JP2011139002A - Electrical component mounting structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrical component mounting structure that facilitates attachment and detachment of a heat radiator without the need to provide a hole in a printed wiring board so as to mount the heat radiator. <P>SOLUTION: The electrical component mounting structure includes a power module 14 mounted on the printed wiring board 1, the heat radiator 16 disposed on a heat radiation surface of the power module so as to radiate heat of the power module, a mounting member 11 including a positioner 13 for positioning to the power module, and mounting the heat radiator on the power module, and a holder of holding the power module between the mounting member and heat radiator, the mounting member being interposed between the printed wiring board and power module. The mounting member and heat radiator are held by the holder to bring the power module and heat radiator into thermally excellent contact with each other without the need to provide a hole in the printed wiring board. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to an electrical component mounting structure for mounting a radiator to a power module mounted on a printed wiring board.

FIG. 10 shows a conventional electrical component mounting structure described in JP-A-10-267326. The power transistor module 102 is a DIP (Dual-Inline-Package) type and is mounted on the printed wiring board 101. The heat dissipation heat sink 105 is disposed on a heat dissipation base plate 103 provided on one surface of the power transistor module 102. The bolt 104 is inserted into a screw hole of the power transistor module 102 and screwed into the heat sink 105 to fix the heat sink 105 and the power transistor module 102. At this time, a hole is provided in the printed wiring board 101 and the bolt 104 is inserted into a screw hole of the power transistor module 102.

FIG. 11 shows another conventional electrical component mounting structure described in JP-A-8-86473. A power transistor module 106 of the SIP (Single-Inline-Package) type is disposed in an upright posture with respect to the mounting surface of the electrical components of the printed wiring board 107, and the heat sink 108 for heat dissipation is disposed on the heat sink mounting surface. When the heat sink 108 for heat dissipation is attached to the power transistor module 106, the weight cannot be supported by only one row of lead pins 109, and the lead pins 109 of the power transistor module 106 are not deformed or buckled. The power transistor module 106 and the heat radiating heat sink 108 are respectively screwed to the support 110 screwed.

JP-A-10-267326 JP-A-8-86473

In the electrical component mounting structure disclosed in Japanese Patent Laid-Open No. 10-267326, it is necessary to provide a hole in the printed wiring board 101 in order to insert the bolt 104 into the screw hole of the power transistor module 102. At this time, it is necessary to provide holes suitable for the number of screw holes included in the power transistor module 102, the dimensions of the screws, and the dimensions required in the mounting process. For this reason, there exists a problem that the wiring space on a printed wiring board reduces.

Further, the electrical component mounting structure disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 8-86473 requires a support 110 that is screwed to the printed wiring board 107 in order to support the power module 108. For this reason, it is necessary to provide the screw hole 111 in the printed wiring board 107, and there is a problem that the wiring space on the printed wiring board is reduced as in the above-mentioned JP-A-10-267326.

This invention pays attention to the above-mentioned problem, and it aims at providing the electrical equipment attachment structure which can attach or detach a heat radiator, without providing a hole in a printed wiring board.

In order to solve the above-mentioned problem, an electrical component mounting structure according to a first aspect of the present invention includes a power module mounted on a printed wiring board and a heat radiation surface of the power module for radiating heat of the power module. A radiator disposed on the power module, a positioning member for the power module, an attachment member for attaching the radiator to the power module, and a clamping means for clamping the power module between the attachment member and the radiator The mounting member is interposed between the printed wiring board and the power module.

An electrical component mounting structure according to a second aspect of the present invention is the electrical component mounting structure according to the first aspect of the present invention, wherein the clamping means includes a screw, a screw hole provided in the mounting member, and the radiator. The screw is inserted through the screw insertion hole, and is screwed into the screw hole through the power module.

An electrical component mounting structure according to a third aspect of the present invention is the electrical component mounting structure according to the first aspect of the present invention, wherein the clamping means is formed on a locking claw projecting from the mounting member and the radiator. The engaging claw is engaged with the engaging portion via the power module.

