JPH0427152Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a composite capacitor in which an X capacitor and two Y capacitors are connected in delta. The present invention relates to a composite capacitor that is compact and provides excellent frequency characteristics by integrating the two Y capacitors, and also has uniform characteristics of two Y capacitors.

[Conventional technology]

Conventionally, when constructing a line filter that removes high frequency noise applied to electronic equipment etc. using capacitors, an X capacitor 2 and two Y capacitors 4 and 5 are connected in a delta, as shown in Fig. 3. This is usually constructed by incorporating a single capacitor into a printed circuit board. The X capacitor 2 connected between the lines is a metalized film capacitor element due to frequency characteristics, etc., and the Y capacitors 4 and 5 connected between the lines are
A ceramic capacitor element with high withstand voltage is used.

[The problem that the idea aims to solve]

However, when a line filter is constructed from the single capacitor mentioned above, its shape becomes large, requiring a large installation space, and the number of parts increases, increasing manufacturing costs. Moreover, the wiring to connect the capacitor becomes long. Therefore, there is a problem that the inductance increases and the resonant frequency decreases.

Conventionally, on the other hand, two electrodes that are insulated and separated from each other are provided on one surface of a single ceramic substrate, and a common electrode that partially faces the two electrodes is provided on the other surface of the ceramic substrate. A composite capacitor has been proposed in which two Y capacitors are integrally formed and an X capacitor is connected to the two Y capacitors. According to this, since the line filter can be constructed from one composite capacitor, various effects such as space saving, cost reduction, and improvement in frequency characteristics can be obtained.

However, in the case of the above-mentioned composite capacitor, since the two Y capacitors are formed on a single ceramic substrate, the insulation voltage between the Y capacitors is low, making it unreliable for high voltage applications, and the board area is too large. Due to the large size, distortion may occur locally due to moldability, and the characteristics of the two Y capacitors may become non-uniform.

This invention was devised in view of the above points,
The object of the present invention is to realize a composite capacitor that is small and can be manufactured at low cost, has excellent frequency characteristics, and is highly reliable even for high voltage applications, and in which the characteristics of two Y capacitors are uniform.

[Means to solve the problem]

As a result of various studies to achieve the above objectives,
The present invention was completed by configuring the two Y capacitors as independent capacitors and integrating the three capacitors.

Therefore, in the composite capacitor of the present invention, an X capacitor is formed by a metallized film capacitor element provided with a first external electrode and a second external electrode, and a first external electrode is provided on a first dielectric substrate. A first Y capacitor is formed by providing an electrode and a second electrode, and a third electrode and a fourth electrode are provided on the second dielectric substrate.
providing an electrode to form a second Y capacitor;
The first Y capacitor and the second Y capacitor are fixed to one insulating substrate, and the first external electrode and the first electrode, the second electrode and the third electrode, and the fourth and a second external electrode are respectively connected to form a delta connection between the X capacitor, the first Y capacitor, and the second Y capacitor, and these are housed in one exterior body. It is.

[Effect]

Since the present invention has the above-mentioned configuration, it is compact due to integration, the number of component parts is reduced, and the wiring between capacitors is shortened to reduce inductance and prevent a drop in resonance frequency. be done. Moreover, since the two Y capacitors are formed on separate dielectric substrates, the dielectric strength is improved, and furthermore, since the area of the dielectric substrate of each Y capacitor is reduced, there is no possibility of local distortion occurring.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

[Example 1] Fig. 1 shows a composite capacitor according to an embodiment of the present invention, in which Fig. 1A is a perspective view of the main part, Fig. 1B is a schematic longitudinal sectional view, and Fig. 1C is a schematic longitudinal sectional view. is a schematic cross-sectional view. In the figure, a composite capacitor 1 is constructed by laminating and winding a metallized film 21 formed by depositing an electrode metal such as aluminum or zinc on a dielectric film made of synthetic resin such as polyester or polypropylene or capacitor paper. Furthermore, a first external electrode 22 and a second external electrode 23 each made of metallicon are provided at both ends to form a metallized film capacitor element, which is connected to the X capacitor 2.
It is said that Further, a first Y capacitor 4 and a second Y capacitor 5 are fixed to one insulating substrate 3, and the X capacitor 2 and the two Y capacitors 4 and 5 are connected in delta. Further, the first external electrode 22 of the X capacitor 2, the connection portion between the first Y capacitor 4 and the second Y capacitor 5, and the X
A first external terminal 61, a second external terminal 62, and a third external terminal 63 are connected to the second external electrode 23 of the capacitor 2 by soldering, welding, etc. It is housed in an exterior case 7 made of synthetic resin such as tart, polybutylene tereftate, or polycarbonate, and has an integrated structure by filling and hardening a filler 8 such as epoxy resin or polyurethane resin. .

