WO2010026808A1

WO2010026808A1 - Decoupling device and assembly

Info

Publication number: WO2010026808A1
Application number: PCT/JP2009/059843
Authority: WO
Inventors: 一也二木; 一善村田
Original assignee: 三洋電機株式会社
Priority date: 2008-09-04
Filing date: 2009-05-29
Publication date: 2010-03-11
Also published as: JPWO2010026808A1

Abstract

The issue is to provide a decoupling device that can send a large DC current to a power supply line and eliminate high‑frequency current from the power supply line. The decoupling device has first and second capacitor elements (11, 12), a pair of positive pole terminals (21, 22), a negative pole terminal (23), and a transmission member (3). The first and second capacitor elements (11, 12) are solid‑state electrolytic capacitors, and positive pole parts (102, 102) thereof are electrically insulated from each other. The transmission member (3) is a plate‑shaped member for realizing conduction between the pair of positive pole terminals (21, 22) outside the first and second capacitor elements (11, 12), and the positive pole parts (102, 102) of the two capacitor elements are connected. The transmission member (3) is disposed along the surface of the two capacitor elements and has a constricted part (34), the width of which is narrower than the other areas of said transmission member (3) in the area extending between the positive pole parts (102, 102) of the two capacitor elements.

Description

Decoupling device and mounting body

The present invention relates to a decoupling device capable of removing noise generated from a load circuit such as a CPU, and a mounting body on which the decoupling device is mounted.

Conventionally, a load circuit such as a CPU (Central Processing Unit) and a power supply circuit for supplying a direct current to the load circuit are connected via a power supply line formed on a circuit board, and a capacitor is connected to a power supply. Connected between line and ground. When a load change occurs in the load circuit, the capacitor functions as a storage battery and supplies electric charge to the load circuit. When a high frequency current (noise) is generated by driving the load circuit, the capacitor functions as a noise filter and removes the high frequency current by guiding the high frequency current from the power supply line to the ground. The above function is called power supply decoupling.

Conventionally, a two-terminal capacitor has been used as the capacitor. However, as the operating speed of the load circuit increases and the circuit becomes more complex, the high-frequency current band shifts to the high-frequency side and widens, and the two-terminal capacitor efficiently removes the high-frequency current. It was becoming difficult.

Therefore, it has been proposed to use a three-terminal capacitor (decoupling device) having a small equivalent series inductance (ESL) instead of the capacitor. For example, Patent Document 1 listed below proposes a solid electrolytic capacitor having a three-terminal structure. The fixed electrolytic capacitor includes a pair of anode terminals that are electrically connected to each other and a cathode terminal, and a dielectric layer is interposed between the pair of anode terminals and the cathode terminal.

Such a three-terminal capacitor is connected to the power supply line as follows. That is, between the load circuit and the power supply circuit, one end of the power supply line extending from the load circuit toward the power supply circuit and one end of the power supply line extending from the power supply circuit toward the load circuit have a three-terminal structure. A pair of anode terminals provided with a capacitor are connected. One cathode terminal is connected to the ground. Thus, a direct current can be supplied to the load circuit by the power supply circuit, and the solid electric field capacitor functions as a noise filter between the power supply line and the ground.
JP 2004-80773 A

However, with a conventional three-terminal capacitor, it is difficult to pass a large direct current through the power line. This is because, for example, as disclosed in Patent Document 1, a direct current flowing between a pair of anode terminals passes through a conductive portion existing inside the solid electrolytic capacitor, but the electrical resistance of the conductive portion is high. . For this reason, it is difficult to cope with an increase in the operating speed of the load circuit.

Further, in the conventional three-terminal structure capacitor, the conductive portion having a high electric resistance generates heat, which may cause destruction of the capacitor itself and further destruction of components arranged around the capacitor.

An object of the present invention is to provide a decoupling device capable of flowing a direct current having a large amount of current through a power supply line and removing high-frequency current from the power supply line.

A decoupling device according to the present invention includes a first capacitor element (11), a second capacitor element (12), a pair of anode terminals (21, 22), a cathode terminal (23), and a transmission member (3). With. The first capacitor element includes an anode part (102), a cathode part (105), and a dielectric layer (103) interposed between the anode part and the cathode part. The second capacitor element includes an anode part (102) electrically insulated from an anode part of the first capacitor element, a cathode part (105), and a dielectric interposed between the anode part and the cathode part. Layer (103). The cathode terminal is connected to the cathode portions of the first and second capacitor elements. The transmission member conducts between the pair of anode terminals outside the first and second capacitor elements, and the anode portions of the first and second capacitor elements are connected. The transmission member is plate-shaped and is disposed along the surfaces of the first and second capacitor elements, and extends between the anode portions of the first and second capacitor elements (3a). Further, it has a constricted portion (34) that is narrower than the other region (3b) of the transmission member.

