JPS6023958Y2 - composite capacitor - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a composite capacitor used in a safety device for a discharge lamp.

Generally, these composite capacitors are used by being housed in the same container as the ballast main body, filling the container with a compound, and fixing the ballast body and the container together.

Conventionally, a composite capacitor used in this manner has a phase advancing capacitor 2 housed in a case 1, as shown in FIG. Filling resin 4 is injected to a certain extent.

Before the filling resin 4 hardens, the starting capacitor 5 and the noise prevention capacitor 6, which have been coated with resin depth, are embedded in the filling resin 4 with their parts exposed.

Next, lead wires 2a, 2b, 5a, 5bt 6a, e led out from the phase advancement capacitor 2, starting capacitor 5, and noise prevention capacitor 6, respectively.
b penetrates into eyelet holes 9at 9b, 9c, and 9d formed by eyelet-equipped lug terminals 8a, 8b, 8c, and 8d attached to the terminal plate 7 as shown in FIG.

In this case, the lead wires 2a, 5a, 6a are connected to the eyelet hole 9a, the lead wire 5b is connected to the eyelet hole 9b, and the lead wire 6b is connected to the eyelet hole 9.
In c, the lead wires 2b are made to penetrate through the eyelet holes 9d, respectively.

Then, the terminal plate 7 is locked and fixed to the opening of the case 1, the excess lead wires protruding from the eyelet holes ga, 9b, 9c, and 9d are cut off, and the solder 10 is attached to complete the product. be.

11 is a compound injection hole.

However, with the above configuration, not only is it not easy to manufacture, that is, fix the terminal board to the case opening, but the composite capacitor configured in this way is housed in the same container as the ballast main body, and the compound capacitor is not easy to manufacture. However, when the compound is filled into the cavity 3 formed in the case 1 through the compound injection hole 11 provided in the terminal plate 7, air voids tend to occur and the cavity 3 cannot be filled. there was.

In particular, ballasts for discharge lamps require heat dissipation conditions because they are used in a high atmosphere of 80 to 90°C, which is 30 to 40°C higher than general equipment.

For example, the thermal conductivity of polyester used as a compound is approximately 2 KCa1/m, h°C, whereas that of air is extremely low at approximately 0.02 KCa1/m, h°C, so air voids are formed in the cavity 3 as in the above structure. When this occurs, the thermal conductivity decreases accordingly, impairing the heat dissipation effect and posing the risk of causing an accident due to thermal runaway.

The present invention was developed in view of the above points, and by improving the terminal board structure and terminal board mounting structure, it is housed in the same container as the ballast body and is filled with compound to cover the surrounding area without air voids. The purpose of this invention is to provide a composite capacitor that can

An embodiment of the present invention will be described below with reference to the drawings.

That is, as shown in FIGS. 3A and 3B, the terminal plate 22 is placed perpendicular to the opening of the case 21 made of synthetic resin such as epoxy, vinyl chloride, or polyester.
The entire phase advance capacitor 24, which is integrally connected to the terminal plate 22 by abutting the step portions 23a and 23b, and a part of the starting capacitor 25 and the noise prevention capacitor 26, which are integrally connected to the terminal plate 22, are described above. It is stored in a resin case 21.

In this case, the terminal board 22 is made of a simple square plate made of an insulating material such as fiber board, press pod, resin, etc., with lug terminals 27a, 27b, 27c, and 27d fixed thereto, as shown in FIG. .

Lead wires 24a, 2 led out from the lug terminals 27a, 27b, 27c, 27d and the phase advance capacitor 24
4b, the lead wires 25a, 25b led out from the starting capacitor 25 and the lead wires 26a, 26b led out from the noise prevention capacitor 26 are connected as specified, and the starting capacitor 25 and the noise prevention capacitor 26 are connected as specified. The capacitor 26 is integrated with the terminal plate 22 with the terminal plate 22 sandwiched therebetween.

Thus, thermosetting filling resin 28 is injected into the cavity of the resin case 21, and the filling resin 28 is cured to fix each part.

The composite capacitor constructed as described above is used by storing it in the same container as the ballast main body and filling it with compound, as described above, but the structure of the terminal 22 is extremely simple, and moreover, compared to the resin case. Since it stands vertically, it does not interfere with the compound coating around the terminal plate 22 placed in the opening of the resin case 21, the starting capacitor 25, and the noise prevention capacitor 26, and there is no risk of air voids occurring and the entire surface can be smoothly covered. Coating can be done.

Furthermore, it is possible to significantly reduce the size of the i-s 21 compared to the conventional one.

Furthermore, the terminal board 22 can be fixed by curing the filling resin 28 without using any special means, and has many advantages.

If it is necessary to position the terminal plate in the center of the case, a case 30 having grooves 29 for holding the terminal plate formed on the side surface as shown in FIGS. 5A and 5B may be used.

In addition, if it is necessary to increase the fixing strength of the terminal board, it is possible to lengthen the part of the terminal board that is embedded in the filling resin, as well as to make holes 32a in the part of the terminal board 31 that is embedded in the filling resin, as shown in FIG. .

32b may be provided.

As described above, according to the present invention, the terminal board is erected perpendicularly to the case opening, the filling resin is cured and fixed together, and the terminal board is housed in the same container as the ballast body and filled with compound. When used in a discharge lamp ballast, it is possible to provide a composite capacitor with stable characteristics that can exhibit stable functions over a long period of time without causing accidents due to thermal runaway.

[Brief explanation of the drawing]

FIG. 1 is a front cross-sectional view showing a conventional composite capacitor, FIG. 2 is a plan view showing a terminal plate that constitutes the composite capacitor shown in FIG. 1, and FIGS. Figure 4 is a perspective view showing the terminal plate constituting the composite capacitor shown in Figures 3A and 3B, and Figures 5A and B are diagrams of the present invention. A case according to another embodiment is shown, and A is a plan view, B is a side view, and FIG. 6 is a perspective view showing a terminal board according to another embodiment of the present invention. 21.30... Case, 22,31...
・Terminal board, 24... Phase advancing capacitor, 25.
...Starting capacitor, 26...Noise prevention capacitor, 2...Filled resin, 29...
...kerf, 32a, 32b...hole.

Claims (3)

[Scope of utility model registration request] (1) A case made of synthetic resin, a phase advance capacitor stored in the inner bottom of the case, and a starting capacitor and a noise prevention capacitor placed above the phase advance capacitor and partially housed in the case. , a terminal plate arranged vertically between the noise prevention capacitor and the starting capacitor and partially housed in the case, a terminal fixed to the terminal plate and connected with lead wires led out from each of the capacitors, and a terminal in the case. A composite capacitor characterized by comprising a filling resin injected into the cavity of the composite capacitor. (2) The composite capacitor according to claim 1, which is a utility model, in which a groove for holding a terminal plate is provided on the side surface of the case. (3) The composite capacitor according to claim 1 or 2 of the utility model registration claim, wherein one or more holes are provided in the portion of the terminal plate that is housed in the case.