An electrical component mounting structure according to a fourth aspect of the present invention is the electrical component mounting structure according to the first to third aspects, wherein the positioning means is formed on the mounting member along a side surface of the power module. It consists of at least one ridge, and the power module is positioned in contact with the ridge.

The electrical component mounting structure according to claim 1 is a mounting structure in which the sandwiching means sandwiches the radiator, the power module, and the mounting member so that the radiator and the power module are in good thermal contact. It is not necessary to provide a hole necessary for fixing the device in the printed wiring board, and the wiring space is not limited.

In the electrical component mounting structure according to the second aspect, the screw is inserted from the screw insertion hole of the radiator and screwed into the screw hole of the mounting member via the power module, so that the radiator and the power module are heated. Therefore, it is not necessary to provide holes necessary for fixing the radiator in the printed wiring board, and the wiring space is not limited. In addition, since the screw can be detached from the radiator side, when the electrical components other than the radiator are accommodated in the electrical component box made of aluminum or the like, the radiator can be detached without disassembling the electrical component box. Further, it is possible to attach a refrigerant jacket without using a heat radiating plate, thereby reducing the product cost.

In the electrical component mounting structure according to the third aspect, the radiator and the power module are in good thermal contact with each other by engaging the engaging claw of the mounting member and the engaging portion of the radiator via the power module. Therefore, it is not necessary to provide a hole necessary for fixing the radiator in the printed wiring board, and the wiring layout is not limited. In addition, since the latching claw can be operated from the radiator side, if electrical components other than the radiator are housed in an electrical component box made of aluminum or the like, the radiator can be used without disassembling the electrical component box. Can be removed. Further, it is possible to attach a refrigerant jacket without using a heat radiating plate, thereby reducing the product cost.

In the electrical component mounting structure according to the fourth aspect, the mounting member includes at least one protrusion positioning means, so that the mounting member and the power module can be easily and accurately assembled in the manufacturing process, and the manufacturing efficiency can be improved. Leading to

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an assembled perspective view showing Embodiment 1 of an electrical component mounting structure according to the present invention. It is sectional drawing of Embodiment 1 of the electrical equipment attachment structure by this invention. It is an assembly perspective view which shows Embodiment 2 of the electrical equipment mounting structure by this invention. It is sectional drawing of Embodiment 2 of the electrical equipment attachment structure by this invention. It is a perspective view which shows the other attachment member of the electrical equipment attachment structure by this invention. It is a perspective view which shows the other attachment member of the electrical equipment attachment structure by this invention. It is an assembly perspective view which shows Embodiment 3 of the electrical equipment mounting structure by this invention. It is a perspective view which shows the other attachment member of the electrical equipment attachment structure by this invention. It is an assembly perspective view which shows Embodiment 4 of the electrical equipment mounting structure by this invention. It is sectional drawing which shows the electrical equipment attachment structure in the past. It is an assembly perspective view which shows the electrical equipment attachment structure in the past.

Hereinafter, the electronic component mounting structure of the present invention will be described in detail with reference to the illustrated embodiments. The power module is a diode module for an inverter device used for an air conditioner or the like, an IPM or the like, and is a DIP type. The lead terminals of the power module are mounted through holes on the printed wiring board. The radiator is a heat sink used to dissipate heat generated by the power module, and is installed so as to be in contact with the heat radiation surface of the power module. The radiator may be a refrigerant jacket. Further, an electronic circuit (wiring or the like) (not shown) is formed on the printed wiring board.

1 and 2 show Embodiment 1 of an electrical component mounting structure according to the present invention, wherein 1 is a printed wiring board, 11 is a mounting member, 14 is a power module, 16 is a radiator, and 18 is a screw.

The attachment member 11 is a plate-like body and includes screw holes 12 and positioning means 13. The mounting member 11 is made of a metal such as an aluminum alloy or stainless steel, and is bent along the side surface of the power module 14 to form the positioning means 13. The material of the mounting member 11 may be made of resin such as PP or ABS, and preferably has high heat resistance. In this case, the positioning means 13 is composed of protrusions and protrusions molded along the side surface of the power module 14. The position and size of the screw hole 12 are formed at a position and size suitable for the screw support means 15 of the power module 14.