According to the decoupling device, the direct current flowing between the pair of anode terminals passes through the transmission member outside the first and second capacitor elements without passing through the anode portions of the first and second capacitor elements. Therefore, it is possible to pass a larger direct current than the conventional decoupling device. Further, by providing the constricted portion in the transmission member, the inductance of the transmission member is increased in a portion existing between the anode portions of the first and second capacitor elements. As a result, the high-frequency current flowing into the decoupling device from the pair of anode terminals is easily guided toward the first or second capacitor element. Therefore, the high frequency current can be removed from the power supply line by connecting the first and second anode terminals to two separated power supply lines and connecting the cathode terminal to the ground. That is, the decoupling device functions as a noise filter.

In a specific aspect of the decoupling device, an inductance of a portion of the transmission member (3) existing between the anode portions (102, 102) of the first and second capacitor elements (11, 12) is , Greater than the equivalent series inductance of each of the first and second capacitor elements.

According to the specific embodiment, the high-frequency current flowing into the decoupling device from the pair of anode terminals is guided toward the first or second capacitor element having an inductance smaller than that of the transmission member. Therefore, the function as a noise filter of the decoupling device is enhanced.

In another specific aspect of the decoupling device, the anode parts (102, 102) of the first and second capacitor elements (11, 12) are the pair of anode terminals of the transmission member (3). It is connected to the part existing between (21, 22).

According to the specific aspect, the high-frequency current flowing into the decoupling device from the pair of anode terminals is easily guided toward the first or second capacitor element.

In another specific aspect of the decoupling device, each of the first and second capacitor elements (11, 12) includes an anode body (101) in which the anode portion (102) is protruded, and the anode An oxide film that covers the surface of the body and constitutes the dielectric layer (103), an electrolyte layer (104) that is formed on the surface of the oxide film, and a cathode part (105 that is formed on the surface of the electrolyte layer) And a cathode layer constituting the solid electrolytic capacitor. The anode parts of the first and second capacitor elements are electrically insulated from each other by the oxide film.

According to the above specific embodiment, since the solid electrolytic capacitor has a small equivalent series resistance (ESR), the function as a noise filter of the decoupling device can be enhanced. The anode parts (102, 102) of the first and second capacitor elements (11, 12) are electrically insulated from each other by a resin layer (4) covering the first and second capacitor elements. Also good.

In the specific embodiment, the transmission member (3) includes a first facing portion (31), a second facing portion (32), and a third facing portion (33). The first facing portion contacts the anode portion (102) of the first capacitor element (11) and faces the region (11a) where the anode portion projects from the surface of the first capacitor element. To do. The second facing portion contacts the anode portion of the second capacitor element (12) and faces a region (12a) of the surface of the second capacitor where the anode portion protrudes. The third facing portion extends between the first and second facing portions and is connected to the first and second facing portions and faces at least a part of the surface of the first or second capacitor element. And the said narrow part (34) is formed in the said 3rd opposing part.

This increases the inductance of the third facing portion. Therefore, the inductance of the transmission member is increased in a portion existing between the anode portions of the first and second capacitor elements. Moreover, since the transmission member can be disposed along the first and second capacitor elements, the decoupling device can be reduced in size.

In the specific embodiment, the first and second capacitor elements (11, 12) are opposite to each other in the protruding direction (91, 92) of the anode part (102, 102) from the anode body (101, 101). It may be arranged in the direction along the protruding direction. Thereby, the length of the part which exists between the anode parts of the 1st and 2nd capacitor elements among transmission members becomes large, and, thereby, the inductance of this part becomes large. Therefore, the high-frequency current that has flowed into the decoupling device from the pair of anode terminals is likely to flow to the first or second capacitor element. That is, the function of the decoupling device as a noise filter is enhanced.

In the specific embodiment, the first and second capacitor elements (11, 12) are opposite to each other in the protruding direction (91, 92) of the anode part (102, 102) from the anode body (101, 101). It may be aligned along a direction (93) perpendicular to the protruding direction. Alternatively, the first and second capacitor elements (11, 12) may have the protruding direction (91, 92) of the anode portion (102, 102) from the anode body (101, 101) oriented in the same direction. Good.

In another specific aspect of the decoupling device, the decoupling device further includes a resin layer (4) covering the first and second capacitor elements (11, 12), and the transmission member (3) is formed of the resin layer. Exposed on the surface.

According to the specific aspect, the heat generated in the transmission member can be released efficiently. Therefore, it is possible to prevent the decoupling device from being destroyed due to heat generation of the transmission member.

In another specific aspect of the decoupling device, the cathode terminal (23) is a single terminal connected to the cathode portions (105, 105) of the first and second capacitor elements (11, 12). It is.

According to the specific aspect, a decoupling device having a three-terminal structure including a pair of anode terminals and one cathode terminal can be obtained.

A mounting body according to the present invention includes the decoupling device (80), a load circuit (81), a power supply circuit (82) for supplying a direct current to the load circuit, and a circuit board (83). A ring device, a load circuit, and a power supply circuit are mounted on a circuit board. The circuit board includes a first power line (841), a second power line (842), and a ground line. The first power supply line is connected to the load circuit and extends from the load circuit toward the power supply circuit. The power supply circuit is connected to the second power supply line, and extends from the power supply circuit toward the load circuit. The ground line is connected to the ground. The pair of anode terminals (21, 22) of the decoupling device (80) is connected to one end of the first power supply line and one end of the second power supply line between the load circuit and the power supply circuit. The cathode terminal (23) is connected to the ground line (851).

