JP2010056411A - Decoupling device and package - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a decoupling device which draws a large amount of DC current and includes a wide frequency band that removes high frequency currents from the power supply line. <P>SOLUTION: The decoupling device includes first and second capacitor elements 11 and 12, a pair of anode terminals 21 and 22, a cathode terminal 23, and a transmission member 3. The first and second capacitor elements 11 and 12 are solid electrolytic capacitors, whose anodes 102 and 102 are electrically insulated from each other. The second capacitor element 12 includes smaller capacitance than that of the first capacitor element 11. The cathode terminal 23 is connected with cathodes of the first and second capacitor elements 11 and 12. The transmission member 3 makes the pair of anode terminals 21 and 22 conductive with each other outside the first and second capacitor elements 11 and 12, and the anodes 102 and 102 of the first and second capacitor elements 11 and 12 are connected to it. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  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 capacitor having a two-terminal structure 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 capacitor (decoupling device) having a three-terminal structure 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 electrolytic capacitor functions as a noise filter between the power supply line and the ground.
JP 2004-80773 A

  However, it is difficult for a conventional three-terminal capacitor to pass a large amount of direct current through the power supply 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 a conventional three-terminal 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.

  Furthermore, in the conventional three-terminal capacitor configuration, although the equivalent series inductance (ESL) is small, there is only one self-resonant frequency. It has been difficult to expand to a bandwidth that can handle a wider bandwidth.

  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 having a wide frequency band of a high-frequency current that can be removed from the power supply line.

  The decoupling device according to the first aspect of 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. A member (3). 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), and has a capacitance smaller than that of the first capacitor element. 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.

  According to the decoupling device according to the first aspect, the direct current flowing between the pair of anode terminals does not pass through the anode portions of the first and second capacitor elements, and is outside the first and second capacitor elements. Since it passes through a certain transmission member, a larger direct current can flow than in a conventional decoupling device. Further, the first and second capacitor elements can guide the high-frequency current flowing from the pair of anode terminals to the cathode terminal. 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 addition, since the capacitances of the first and second capacitor elements are different from each other, the frequency band of the high-frequency current that can be removed is different between the first capacitor element and the second capacitor element. Therefore, it is possible to expand the frequency band of the high-frequency current that can be removed as compared with the conventional decoupling device.

  The decoupling device according to the second aspect of 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. A member (3). 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. A self-resonant frequency (ωc2) of a circuit constituted by the second capacitor element and the transmission member is between one anode terminal (21) and the cathode terminal (23) of the pair of anode terminals. The self-resonance frequency (ωc1) of the circuit constituted by the first capacitor element and the transmission member is higher between the one anode terminal and the cathode terminal.

  According to the decoupling device according to the second aspect, the direct current flowing between the pair of anode terminals does not pass through the anode portions of the first and second capacitor elements and is outside the first and second capacitor elements. Since it passes through a certain transmission member, a larger direct current can flow than in a conventional decoupling device. Further, the first and second capacitor elements can guide the high-frequency current flowing from the pair of anode terminals to the cathode terminal. 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 addition, since the self-resonant frequencies of the two circuits are different from each other, the frequency band of the high-frequency current that can be removed differs between the two circuits. Therefore, it is possible to expand the frequency band of the high-frequency current that can be removed as compared with the conventional decoupling device.

  In a 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 (21) of the transmission member (3). , 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 specific aspect, 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 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. Thereby, the width | variety of a transmission member can be expanded with respect to the direction of the electric current which flows between a pair of anode terminals, without enlarging the size of a decoupling device. Therefore, it is possible to increase the amount of direct current that can be passed through the transmission member.

  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) have the same protruding direction (91, 92) of the anode part (102, 102) from the anode body (101, 101). You may point to.

  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 efficiently released. Therefore, it is possible to prevent the decoupling device from being destroyed due to heat generation of the transmission member.

  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 (851). 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.

  In a specific aspect of the mounting body, the pair of anode terminals (21, 22) of the decoupling device (80) includes the first capacitor element (11) positioned on the load circuit (81) side, The second capacitor element (12) is connected to one end of the first power supply line (841) and one end of the second power supply line (842) so that the second capacitor element (12) is positioned on the power supply circuit (82) side.

