JP2015012690A - Power supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply system in which an electrolytic capacitor weak in heat and having a shorter life in comparison with the other component is protected from heat and then replacement is facilitated.SOLUTION: A power supply system is provided which is characterized in that input-side and output-side electrolytic capacitors for removing or reducing noises of a power supply are fixed to one capacitor substrate separated and independent from the substrate on which the power supply is mounted, and then the mounting surface of the substrate on which the electrolytic capacitor is mounted is detachably connected so as to be upside down with respect to the substrate on which the power supply is mounted.

Description

  The present invention relates to a power supply system that protects an electrolytic capacitor that is weak against heat and has a short life compared with other components from heat and facilitates replacement thereof. In the present invention, the input side and output side electrolytic capacitors for removing or reducing the noise of the power source are fixed on a single capacitor substrate separated from the substrate to which the power source is attached, and the electrolytic capacitor is attached. The present invention relates to a power supply system in which a mounting surface of a substrate is detachably connected so that the mounting surface of the substrate on which a power source is mounted is opposite to the top and bottom.

  In the power supply system in the LAN type I / F unit, in addition to the power supply, an input side electrolytic capacitor for removing or reducing noise in the power supply input section and noise in the output section of the power supply are removed or reduced. An output side electrolytic capacitor is used. However, in general, an electrolytic capacitor is vulnerable to heat in a power supply system and has a shorter life compared to other components. Therefore, it is necessary to replace the entire board on which the electrolytic capacitor is mounted according to the life of the electrolytic capacitor. Alternatively, there was a problem that only the electrolytic capacitor had to be replaced after removing the substrate.

  For this reason, in recent years, as described in Japanese Patent Application Laid-Open No. 2003-81030 (Patent Document 1) and Japanese Patent Application Laid-Open No. 2005-203670 (Patent Document 2), the life is short in the power supply system and regularly. Install electrolytic capacitors that need to be replaced in a concentrated manner on another board that is prepared separately from the board on which the power supply is installed, and connect both boards with terminals or connectors to replace only the electrolytic capacitor. An easy power system has been developed.

  However, in the power supply system of the type in which the electrolytic capacitor is attached to a board separate from the board on which the power supply is mounted as described above, the wiring distance between the power supply and the electrolytic capacitor is increased. The capacitor has a problem that power supply noise cannot be sufficiently removed and reduced due to an increase in impedance.

  For this reason, in the power supply systems of the types described in Patent Documents 1 and 2, the electrolytic capacitor must be placed as close as possible to the power supply in order to suppress an increase in the impedance of the wiring between the power supply and the electrolytic capacitor. I had to. However, since the electrolytic capacitor is generally weak against heat, the electrolytic capacitor used in the power supply systems described in Patent Documents 1 and 2 is further deteriorated by receiving heat, and its life is extremely shortened. There was a problem.

JP 2003-81030 A JP 2005-203670 A

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a power supply system that protects an electrolytic capacitor that is weak against heat and has a short life compared to other components from heat and that can be easily replaced.

  As a result of intensive studies on the arrangement and wiring of electrolytic capacitors in the power supply system, the inventors fixed the electrolytic capacitor on a single capacitor substrate that is separate from the substrate on which the power source is attached, And so that the radiant heat generated from the power supply can reach the electrolytic capacitor directly, the mounting surface of the board to which the electrolytic capacitor is attached is turned upside down from the mounting surface of the board to which the power supply is attached. The present invention has been completed by detachably connecting to the device.

  Specifically, according to the present invention, a power source, an input-side electrolytic capacitor for removing or reducing noise in the input portion of the power source, and an output-side electrolysis for removing or reducing noise in the output portion of the power source A power supply system including a capacitor, wherein the power supply is fixed on a power supply board, and the input side electrolytic capacitor and the output side electrolytic capacitor are fixed on a single capacitor board separated from the power supply board, The capacitor board is detachably connected to the power supply board by a connector so that the surface of the capacitor board on which the electrolytic capacitor is attached is opposite to the surface of the power supply board on which the power supply is attached. A system is provided.