According to the present invention, it becomes possible to flow a direct current having a large amount of current through the power supply line and to remove high-frequency current from the power supply line.

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.

1. About Decoupling Device As shown in FIGS. 1 to 4, the decoupling device according to the embodiment of the present invention includes a first capacitor element 11, a second capacitor element 12, a pair of

anode terminals

21 and 22, and a cathode terminal. 23, the transmission member 3, and the resin layer 4.

<First and second capacitor elements>
Each of the first and

second capacitor elements

11 and 12 is a solid electrolytic capacitor, and includes an anode body 101, an anode portion 102, a dielectric layer 103, an electrolyte layer 104, and a cathode portion 105, as shown in FIG. Yes. The anode body 101 is composed of a porous sintered body made of a metal having a valve action. As the metal having a valve action, for example, tantalum, niobium, titanium, aluminum or the like is used.

The anode part 102 is constituted by an anode wire protruding from the anode body 101. Specifically, the anode wire constituting the anode portion 102 is formed on the anode body 101 with one end portion 102a protruding from the anode body 101 and the other end portion 102b buried in the anode body 101. Deployed. The anode wire is made of the same kind of metal as that of the anode body 101 and is electrically connected to the anode body 101.

The dielectric layer 103 is composed of an oxide film formed by oxidizing the surface of the anode body 101. Specifically, the oxide film constituting the dielectric layer 103 is formed by immersing the anode body 101 in an electrolytic solution such as an aqueous phosphoric acid solution and electrochemically oxidizing the surface of the anode body 101 (anodic oxidation). The

The electrolyte layer 104 is formed on the surface of the dielectric layer 103. The electrolyte layer 104 is made of a conductive inorganic material such as manganese dioxide, a conductive organic material such as a TCNQ (Tetracyano-quinodimethane) complex salt, or a conductive polymer.

The cathode portion 105 is constituted by a cathode layer formed on the surface of the electrolyte layer 104. Specifically, the cathode layer constituting the cathode portion 105 is composed of a carbon layer formed on the surface of the electrolyte layer 14 and a silver paste layer formed on the surface of the carbon layer, and is electrically connected to the electrolyte layer 14. It is connected to the.

In the first and

second capacitor elements

11 and 12 described above, it can be understood that the dielectric layer 103 is interposed between the anode portion 102 and the cathode portion 105.

The

anode parts

102 and 102 of the first and

second capacitor elements

11 and 12 are electrically insulated from each other. Specifically,

dielectric layers

103 and 103 constituting the first and

second capacitor elements

11 and 12 are interposed between the

anode portions

102 and 102, as shown in FIG. That is, the

anode portions

102 and 102 of the first and

second capacitor elements

11 and 12 are electrically insulated from each other by the dielectric layer 103.

In the decoupling device according to the present embodiment, the first and

second capacitor elements

11 and 12 are arranged as follows. That is, as shown in FIG. 4, the first and

second capacitor elements

11, 12 direct the protruding

directions

91, 92 of the

anode portions

102, 102 from the

respective anode bodies

101, 101 in opposite directions, They are arranged along a direction 93 perpendicular to the protruding direction 91.

<Resin layer>
As shown in FIG. 2, the resin layer 4 has the first and second capacitors in a state where the

end portions

102 a and 102 a of the first and

second capacitor elements

11 and 12 are exposed on the surface of the resin layer 4. The periphery of the

elements

11 and 12 is covered. This increases the overall strength of the decoupling device. Therefore, even if an impact is applied to the decoupling device, the first and

second capacitor elements

11 and 12 are not easily broken. In addition, the resin layer 4 is comprised by resin materials, such as an epoxy resin, for example.

The resin layer 4 is disposed between the transmission member 3 and the first and

second capacitor elements

11 and 12 in a state in which the transmission member 3 described later is covered from above with respect to the first and

second capacitor elements

11 and 12. It is formed by injecting a resin material.

In the decoupling device according to the present embodiment, the resin layer 4 is interposed between the first and

second capacitor elements

11 and 12 as shown in FIG. Therefore, it can be understood that the

anode portions

102 and 102 of the first and

second capacitor elements

11 and 12 are electrically insulated from each other by the resin layer 4.

<A pair of anode terminal and cathode terminal>
The pair of

anode terminals

21 and 22 are arranged in a state of being exposed from the resin layer 4 on the bottom surface 1a of the decoupling device as shown in FIG. Thereby, a pair of

anode terminals

21 and 22 can be connected to the outside. Specifically, it is possible to connect to first and second power supply lines 841 and 842 (see FIG. 9) described later.

Specifically, the pair of

anode terminals

21 and 22 extend along the edge of the bottom surface 1a while facing each other. More specifically, one anode terminal 21 extends along the edge 1 b located in the protruding direction 91 of the anode portion 102 of the first capacitor element 11, and the other anode terminal 22 is the second capacitor element 12. It extends to the edge 1c located in the protruding direction 92 of the anode portion 102 of the first electrode 102.

