JP2014203979A - Power source device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid an increase in production cost while enabling a mounting tool to be positioned to a fixing part such as a case.SOLUTION: A power source device comprises: a rectifier diode 2 and a switching element 3, as electronic components mounted on a circuit substrate 4 while the rear face of a body with mounting holes 11, 12 formed therein is located on an imaginary surface; a side plate 5b having a surface S3 with which the rear faces of the electronic components 2, 3 are in contact each other; and a mounting tool 6 abutting on the fronts S1, S2 of the electronic components 2, 3 and disposed such that the rear faces of the electronic components 2, 3 are in firm contact with the surface S3 of the side plate 5b. The mounting tool 6 has projections 15, 16 on its plate face abutting on the front faces S1, S2 of the electronic components 2, 3. Each projection part 15, 16 is disposed so as to be inserted into the mounting hole 11, 12 of the electronic component 2, 3. The side plate 5b and mounting tool 6, in opposite positions without sandwiching either the electronic component 2 or 3, are mutually fixed by a fixing screw 7 screwed in a female screw hole 14, formed in the mounting tool 6, through an insertion hole 13 formed in the side plate 5b.

Description

  The present invention relates to a power supply device configured by attaching a heat generating component such as a transistor to a fixed portion such as a heat sink.

  As this type of power supply device, a power supply device disclosed in Patent Document 1 below is known. This power supply device includes a heat generating component, a printed circuit board, a case, and an attachment (attachment plate). The heat generating component is an electronic component that generates heat, such as a switch element (a transistor or a diode) used in the power supply device, and is mounted on a printed board together with other electronic components. The plurality of heat generating components are mounted in a standing state in parallel along one side of the printed circuit board.

  The case houses the heat generating component and the printed circuit board. Further, the side plate which is one of the side plates of the case and is located along the one side of the printed circuit board on which the plurality of heat generating components are mounted is used as a fixing portion to which the plurality of heat generating components are fixed. Function. The side plate is formed with a screw insertion hole through which a screw to be screwed into a screw hole described later formed in the fixture is inserted. The side plate of the case is formed with at least a pair of positioning holes into which positioning protrusions protruding from the fixture are fitted.

  As an example, the fixture includes a pair of pressing portions formed of a pair of portions extending along one direction of flat plate portions formed in a cross shape, and the other direction orthogonal to the one direction. The other pair of portions extending along the line has a pair of projecting pieces formed by bending at right angles in the same direction. In addition, positioning protrusions that protrude along the extending direction of the protruding pieces are formed at the respective ends of the pair of protruding pieces. In addition, the length (projection amount) from the pair of pressing portions of the pair of projecting pieces is defined to be the same length as the thickness of the heat generating component in the pressing direction or a slightly shorter length. Moreover, the screw hole in which the screw for attaching a fixture to the said side plate of a case is screwed in the cross | intersection site | part of a pair of press part and a pair of protrusion in a fixture.

  In this power supply device, first, a printed circuit board on which an electronic component including a heat generating component is mounted is accommodated in a case, and the back surface of the heat generating component is brought close to the above-described side plate of the case. Next, the positioning protrusion is inserted into the positioning hole formed in the side plate while the pressing part is opposed to the heat generating component. Subsequently, while pushing the fixture toward the side plate, a screw is passed through the screw insertion hole from the outside of the side plate and screwed into (threaded into) the screw hole of the fixture, thereby drawing the fixture toward the side plate. As a result, since the heat generating component is pressed against the side plate of the case by the pair of pressing portions of the fixture, the side plate of the case functioning as the fixing portion is maintained in good adhesion with the side plate. It is fixed with.

Japanese Utility Model Publication No. 1-145193 (page 5-8, FIG. 1)

  However, the above power supply apparatus has the following problems to be solved. That is, in the power supply device described above, positioning of the mounting plate, which is a mounting tool, to the side plate of the case can be easily performed, but for positioning to insert the positioning protrusion of the mounting tool in addition to the screw insertion hole. It is necessary to form a hole in the side plate of the case. In addition to the pair of pressing portions, the fixture also needs to be formed with a pair of protrusions from which the positioning protrusions protrude from the tip. Needs to be bent at right angles to the pair of pressing portions. Therefore, this power supply device has a problem to be solved that increases the cost of processing the case and the fixture, resulting in an increase in product cost.