The attachment member 11 is disposed between the printed wiring board 1 and the power module 14. The radiator 16 is disposed on the heat radiation surface 19 of the power module 14. The screw 18 is inserted into a screw insertion hole 17 provided in the radiator 16 and is screwed into the screw hole 12 provided in the attachment member 11 via the power module 14.

In the assembly process of the first embodiment, (1) the screw support means 15 included in the power module 14 and the screw holes 12 provided in the mounting member 11 are aligned with each other, and the side surface of the power module 14 is adjusted. They are combined so as to be inscribed in the positioning means 13 provided on the mounting member 11. The power module 14 and the attachment member 11 may be bonded in advance with an adhesive or the like. (2) The power module 14 is mounted on the printed wiring board 1 in a state where the power module 14 is combined with the mounting member 11. When the attachment member 11 is made of metal, the mounting is performed so that the attachment member 11 does not come into contact with the printed wiring board 1. (3) The heat radiator 16 is disposed on the heat radiation surface 19 of the power module 14. (4) The screw 18 is inserted into the screw insertion hole 17 provided in the radiator 16 and is engaged with the screw hole 12 in this order. Alternatively, the mounting member 11 may be inserted between the power module 14 and the printed wiring board 1 after the power module 14 is mounted on the printed wiring board 1.

In the electrical component mounting structure according to the first embodiment, the screw 18 is inserted into the screw insertion hole 17 provided in the radiator 16 without providing the printed wiring board 1 with a hole through which the radiator fixing screw 18 passes. The power module 14, the radiator 16, and the attachment member 11 are sandwiched by being screwed into the screw holes 12 of the attachment member 11 via the power module 14, and the power module 14 and the radiator 16 are in thermal contact. be able to. Therefore, the wiring space of the printed wiring board 1 is not limited. Further, since the position of the mounting member 11 can be determined so as to contact the positioning means 13 provided on the mounting member 11, the mounting member 11 and the power module 14 can be easily assembled, Positioning with the screw support means 15 and screwing into the screw hole 12 can be easily performed.

3 and 4 show Embodiment 2 of the electrical component mounting structure according to the present invention, 21 is a mounting member, and 27 is a radiator.

The attachment member 21 is a plate-like body made of resin such as PP or ABS, and includes a locking claw 22 and positioning means 23 at both ends thereof. The locking claw 22 is molded perpendicularly to the mounting member 21 so as to be inscribed in a side surface of the power module 14 that does not have a lead terminal. The positioning means 23 is provided so as to be fitted to the screw support means 15 provided in the power module 14. The radiator 26 includes an engaging portion 27 that engages with the locking claw 22.

The attachment member 21 is disposed between the printed wiring board 1 and the power module 14, and the radiator 16 is disposed on the heat radiation surface 19 of the power module 14. The locking claw 22 is engaged with an engaging portion 27 provided in the radiator 26 via the power module 14.

Here, when a gap is generated between the power module 14 and the radiator 26 due to an error in the component dimensions of the engaging claw 22 of the mounting member 21 and the engaging portion 27 of the radiator 26, the thermal conductivity is thereby reduced. By applying the heat radiation grease to the heat radiation surface 19 of the power module 14, the gap is filled and the decrease in thermal conductivity is improved.

In the assembly process of the second embodiment, (1) the power module 14 is combined with the mounting member 21. At this time, the screw support means 15 included in the power module 14 is combined with the positioning means 23 included in the mounting member 21. (2) The power module 14 is mounted on the printed wiring board 1 in a state where the power module 14 is combined with the mounting member 21. (3) The radiator 26 is arranged on the heat radiation surface 19 of the power module 14 so that the locking claw 22 provided on the attachment member 21 is engaged with the engagement portion 27 provided on the radiator 26. .