As shown in FIG. 6, the cathode terminal 23 is a single terminal connected to both the

cathode portions

105 and 105 of the first and

second capacitor elements

11 and 12. As shown in FIG. 3, the cathode terminal 23 is disposed on the bottom surface 1 a of the decoupling device so as to be exposed on the surface of the resin layer 4, and a pair of anode terminals 23 are disposed at a position between the pair of

anode terminals

21 and 22. It is deployed in a state of being electrically insulated from the

anode terminals

21 and 22.

That is, the decoupling device according to the present embodiment is a device having a three-terminal structure including a pair of

anode terminals

21 and 22 and one cathode terminal 23.

<Transmission member>
As shown in FIG. 1, the transmission member 3 conducts between the pair of

anode terminals

21 and 22 outside the first and

second capacitor elements

11 and 12, and the first and

second capacitor elements

11 and 12. The anode part 102 is connected. Further, in the decoupling device according to the present embodiment, the transmission member 3 is provided in a state of being exposed on the surface of the resin layer 4.

Specifically, the transmission member 3 is a plate-shaped metal plate, and is configured by a first facing portion 31, a second facing portion 32, and a third facing portion 33, as shown in FIGS. Yes. In the transmission member according to the present embodiment, a copper plate is employed as the metal plate constituting the transmission member 3.

The first facing portion 31 faces the region 11 a of the surface of the first capacitor element 11 where the anode portion 102 protrudes, and the lower end portion 311 is connected to one anode terminal 21. The second facing portion 32 faces the region 12 a where the anode portion 102 projects from the surface of the second capacitor element 12, and the lower end portion 321 is connected to the other anode terminal 22.

The third facing portion 33 extends between the first and second facing

portions

31 and 32 and is connected to the first and second facing

portions

31 and 32. Thereby, the transmission member 3 conducts between the pair of

anode terminals

21 and 22. The third facing portion 33 faces at least a part of the surfaces of the first and

second capacitor elements

11 and 12. In the decoupling device according to the present embodiment, the third facing portion 33 faces the

upper surfaces

11 b and 12 b of the first and

second capacitor elements

11 and 12.

As shown in FIGS. 1 and 4, the first and second facing

portions

31 and 32 have cuts 31 a for contacting the

anode portions

102 and 102 of the first and

second capacitor elements

11 and 12, respectively. , 32a are formed. The

cuts

31a and 32a extend from the

lower end portions

311 and 321 of the first and second facing

portions

31 and 32 toward the third facing portion 33, respectively.

As shown in FIG. 4, by covering the first and

second capacitor elements

11 and 12 with the transmission member 3 from above, the

anode portions

102 and 102 of the first and

second capacitor elements

11 and 12 are respectively The

cuts

31a and 32a enter from the

lower end portions

311 and 321 side and come into contact with the first and second opposing

portions

31 and 32 at the closed ends 31b and 32b of the

cuts

31a and 32a. As a result, the

anode portions

102 and 102 of the first and

second capacitor elements

11 and 12 are connected to a portion of the transmission member 3 existing between the pair of

anode terminals

21 and 22 as shown in FIG. Is done.

According to the transmission member 3 having the above-described shape, the transmission member 3 can be disposed along the first and

second capacitor elements

11 and 12, so that the decoupling device can be reduced in size.

As shown in FIGS. 4 and 7, the transmission member 3 is in a region 3 a extending between the

anode portions

102, 102 of the first and

second capacitor elements

11, 12 than in the other region 3 b of the transmission member 3. A narrow portion 34 having a narrow width W1 is provided. In the decoupling device according to the present embodiment, the constricted portion 34 is formed in the third facing portion 33, and the first and second capacitor elements 11,
12 extends straight along the

upper surface

11b, 12b (see FIG. 4) with a uniform width W1.

The decoupling device described above can be represented by an equivalent circuit shown in FIG. That is, the equivalent circuit includes coils L1 to L3 representing the inductance of the transmission member 3, the capacitors C11 and L11 representing the capacitance and equivalent series inductance of the first capacitor element 11, and the capacitance of the second capacitor element 12. And a capacitor C12 representing an equivalent series inductance and a coil L12. The coils L1 to L3 are connected in series between the pair of

anode terminals

21 and 22. The capacitor C11 and the coil L11 are connected in series between the connection portion 301 of the coils L1 and L2 and the cathode terminal 23. The capacitor C12 and the coil L12 are connected in series between the connection portion 302 of the coils L2 and L3 and the cathode terminal 23.

The coil L1 represents the inductance of the portion of the transmission member 3 that exists between the anode portion 102 and the anode terminal 21 of the first capacitor element 11. The coil L2 represents the inductance of a portion of the transmission member 3 that exists between the anode portions 102 of the first and

second capacitor elements

11 and 12. The coil L <b> 3 represents the inductance of a portion of the transmission member 3 that exists between the anode portion 102 and the anode terminal 22 of the second capacitor element 12.

2. As shown in FIG. 9, the mounting body on which the decoupling device is mounted includes a load circuit 81 such as a CPU and a power supply circuit 82 that supplies a direct current to the load circuit 81. And a circuit board 83. In FIG. 9, the decoupling device is denoted by reference numeral 80.