  In the present invention, the power source is fixed on the power supply substrate, and the input side electrolytic capacitor and the output side electrolytic capacitor are fixed on one capacitor substrate separated and independent from the power supply substrate. Electrolytic capacitors that need to be replaced regularly can be easily replaced by removing only the capacitor substrate without removing other components or the power supply substrate. Moreover, since the input side electrolytic capacitor and the output side electrolytic capacitor are mounted on one substrate, a plurality of electrolytic capacitors can be exchanged simultaneously. However, the capacitor substrate may be appropriately divided into a plurality of sheets so that the electrolytic capacitor can be replaced in units of electrolytic capacitors or groups.

  In addition, the connector is detachable mechanically, and if the connector can be attached / detached, the wiring on the power supply board and the wiring on the capacitor board can be electrically connected or disconnected. Known connectors, sockets, terminals, etc. can be used without limitation.

  In the present invention, the capacitor board is detachably connected to the power supply board via the connector and the connection terminal so that the surface of the capacitor board on which the electrolytic capacitor is attached is opposite to the surface on which the power supply of the power supply board is attached. The electrolytic capacitor is kept away from the power source as a heat source, and the surface portion of the electrolytic capacitor exposed to the power source can be substantially eliminated. As a result, the electrolytic capacitor is not substantially affected by the heat generated by the power source, and deterioration due to heat is prevented. In addition, the arrangement of the capacitor substrate facing upside down with respect to the power supply substrate simplifies the connection structure of the substrate and greatly contributes to the compactness of the power supply system.

  Further, in the present invention, when the capacitor board is attached to the power supply board, the capacitor board and / or the power supply board is arranged between the input side electrolytic capacitor and the output side electrolytic capacitor and the power supply board. Is preferred.

  The above configuration reliably blocks the radiant heat generated from the power source from reaching the electrolytic capacitor by the capacitor substrate and / or the power source substrate, so that the electrolytic capacitor can be reliably protected from the heat generated by the power source. It becomes possible.

  Capacitors can be broadly classified into electrolytic capacitors, film capacitors, solid capacitors, oil capacitors, etc., but the present invention aims to protect the capacitors from heat and facilitate their replacement. The capacitor can also be used.

  However, since the capacitor of the type that can most enjoy the benefits of the present invention is a relatively large capacitor that is vulnerable to heat and inconvenient to replace, an electrolytic capacitor is suitable for application to the present invention. Aluminum electrolytic cylindrical electrolytic capacitors are more suitable for application to the present invention.

  Another object of the present invention is to isolate the electrolytic capacitor from the power source, which is a heat source, and protect it from heat by devising the arrangement of the substrate. For this reason, the power source used in the present invention is usually a power source of a relatively large capacity, in which an electrolytic capacitor is used together for noise removal or reduction, and its calorific value is large. For this, a power supply having a specification of DC 88V or more is suitable. In particular, in the case of a power supply provided with heat radiation fins for heat radiation, a heat radiation place from the power supply can be specified, which makes it easy to isolate the electrolytic capacitor from the power source that is a heat source.

  In a power supply system in which a plurality of electrolytic capacitors are concentrated on a single board independent from the power supply board as in the present invention, compared to a conventional power supply system in which all components such as a power supply and an electrolytic capacitor are fixed on the same board. Therefore, the wiring distance (length) between the power supply and each electrolytic capacitor tends to increase, and the distance (length) between the wirings also tends to cause a difference in length.

  However, since the electrolytic capacitor used in the power supply system functions to remove or reduce the noise of the power supply, the impedance increases as the wiring distance (length) between the power supply and the electrolytic capacitor increases. Therefore, there is a problem that power supply noise cannot be sufficiently removed or reduced.

  In addition, as a measure for reducing the impedance of the wiring in the power supply system, it is known to select a metal having a low electrical resistance such as Au, shorten the length of the wiring, or increase the cross-sectional area of the wiring. ing. However, it is disadvantageous to select a metal with low electrical resistance such as Au, which is expensive. Further, shortening the wiring length is not an appropriate measure because there is a physical limit in the present invention.

  Furthermore, in recent power supply systems, products have been downsized, enhanced in performance, and enhanced in functionality, and with the increase in the number of components, it is required to increase the density of component mounting on a board. For this reason, it is not preferable to widen the width of the wiring on the substrate to increase its cross-sectional area because it takes up the component mounting space on the substrate and hinders the density of component mounting.