  The present invention has been made to solve such a problem, and it is a main object of the present invention to provide a power supply device capable of avoiding an increase in product cost while enabling positioning of a fixture to a fixing portion such as a case. And

  In order to achieve the above object, a power supply device according to the present invention is formed in a row on a circuit board in a state where a mounting hole is formed through the main body from the front surface to the rear surface and the rear surface of the main body is positioned on a common virtual plane. A plurality of electronic components mounted side by side, a fixing portion having a surface against which the back surface of the plurality of electronic components abuts, and the back surface of the plurality of electronic components abutting against the front surface of the plurality of electronic components A flat plate-shaped fixture disposed so as to be in pressure contact with the surface of the fixed portion, and the fixture has at least two protrusions on a plate surface of the plurality of electronic components on the side in contact with the front surface And the protrusion is disposed so as to be inserted into the mounting holes of at least two electronic components of the plurality of electronic components, and the fixing portion and the fixture include the plurality of electronic components. Out of In a position facing the electronic component without slipping, it passes through an insertion hole formed in one of the fixed portion and the fixture, and a female screw hole formed in the other of the fixed portion and the fixture. They are fixed to each other by screwed fixing screws.

  In the power supply device according to the present invention, the protrusion is formed by extrusion.

  According to the power supply device of the present invention, since the protrusions that are inserted into at least two of the mounting holes of the plurality of electronic components are formed in the mounting tool, the plurality of electronic components are fixed by the mounting tool. When the fixture is inserted into the mounting holes of the electronic component, the fixture is simply brought into contact with the front surface of the plurality of electronic components. Positioning can be performed reliably and easily. Further, according to this power supply apparatus, unlike the conventional fixture described in the background art, the fixture need only be formed in a flat plate shape on which the protrusion is formed, and the fixture for the fixture. Since it is not necessary to form a positioning hole, the processing cost of the fixing portion and the fixture can be kept low, and an increase in product cost can be avoided.

  In the power supply device of the present invention, since the plurality of protrusions are formed by extrusion processing, the outer diameter on the base side is slightly smaller than the inner diameter of the mounting hole to be inserted, and from the base to the tip The protrusion can be easily formed on the cylindrical body whose outer diameter is gradually reduced toward the tip. Therefore, according to this power supply device, by forming a plurality of protrusions in such a shape, each protrusion can be easily inserted into each mounting hole, and in the inserted state, each protrusion Since the base part of the fitting part fits with the inner surface of the corresponding attachment hole with little rattling, the fixture can be positioned on the fixing part with very little rattling against the fixing part.

FIG. 3 is an enlarged view of a main part in the vicinity of a rectifier diode 2 and a switch element 3 as an example of a heat generating component in the power supply device 1. It is a front view of the fixture 6. It is a top view of the fixture 6. FIG. It is sectional drawing of the fixture 6 along the W1-W1 line | wire (line which passes the internal thread hole 14 and each projection part 15 and 16) of FIG. It is explanatory drawing for demonstrating the fixation structure to the side plate 5b of the case 5 of the rectifier diode 2 and the switch element 3. FIG. FIG. 2 is a cross-sectional view taken along a line W2-W2 (a line passing through the female screw hole 14 and each of the protrusions 15 and 16) in FIG.

  Hereinafter, embodiments of a power supply device will be described with reference to the drawings.

  As shown in FIG. 1, the power supply device 1 includes a terminal block, a resistor, a capacitor, a coil, a control IC (none of which is shown), a rectifier diode 2 and a switch element 3 (for example, a bipolar transistor or an electric field). A plurality of electronic components such as an effect transistor), a circuit board 4 on which these electronic components are mounted, a case 5 made of a metal material (made of aluminum as an example) for housing the circuit board 4, a fixture 6, A fixing screw 7 is provided.

  The circuit board 4 is screwed to the bottom plate 5a of the case 5 with an insulating spacer (not shown) interposed therebetween. Further, one edge 4a side of the circuit board 4 along the side plate 5b of the case 5 formed by being bent at a right angle with respect to the bottom plate 5a generates heat particularly in the operation state of the plurality of electronic components. A plurality of electronic components (hereinafter also referred to as heat generating components. In this example, as an example, two electronic components of the rectifier diode 2 and the switch element 3) are arranged in a line at intervals along the edge 4a. Has been implemented.