The circuit board 83 has a four-layer structure, and the inner two layers are used as the power supply layer 84 and the ground layer 85, respectively. In the power supply layer 84, a first power supply line 841 and a second power supply line 842 are provided in a state of being separated from each other. The first power supply line 841 is drawn to the surface 83 a of the circuit board 83 by through

vias

861 and 862. The second power supply line 842 is drawn out to the surface 83 a of the circuit board 83 by through

vias

863 and 864. The through

vias

862 and 863 are arranged so that the distance between them is approximately the same as the distance between the pair of

anode terminals

21 and 22 constituting the decoupling device 80.

In the ground layer 85, a ground line 851 is provided. The ground line 851 is drawn to the surface 83 a of the circuit board 83 by the through via 865. The through via 865 is disposed at a position between the through

vias

862 and 863 while being electrically insulated from the first and second

power supply lines

841 and 842. The ground line 851 is drawn out to the back surface 83b of the circuit board 83 by the through via 866 and connected to the ground.

The load circuit 81 is connected to the through via 861 on the surface 83 a of the circuit board 83. The power supply circuit 82 is connected to the through via 864 on the surface 83 a of the circuit board 83. Thereby, the load circuit 81 is connected to the first power supply line 841 through the through via 861, and the power supply circuit 82 is connected to the second power supply line 842 through the through via 864.

The decoupling device 80 is mounted on the surface 83a of the circuit board 83 as follows. That is, the pair of

anode terminals

21 and 22 of the decoupling device 80 are connected to the through

vias

862 and 863, respectively, and the cathode terminal 23 is connected to the through via 865. Thus, the pair of

anode terminals

21 and 22 are connected to the first and second

power supply lines

841 and 842 through the through

vias

862 and 863, respectively, and the cathode terminal 23 is connected through the through visa 865 and the ground line 851. Connected to ground.

Thereby, in the mounting body described above, as shown in FIG. 10, the first and second

power supply lines

841 and 842 are electrically connected by the transmission member 3 of the decoupling device 80, and the transmission member 3 and the ground are connected. Capacitors C11 and C12 are formed between the two.

The mounting body described above can be grasped as follows. That is, the load circuit 81 is connected to the first power supply line 841, and the power supply layer 84 extends from the load circuit 81 toward the power supply circuit 82. The power supply circuit 82 is connected to the second power supply line 842, and the power supply layer 84 extends from the power supply circuit 82 toward the load circuit 81. The ground line 851 is connected to the ground. The pair of

anode terminals

21 and 22 of the decoupling device 80 are connected to one end of the first power supply line 841 and one end of the second power supply line 842 between the load circuit 81 and the power supply circuit 82. The terminal 23 is connected to the ground line 851.

3. Effect According to the decoupling device described above, the direct current flowing between the pair of

anode terminals

21 and 22 does not pass through the

anode portions

102 and 102 of the first and

second capacitor elements

11 and 12, Since it passes through the transmission member 3 outside the

second capacitor elements

11 and 12, it is possible to pass a larger direct current than the conventional decoupling device. Specifically, in the conventional decoupling device, only a direct current of about 2 A to 6 A can be passed, but in the decoupling device according to the present embodiment, a direct current of 10 A or more can be passed.

Therefore, in the mounting body (see FIG. 9) on which the decoupling device is mounted, a large direct current can be passed through the first and second

power supply lines

841 and 842. That is, it becomes possible to supply a direct current having a large amount of current from the power supply circuit 82 to the load circuit 81. Therefore, it is possible to cope with an increase in the operating speed of the load circuit.

Further, according to the above-described decoupling device, the first and

second capacitor elements

11 and 12 can guide the high-frequency current flowing from the pair of

anode terminals

21 and 22 to the cathode terminal 23. In the mounting body described above, the high-frequency current flows from the cathode terminal 23 through the ground layer 85 to the ground (see FIGS. 9 and 10). Therefore, the high frequency current can be removed from the first and second

power supply lines

841 and 842. That is, the decoupling device functions as a noise filter.

In the decoupling device according to the present embodiment, by providing the constricted portion 34 in the transmission member 3 as described above (FIG. 7), specifically, the constricted portion 34 is provided in the third facing portion 33. Thus, the inductance of the transmission member 3 is increased in a portion (a portion including the third facing portion 33) existing between the

anode portions

102, 102 of the first and

second capacitor elements

11, 12. Therefore, the high-frequency current that has flowed into the decoupling device from the pair of

anode terminals

21 and 22 is easily guided toward the first or

second capacitor element

11 or 12. Thereby, the function as a noise filter of a decoupling device is improved.

From the viewpoint of improving the function of the decoupling device as a noise filter, in the above-described decoupling device, the portion of the transmission member 3 that exists between the anode portions 102 of the first and

second capacitor elements

11 and 12 is included. It is preferable to set the inductance (inductance of the coil L2 shown in FIG. 8) to be larger than the equivalent series inductance of the first and second capacitor elements (inductance of the coils L11 and L12 shown in FIG. 8).

As a result, the high-frequency current flowing into the decoupling device from the pair of

anode terminals

21 and 22 is easily guided toward the first or

second capacitor element

11 or 12 having an inductance smaller than that of the transmission member 3 (coil L2). .