  Therefore, in the present invention, the wiring on the capacitor substrate and / or the wiring on the power supply substrate connected to the electrolytic capacitor is disposed on the front and back surfaces of the capacitor substrate and / or on the front and back surfaces of the power supply substrate, Without substantially increasing the width of the wiring on each substrate, the cross-sectional area of the wiring is increased, and the impedance is reduced.

  In addition, in a power supply system in which a power supply board to which a power supply is attached and a capacitor board to which an electrolytic capacitor is attached are detachably separated as in the present invention, the impedance is also increased by a connector connecting the power supply board and the capacitor board. There's a problem. Therefore, when the connector is of a type that achieves electrical connection with connection pins provided in the connector, it is preferable that four or more connection pins of the connector are provided per wiring.

  According to the present invention, the power supply is fixed on the power supply board, and the input side and output side electrolytic capacitors are fixed on one capacitor board separated and independent from the power supply board. It is possible to easily replace the capacitor board by removing only the capacitor board without removing the power board. In addition, since the input side and output side electrolytic capacitors are mounted on the same substrate, there is an effect that a plurality of electrolytic capacitors can be exchanged at a time.

  According to the present invention, the capacitor board is detachably connected to the power supply board via the connector or the connection terminal so that the surface of the capacitor board on which the electrolytic capacitor is attached is opposite to the surface on which the power supply of the power supply board is installed. Therefore, the electrolytic capacitor is kept away from the power source that is the heat source, and the radiant heat emitted from the power source is blocked by the capacitor substrate and / or the power source substrate, so that the electrolytic capacitor can be reliably protected from the heat generated by the power source. It becomes. As a result, the life of the electrolytic capacitor is extended.

  According to the present invention, a power supply board to which a power supply is attached and a capacitor board to which an electrolytic capacitor is attached are separated by the arrangement of wiring using the front and back surfaces of the circuit board and the use of a connector having four or more connection pins. Impedance reduction is also realized in the power supply system. As a result, the electrolytic capacitor used in the present invention can sufficiently or stably remove or reduce the noise of the power source without attaching the electrolytic capacitor in the immediate vicinity of the power source.

1 is a circuit diagram of a power supply system according to an embodiment of the present invention. It is a perspective view of the power supply system concerning one embodiment of the present invention in the state where the electrolytic capacitor board was attached. It is the (a) top view, (b) front view, and (c) side view of the power supply system which concerns on one Embodiment of this invention of the state which attached the electrolytic capacitor board | substrate. It is a circuit diagram of the power supply system of a prior art example. It is a perspective view of the power supply system of a prior art example. It is the (a) top view, (b) front view, and (c) side view of the power supply system of a prior art example.

  Hereinafter, a power supply system according to an embodiment of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the examples shown below, and various modifications can be made without departing from the technical idea of the present invention.

  FIG. 1 shows a circuit diagram of a power supply system 1 according to an embodiment of the present invention, and FIG. 4 shows a circuit diagram of a conventional power supply system 10. 2 is a perspective view of the power supply system 1 of the present embodiment in which some components are omitted, and FIG. 5 is a perspective view of a conventional power supply system 10 in which some components are omitted. It is shown. Further, FIG. 3 shows (a) a top view, (b) a front view and (c) a side view of the power supply system 1 of this embodiment, and FIG. a) top view, (b) front view and (c) side view are shown. However, FIGS. 5 and 6 show two circuit components of the power supply system 1 of the conventional example shown in FIG. Moreover, in FIGS. 1-6, about the components which are common in the power supply system 10 of a prior art example among the components of the power supply system 1 of a present Example, the same code | symbol is attached | subjected and represented.

  As can be understood with reference to FIGS. 1 and 4, the power supply system 1 of the present embodiment and the power supply system 10 of the conventional example mainly include an input power supply connector 11, a filter circuit 12, and a power supply 2 (DC / DC converter, 110V / 24V), an output for removing or reducing noise at the input side of the aluminum electrolytic cylindrical electrolytic capacitor 3 and ceramic capacitor 13 for removing or reducing noise at the input portion of the power source 2. This is composed of cylindrical electrolytic capacitors 4a and 4b, aluminum capacitors on the side, ceramic capacitor 14, and load connector 15.

  In the power supply system 10 of the conventional example, as shown in FIGS. 4 to 6, all components are mounted on the same power supply board 5.