  The heat generating components such as the rectifier diode 2 and the switch element 3 are usually fixed to the fixing portion with a heat radiating plate formed of a material having excellent thermal conductivity (for example, a metal material such as aluminum) as a fixing portion. As a result, temperature rise due to heat generation is suppressed. In this example, since the case 5 is made of a metal material having excellent thermal conductivity, the rectifier diode 2 and the switch element 3 are fixed to the side plate 5b of the case 5 using the fixture 6 and the fixing screw 7. Thus, a configuration is adopted in which the side plate 5b functions as a common fixing portion (one fixing portion) for the rectifier diode 2 and the switch element 3. That is, a configuration is adopted in which heat generated by the rectifier diode 2 and the switch element 3 is radiated from the side plate 5b.

  The fixing structure for fixing the rectifier diode 2 and the switch element 3 to the side plate 5b will be specifically described together with the specific structure of each member.

  First, the two rectifier diodes 2 and the switch element 3 which are heat generating components will be described. As shown in FIG. 5, the rectifier diode 2 and the switch element 3 include, for example, mounting holes 11 penetrating from the front surfaces S1 and S2 of the main body (portion excluding terminals) such as the TO3P package, the TO220 package, and the TO247 package to the back surface. 12 is formed and a heat sink is integrated on the back side. The package of these heat generating components may be a package in which a heat sink is integrated on the back side, or may be a full mold package in which the back side is also covered with a resin.

  Further, as shown in FIG. 6, the rectifier diode 2 and the switch element 3 are in a state in which the rear surfaces B1 and B2 face the side plate 5b and are located on the common virtual plane PL, and the mounting holes 11, The 12 circuit boards 4 are mounted on the circuit board 4 so that their heights are substantially equal. Further, the position of the side plate 5b of the case 5 with respect to the circuit board 4 is defined so that the surface S3 on the rectifier diode 2 and switch element 3 side is positioned on the virtual plane PL. With this configuration, the back surface B1 of the rectifier diode 2 and the back surface B2 of the switch element 3 are in contact (contact) with the surface S3 of the side plate 5b.

  Next, the fixture 6 will be described. As shown in FIGS. 1 to 5, the fixture 6 is configured by a plate body (in this example, a metal plate body as an example) formed in a rectangular shape in front view. As shown in FIGS. 5 and 6, the fixture 6 has a front surface S1 of the rectifier diode 2 on the side plate 5b side of the portion C1 on one end side (in this example, the attachment of the entire front surface of the rectifier diode 2). The plate surface on the side plate 5b side of the other end portion C2 contacts the front surface S2 of the switch element 3 (the front surface including the portion including the hole 11 (the upper portion in FIG. 5)). In the example, the switch element 3 is configured to come into contact with a part of the entire front surface of the switch element 3 (a part of the front surface including the portion where the mounting hole 12 is formed (the upper portion in FIG. 5)).

  Moreover, as shown in FIGS. 2-6, the fixture 6 has the two projection parts 15 and 16 in said board surface in the site | part C1, and said board surface in the site | part C2. Specifically, the protruding portion 15 is disposed so as to be inserted into the mounting hole 11 at a position facing the mounting hole 11 of the rectifier diode 2 in the part C1. Further, the protruding portion 16 is disposed so as to be inserted into the mounting hole 12 at a position facing the mounting hole 12 of the switch element 3 in the part C2.

  In addition, since the mounting holes 11 and 12 formed in the rectifier diode 2 and the switch element 3 have a generally planar shape, the protrusions 15 and 16 have the same planar shape as the mounting holes 11 and 12. In addition, it is formed in a bottomed cylindrical body. Specifically, as shown in FIG. 6, the protrusions 15 and 16 are formed to have a slightly smaller diameter than the inner diameter of the mounting holes 11 and 12 corresponding to the outer diameter on the base side. The outer diameter from the base portion to the tip portion is formed into a cylindrical body that gradually decreases toward the tip portion. Further, the protruding lengths of the protrusions 15 and 16 are defined to be shorter than the lengths of the mounting holes 11 and 12. In this example, since the fixture 6 adopts a configuration in which the protrusions 15 and 16 are simply formed by extrusion (pressing) as an example, FIGS. As shown in the figure, the back side of each of the projections 15 and 16 in the fixture 6 is formed as a recess.

  Next, the structure for attaching the fixture 6 to the side plate 5b will be described. One member of the side plate 5b and the fixture 6 (in this example, as an example, the side plate 5b) without sandwiching both the rectifier diode 2 and the switch element 3 (in this example, as an example, the fixture 6). 5, specifically, as shown in FIG. 5, a portion located between the portion D1 that contacts the rectifier diode 2 and the portion D2 that contacts the switch element 3 (which corresponds to the rectifier diode 2 and the switch element 3). An insertion hole 13 is formed in a portion D3) that does not contact. In this example, as an example, the insertion hole 13 is formed at an intermediate position between the attachment hole 11 of the rectifier diode 2 and the attachment hole 12 of the switch element 3 in the part D3.

