JPH046201Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a high-voltage magnetic capacitor used for high voltages of several kV to several tens of kV.

<Conventional technology> Conventionally, this type of high-voltage porcelain capacitor
For example, as shown in FIG. 5, capacitor electrodes 2, 2 are formed on both main surfaces of a disc-shaped ceramic body 1 serving as a dielectric, and lead terminals 5, 5 (see FIG. (not shown) is known.

<Problems to be Solved by the Invention> Generally speaking, such high-voltage porcelain capacitors inevitably generate heat due to their own Q when energized. In the case of the above conventional example, heat is dissipated relatively quickly in the periphery of the ceramic body 1 due to the self-heating of the capacitor, but the amount of heat dissipated becomes smaller as it approaches the center. Therefore, the properties of the dielectric material may change due to internal heat accumulation, or thermal internal distortion may occur in the ceramic body 1, which may eventually cause thermal breakdown. Regarding this point, when the electronic device is installed in a high-temperature environment such as around a power supply section, the above-mentioned problem becomes even more pronounced due to the influence of the ambient temperature.

In view of these conventional problems, the present invention aims to improve the heat dissipation efficiency of the capacitor itself and avoid as much as possible the thermal effects caused by self-heating when energized.

<Means for solving the problem> In order to achieve this purpose, this invention
The feature is that a hole for heat radiation is provided in the center of the porcelain body.

<Example> Hereinafter, the present invention will be described in detail based on an example shown in the drawings.

FIG. 1 is a perspective view of this embodiment, FIG. 2 is a front view thereof, and FIG. 3 is a sectional view taken along the cutting line - in FIG. 2. In these figures, reference numeral 1 indicates a ceramic body serving as a dielectric. Capacitor electrodes 2, 2, which are capacitor electrodes, are formed entirely on both main surfaces of this ceramic body 1, respectively. The porcelain body 1 is formed into a disk shape, and has a concentric heat dissipation through hole 4 provided in the center thereof, and has a so-called donut shape as a whole. Bent ends 5a, 5a of lead terminals 5, 5 are soldered onto the capacitor electrodes 2, 2, respectively. The lead terminals 5, 5 are drawn out from each capacitor electrode 2, 2, and are connected to, for example, a circuit board (not shown). The high voltage porcelain capacitor of this embodiment constructed in this way is coated with a resin material 6 on the outside.

In Fig. 2, the self-heating of the capacitor when energized is radiated from the outer circumference of the ceramic body 1, and is radiated from the heat radiation hole 4 near the center, which affects the capacitor characteristics as a whole. This means that a portion of heat storage that is as high as this will not occur.

In the above embodiment, only one large-diameter through hole is provided in the center of the porcelain body 1 as the heat dissipation hole 4, but the present invention is not limited to this. For example, as shown in FIG. As shown, various embodiments are possible, such as one in which a plurality of small holes 4a are formed radially through the center of the porcelain body 1. In addition, the heat radiation hole 4
You can also aim for the same effect by making it a blind hole.

<Effects of the invention> As described above, according to the invention, a through hole for heat radiation is provided in the center portion of the porcelain body. Therefore, the temperature rise of the capacitor itself due to self-heating of the capacitor can be suppressed, and deterioration of characteristics and thermal destruction due to heat can be prevented. Furthermore, when the high-voltage porcelain capacitor according to the present invention is used near the power supply section of an electronic device, the cooling air from the power supply section not only flows around the outside surface of the capacitor, but also goes around the inside of the heat radiation hole, and flows from both the inside and outside of the capacitor. Since it is cooled, it is particularly advantageous when incorporated into such a part, and the range of practical use can be expanded.

[Brief explanation of the drawing]

1 to 4 show embodiments of the present invention,
Fig. 1 is a perspective view of this embodiment, Fig. 2 is a partially cutaway front view thereof, and Fig. 3 is a section line in Fig. 2.
FIG. 4 is a front view of a porcelain body of another embodiment, and FIG. 5 is a perspective view of a conventional porcelain body. 1...Porcelain element body, 2...Capacitor electrode, 4...
...Holes for heat radiation.

Claims (1)

[Scope of utility model registration request] A high-voltage porcelain capacitor comprising a porcelain body and capacitor electrodes facing each other formed on both main surfaces of the porcelain body, the high-voltage porcelain capacitor having a hole for heat dissipation provided in a central portion of the porcelain body.