JPS6242522Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to the improvement of multilayer film capacitors. When the above-mentioned capacitor has a short-circuit failure, the electrical connection with other circuits is severed due to the heat generated by the failure. The feature is that it does not affect the functions of circuits and parts.

First, a conventional capacitor of this type will be explained.

FIG. 1 is a diagram showing a conventional multilayer film capacitor. In the figure, 1 indicates a multilayer film, in which a is a dielectric film, b and c are metal thin films,
2 is an electrode, and 3 is a lead wire.

Conventional multilayer capacitors are constructed as described above, so that in the multilayer film 1, the capacitor is composed of the metal thin film b and the other metal thin film c, which are laminated with the dielectric material a in between. They are connected in parallel by electrodes 2 and electrically connected to other components and circuits by lead wires 3.
For this reason, there is a drawback that when the dielectric insulation of the laminated portion deteriorates and a short circuit occurs, other components or circuits may fail and be short-circuited by the capacitor.

This invention was made in order to improve such conventional drawbacks, and the connection between the metal thin film of the laminated film capacitor and the electrode is made using a material that melts or breaks due to heat (for example, a fuse), and the electrode is If the material that connects the metal thin film and the electrode melts or breaks, applying a force that causes it to be electrically disconnected from the metal thin film, and causing a short-circuit failure of the multilayer film capacitor, the resulting heat may cause the bonding material to melt or break. By melting, the electrodes are separated from the metal thin film, and this multilayer film capacitor is electrically separated from other parts and circuits, so a short circuit failure of the multilayer film capacitor can affect the functions of other parts and circuits. It was designed so that

Figure 2 shows an example of this invention.
a to b are the same as in FIG. 1, 4 is a bonding material, and 5 is a spring.

In FIG. 2, the bonding material 4 is a material that melts or breaks due to heat, so if a short-circuit failure occurs in the multilayer film capacitor 1 and heat is generated, the pushing force of the spring 5 will cause the electrode 2 to become a metal thin film. b, and electrically isolated from other parts and circuits.

As explained above, this invention can electrically disconnect a laminated film capacitor that has caused a short-circuit failure from other parts or circuits, and is particularly suitable as a laminated film capacitor for a capacitor bank in an electric propulsion vehicle. For example, it is effective when applied to space-related equipment.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a conventional laminated film capacitor, and FIG. 2 is a diagram showing an example of a laminated film capacitor according to this invention. In the figure, 1 is a laminated film, a is a dielectric film, and b and c are metals. 2 is a thin film, 2 is an electrode, 3 is a lead wire, 4 is a bonding material, and 5 is a spring. It should be noted that the same or corresponding parts in the figures are indicated by the same reference numerals.

Claims (1)

[Scope of utility model registration request] In a laminated film capacitor in which an insulating thin film and a metal thin film are laminated, the electrodes provided on both end faces of the laminated film capacitor and the metal thin film are connected with a material that melts or breaks due to heat generation in the event of a short-circuit failure of the capacitor, and A multilayer film capacitor characterized in that a spring is provided between the electrodes for mechanically separating the metal thin film and the electrodes.