  Therefore, in the power supply system 10 of the conventional example, when it is necessary to replace the input side cylindrical electrolytic capacitor 3 or the output side cylindrical electrolytic capacitors 4a and 4b, the power supply board 5 is connected to the LAN type I / F unit (not shown). It is necessary to replace the input-side cylindrical electrolytic capacitor 3 or the output-side cylindrical electrolytic capacitors 4a and 4b with each other, or replace the power supply board 5 together.

  On the other hand, in the power supply system 1 of the present embodiment, as shown in FIGS. 1 to 3, the input power supply connector 11, the filter circuit 12, the power supply 2, the input side ceramic capacitor 13, the output side ceramic capacitor 14, and the load The connector 15 is mounted on the same power supply board 5, and the input side cylindrical electrolytic capacitor 3 and the output side cylindrical electrolytic capacitors 4a and 4b, which are weak against heat and have a shorter life than other parts, are separated and independent from the power supply board 5. It is mounted on the capacitor substrate 6. The capacitor substrate 6 is detachably connected to the power supply substrate 5 via the connector 7.

  For this reason, in the power supply system 1 of the present embodiment, the input side cylindrical electrolytic capacitor 3 or the output side cylindrical electrolytic capacitors 4a and 4b, the other components 11 to 15 and the power supply board 5 are connected to a LAN type I / F unit (not shown). It is possible to easily replace the capacitor substrate 6 by removing only the capacitor substrate 6 without removing the capacitor substrate 6). Further, in the power supply system 1 of the present embodiment, the input side electrolytic capacitor 3 and the output side electrolytic capacitors 4a and 4b are mounted on one capacitor substrate 6, so that only the capacitor substrate 6 is exchanged to input at once. The side electrolytic capacitor 3 and the output side electrolytic capacitors 4a and 4b can be exchanged.

  Next, as understood with reference to FIG. 2 and FIG. 3B, in the power supply system 1 of this embodiment, the input side cylindrical electrolytic capacitor 3 and the output side cylindrical electrolytic capacitors 4a and 4b are attached. The capacitor substrate 6 is detachably connected to the power supply substrate 5 via the connector 7 so that the attachment surface 61 of the capacitor substrate 6 is opposite to the attachment surface 51 of the power supply substrate 5 to which the power supply 2 is attached. . Further, between the heat radiation fin 21 of the power source 2 and the input side cylindrical electrolytic capacitor 3 and the output side cylindrical electrolytic capacitors 4a and 4b, the capacitor substrate 6 and the power source substrate 5 are provided so as to block the space between them. Are arranged (see FIG. 3).

  Therefore, in this embodiment, the surface of the input side cylindrical electrolytic capacitor 3 and the output side cylindrical electrolytic capacitors 4a and 4b are kept away from the power source 2 as a heat source, and further, the surface of the input side cylindrical electrolytic capacitor 3 and the output side. The surfaces of the cylindrical electrolytic capacitors 4a and 4b are not directly exposed toward the heat radiating fins 21 of the power source 2. Further, the radiant heat generated by the heat radiation fins 21 of the power source 2 is not blocked by the capacitor substrate 6 and the power source substrate 5 and reaches the input side cylindrical electrolytic capacitor 3 and the output side cylindrical electrolytic capacitors 4a and 4b. The input side cylindrical electrolytic capacitor 3 and the output side cylindrical electrolytic capacitors 4a and 4b are reliably isolated and protected from the heat generated by the power source 2. As a result, the surface of the input side cylindrical electrolytic capacitor 3 and the output side cylindrical electrolytic capacitor are protected. The lifetime of the capacitors 4a and 4b is extended.

  In general, the power supply 2 is provided with heat radiation fins 21 for releasing heat, as shown in FIG. 3B, so that the power supply board 5 can be turned upside down as in the present embodiment. The arrangement of the capacitor substrate 6 with the reverse direction makes it possible to dispose the input side cylindrical electrolytic capacitor 3 and the output side cylindrical electrolytic capacitors 4 a and 4 b below the heat radiation fins 21 of the power supply 2. For this reason, the arrangement of the capacitor substrate 6 with the top and bottom reversed with respect to the power supply substrate 5 is such that the input-side cylindrical electrolytic capacitor 3 and the output-side cylindrical electrolytic capacitors 4a and 4b are heated by the radiation fins 21 of the power supply 2. It effectively prevents being heated by gas (updraft).