  Moreover, the part facing the one member (side plate 5b) without sandwiching any of the rectifier diode 2 and the switch element 3 in the other member (mounting tool 6) of the side plate 5b and the fitting 6, specifically, As shown in FIGS. 2 to 6, the part located between the part C1 that contacts the rectifier diode 2 and the part C2 that contacts the switch element 3 (part C3 that does not contact the rectifier diode 2 and the switch element 3) A female screw hole 14 to be screwed with the fixing screw 7 is formed. In this example, as an example, the female screw hole 14 is formed in a portion that is located in the middle of the protrusions 15 and 16 in the portion C3 and that is opposed to the insertion hole 13, as shown in FIGS. ing.

  With this configuration, as shown in FIGS. 1 and 6, the part C <b> 1 on one end side contacts the front surface S <b> 1 of the rectifier diode 2, the protrusion 15 enters the mounting hole 11 of the rectifier diode 2, and the part C <b> 2 on the other end side. In contact with the front surface S2 of the switch element 3 and the protrusion 16 entering the mounting hole 12 of the switch element 3, the fixture 6 is brought into contact (contacted) with the rectifier diode 2 and the switch element 3, thereby The female screw hole 14 formed in 6 is automatically positioned so as to face the insertion hole 13 formed in the side plate 5b.

  Thus, in the power supply device 1, the distal end side of the fixing screw 7 is securely inserted into the female screw hole 14 of the fixture 6 by inserting the distal end side of the fixing screw 7 from the outside of the case 5 into the insertion hole 13 of the side plate 5 b. The side plate 5b and the fixture 6 can be connected to one of the side plate 5b and the fixture 6 at positions facing each other without sandwiching either the rectifier diode 2 or the switch element 3 (this In the example, they can be fixed to each other by a fixing screw 7 that passes through the insertion hole 13 formed in the side plate 5b) and is screwed into the female screw hole 14 formed in the other (the attachment 6 in this example). Yes. The insertion direction of the fixing screw 7 into the insertion hole 13 is reversed instead of the above-described configuration in which the insertion hole 13 is formed in the side plate 5b and the female screw hole 14 is formed in the fixture 6. A configuration in which the hole 14 is formed and the insertion hole 13 is formed in the fixture 6 may be employed.

  Further, the fixture 6 is pulled toward the side plate 5b and attached to the side plate 5b by rotating the fixing screw 7 so as to be screwed into the female screw hole 14. With this configuration, the back surface B1 and B2 of the rectifier diode 2 and the switch element 3 are fixed to the side plate 5b by being pressed against the surface S3 of the side plate 5b by the fixture 6 attached to the side plate 5b. In this power supply device 1, since the protrusions 15 and 16 are engaged with the attachment holes 11 and 12 of the rectifier diode 2 and the switch element 3, the attachment 6 rotates as the fixing screw 7 rotates. The occurrence of the situation is reliably prevented.

  Thus, in this power supply device 1, the rectifier diode 2 is attached to the fixture 6 that abuts against the front surfaces S 1 and S 2 of the rectifier diode 2 and the switch element 3 and presses the back surface thereof to the surface S 3 of the side plate 5 b. A protrusion 15 to be inserted into the hole 11 and a protrusion 16 to be inserted into the mounting hole 12 of the switch element 3 are formed. Further, a part of one member of the side plate 5b and the fixture 6 that faces the other member without sandwiching the rectifier diode 2 and the switch element 3 (when one member is the side plate 5b, the part D3, the fixture 6 In this case, the insertion hole 13 is formed in the portion C3), and the portion facing the one member (the other) without sandwiching the rectifier diode 2 and the switch element 3 in the other member of the side plate 5b and the fixture 6 A female screw hole 14 is formed facing the insertion hole 13 in the part C3 when the member is the fixture 6 and in the part D3) when the member is the side plate 5b.