The first Y capacitor 4 has a first dielectric substrate 4 made of a dielectric material with high withstand voltage, such as synthetic resin such as polyethylene or fluororesin, or ceramic.
A first electrode 42 and a second electrode 43 are formed by fixing a metal material such as silver, silver palladium, nickel, or zinc to one end and the other end of the electrode 1 by coating, vapor deposition, plating, or the like. The above 2nd
The Y capacitor 5 has a third electrode 52 and a fourth electrode 53 formed at one end and the other end of a second dielectric substrate 51 made of the same material, respectively.

On one surface of the insulating substrate 3, there is a portion corresponding to the first electrode 42 of the first Y capacitor 4, a second electrode 43 of the first Y capacitor 4, and a third portion of the second Y capacitor 5. A first conductive pattern 31, a second conductive pattern 32, and a third conductive pattern are provided at a portion corresponding to the connection portion with the electrode 52 and a portion corresponding to the fourth electrode 53 of the second Y capacitor 5, respectively. 33 is formed, the first electrode 42 is connected to the first conductive pattern 31, the second electrode 43 and the third electrode 52 are connected to the second conductive pattern 32, and the fourth electrode 53 is connected to the third conductive pattern 32. The first Y capacitor 4 and the second Y capacitor 5 are fixed to the insulating substrate 3 by connecting them to the conductive patterns 33 by soldering or the like. Further, an X capacitor 2 is arranged on the other side of the insulating substrate 3,
The first external electrode 22 and the second external electrode 23 of the X capacitor 2, the first electrode 42 of the first Y capacitor, and the fourth electrode 5 of the second Y capacitor
3 are connected to each other via a first lead wire 91 and a second lead wire 92, respectively.

With the above configuration, the X capacitor 2, the first Y capacitor 4, and the second Y capacitor 5 shown in FIG. external terminal 61 and the second
and the second external terminal 62 and the third external terminal 63 for delta connection.

[Embodiment 2] FIG. 2 is a schematic cross-sectional view of another embodiment of the present invention. In this embodiment, the X capacitor 2 is directly connected to the insulating substrate 3 to further reduce the size. That is, an insulating substrate 3 has a first Y capacitor 4 and a second Y capacitor 5 fixed to one surface.
A fourth conductive pattern 34 and a fifth conductive pattern 35 are formed on the other surface, and these are connected to the first conductive pattern 31 and the third conductive pattern 33, respectively. Place the X capacitor 2 on the surface, and
The external electrode 22 and the second external electrode 23 are connected to the fourth conductive pattern 34 and the fifth conductive pattern 35 of the insulating substrate 3, respectively, by soldering,
This is covered with an exterior body 7 made of synthetic resin such as epoxy.

Further, the first electrode 42 and the second electrode 43 of the first Y capacitor 4 are connected to the first dielectric substrate 4.
The third electrode 52 and the fourth electrode 53 of the second Y capacitor 5 are respectively formed in a portion extending from one end to one surface and a portion extending from the other end to the other surface of the second Y capacitor 5.
are formed in a portion extending from one end of the second dielectric substrate 51 to one surface and a portion extending from the other end to the other surface. This electrode configuration is suitable when it is necessary to increase the capacitance of the Y capacitor because the electrode area can be increased.

Note that the configuration of this embodiment other than the above-mentioned configuration is the same as that of the first embodiment.