  As a result, in this embodiment, the input side cylindrical electrolytic capacitor 3 and the output side cylindrical electrolytic capacitors 4a and 4b are not substantially affected by the heat generated by the power supply 2, and each cylindrical electrolysis due to heat is performed. Deterioration of the capacitors 3 and 4a, 4b is effectively prevented. Further, as in the present embodiment, the arrangement of the capacitor substrate 6 with the top and bottom reversed with respect to the power supply substrate 5 greatly contributes to the simplification of the connection structure of the substrates 5 and 6 and the compactness of the power supply system 1.

  The present invention aims at protecting the capacitor from heat and facilitating its replacement. Therefore, in addition to the electrolytic capacitors 3 and 4a and 4b, other types such as a film capacitor, a solid capacitor, and an oil capacitor are used. Capacitors can also be used. However, in this embodiment, the cylindrical electrolytic capacitors 3 and 4a, 4b having a relatively large aluminum exterior that is particularly vulnerable to heat and inconvenient to replace are used.

  Next, in the power supply system 1 of this embodiment, the input side cylindrical electrolytic capacitor 3 and the output side cylindrical electrolytic capacitors 4a and 4b are concentrated on the single capacitor substrate 6, and the power supply 2 and each electrolytic capacitor. In order to suppress an increase in wiring distance (length) between 3 and 4a, 4b and an increase in impedance, although not shown, wiring connected to cylindrical electrolytic capacitors 3 and 4a, 4b is arranged on the surface of capacitor substrate 6. The number of connection pins provided on the back surface and further provided in the connector 7 is four or more per wiring.

  As a result, the power supply system 1 of the present embodiment can obtain a stable and sufficient power supply noise removal effect or reduction effect by the input side cylindrical electrolytic capacitor 3 and the output side cylindrical electrolytic capacitors 4a and 4b. In particular, the arrangement of the wiring connected to the electrolytic capacitors 3 and 4a, 4b on the front and back surfaces of the capacitor substrate 6 significantly reduces the impedance of the wiring without substantially increasing the width of the wiring. This greatly contributes to increasing the density of mounting parts and miniaturizing the power supply system.

  The connector 7 used in the power supply system 1 of this embodiment is mechanically detachable, and the connector 7 is attached and detached to electrically connect the wiring on the power supply substrate 5 and the wiring on the capacitor substrate 6. Any known connector, socket, terminal, or the like can be used as long as it can be connected or disconnected.

1... Power supply system of this embodiment 11... Input power connector 12... Filter circuit 13. ··· Output side ceramic capacitor 15 ··· Load connector 2 ······ Power supply 21 ··· Radiation fin 3 ····· Input side electrolytic capacitor 4a, 4b · · · ..Electrolytic capacitor on output side 5 .... Power supply board 51 ... Power supply mounting surface of power supply board 6 .... Capacitor board 61 ... Capacitor on capacitor board Mounting surface 7 ·································· 10

Claims (6)

A power supply system comprising a power supply, an input-side electrolytic capacitor for removing or reducing noise in the input section of the power supply, and an output-side electrolytic capacitor for removing or reducing noise in the output section of the power supply ,
The power source is fixed on a power board,
The input-side electrolytic capacitor and the output-side electrolytic capacitor are fixed on a single capacitor substrate separated and independent from the power supply substrate, and the capacitor substrate has a surface on which the electrolytic capacitor is attached to the capacitor substrate. A power supply system, wherein the power supply board is detachably connected to the power supply board by a connector so as to face upside down with respect to a surface of the power supply board on which the power supply is attached.   When the capacitor board is attached to the power supply board, the capacitor board and / or the power supply board is disposed between the input side electrolytic capacitor and the output side electrolytic capacitor and the power supply board. The power supply system according to claim 2.   The wiring from the connector to the input-side electrolytic capacitor and / or the wiring from the connector to the output-side electrolytic capacitor is provided on the front and back surfaces of the capacitor substrate. The described power supply system.   4. The electrical connection of the connector is achieved by connection pins arranged in the connector, and four or more connection pins are arranged per wiring. The power supply system according to.   The power supply system according to any one of claims 1 to 4, wherein the power supply is a power supply having a specification of DC 88V or more.   6. The power supply system according to claim 1, wherein the electrolytic capacitor is a cylindrical electrolytic capacitor with an aluminum exterior.

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