JPS593565Y2 - Denkai capacitor - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an electrolytic compound whose purpose is to significantly reduce high frequency impedance.

A conventional electrolytic compound was constructed as shown in FIG.

That is, an anode foil and a cathode foil are wound in a metal case 1 with a separator in between, and a capacitor element 2 impregnated with an electrolyte is fixed thereto via a compound 3, and an anode lead 4 drawn out from this compound element 2 is wound. and cathode lead 5
The anode terminal 7 of the sealing plate 6 sealed to the opening of the case 1
, and are configured to be electrically connected to the cathode terminal 8.

In recent years, electrolytic compounds have also been used in various power supply circuits, and with the development of these power supply circuits, the frequencies used have also increased to about 10 to 50 KHz.

Electrolytic capacitors used in power supply circuits that handle such high frequencies are required to have low impedance in the high frequency range.

However, the above-mentioned conventional electrolytic compounds have the disadvantage that their impedance is high in the high frequency range, and a sufficient filtering effect cannot be obtained, so that they cannot be used in power supply circuits that handle high frequencies.

For this reason, recently, anode foils for capacitor elements,
Although the structure was designed to reduce the inductance component by drawing out a large number of lead wires from the cathode foil, its performance was not sufficient at around 50 KHz.

That is, the reduction in the inductance component of the capacitor element itself is considerably improved even with the multi-lead structure, but it is still not sufficient.

The present invention eliminates the above-mentioned conventional drawbacks.

The present invention will be explained below with reference to FIGS. 2 to 6 of the drawings of one embodiment.

First, in FIG. 2, 9 is a case made of metal such as aluminum, and inside this case 9 is a compound 10.
Two capacitor elements 11 and 12 are housed through the capacitor.

Note that there may be two or more capacitor elements.

This compound element 11.12 is constructed by winding an anode foil and a cathode foil made of etched aluminum foil with a separator in between, and impregnating this with an electrolyte. lead 1
3, 14. Two cathode leads 15, 16 are drawn out.

A sealing plate 17 is sealed to the opening of the case 9, and two anode terminals 18.19 and two cathode terminals 20.21 are fixed to the sealing plate 17.
The cathode terminals 20 and 21 are electrically connected to each other by shorters 22 and 23 made of conductive metal.

The shorteners 22 and 23 may be provided only on the inside as shown in FIG. 2, or may be provided on the inside and outside of the sealing plate 17 as shown in FIG. 5, or as shown in FIG. Batten 1
It may be provided outside of 7.

When provided on the outside as shown in FIG. 5, a plurality of internal terminals are drawn out from the shortper 22, 23 according to the number of elements.

And the anode lead 13. of the capacitor element 11.12.
14 is electrically connected to the shorter 22 on the anode side or the internal terminal of the shorter 22 at different locations, and the cathode leads 15 and 16 are connected to the shorter 23 on the cathode side or the internal terminal of the shorter 23. electrically connected at different locations.

The equivalent circuit diagram of the electrolytic capacitor constructed in this manner is shown in FIG. 3, where C is the capacitance and L is the inductance of the short circuit.

By configuring as described above, the series inductance can be reduced, and the impedance characteristic becomes as shown in FIG. 6 compared to an electrolytic capacitor having a multi-lead structure.

In FIG. 6, A shows the characteristics of the conventional example, and B shows the characteristics of the present invention, and the electrolytic capacitors used here were both 25V and 33,000 μF.

In this way, even in the high frequency range, the electrolytic capacitor of the present invention can have a low impedance and has a sufficient filter effect, making it fully usable for power supply circuits that handle high frequencies, and has practical value. It is a great thing.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a conventional electrolytic capacitor, Fig. 2 is a sectional view showing an embodiment of the electrolytic capacitor of the present invention, Fig. 3 is an electrical equivalent circuit diagram of the same capacitor, Figs. 6 is a side view showing an example of the sealing plate used in the same capacitor.
The figure is an impedance characteristic diagram of the conventional electrolytic capacitor and the electrolytic capacitor of the present invention. 9...Case, 11.12...Capacitor element, 13°14...Anode lead, 15.
16... Cathode lead, 17... Sealing plate, 18.19... Anode terminal, 20.21...
...Cathode terminal, 22, 23...Short bar

Claims (1)

[Scope of utility model registration request] Multiple compound elements are housed in a case, multiple anode terminals and cathode terminals are provided on a sealing plate sealed to the opening of the case, and the anode terminals and cathode terminals are connected to each other with short bars. An electrolytic capacitor configured such that a plurality of anode leads and cathode leads drawn out from the capacitor element are connected to terminals on the same pole side through this short bar.