JPH01310528A - Capacitor of voltage doubler circuit - Google Patents

Abstract

PURPOSE:To contrive accomplishment of simplification of connection, saving of space and reduction in cost by a method wherein a liquid-tight insulated tank is housed in a case, and the elements for specific capacitors are housed inside and outside the insulated tank respectively. CONSTITUTION:A liquid-tight insulated tank 2 is housed in a case, the element of a capacitor C1 is housed in either of the inside and the outside of the insulated tank 2, and the element of a capacitor C2 and the element of a capacitor C3 are housed in the other side. Accordingly, the isolation between the capacitor C2 and the capacitor C3, on which cathodes are connected with each other, is unnecessary and a tank 2 with which the capacitor C1 only is isolated from others. As a result, connection is simplified, the space is saved and low cost can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an aluminum foil dry electrolytic capacitor used in a smoothing capacitor circuit that obtains a DC voltage doubler from an AC power source via a rectifier circuit.

[Conventional technology]

FIG. 2 shows a well-known and general example of such a smoothing capacitor circuit. A capacitor C1 smoothes the positive half-wave of the AC voltage of the AC type i1'Xei through the rectifying elements D1 and D2, and a capacitor C2 smoothes the negative half-wave.
A capacitor C3 is connected in parallel to both ends of the series-connected capacitor C3. Aluminum foil type dry electrolytic capacitors are used for capacitors C1, C2, and C3, respectively.

[Problem to be solved by the invention]

In the conventional technology described above, each of the capacitors C5, C2, and C1 is an independent component housed in its own case, and a total of six terminals are connected by lead wires as shown in the circuit diagram. Therefore, the trouble of connection and the space for three capacitors are required, and the price is also high.

The object of the invention is to simplify the connection of three capacitors, save space and obtain a low-cost electrolytic capacitor.

[Means for Solving the Problems] The present invention provides an aluminum structure in which a capacitor C3 is connected in parallel to both ends of a series connection of a capacitor C7 for smoothing the positive half-wave of an AC voltage and a capacitor C2 for smoothing the negative half-wave. In a foil-type dry electrolytic capacitor, one liquid-tight insulating tank is housed in one case, the element of the capacitor C5 is housed inside or outside of this insulating tank, and the element of the capacitor C5 is housed in the other side. The element of the capacitor C2 and the element of the capacitor C3 are housed therein.

[Effect]

In aluminum foil type dry electrolytic capacitors, the electrolyte impregnated in the electrode separator paper generally oozes out from the element. Therefore, in order for each capacitor element to be completely independent, if three elements are housed in one case, each element must be isolated from each other to avoid conduction between the elements due to leaking electrolyte. There is a need. However, in a circuit like Figure 2,
There is no need for isolation between C2 and 03, whose cathodes are connected to each other, and only tank 2 is required to isolate C1 from the others.

〔Example〕

FIG. 1 is a cross-sectional view schematically showing a capacitor according to an embodiment, which is used in the smoothing capacitor circuit shown in FIG. An insulating tank 2 made of plastic or the like is housed in a metal case 1 on the outermost periphery, and a capacitor element C1 for smoothing the positive half wave of the alternating current voltage is housed in the tank 2. Outside tank 2 and inside case l, there is a capacitor element C2 that smoothes the negative half wave.
A capacitor element C3 connected in parallel is housed at both ends of the series connection of C1 and C2. The tank 2 is a cylinder with a bottom, and after housing the element cl, the upper part is also sealed to make it liquid-tight.

Elements C0, C2, and C3 are all made into dielectrics by chemically treating aluminum foil, which serves as an anode, to form an oxide film, like the elements of known electrolytic capacitors.
One to three sheets of electrode separator paper impregnated with a paste electrolyte are adhered to this oxide film to form a true cathode, and an aluminum foil is further adhered to this as an apparent cathode for current collection. . A cylindrical element is formed by layering insulating paper on top of this and then rolling it. The cathode of element C6 and the anode of element C2 are connected by a conductor (not shown) that passes through tank 2 in case 1, and this terminal is a terminal that connects the negative electrodes of C2 and C3 and the anodes of CI and 03. and is pulled out of the case.

In such a structure, in an aluminum foil type dry electrolytic capacitor, the electrolytic solution impregnated in the electrode separator paper generally oozes out from the element to some extent. Therefore, in order for each capacitor element to be completely independent, if three elements are housed in one case, each element must be isolated from each other to avoid conduction between the elements due to leaking electrolyte. There is a need. However, in the circuit as shown in FIG. 2, there is no need for isolation between C2 and 03, whose cathodes are connected to each other, and only tank 2 is required to isolate C1 from the others.

In addition, in FIG. 1, the element C1 may be placed outside the tank 2, and other elements may be placed inside.

〔Effect of the invention〕

The present invention provides an aluminum foil dry electrolytic capacitor in which a capacitor C1 for smoothing the positive half wave of an AC voltage and a capacitor C2 for smoothing the negative half wave are connected in series and a capacitor C3 is connected in parallel at both ends. One liquid-tight insulating tank is housed in a case, the element of the capacitor c1 is housed in either the inside or the outside of this insulating tank, and the element of the capacitor c2 and the capacitor C3 are housed in the other side. Since the elements are housed in one case, the three elements that make up the smoothing capacitor circuit can be housed in one case, and one tank can be placed in that case.
All you need to do is attach them individually, the connection is easy, the three elements become one part, which saves space, and there is only one tank, which lowers the price.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view of the embodiment, and FIG. 2 is a general circuit diagram. ei...AC power supply, C+, Cz...rectifier element. Figure 1 Figure 2

Claims (1)

[Claims] 1) In an aluminum foil dry electrolytic capacitor in which a capacitor C_1 for smoothing the positive half-wave of AC voltage and a capacitor C_2 for smoothing the negative half-wave are connected in series and a capacitor C_3 is connected in parallel at both ends, one One liquid-tight insulating tank is housed in the case, the element of the capacitor C_1 is housed on either the inside or the outside of this insulating tank, and the element of the capacitor C_2 and the element of the capacitor C_3 are housed on the other side. A voltage doubler circuit capacitor characterized by the ability to accommodate