The engaging claw 22 provided on the attachment member 21 is engaged with the engagement portion 27 provided in the radiator 26 via the power module 14, and the power module 14, the radiator 26 and the attachment member 21 are sandwiched. The power module 14 and the radiator 26 can be in thermal contact. Therefore, it is not necessary to provide a hole for fixing the radiator 26 in the printed wiring board 1 and the wiring space of the printed wiring board 1 is not limited. By the positioning means 23 provided on the mounting member 21, the mounting member 21 is held in a predetermined direction and position with respect to the power module 14, and thereby the direction and position of the radiator 26 engaged with the mounting member 21 are also held. As a result, rattling of the radiator 26 can be prevented. Further, the positioning means 23 facilitates the assembly of the attachment member 21 and the power module 14 and the engagement with the radiator 26, leading to production efficiency.

The mounting member 21 may be a mounting member 51 including a locking claw 52 shown in FIG. 5, for example. The attachment member 51 is a plate-like body made of a resin such as PP or ABS, and includes positioning means 53 and two locking claws 52 at both ends thereof. The locking claw 52 is molded perpendicular to the mounting member 51 so as to be inscribed in the side surface of the power module 14 that does not include the lead terminal. The positioning means 53 is molded so as to be fitted to the screw support means 15 provided in the power module 14.

The engaging claw 52 engages with the engaging portion 27 of the radiator 26 via the power module 14, and the power module 14, the radiator 26, and the attachment member 51 are sandwiched, whereby the power module 14 and the radiator 26 are Can be in thermal contact. Therefore, it is not necessary to provide a hole for fixing the radiator 26 in the printed wiring board 1 and the wiring space of the printed wiring board 1 is not limited. By holding the direction and position of the mounting member 51 with respect to the power module 14 by the positioning means 53, the direction and position of the radiator 26 engaged with the mounting member 51 is maintained, and rattling of the radiator 26 is prevented. be able to. Further, the positioning means 53 facilitates the work of assembling the mounting member 51 and the power module 14 and engaging the radiator 26, leading to production efficiency.

Further, the attachment member 21 shown in the second embodiment may be the attachment member 41 including the locking claw 42 and the positioning means 43 shown in FIG. The attachment member 41 is a plate-like body made of resin such as PP or ABS, and has locking claws 42 at both ends thereof. The locking claw 42 is molded perpendicularly to the mounting member 41 so as to be inscribed in a side surface of the power module 14 that does not have a lead terminal. The positioning means 43 is composed of ridges projecting along the four corners of the power module 14.

The engaging claw 42 engages with the engaging portion 27 of the radiator 26 via the power module 14, and sandwiches the power module 14, the radiator 26, and the mounting member 41, so that the power module 14, the radiator 26, Will be in thermal contact. Therefore, it is not necessary to provide a hole for fixing the radiator 26 in the printed wiring board 1 and the wiring space of the printed wiring board 1 is not limited. By holding the direction and position of the mounting member 41 with respect to the power module 14 by the positioning means 43, the direction and position of the radiator 26 engaged with the mounting member 41 is maintained, and rattling of the radiator 26 is prevented. be able to. Further, the positioning means 43 facilitates the work of assembling the mounting member 41 and the power module 14 and engaging the radiator 26, leading to production efficiency.

FIG. 7 shows a third embodiment of the electrical component mounting structure according to the present invention, which is an electrical component mounting structure using the mounting member 31 provided with the positioning means 33.

The attachment member 31 is a plate-like body and includes screw holes 32 and positioning means 33. The material of the mounting member 31 is made of a metal such as aluminum alloy or stainless steel, and the positioning means 33 is formed by bending the terminal portion of the mounting member 31 to be inserted. The attachment member 31 may be made of resin such as PP or ABS, or may be positioning means 33 molded into a ridge.

The attachment member 31 is inserted between the printed wiring board 1 and the power module 14 mounted on the printed wiring board 1, and the radiator 16 is disposed on the heat radiation surface 19 of the power module 14. The screw 18 is inserted into a screw insertion hole 17 provided in the radiator 16 and is screwed into the screw hole 12 provided in the attachment member 11 via the power module 14.