[Effect of idea]

As detailed above, the composite capacitor of the present invention is
Since the X capacitor and two Y capacitors are integrated, it can be manufactured compactly and inexpensively, and the frequency characteristics are improved, and since the two independent Y capacitors are fixed to an insulating substrate and integrated,
The dielectric strength between the two Y capacitors has been improved and high reliability can be obtained even when used in high voltage circuits.
This has great practical value, as local distortion of the dielectric substrate does not occur and the characteristics of the two Y capacitors become uniform.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the present invention, in which FIG. 1A is a perspective view of the main part, FIG. 1B is a schematic vertical sectional view,
FIG. 1C is a schematic cross-sectional view, FIG. 2 is a schematic cross-sectional view of another embodiment of the present invention, and FIG. 3 is a circuit diagram of a line filter using a capacitor. 1...Composite capacitor, 2...X capacitor,
21...Metalized film, 22...First external electrode, 23...Second external electrode, 3...Insulating substrate,
31...First conductive pattern, 32...Second conductive pattern, 33...Third conductive pattern, 34
... Fourth conductive pattern, 35 ... Fifth conductive pattern, 4 ... First Y capacitor, 41 ... First dielectric substrate, 42 ... First electrode, 43 ...
Second electrode, 5... Second Y capacitor, 51...
...Second dielectric substrate, 52...Third electrode, 53
...Fourth electrode, 7... Exterior body, 91... First lead wire, 92... Second lead wire.

Claims (1)

[Claims for Utility Model Registration] (1) An X capacitor is formed by a metallized film capacitor element provided with a first external electrode and a second external electrode, and a second external electrode is provided on a first dielectric substrate. A first Y capacitor is formed by providing a first electrode and a second electrode, and a third electrode and a fourth electrode are provided on a second dielectric substrate to form a second Y capacitor.
A capacitor is formed, and the first Y capacitor and the second Y capacitor are fixed to one insulating substrate, and the first external electrode and the first electrode, and the second electrode and the second Y capacitor are fixed to one insulating substrate. The X capacitor, the first Y capacitor, and the second Y capacitor are connected in delta by connecting the third electrode, the fourth electrode, and the second external electrode, respectively, and storing them in one exterior body. A composite capacitor characterized by: (2) A first electrode and a second electrode are formed at one end and the other end of the first dielectric substrate, respectively, and a third electrode and a fourth electrode are formed at one end and the other end of the second dielectric substrate. 2. The composite capacitor according to claim 1, wherein each of the composite capacitors is formed as a composite capacitor. (3) A first electrode and a second electrode are respectively formed in a portion extending from one end of the first dielectric substrate to one surface and a portion extending from the other end to the other surface, and a third electrode and a fourth electrode are formed. 2. The composite capacitor according to claim 1, wherein the composite capacitor is formed in a portion extending from one end of the second dielectric substrate to one surface and a portion extending from the other end to the other surface. (4) A first conductive pattern and a second conductive pattern are provided on one surface of the insulating substrate at a portion corresponding to the connecting portion between the first electrode, the second electrode and the third electrode, and the fourth electrode, respectively. A conductive pattern and a third conductive pattern are formed, and the first electrode and the first conductive pattern, the second electrode and the third electrode and the second conductive pattern are formed.
4. The composite capacitor according to claim 1, wherein the conductive pattern and the fourth electrode are directly connected to the third conductive pattern. (5) Claims 1, 2, and 3, characterized in that the first external electrode and the first electrode and the second external electrode and the fourth electrode are connected via lead wires, respectively.
or the composite capacitor described in 4. (6) forming a fourth conductive pattern connected to the first conductive pattern and a fifth conductive pattern connected to the third conductive pattern on the other surface of the insulating substrate; 5. The composite capacitor according to claim 4, wherein an X capacitor is mounted, and the first external electrode and the fourth conductive pattern are directly connected to each other, and the second external electrode and the fifth conductive pattern are directly connected to each other. (7) The composite capacitor according to claim 1, 2, 3, 4, 5 or 6, wherein the dielectric substrate is made of ceramic. (8) The composite capacitor according to claim 1, 2, 3, 4, 5 or 6, wherein the dielectric substrate is made of synthetic resin.