  According to the specific aspect, when load fluctuation occurs in the load circuit, the decoupling device functions as a storage battery, and the capacitor element arranged on the load circuit side among the first and second capacitor elements, Charge is supplied to the load circuit. Therefore, by arranging the first capacitor element having a large capacitance on the load circuit side, it is possible to supply a large amount of electric charge to the load circuit, and thus it is possible to drive the load circuit stably. It becomes.

  According to the present invention, it is possible to flow a direct current having a large amount of current through the power supply line, and it is possible to expand the frequency band of the high-frequency current that can be removed 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 portion 102 is configured 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 portions 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. The resin layer 4 is made of a resin material such as an epoxy resin.

  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. 8) 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 this 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 belt-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. . 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 322, 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, and thus the decoupling device can be reduced in size.

  The decoupling device described above can be represented by an equivalent circuit shown in FIG. That is, the equivalent circuit includes the 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 the portion of the transmission member 3 that exists between the anode portion 102 and the anode terminal 22 of the first capacitor element 12.

2. About the mounting body on which the decoupling device is mounted The mounting body on which the decoupling device described above is mounted includes a load circuit 81 such as a CPU and a power supply circuit that supplies a direct current to the load circuit 81 as shown in FIG. 82 and a circuit board 83. In FIG. 8, 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.

  A ground line 851 is provided in the ground layer 85. 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. 9, 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 82. 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 (Part 1)
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, and the first and second Since it passes through the transmission member 3 outside the two-capacitor elements 11 and 12, a larger direct current can flow than in the conventional decoupling device.

  Therefore, in the mounting body (see FIG. 8) on which the decoupling device is mounted, a direct current having a large amount of current can flow 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.

  In the decoupling device according to the present embodiment, the first and second capacitor elements 11 and 12 are directed so that the protruding directions 91 and 92 of the anode portions 102 and 102 are opposite to each other and perpendicular to the protruding direction 91. They are lined up along the direction 93 (FIG. 4). Thereby, without increasing the size of the decoupling device, the width W of the transmission member 3 in the vertical direction 93, that is, in the direction of the current flowing between the pair of anode terminals 21 and 22 (FIG. 4). Can be expanded.

  In the decoupling device according to the present embodiment, the width W of the transmission member 3 is expanded to the same size as the entire width of the first and second capacitor elements 11 and 12. Therefore, a larger direct current can be passed through the transmission member 3.

  Specifically, in the conventional decoupling device, only a direct current of about 2A to 6A can flow, but in the decoupling device according to the present embodiment, a direct current of 10A or more can flow.

  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. 8 and 9). 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, 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.

  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 are portions of the transmission member 3 that exist between the pair of anode terminals 21 and 22. (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 arranged in a state of being 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.

4). Effect (2)
According to the configuration of the decoupling device according to the present embodiment, it is possible to use separate capacitor elements having a desired capacitance as the first and second capacitor elements 11 and 12 that function as noise filters. . Therefore, the capacitances of the first and second capacitor elements 11 and 12 can be made different from each other.

  Specifically, as shown in FIGS. 10 and 11, as the second capacitor element 12, a solid electrolytic capacitor having a length Z in the protruding direction 92 smaller than that of the first capacitor element 11 is used. Capacitance of the capacitor element 12 (capacitance of the capacitor C12 shown in FIG. 7) may be made smaller than that of the first capacitor element 11 (capacitance of the capacitor C11 shown in FIG. 7). it can.

  By making the capacitances of the first and second capacitor elements 11 and 12 different from each other, the frequency band of the high-frequency current that can be removed can be made different between the first capacitor element and the second capacitor element. Therefore, the frequency band of the high-frequency current that can be removed by the above-described decoupling device can be expanded as compared with the conventional decoupling device.

  Further, as shown in FIG. 7, the decoupling device according to the present embodiment is configured to guide the high frequency current flowing from one anode terminal 21 of the pair of anode terminals 21 and 22 to the cathode terminal 23. Two resonant circuits (first and second circuits) are formed. The first circuit is configured by the first capacitor element 11 and the transmission member 3 between the anode terminal 21 and the cathode terminal 23. Specifically, the first circuit includes a capacitor C11 and a coil L11 representing the capacitance and inductance of the first capacitor element 11, and the anode 102 and the anode terminal 21 of the first capacitor element 11 of the transmission member 3. It is comprised by the coil L1 showing the inductance of the part which exists in between.