In the assembly process of the third embodiment, (1) the power module 14 is mounted on the printed wiring board 1. At this time, a gap is provided between the printed wiring board 1 and the power module 14 so that the attachment member 31 can be inserted. (2) The positioning means 33 of the mounting member 31 is inserted into the gap so as to contact the side surface of the power module 14. (3) The radiator 16 is disposed on the heat radiation surface 19 of the power module 14, and the screw 18 is screwed into the screw hole 32 of the mounting member 31.

In the electrical component mounting structure according to the third embodiment, the screw 18 is inserted into the screw insertion hole 17 provided in the radiator 16 without providing the printed wiring board 1 with a hole through which the screw 18 for fixing the radiator passes. The power module 14, the radiator 16, and the attachment member 31 are clamped by being screwed into the screw holes 32 provided in the attachment member 31 via the power module 14, and the power module 14 and the radiator 16 are thermally connected. Can contact. Therefore, the wiring space of the printed wiring board 1 is not limited. In addition, when the end of the mounting member 31 that does not include the positioning means 33 is inserted as the start end, the end can be smoothly inserted, and the positioning means 33 provided at the end can be inserted so as to contact the side surface of the power module 14. Thus, the direction and position of the mounting member 31 relative to the power module 14 can be determined. Further, since the mounting member 31 is assembled after the power module 14 is mounted on the printed wiring board 1, damage or deformation of the mounting member 31 due to heat can be avoided when the power module 14 is mounted.

The above-described mounting member 21 shown in FIG. 3 may be, for example, another type of mounting member 71 shown in FIG. The attachment member 71 is a plate-shaped body made of PP, and includes locking claws 70 and 72 and positioning means 73 at both ends thereof. One locking claw 72 is molded perpendicularly to the mounting member 71 so as to be inscribed in the side surface of the power module 14 that does not include the lead terminal. The other locking claw 70 protrudes horizontally with respect to the mounting member 71 and is connected to the mounting member 71 by an integral hinge structure 74. The integral hinge structure 74 is formed so that the thickness of this part is thinner than the surrounding part, and the locking claw 70 can be bent so as to be perpendicular to the mounting member 71. The positioning means 73 is fitted to the screw support means 15 of the power module 14. Further, the locking claw 70 may be provided with positioning means 75.

The assembly process of the electrical component mounting structure using the mounting member 71 includes (1) mounting the power module 14 on the printed wiring board 1. (2) At this time, a gap is provided between the printed wiring board 1 and the power module 14 so that the attachment member can be inserted. (3) The positioning means 73 of the attachment member 71 is inserted into the gap so as to fit into the screw support means 15 of the power module 14. (4) Bend until the locking claw 70 provided with the integral hinge structure 74 contacts the side surface of the power module 14. (5) The radiator 26 is installed on the heat radiating surface 19 of the power module 14 so that the latching claw 72 is engaged with the engaging portion 27 of the radiator 26 with the latching claw 70 bent. Done in order.

The engaging claws 70 and 72 are engaged with the engaging portion 27 of the radiator 26 via the power module 14, and the power module 14, the radiator 26 and the mounting member 71 are sandwiched, whereby the power module 14 and the radiator are sandwiched. 26 will be in thermal contact. Therefore, it is not necessary to provide a hole for fixing the radiator 26 in the printed wiring board 1 and the wiring space of the printed wiring board 1 is not limited. Further, the positioning means 73 facilitates the work of assembling the mounting member 71 and the power module 14 and engaging the radiator, leading to production efficiency. Further, since the integral hinge structure 74 is provided, the mounting member 71 is assembled after the power module 14 is mounted on the printed wiring board 1, so that when the power module 14 is mounted, the mounting member 71 is damaged or deformed by heat. It can be avoided.

FIG. 9 shows an electrical component mounting structure according to a fourth embodiment of the electrical component mounting structure according to the present invention, which includes a power module having another structure.

Reference numeral 64 denotes another DIP type power module. The power module 64 has a screw support hole 65 at substantially the center thereof, and is mounted on the printed wiring board 1 through-holes. The mounting member 61 includes positioning means 63 and tapped screw holes 62. The radiator 66 includes a screw insertion hole (not shown).

