Film Capacitors, Link Capacitors, Inverters, and Electric Vehicles

Abstract

The main body (3) of the film capacitor A has a pair of opposing surfaces, and a pair of second side surfaces (3c, 3d) opposing in the first direction x connecting the pair of surfaces. The dielectric film (1) of the main body (3) has an insulating edge portion (6) that is continuous in the first direction x, and the first metal film (2a) and the second metal film (2b) are connected with the insulating edge portion (6) The first slit (8) and the second slit (9) which contact the first end portion (N1) and form an angle of θ1 with the second side surface (3c, 3d) are separated. The second slit (9) is connected to the first slit (8) at a contact point (M). In the first direction x, when the direction from the first end (N1) toward the contact point (M) is defined as a positive direction, the second slit (9) is in the negative direction of the first direction relative to the contact point (M) Has a second end (N2). The first end (N1) of the first slit (8) connected by the second end (N2) to the second slit (9) adjacent to the negative direction in the first direction x is arranged in the first direction x At the same position, or arranged in the negative direction relative to the first end portion (N1), tan (θ1) is not less than 0.15 and not more than 0.35.

Description

technical field [0001] The present disclosure relates to film capacitors, junction capacitors, inverters, and electric vehicles. Background technique [0002] The film capacitor has, for example, a dielectric film obtained by thinning a polypropylene resin, and a metal film formed on the surface of the dielectric film by vapor deposition. Metal films are used as electrodes. With this structure, in the thin film capacitor, when a short circuit occurs in the insulating defect portion of the dielectric thin film, the metal film around the defect portion is evaporated and scattered by the energy of the short circuit, and the insulating defect portion of the dielectric thin film is insulated. Film capacitors have this self-healing property and are less prone to dielectric breakdown. [0003] In this way, it is difficult for the film capacitor to cause fire and electric shock when the circuit is short-circuited. Therefore, in recent years, the use of film capacitors is expandin...

AI Technical Summary

Problems solved by technology

For wound-type film capacitors, if the number of windings increases, the self-healing property tends to decrease near the center of the winding.

In addition, wound-type film capacitors tend to generate unnecessary space when housed in a case

In multilayer film capacitors, it is difficult to cause the reduction in self-healing properties seen in wound film capacitors

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