  The second circuit is configured by the second capacitor element 12 and the transmission member 3 between the anode terminal 21 and the cathode terminal 23. Specifically, the first circuit includes a capacitor C12 and a coil L12 representing the capacitance and inductance of the second capacitor element 12, and the anode 102 and the anode terminal 21 of the second capacitor element 12 of the transmission member 3. It is comprised by the coils L1 and L2 showing the inductance of the part which exists in between.

  According to the configuration of the decoupling device described above, it is possible to use separate capacitor elements having a desired capacitance as the first and second capacitor elements 11 and 12 functioning as noise filters. In addition, it is possible to design the transmission member 3 so as to have a desired inductance. This is because the transmission member 3 is disposed outside the first and second capacitor elements 11 and 12, and thus the shape and the like of the transmission member 3 can be easily changed. Therefore, it is possible to design the self-resonant frequencies of the first and second circuits to be different desired frequencies.

  By making the self-resonant frequencies of the first and second circuits different desired frequencies, the frequency band of the high-frequency current that can be removed can be made different between the first circuit and the second circuit. Therefore, the frequency band of the high-frequency current that can be removed can be expanded as compared with the conventional decoupling device.

<Verification of effects>
The inventor of the present application verified the effect of expanding the frequency band of the high-frequency current that can be removed by the decoupling device by simulation. FIG. 12 shows the result of the simulation, and the change in impedance with respect to the frequency of the high-frequency current is represented by a graph.

  Specifically, the simulation uses a solid electrolytic capacitor having a capacitance of 470 μF as the first capacitor element 11 and a capacitance of 47 μF as the second capacitor element 12 in the decoupling device according to the present embodiment. A solid electrolytic capacitor element was used. The sum of the inductances of the coils L11 and L1 constituting the first circuit is designed to be larger than the sum of the inductances of the coils L12, L1 and L2 constituting the second circuit.

Then, in the case where a high-frequency current is passed from one anode terminal 21 to the other anode terminal 22 with the cathode terminal 23 connected to the ground, the respective impedances of the first circuit and the second circuit, and the decoupling device The impedance between one anode terminal 21 and the cathode terminal 23 was determined for a frequency in the range of 1 × 10 ⁺⁴ Hz to 1 × 10 ⁺¹⁰ Hz. In FIG. 12, the change in the impedance of the first circuit with respect to the frequency is shown by a graph G11, and the change in the impedance of the second circuit with respect to the frequency is shown by a graph G12. Further, a change in impedance between the anode terminal 21 and the cathode terminal 23 with respect to the frequency is shown by a graph G13.

  From the simulation result (FIG. 12), it can be seen that the self-resonant frequency ωc2 of the second circuit is higher than the self-resonant frequency ωc1 of the first circuit. This is because the capacitance (47 μF) of the second capacitor element 12 is smaller than the capacitance (470 μF) of the first capacitor element 11, so that the second capacitor element 12 in the low frequency region where the impedance generated by the capacitor component is dominant This is because the impedance of the circuit (graph G12) is larger than the impedance of the first circuit (graph G11).

  In addition, since the sum of the inductances of the coils L11 and L1 constituting the first circuit is designed to be larger than the sum of the inductances of the coils L12, L1 and L2 constituting the second circuit, In the high frequency region where the generated impedance is dominant, the impedance of the second circuit (graph G12) is smaller than the impedance of the first circuit (graph G11). This is also a factor that causes the self-resonant frequency ωc2 of the second circuit to be higher than the self-resonant frequency ωc1 of the first circuit.

  From the simulation results (FIG. 12), the impedance (graph G13) between the anode terminal 21 and the cathode terminal 23 is the impedance of the first circuit (graph G11) and the impedance of the second circuit (graph G12). The impedance of the smaller value is almost equal. That is, in the region on the higher frequency side than the frequency ω0 where the graph G11 and the graph G12 intersect, the graph G13 changes along the graph G12, and in the region on the lower frequency side than the frequency ω0, the graph G13 follows the graph G11. Have changed.

  Therefore, the impedance (graph G13) between the anode terminal 21 and the cathode terminal 23 is small between the self-resonant frequency ωc1 of the first circuit and the self-resonant frequency ωc2 of the second circuit. That is, the frequency band of the high-frequency current that can be removed by the decoupling device is widened.