Further, in the decoupling device according to the present embodiment, a solid electrolytic capacitor having a small equivalent series resistance (ESR) is used as the first and

second capacitor elements

11 and 12, thereby functioning as a noise filter of the decoupling device. Is increasing.

Furthermore, in the decoupling device according to the present embodiment, the

anode portions

102 and 102 of the first and

second capacitor elements

11 and 12 exist between the pair of

anode terminals

21 and 22 in the transmission member 3. Connected to the part (FIG. 1). Therefore, the high-frequency current flowing into the decoupling device from the pair of

anode terminals

21 and 22 is easily guided toward the first or

second capacitor element

11 or 12.

Furthermore, according to the decoupling device described above, since the transmission member 3 is disposed in a state exposed on the surface of the resin layer 4, the heat generated in the transmission member 3 can be efficiently released. This prevents the decoupling device from being destroyed due to the heat generated by the transmission member 3.

<Verification of effects>
This inventor verified by simulation about the effect that the function as a noise filter of a decoupling device increases. FIG. 11 shows the result of the simulation, and the high-frequency current transmission characteristics are represented by the relationship between the frequency and the S parameter.

Specifically, the above simulation is performed for the decoupling device according to the present embodiment, the configuration without the constricted portion 34 in the decoupling device as shown in FIGS. 12 and 13, and the conventional configuration. It was. In the decoupling device according to the present embodiment, solid electrolytic capacitors having a capacitance of 470 μF are used as the first and

second capacitor elements

11 and 12. Further, a copper plate having a thickness T (see FIG. 4) of 0.5 mm is used as the transmission member 3, and the length L and width W (see FIG. 4) of the third facing portion 33 are 8 mm and 4 mm, respectively, and the constricted portion The length Y1 and the width W1 (see FIG. 4) were 6 mm and 1 mm. Then, the S parameter of the high-frequency current flowing from the first anode terminal 21 to the second anode terminal 22 with the cathode terminal 23 connected to the ground is obtained for a frequency in the range of 1 × 10 ⁺⁴ Hz to 1 × 10 ⁺¹⁰ Hz. It was. The result of the simulation for the decoupling device according to the present embodiment is shown by a graph G0 in FIG.

On the other hand, in the above-described form of the decoupling device without the constricted portion 34, the conditions other than the condition that the constricted portion 34 is not present (conditions such as capacitance) are the same as the conditions of the decoupling device described above. The result of the simulation for the form without the constricted portion 34 is shown by the graph G1 in FIG.

Further, in the conventional form, as shown in FIG. 14, two capacitors C21 and C22 having a two-terminal structure are connected between the power supply line 7 and the ground, and capacitors C21 and C22 having a two-terminal structure are formed as static. A solid electrolytic capacitor having a capacitance of 470 μF was used. Then, the S parameter of the high-frequency current flowing from the one end 7a to the other end 7b of the power supply line 7 was obtained for frequencies in the range of 1 × 10 ⁺⁴ Hz to 1 × 10 ⁺¹⁰ Hz. The result of the simulation for the conventional configuration is shown by a graph G2 in FIG.

As shown in FIG. 11, in the conventional form (graph G2), the S parameter increases monotonously as the frequency increases. On the other hand, in the decoupling device (graph G0) according to the present embodiment, the S parameter is approximately the same as that in the conventional mode in the frequency range of 1 × 10 ⁺⁴ Hz to 1.3 × 10 ⁺⁵ Hz. However, as the frequency increases from 1.3 × 10 ⁺⁵ Hz, the S parameter gradually decreases and becomes a minimum at a frequency near 1.2 × 10 ⁺⁶ Hz. As the frequency further increases, the S parameter increases monotonically, but its value remains smaller than that of the conventional form. That is, according to the decoupling device according to the present embodiment, the high-frequency current is more easily removed at a frequency higher than 1.3 × 10 ⁺⁵ Hz than the conventional configuration.

Thus, it was verified that the decoupling device according to the present embodiment has a function as a noise filter that is higher than that of the conventional configuration.

Further, as shown in FIG. 11, in the configuration without the constricted portion 34 (graph G1), the conventional configuration is used at a frequency larger than 1.3 × 10 ⁺⁵ Hz, similarly to the decoupling device according to the present embodiment. The S parameter is smaller than that, and the high-frequency current is easily removed. However, FIG. 11 shows that the S parameter is smaller in the decoupling device (graph G0) according to the present embodiment than in the configuration without the constricted portion 34 (graph G1).

Thus, it can be seen that by providing the constricted portion 34 in the transmission member 3, the function as a noise filter of the decoupling device is easily enhanced.

4). Modification <Modification 1>
In the decoupling device described above (see FIG. 7), the constricted portion 34 extends straight along the upper surfaces of the first and

second capacitor elements

11 and 12 with a uniform width W1, but the constricted portion 34 is As shown in FIGS. 15 and 16, the width W <b> 1 may be gradually reduced from both ends 34 a and 34 b toward the center.

Also in the decoupling device according to this modification, the inductance of the transmission member 3 is increased in the portion existing between the

anode portions

102 and 102 of the first and

second capacitor elements

11 and 12.