The attachment member 61 is disposed between the printed wiring board 1 and the power module 64. The radiator 66 is disposed on the heat radiation surface 69 of the power module 64. The screw 18 is inserted into a screw insertion hole provided in the radiator 66 and is screwed into a screw hole 62 provided in the attachment member 61 via the power module 64.

In the assembly process of the fourth embodiment, (1) the screw support means 65 of the power module 64 and the screw hole 62 provided in the attachment member 61 are aligned with each other, and the side surface of the power module 64 is They are combined so as to be inscribed in the positioning means 63 provided on the mounting member 61. The power module 64 and the mounting member 61 may be bonded in advance with an adhesive. (2) The power module 64 is mounted on the printed wiring board 1 in a state where the power module 64 is combined with the mounting member 61. When the attachment member 61 is made of metal, the mounting is performed so that the attachment member 61 does not come into contact with the printed wiring board 1. (3) The radiator 66 is disposed on the heat radiation surface 69 of the power module 64. (4) The screw 18 is inserted into a screw insertion hole provided in the radiator 66 and is engaged with the screw hole 62 in this order. After the power module 64 is mounted on the printed wiring board 1, the attachment member 61 may be inserted and disposed between the power module 64 and the printed wiring board 1.

In the electrical component mounting structure according to the fourth embodiment, the screw 18 is inserted into a screw insertion hole (not shown) provided in the radiator 66 without providing a hole through which the radiator fixing screw 18 passes in the printed wiring board 1. The power module 64, the radiator 66, and the attachment member 61 are sandwiched by being screwed into the screw holes 62 provided in the attachment member 61 via the power module 64, and the power module 64 and the radiator 16 are heated. Can be touched. Therefore, the wiring space of the printed wiring board 1 is not limited. Further, since the position of the mounting member 61 can be determined so as to contact the positioning means 63 provided on the mounting member 61, the mounting member 61 and the power module 64 can be easily assembled, Positioning with the screw support means 65 and screwing into the screw hole 62 can be easily performed.

It should be noted that the present invention can be implemented in a mode in which various improvements, modifications, or variations are added based on the knowledge of those skilled in the art without departing from the spirit of the present invention. Moreover, you may implement with the form which substituted any invention specific matter to the other technique within the range which the same effect | action or effect produces.

DESCRIPTION OF SYMBOLS 1, 101, 107 ... Printed wiring board 11, 21, 31, 41, 51, 61, 71 ... Mounting member, 12, 32, 62 ... Screw hole, 13, 23, 33, 43, 53, 63, 73 ... Positioning means 14, 64, 102, 106 ... power module, 15, 65 ... screw support means, 16, 26, 66, 105, 108 ... radiator, 17 ... screw insertion hole, 18 ... screw, 19, 69 ... heat dissipation Surface, 22, 42, 52, 70, 72 ... locking claw, 27 ... engaging portion, 74 ... integral hinge structure, 103 ... heat dissipation base plate, 104 ... bolt, 109 ... lead pin, 110 ... support

Claims (4)

A power module mounted on a printed wiring board;
In order to dissipate the heat of the power module, a radiator disposed on the heat dissipation surface of the power module;
A positioning member for the power module, and a mounting member for attaching the radiator to the power module;
Clamping means for clamping the power module between the mounting member and the radiator,
The electrical component mounting structure, wherein the mounting member is interposed between the printed wiring board and the power module. The holding means is
Screw,
A screw hole provided in the mounting member;
It consists of a screw insertion hole provided in the radiator,
The electrical component mounting structure according to claim 1, wherein the screw is inserted through the screw insertion hole and is screwed into the screw hole via the power module. The clamping means is
A locking claw protruding from the mounting member;
An engaging portion formed on the radiator;
Consists of
The electrical component mounting structure according to claim 1, wherein the locking claw is engaged with the engaging portion via the power module. The positioning means comprises:
The mounting member comprises at least one protrusion formed along the side surface of the power module,
The electrical component mounting structure according to claim 1, wherein the power module is positioned in contact with the protrusion.

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