  Thereby, it was verified that the frequency band of the high-frequency current that can be removed by the decoupling device according to the present embodiment is expanded. Further, according to the decoupling device according to the present embodiment, the frequency band of the high-frequency current that can be removed by a simple method such as selection of the first and second capacitor elements 11 and 12 and the design of the transmission member 3 is obtained. It can be seen that it can be expanded.

5). Connection of Decoupling Device in Mounted Body When the first capacitor element 11 has a capacitance larger than the capacitance of the second capacitor element 12, as in the decoupling device shown in FIG. 8, the decoupling device is preferably connected to the first and second power supply lines 841 and 842 as follows.

  That is, as shown in FIG. 9, the pair of anode terminals 21 and 22 of the decoupling device 80 includes a first capacitor element having a larger capacitance than the second capacitor element 12 on the load circuit 81 side, It is preferable that the second capacitor element 12 is connected to the first power supply line 841 and the second power supply line 842 so that the second capacitor element 12 is located on the power supply circuit 82 side.

  This is because, when a load change occurs in the load circuit 81, the decoupling device 80 functions as a storage battery, and the load circuit side of the first and second capacitor elements 11 and 12 is changed from the capacitor element arranged on the load circuit side. This is because charge is supplied to 81. Therefore, by arranging the first capacitor element 11 having a large capacitance on the load circuit 81 side, it is possible to supply a large amount of electric charge to the load circuit 81, thereby driving the load circuit 81 stably. It becomes possible to make it.

6). Modification <Modification 1>
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. 13, the projecting directions 91 and 92 of the anode portions 102 and 102 from the anode bodies 101 and 101 are not changed, and only the positions of the first and second capacitor elements 11 and 12 are replaced. Good (first aspect).

  Further, as shown in FIGS. 14 and 15, the first and second capacitor elements 11 and 12 have the protruding directions 91 and 92 of the anode portions 102 and 102 directed 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. 16 and 17, 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 embodiment, the first and second capacitor elements 11 and 12 are arranged such that the regions 11a and 12a on which the anode portions 102 and 102 project are positioned in the same plane, and the transmission member 3 is It extends along the regions 11a and 12a. And the 1st opposing part 31 of the transmission member 3 is facing the area | region 11a, and the notch 31a for making the anode part 102 of the 1st capacitor | condenser element 11 contact is formed. The second facing portion 32 faces the region 12a, and a notch 32a for contacting the anode portion 102 of the second capacitor element 12 is formed. The third facing portion 33 faces both the regions 11a and 12a at a position between the first and second facing portions 21.

  13 to 17 used in the description of this modification, a solid electrolytic capacitor having a length Z in the protruding direction 92 smaller than that of the first capacitor element 11 is used as the second capacitor element 12, that is, A case where the capacitance of the second capacitor element 12 is smaller than the capacitance of the first capacitor element 11 is shown.

<Modification 2>
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. 18, the pair of anode terminals 21 and 22 and the transmission member 3 are integrated. 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 the decoupling device shown in FIGS. 14 and 16, the pair of anode terminals 21 and 22 and the transmission member 3 are integrally formed. In FIG. 18, when a solid electrolytic capacitor having a length Z in the protruding direction 92 smaller than that of the first capacitor element 11 is used as the second capacitor element 12, that is, the capacitance of the second capacitor element 12 is The case where it is smaller than the electrostatic capacitance of the 1st capacitor | condenser element 11 is shown.

<Modification 3>
In the decoupling device described above, the transmission member 3 is configured by a strip-shaped metal plate. However, as illustrated in FIG. 19, the transmission member 3 may be configured by a zigzag metal plate. In FIG. 19, when a solid electrolytic capacitor having a length Z in the protruding direction 92 smaller than that of the first capacitor element 11 is used as the second capacitor element 12, that is, the capacitance of the second capacitor element 12 is The case where it is smaller than the electrostatic capacitance of the 1st capacitor | condenser element 11 is shown.

  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 that has flowed 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 increasing the function of the decoupling device as a noise filter.

<Modification 4>
In the decoupling device described above, the inductance (the inductance of the coil L2 shown in FIG. 7) of the portion of the transmission member 3 existing between the anode portions 102 of the first and second capacitor elements 11 and 12 is the first. Also, it may be set to be larger than the equivalent series inductance of the second capacitor element (inductance of the coils L11 and L12 shown in FIG. 7).