It should be noted that the shape of the constricted portion 34 is not limited to the shape shown in FIG. That is, in the region 3a of the transmission member 3 (see FIG. 4 or 16), if the width W1 of the constricted portion 34 is narrower than the width of the other region 3b of the transmission member 3, this shape is the constricted portion 34. It can be adopted as a shape.

<Modification 2>
In the decoupling device described above, the arrangement of the first and

second capacitor elements

11 and 12 may be changed as follows. That is, as shown in FIG. 17, the positions of the first and

second capacitor elements

11 and 12 can be changed without changing the protruding

directions

91 and 92 of the

anode portions

102 and 102 from the

anode bodies

101 and 101. Good (first aspect).

Further, as shown in FIGS. 18 and 19, the first and

second capacitor elements

11, 12 have the protruding

directions

91, 92 of the

anode portions

102, 102 facing in opposite directions, and along the protruding direction 91. You may line up (2nd aspect).

According to the above arrangement, the length of the portion of the transmission member 3 existing between the

anode portions

102 and 102 of the first and

second capacitor elements

11 and 12 is increased, so that the inductance (see FIG. The inductance of the coil L2 shown in FIG. Therefore, the high-frequency current that has flowed into the decoupling device from the pair of

anode terminals

21 and 22 easily flows to the first or

second capacitor element

11 or 12. That is, the function of the decoupling device as a noise filter is enhanced.

In addition, as shown in FIGS. 20 and 21, the first and

second capacitor elements

11 and 12 may have the protruding

directions

91 and 92 of the

anode portions

102 and 102 directed in the same direction (third mode). . In such an aspect, the first and

second capacitor elements

11 and 12 are arranged such that the

regions

11a and 12a (see FIG. 21) where the

anode portions

102 and 102 protrude are positioned in the same plane, The transmission member 3 extends along both the

regions

11a and 12a. The constricted portion 34 is formed in a region 3 a extending between the

anode portions

102, 102 of the first and

second capacitor elements

11, 12, that is, a position between the

cuts

31 a, 32 a. The width is narrower than the region 3b.

<Modification 3>
In the decoupling device described above, the pair of

anode terminals

21 and 22 and the transmission member 3 are separate members. However, as shown in FIG. 22, the pair of

anode terminals

21 and 22 and the transmission member 3 are integrally formed. It may be formed. For example, a pair of

anode terminals

21 and 22 formed integrally with the transmission member 3 can be obtained by bending both ends of the transmission member formed in a U-shape. Further, the lower end portions 311 and 321 (FIG. 4) of the transmission member 3 may be used as the

anode terminals

21 and 22.

In addition, also in the decoupling device shown by FIG.18 and FIG.20, a pair of

anode terminals

21 and 22 and the transmission member 3 are integrally formed.

<Modification 4>
In the decoupling device described above, the transmission member 3 is configured by a strip-shaped metal plate. However, as illustrated in FIG. 23, the transmission member 3 may be configured by a zigzag metal plate.

According to the decoupling device according to this modification, the length of the portion existing between the

anode portions

102 and 102 of the first and

second capacitor elements

11 and 12 is increased, and thus the inductance (see FIG. The inductance of the coil L2 shown in FIG. Specifically, the length of the third facing portion 33 that was about 8 mm in the decoupling device shown in FIG. 1 can be increased to about 10 to 15 mm in the decoupling device according to this modification.

Therefore, the high-frequency current flowing into the decoupling device from the pair of

anode terminals

21 and 22 is likely to flow to the first or

second capacitor elements

11 and 12, thereby enhancing the function of the decoupling device as a noise filter.

The configuration of each part of the present invention is not limited to the above-described embodiment, and various modifications can be made within the technical scope described in the claims. For example, the arrangement of the first and

second capacitor elements

11 and 12 can be changed according to the power supply line provided on the circuit board. Various capacitors other than solid electrolytic capacitors may be used for the first and

second capacitor elements

11 and 12. Further, the capacitances of the first and

second capacitor elements

11 and 12 may be different from each other. Furthermore, although the decoupling device described above is configured by two capacitor elements (first and second capacitor elements 11 and 12), the decoupling device may be configured by three or more capacitor elements. .

It is the perspective view which showed the decoupling device which concerns on embodiment of this invention. It is a perspective view of a decoupling device with illustration of a transmission member omitted. It is the perspective view which turned upside down and showed the decoupling device. It is a disassembled perspective view of a decoupling device. FIG. 5 is a cross-sectional view of the solid electrolytic capacitor along the line VV shown in FIG. 4. FIG. 6 is a cross-sectional view of the decoupling device taken along line VI-VI shown in FIG. 1. It is a perspective view of a decoupling device for explaining a constriction part of a transmission member. It is the circuit diagram which showed the equivalent circuit of the decoupling device. It is sectional drawing which showed the mounting body with which the decoupling device was mounted. It is the circuit diagram which showed the mounting body with which the decoupling device was mounted. It is the figure which showed the transmission characteristic of the high frequency current with the graph. It is the perspective view which showed the decoupling device without a constriction part. It is a disassembled perspective view of the decoupling device without a constriction part. It is the circuit diagram which showed the conventional form. FIG. 10 is a perspective view showing a decoupling device according to Modification 1. FIG. 10 is an exploded perspective view of a decoupling device according to Modification 1. 10 is a perspective view showing a decoupling device according to a first aspect of modification 2. FIG. 10 is a perspective view showing a decoupling device according to a second aspect of Modification 2. FIG. It is a disassembled perspective view of the decoupling device which concerns on a 2nd aspect. FIG. 10 is a perspective view showing a decoupling device according to a third aspect of modification 2. It is a disassembled perspective view of the decoupling device which concerns on a 3rd aspect. FIG. 10 is a perspective view showing a decoupling device according to Modification 3. FIG. 10 is a perspective view showing a decoupling device according to Modification 4.