  Therefore, according to the power supply device 1, when the rectifier diode 2 and the switch element 3 are fixed to the side plate 5 b with the fixture 6, the protrusion 15 is inserted into the corresponding attachment hole 11 of the rectifier diode 2, and the protrusion 16 Is inserted into the mounting hole 12 of the corresponding switch element 3, and the positioning of the mounting tool 6 with respect to the side plate 5 b, i.e., the side plate, is performed simply by bringing the mounting tool 6 into contact with the front surfaces S 1 and S 2 of the rectifier diode 2 and the switching element 3. Positioning of the female screw hole 14 of the fixture 6 with respect to the insertion hole 13 of 5b can be performed reliably and easily. Further, according to the power supply device 1, the fixture 6 is different from the conventional fixture described in the background art, and has a flat plate shape in which the protrusions 15 and 16 are formed at positions corresponding to the mounting holes 11 and 12. Since it is not necessary to form a positioning hole for the fixture 6 in the side plate 5b as a fixing portion, the processing cost of the case 5 and the fixture 6 can be kept low. An increase in cost can be avoided.

  Moreover, in this power supply device 1, since each projection part 15 and 16 is the structure formed by extrusion processing, the shape is bottomed together with the planar shape of each attachment hole 11 and 12 of the rectifier diode 2 and the switch element 3 The outer diameter from the base to the tip is slightly smaller than the inner diameter of the mounting holes 11 and 12 on the base side, and the protrusion gradually decreases toward the tip. The portions 15 and 16 can be easily formed.

  Therefore, according to this power supply device 1, by forming the protrusions 15 and 16 in the shape as described above, the protrusions 15 and 16 can be easily inserted into the corresponding mounting holes 11 and 12, respectively. In the inserted state, the bases of the projections 15 and 16 are fitted with the inner surfaces of the corresponding mounting holes 11 and 12 with little wobbling, so that the side plate 5b is attached with very little wobbling. The tool 6 can be positioned on the side plate 5b.

  In the above example, since there are two heat generating components, the rectifier diode 2 and the switch element 3, which are fixed to the side plate 5 b using the fixture 6, the rectifier diode 2 and the switch element 3 that are all the heat generating components are attached. Although the protrusions 15 and 16 inserted into both the holes 11 and 12 are formed in the fixture 6, three or more heat generating components can be fixed to the side plate 5 b using the fixture 6. In this case, there are the same number (three or more) of mounting holes for the heat generating component, but a protrusion is formed at the position of the mounting tool 6 facing at least two of these mounting holes. . Thereby, also in the structure which fixes three or more heat-emitting components between the fixture 6 and the side plate 5b, positioning of the fixture 6 with respect to the side plate 5b can be performed reliably and easily.

  Moreover, in the structure which fixes three or more heat-emitting components to the side plate 5b using the fixture 6, the structure which forms a projection part in the position facing all the attachment holes formed in each of several heat-emitting components. Can also be adopted. By adopting this configuration, it is possible to position the fixture 6 with respect to the side plate 5b with higher accuracy when the fixture 6 is disposed in contact with each heat generating component.

  In the power supply device 1 described above, an example is described in which the side plate 5b of the case 5 is used as a fixing portion for the rectifying diode 2 and the switch element 3 as heat generating components, but instead of the side plate 5b, A heat sink mounted on the circuit board 4 together with the rectifier diode 2 and the switch element 3 can also be used as a fixed portion.

DESCRIPTION OF SYMBOLS 1 Power supply device 2 Rectifier diode 3 Switch element 5 Case 5b Side plate 6 Mounting tool 7 Fixing screw 11,12 Mounting hole 13 Insertion hole 14 Female screw hole 15,16 Projection part C3, D3 part S3 surface

Claims (2)

A plurality of electronic components mounted in a line on the circuit board in a state where a mounting hole penetrating from the front surface of the main body to the back surface is formed and the back surface of the main body is positioned on a common virtual plane;
A fixing portion having a surface with which the back surface of the plurality of electronic components abuts;
A flat plate-shaped fixture disposed so as to abut against the front surface of the plurality of electronic components and to be in pressure contact with the back surface of the plurality of electronic components;
The fixture has at least two protrusions on a plate surface that contacts the front surface of the plurality of electronic components, and the protrusions have the attachment holes of at least two electronic components of the plurality of electronic components. Are arranged to be inserted respectively in
The fixing portion and the fixture pass through an insertion hole formed in one of the fixing portion and the fixture at a position facing each other without sandwiching any electronic component of the plurality of electronic components. A power supply device fixed to each other by a fixing screw screwed into a female screw hole formed on the other of the fixing portion and the fixture.   The power supply device according to claim 1, wherein the protrusion is formed by an extrusion process.

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