Miniaturized ultra-low noise thin film capacitor special for electric tool

Abstract

The utility model discloses a special miniaturized ultra-low noise thin film capacitor for an electric tool, which comprises a thin film capacitor main body formed by a base material and a dielectric layer, the dielectric layer is laid on one surface of the base material, the dielectric layer comprises a gold wire and dielectrics which are sequentially arranged in a corner-to-corner manner, and the gold wire separates two adjacent dielectrics and is communicated with the dielectrics on the two sides. The thin-film capacitor solves the problems that in the prior art, a thin-film capacitor is large in working noise and short in service life.

Description

Technical Field

[0001] The utility model relates to the field of thin film capacitors, and particularly to a miniaturized and ultra-low noise thin film capacitor specially used for power tools. Background Art

[0002] A thin film capacitor is a capacitor with a structure in which metal foils are used as electrodes, and are overlapped at both ends with plastic films such as polyethylene terephthalate, polypropylene, polystyrene or polycarbonate, and then wound into a cylindrical shape. It is mainly applied to multiple industries such as electronics, household appliances, communication, electric power, electrified railways, hybrid electric vehicles, wind power generation, and solar power generation.

[0003] At present, there are various power tools with thin film capacitors inside on the market. In such thin film capacitors, a traditional side-by-side parallel dielectric arrangement structure (the edges of the dielectrics are parallel and close to each other) is adopted. When the power tool runs at high speed, resonance (harmonic resonance) is likely to occur, increasing the working noise (mainly whistling and thermal noise), and the resulting strong vibration shortens the service life of the capacitor elements.

[0004] In view of this, the technical solution of the present invention proposes a miniaturized and ultra-low noise thin film capacitor specially used for power tools. It adopts the method of separating the dielectrics at intervals, and pulls the distances between the edges of two adjacent dielectrics farther apart, and adopts a corner-to-corner arrangement form, effectively reducing the generation of running noise. It is a thin film capacitor with a simple structure, a long service life, and good heat dissipation performance. Summary of the Utility Model

[0005] The technical solution of the present invention aims to solve at least one of the technical problems in the related technologies to some extent. Therefore, the main purpose of the present invention is to provide a miniaturized and ultra-low noise thin film capacitor specially used for power tools, aiming to solve the problems of relatively large working noise and short service life of the thin film capacitor in the existing technology.

[0006] To achieve the above purpose, the present invention provides a miniaturized and ultra-low noise thin film capacitor specially used for power tools, including a thin film capacitor main body composed of a base material and a dielectric layer.

[0007] The dielectric layer is laid on one side of the base material.

[0008] The dielectric layer includes gold wires and dielectrics arranged in a corner-to-corner manner in sequence. The gold wires separate two adjacent dielectrics and are connected to the dielectrics on both sides.

[0009] As a further scheme of the present invention, the dielectric is in a rectangular structure and is placed in a rhombus state by rotating on the base material.

[0010] As a further solution of the present utility model, an epoxy resin layer is further coated on the surface of the gold wire and the dielectric.

[0011] As a further solution of the present utility model, the thin film capacitor body further includes a metal foil on the other side of the base material and an electrolytic film on one side of the dielectric layer. An external resin film is provided on the outer layer of the metal foil, and the metal foil and the base material are adhered through an adhesion layer.

[0012] As a further solution of the present utility model, the external resin film is a high-temperature epoxy resin film structure.

[0013] As a further solution of the present utility model, the height of the gold wire on the base material is 0.5 - 0.8 mm higher than that of the dielectric.

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

[0015] The dedicated small-sized and ultra-low-noise thin film capacitor for power tools proposed by the present utility model adopts capacitance separation and arranges the dielectrics in a diagonal-to-diagonal form, minimizing the resonance influence between the dielectrics, thereby achieving the characteristic of low noise. Moreover, increasing the distance between the dielectrics reduces the mutual influence of the working heat between the dielectrics, and the internal heat accumulation is reduced. The overall structure of this thin film capacitor is simple, easy to assemble and use, works stably, and has a long service life. Description of the Drawings

[0016] In order to more clearly illustrate the embodiments of the technical solutions of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the technical solutions of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0017] Figure 1 It is a schematic diagram of the structure settings of the base material and each coating layer of the thin film capacitor body in the present utility model.

[0018] Figure 2 It is a schematic diagram of the arrangement of the dielectrics and the gold wire in the present utility model.

[0019] Figure 3 It is a schematic diagram of the epoxy resin layer provided outside the gold wire and the dielectric in the present utility model.

[0020] Figure 4 It is a schematic diagram of the internal dielectric arrangement of a thin film capacitor with relatively high noise in the prior art.