  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). . Therefore, the function as a noise filter of the decoupling device is enhanced.

  In addition, each part structure of this invention is not restricted to the said embodiment, A various deformation | transformation is possible within the technical scope as described in a claim. 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. Moreover, 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. It is sectional drawing of the solid electrolytic capacitor which follows the VV line shown by FIG. It is sectional drawing of the decoupling device which follows the VI-VI line shown by FIG. 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 perspective view which showed the decoupling device provided with two capacitor | condenser elements from which electrostatic capacitance differs. It is an exploded perspective view of a decoupling device provided with two capacitor elements with different electrostatic capacities. It is the figure which showed the change of the impedance with respect to a frequency with a graph. FIG. 9 is a perspective view showing a decoupling device according to a first aspect of modification example 1; FIG. 12 is a perspective view showing a decoupling device according to a second aspect of modification example 1. It is a disassembled perspective view of the decoupling device which concerns on a 2nd aspect. FIG. 9 is a perspective view showing a decoupling device according to a third aspect of modification example 1. 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 2. FIG. 10 is a perspective view showing a decoupling device according to Modification 3.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 1st capacitor | condenser element 12 2nd capacitor | condenser element 101 Anode body 102 Anode part 103 Dielectric layer 104 Electrolyte layer 105 Cathode part 21 and 22 A pair of anode terminal 23 Cathode terminal 3 Transmission member 31 1st opposing part 32 2nd opposing part 33 Third opposing portion 4 Resin layer 80 Decoupling device 81 Load circuit 82 Power supply circuit 83 Circuit board 841 First power supply line 842 Second power supply line 851 Ground line 91, 92 Projection direction of anode part 93 Direction perpendicular to projection direction ωc1 First Self-resonant frequency of one circuit ωc2 Self-resonant frequency of second circuit

Claims (11)

A first capacitor element comprising an anode part, a cathode part, and a dielectric layer interposed between the anode part and the cathode part;
The anode portion of the first capacitor element includes an anode portion that is electrically insulated, a cathode portion, and a dielectric layer interposed between the anode portion and the cathode portion. A second capacitor element having a capacitance smaller than the capacitance;
A pair of anode terminals;
A cathode terminal connected to the cathode portions of the first and second capacitor elements;
A decoupling device comprising a transmission member that conducts between the pair of anode terminals outside the first and second capacitor elements and to which the anode portions of the first and second capacitor elements are connected. 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;
Between the one anode terminal and the cathode terminal of the pair of anode terminals, a self-resonant frequency of a circuit constituted by the second capacitor element and the transmission member is the one anode terminal and the cathode terminal. A decoupling device having a frequency greater than a self-resonant frequency of a circuit constituted by the first capacitor element and the transmission member.   3. The decoupling device according to claim 1, 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;
The decoupling device according to any one of claims 1 to 3, wherein anode portions of the first and second capacitor elements are electrically insulated from each other by the oxide film.   5. The decoupling according to claim 4, wherein the first and second capacitor elements are arranged along a direction perpendicular to the projecting direction while directing the projecting direction of the anode part from the anode body in directions opposite to each other. device.   5. The decoupling device according to claim 4, wherein the first and second capacitor elements are arranged along the protruding direction while directing the protruding directions of the anode portion from the anode body in directions opposite to each other.   5. The decoupling device according to claim 4, wherein the first and second capacitor elements have the anode portion protruding from the anode body in the same direction. 6.   The resin layer which covers the said 1st and 2nd capacitor | condenser element further is provided, The anode part of the said 1st and 2nd capacitor | condenser element is electrically insulated from each other by this resin layer. The decoupling device according to any one of the above.   The decoupling according to any one of claims 1 to 8, 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. A decoupling device according to any one of claims 1 to 9,
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 to the power supply circuit, and the second power supply line is connected to the power supply circuit and extends from the power supply circuit to the load circuit. The ground line is connected to the ground,
The pair of anode terminals of the decoupling device are 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   The pair of anode terminals of the decoupling device includes one end of the first power line and the first terminal so that the first capacitor element is located on the load circuit side and the second capacitor element is located on the power circuit side. The mounting body according to claim 10, connected to one end of the two power supply lines.

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