DESCRIPTION OF SYMBOLS 11 1st capacitor | condenser element 11a Area | region where the anode part protrudes 12 Second capacitor element 12a Area | region where the anode part protrudes 101 Anode body 102 Anode part 103 Dielectric layer 104 Electrolyte layer 105

Cathode part

21,22 Pair Anode terminal 23 cathode terminal 3 transmission member 31 first facing portion 32 second facing portion 33 third facing portion 34 constricted portion W1 width of constricted portion 4 resin layer 80 decoupling device 81 load circuit 82 power supply circuit 83 circuit board 841 first 1 power supply line 842 2nd power supply line 851

Ground line

91, 92 Projection direction of anode part 93 Direction perpendicular to projection direction

Claims

A first capacitor element comprising an anode part, a cathode part, and a dielectric layer interposed between the anode part and the cathode part;
A second capacitor element comprising an anode part electrically insulated from the anode part of the first capacitor element, a cathode part, and a dielectric layer interposed between the anode part and the cathode part;
A pair of anode terminals;
A cathode terminal connected to the cathode portions of the first and second capacitor elements;
A conduction member between the pair of anode terminals outside the first and second capacitor elements, and a transmission member connected to the anode portions of the first and second capacitor elements;
The transmission member is plate-shaped and is disposed along the surfaces of the first and second capacitor elements, and the transmission member is disposed in a region extending between the anode portions of the first and second capacitor elements. A decoupling device having a constriction narrower than other regions.
The inductance of the part which exists between the anode parts of the said 1st and 2nd capacitor | condenser element among the said transmission members is larger than each equivalent series inductance of the said 1st and 2nd capacitor | condenser element. Decoupling device.
The decoupling device according to claim 1 or 2, wherein anode portions of the first and second capacitor elements are connected to a portion of the transmission member that exists between the pair of anode terminals.
Each of the first and second capacitor elements is formed on the anode body in which the anode portion projects, an oxide film that covers the surface of the anode body and forms the dielectric layer, and the surface of the oxide film A solid electrolytic capacitor comprising: an electrolyte layer to be formed; and a cathode layer that is formed on a surface of the electrolyte layer and constitutes the cathode portion;
4. The decoupling device according to claim 1, wherein anode portions of the first and second capacitor elements are electrically insulated from each other by the oxide film. 5.
The transmission member is in contact with the anode portion of the first capacitor element, and has a first facing portion that faces a region of the surface of the first capacitor element where the anode portion protrudes, and the second capacitor A contact between the anode portion of the element, a second facing portion facing a region where the anode portion projects from the surface of the second capacitor, and extending between the first and second facing portions. The first and second opposing portions are connected to each other and the third opposing portion is opposed to at least a part of the surface of the first or second capacitor element. The constricted portion is formed in the third opposing portion. The decoupling device according to claim 4.
6. The decoupling according to claim 4, wherein the first capacitor element and the second capacitor element have their anode portions protruding from the anode body in directions opposite to each other, and are arranged along the protruding direction. device.
The said 1st and 2nd capacitor | condenser element orient | assigns the protrusion direction of the anode part from the said anode body to a mutually opposing direction, and is located in a line with the direction perpendicular | vertical to this protrusion direction. The decoupling device described.
The decoupling device according to claim 4 or 5, wherein the first and second capacitor elements have the anode portion protruding from the anode body in the same direction.
9. A resin layer covering the first and second capacitor elements is further provided, and anode portions of the first and second capacitor elements are electrically insulated from each other by the resin layer. The decoupling device according to any one of the above.
The decoupling according to any one of claims 1 to 9, further comprising a resin layer covering the first and second capacitor elements, wherein the transmission member is exposed on a surface of the resin layer. device.
The decoupling device according to any one of claims 1 to 10, wherein the cathode terminal is a single terminal connected to cathode portions of the first and second capacitor elements.
A decoupling device according to any one of claims 1 to 11,
A load circuit;
A power supply circuit for supplying a direct current to the load circuit;
A mounting body comprising a circuit board on which a first power line, a second power line, and a ground line are formed, wherein a decoupling device, a load circuit, and a power circuit are mounted on the circuit board,
The first power supply line is connected to the load circuit and extends from the load circuit toward the power supply circuit, and the second power supply line is connected to the power supply circuit and extends from the power supply circuit toward the load circuit. The ground line is connected to the ground,
The pair of anode terminals of the decoupling device is connected to one end of the first power supply line and one end of the second power supply line between the load circuit and the power supply circuit, and the cathode terminal is connected to the ground line An implementation that is connected to