[0021]

Explanation of the Reference Numerals of the Main Components / Components

[0022] Label Name Label Name 1 Film capacitor body 121 Gold wire 10 Base material 122 Epoxy resin layer 11 Adhesive layer 13 Electrolytic membrane 12 Dielectric layer 14 Metal foil 120 Dielectric 15 External resin film Detailed implementation manners

[0023] are as follows:

[0024] Please refer to the attached Figure 1-4 ,

[0025] The main structure includes a thin-film capacitor body 1 composed of a base material 10 and a dielectric layer 12. The dielectric layer 12 is laid on one side of the base material 10. The dielectric layer 12 includes a gold wire 121 and dielectrics 120 arranged in a corner-to-corner manner in sequence. The gold wire 121 separates two adjacent dielectrics 120 and is connected to the dielectrics 120 on both sides.

[0026] The working principle is as follows:

[0027] The dielectrics 120 on the base material 10 are designed in a corner-to-corner arrangement structure to reduce the influence between two adjacent dielectrics 120. The dielectrics 120 are also separated by the gold wire 121 and are only connected to the gold wire 121 through the "corners" protruding from both sides of the dielectrics 120. The gold wire 121 not only plays a connecting role but also has an isolating effect. The dielectrics 120 can be of a conventional rectangular structure. After rotating the dielectrics 120 on the base material 10 by a certain angle to become a "rhombus", the dielectrics 120 can be arranged in a corner-to-corner manner on the left, right, top, and bottom. During operation, since the closest parts of two adjacent dielectrics 120 are the "corner" parts, most of the structure of the dielectrics 120 has little influence (heat, resonance), and there is also a gold wire 121 between two adjacent dielectrics 120, and the gold wire 121 further isolates, further improving the noise reduction effect.

[0028] A preferred embodiment of the present utility model: The dielectric 120 is of a rectangular structure and is rotated on the base material 10 to be in a rhombus placement state.

[0029] The dielectric 120 is a conventional conductive element with a rectangular shape in the middle. Therefore, this solution can achieve noise reduction and heat dissipation characteristics without changing the structure of the dielectric 120 itself and without adding a separate complex structure.

[0030] A preferred embodiment of the present utility model: The surfaces of the gold wire 121 and the dielectric 120 are also coated with an epoxy resin layer 122.

[0031] The epoxy resin layer 122 coated on the outside of the gold wire 121 and the dielectric 120 has the characteristics of preventing high-temperature deformation and corrosion resistance, and can provide a certain degree of magnetic shielding protection for the internal gold wire 121 and dielectric 120.

[0032] A preferred embodiment of the present utility model: The thin-film capacitor body 1 further includes a metal foil 14 on the other side of the base material 10 and an electrolytic film 13 on one side of the dielectric layer 12. An external resin film 15 is provided on the outer layer of the metal foil 14, and the metal foil 14 and the base material 10 are adhered through an adhesion layer 11. The external resin film 15 is of a high-temperature epoxy resin film structure.

[0033] During final assembly, the external resin film 15 is wound inward and finally forms a protective film for the thin-film capacitor on the outside, which has the characteristics of impact resistance and corrosion resistance.

[0034] A preferred embodiment of the present utility model: The height of the gold wire 121 on the base material 10 is 0.5 - 0.8 mm higher than that of the dielectric 1200.

[0035] To further improve the isolation effect, the dielectric 120 is "submerged" in the planes of the gold wires 121 on both sides.

[0036] The above are only the preferred embodiments of the technical solution of the present utility model, and do not limit the patent scope of the technical solution of the present utility model. Any equivalent structural transformation made under the inventive concept of the technical solution of the present utility model by using the description and drawings of the technical solution of the present utility model, or any direct / indirect application in other related technical fields, is included in the patent protection scope of the technical solution of the present utility model.

Claims

1. A film capacitor dedicated to miniaturization and ultra-low noise of power tools, characterized in that, It includes a thin-film capacitor body composed of a base material and a dielectric layer, The dielectric layer is laid on one side of the base material, The dielectric layer includes a gold wire and dielectrics arranged diagonally in sequence. The gold wire separates two adjacent dielectrics and communicates with the dielectrics on both sides.

2. The miniaturized and ultra-low-noise film capacitor dedicated to power tools according to claim 1, wherein The dielectric is in a rectangular structure and is placed in a rhombic state by rotating on the base material.

3. The miniaturized ultra-low noise film capacitor dedicated to power tools according to claim 1, characterized in that, An epoxy resin layer is also coated on the surfaces of the gold wire and the dielectric.

4. The miniaturized ultra-low noise film capacitor dedicated to power tools according to claim 1, characterized in that, The thin-film capacitor body further includes a metal foil on the other side of the base material and an electrolytic film on one side of the dielectric layer. An external resin film is provided on the outer layer of the metal foil, and the metal foil is adhered to the base material through an adhesive layer.

5. The miniaturized ultra-low noise film capacitor dedicated to power tools according to claim 4, characterized in that, The external resin film is a high-temperature epoxy resin film structure.

6. The miniaturized and ultra-low noise film capacitor dedicated to power tools according to claim 1, characterized in that, The height of the gold wire on the base material is 0.5 - 0.8 mm higher than that of the dielectric.

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