, the width of the double-sided metallized film is W2, and W2 - W1 = 2 - 3 mm.

[0011] Further, the materials of the vapor-deposited metal layers of the double-sided metallized film and the single-sided metallized film are aluminum.

[0012] The utility model has the following beneficial effects: It is composed of a first dielectric optical film, a double-sided metallized film, a second dielectric optical film and a single-sided metallized film stacked in sequence. The first and second dielectric optical films are double-sided corona films treated with high-frequency high-voltage electricity, which improves their surface activity, and the wetting tension can reach 50 mN / m. After being wound into a capacitor, under the action of surface tension adsorption, the films are closely attached to each other, reducing air residue and avoiding the failure of the capacitor due to edge air gap discharge in the middle; at the same time, the combination of the thin film metal layer and the first and second non-vapor-deposited areas forms 2n sub-capacitors connected in series inside the capacitor, further improving the withstand voltage ability of the capacitor. Description of the Drawings

[0013] Figure 1 is a schematic structural diagram of a high-voltage-resistant double-sided metallized film capacitor described in the utility model.

[0014] Figure 2 is a schematic diagram of the series connection effect of sub-capacitors of a high-voltage-resistant double-sided metallized film capacitor described in the utility model.

[0015] Among them, Figures 1 to 2 the corresponding relationship between the reference numerals in and the component names is as follows:

[0016] 1 first dielectric optical film, 2 double-sided metallized film, 3 second dielectric optical film, 4 single-sided metallized film, 5 vapor-deposited metal layer, 6 first non-vapor-deposited area, 7 second non-vapor-deposited area. Detailed Embodiment

[0017] Next, the technical solutions of the present application will be clearly and completely described in conjunction with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments.

[0018] The components of the embodiments of the present application that are usually depicted and shown in the accompanying drawings herein can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application claimed, but merely represents selected embodiments of the present application.

[0019] All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts fall within the scope of protection of the present application.

[0020] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present application. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0021] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0022] Next, refer to Figures 1-2 Describe a high-voltage-resistant double-sided metallized film capacitor according to some embodiments of the present application.

[0023] A high-voltage-resistant double-sided metallized film capacitor includes a first dielectric optical film 1, a double-sided metallized film 2, a second dielectric optical film 3, and a single-sided metallized film 4 stacked in sequence.

[0024] Among them, the first dielectric optical film 1 and the second dielectric optical film 3 are high-temperature-resistant polypropylene films, and before manufacturing the capacitor, double-sided corona treatment is performed using high-frequency high-voltage electricity to activate the surfaces of the first dielectric optical film 1 and the second dielectric optical film 3, increase the surface energy, and their wetting tension reaches more than 50 mN / m.

[0025] The double-sided metallized film 2 is a polyester film with vapor-deposited metal layers 5 on both side surfaces. The material of the vapor-deposited metal layer 5 is aluminum, and the sheet resistance of the vapor-deposited metal layer 5 ≤ 2 Ω / , on both side surfaces of the double-sided metallized film 2, n first non-evaporated regions 6 are symmetrically arranged at the same time. The first non-evaporated regions 6 are perpendicular to the winding direction of the double-sided metallized film 2, and the width of the first non-evaporated regions 6 is 2-4 mm.

[0026] The single-sided metallized film 4 is also a polypropylene film. On the side surface facing away from the double-sided metallized film 2, it has an evaporated metal layer 5. The material of the evaporated metal layer 5 is also aluminum, and the sheet resistance of the evaporated metal layer 5 ≤ 2 Ω / , on the surface where the evaporated metal layer 5 of the single-sided metallized film 4 is located, n + 1 second non-evaporated regions 7 are provided. The second non-evaporated regions 7 are perpendicular to the winding direction of the single-sided metallized film 4, and the width of the second non-evaporated regions 7 is 2-4 mm.

[0027] The thickness of the first dielectric optical film 1 is equal to the sum of the thicknesses of the second dielectric optical film 3 and the single-sided metallized film 4.

[0028] After winding the first dielectric optical film 1, the double-sided metallized film 2, the second dielectric optical film 3, and the single-sided metallized film 4 stacked as above into a capacitor, due to the relatively high surface tension of the first dielectric optical film 1 and the second dielectric optical film 3, the effect of close adhesion of each layer of film is improved, greatly reducing the air residue between the films and avoiding the failure of the capacitor due to discharge in the middle and edge air gaps.

[0029] The combination of the evaporated metal layer 5 on the double-sided metallized film 2 and the single-sided metallized film 4 and the first non-evaporated regions 6 and the second non-evaporated regions 7 forms 2n sub-capacitors in series inside the capacitor, further improving the voltage withstand capacity of the capacitor.

[0030] As shown in the appendix Figure 2 In this embodiment, as shown, there are 3 first non-evaporated regions 6 on the double-sided metallized film 2, and 4 second non-evaporated regions 7 on the single-sided metallized film 4, forming 6 series sub-capacitors, further improving the voltage withstand capacity of the capacitor.

[0031] The first dielectric optical film 1, the second dielectric optical film 3, and the single-sided metallized film 4 have the same width W1, the width of the double-sided metallized film 2 is W2, and W2 - W1 = 2-3 mm. The remaining width of the double-sided metallized film 2 is convenient for circuit connection.

[0032] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A double-sided metallized film capacitor with high voltage resistance, which is characterized in that, It includes a first dielectric optical film, a double-sided metallized film, a second dielectric optical film, and a single-sided metallized film that are stacked in sequence. The first dielectric optical film and the second dielectric optical film are polypropylene films that are subjected to double-sided corona treatment using high-frequency high-voltage electricity.

2. The high-voltage-resistant double-sided metallized film capacitor according to claim 1, wherein The double-sided metallized film is a polyester film with vapor-deposited metal layers on both surfaces, and the surface resistance of the vapor-deposited metal layer is ≤ 2 Ω / , and n first non-vapor-deposited areas are symmetrically arranged on both surfaces of the double-sided metallized film. The first non-vapor-deposited areas are perpendicular to the winding direction of the double-sided metallized film, and the width of the first non-vapor-deposited area is 2-4 mm.

3. A high-voltage resistant double-sided metallized film capacitor according to claim 2, characterized in that, The single-sided metallized film is a polypropylene film with a vapor-deposited metal layer on the surface facing away from the double-sided metallized film, and the sheet resistance of the vapor-deposited metal layer is ≤ 2 Ω / , and n + 1 second non-vapor-deposited areas are provided on the surface where the vapor-deposited metal layer of the single-sided metallized film is located. The second non-vapor-deposited areas are perpendicular to the winding direction of the single-sided metallized film, and the width of the second non-vapor-deposited areas is 2-4 mm.

4. A high-voltage resistant double-sided metallized film capacitor according to any one of claims 1-3, characterized in that, The thickness of the first dielectric optical film is equal to the sum of the thicknesses of the second dielectric optical film and the single-sided metallized film.

5. A high-voltage resistant double-sided metallized film capacitor according to any one of claims 1-3, characterized in that, The first dielectric optical film, the second dielectric optical film, and the single-sided metallized film have the same width W1, and the width of the double-sided metallized film is W2, where W2 - W1 = 2 - 3 mm.

6. A high-voltage resistant double-sided metallized film capacitor according to any one of claims 2-3, characterized in that The evaporated metal layer materials of the double-sided metallized film and the single-sided metallized film are aluminum.

Images