JPH0334915Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a holder used for attaching high-power electronic components such as power transistors to a heat sink. The present invention relates to a holder that can press and fix the above power element to a heat sink.

[Conventional technology]

High-power electronic components (hereinafter referred to as "power devices") such as power transistors, thyristors, and various IC-based constant voltage regulators are used in power supply circuits and power control circuits, but these power devices generate a large amount of heat internally. Therefore, it is usually used attached to a heat sink. Recently, most power devices with relatively small power capacities have adopted a resin molded package structure in order to reduce package costs.

When attaching such a resin-molded power element to a heatsink, use the mounting holes formed on the top of the power element to screw it directly to the heatsink, or use a holder for the power element. Press and fix to the heat sink.

The conventional power device holder is
It has a structure in which multiple protrusions of the same shape that press the power element are arranged in parallel on a plate-shaped body, and insertion holes for mounting screws are bored between them. By tightening in this direction, each protrusion located between them presses and fixes the power element to the heat sink.

[Problem that the invention attempts to solve]

According to the prior art, for example, when three power elements are attached to a heat sink, at least two attachment screws are required. As the number of power elements to be installed increases, more mounting screws are required, and there are also more locations to tighten the screws, which has the disadvantage of increasing the number of parts, requiring more assembly man-hours, and lengthening the work time. Ta. Particularly in the case of mass production, an increase in the number of mounting screws and an increase in the work of tightening the screws have caused an increase in costs and a significant decrease in work efficiency.

The purpose of the present invention is to eliminate such drawbacks of the conventional technology, and to enable attachment of three or more power elements to a heat sink using one attachment member, thereby reducing the number of parts. It is an object of the present invention to provide an improved holder for attaching a power element, which can realize a significant reduction in assembly man-hours and assembly time, and thereby achieve a significant reduction in cost.

[Means for solving problems]

The present invention, which can achieve the above objects, is made of a plate-like body with spring properties, and has one insertion hole for a mounting member formed in the middle part, and a power element is pressed on both sides of the plate-like body. 3 protrusions
This is a holder for a power device, in which more than one protrusion is provided, and the height of each protrusion becomes lower toward the insertion hole.

Here, for example, a screw is suitable as the attachment member, and in that case, it is desirable to form a female threaded portion in the insertion hole. The number of power elements that can be attached to one holder is not particularly limited to three or more, but in practice it is about three to four in order to firmly fix all the power elements.

The material of the holder is not particularly limited as long as it has good spring properties, but for example, phosphor bronze plate, stainless steel plate, etc. are used.

[Effect]

A power element is installed between the radiator and the book holder, and each protrusion just hits the power element. In this state, if the holder is attached to the heat sink using screws or the like using the attachment member insertion holes, three or more power elements can be fixed at once. For example, when the mounting screw is tightened, the tall protrusion located on the outside first comes into contact with the power element and presses it against the heat sink. As the holder is further tightened, the holder has a spring property, so it bends and deforms, and the inner protrusion comes into contact with the power element and presses it. In this way, by deforming the holder, each protrusion can press and fix the corresponding power element to the surface of the heat sink.

〔Example〕

Hereinafter, the present invention will be explained in more detail based on the drawings. FIG. 1 is an explanatory diagram showing an example of a usage state of a holder for a power device according to the present invention,
FIG. 2 is a plan view thereof. This embodiment is an example in which three resin-molded power elements 10 are attached to a heat sink 12. The heat sink 12 has a simple plate-like structure, and an insulating sheet 14 is adhered to the surface thereof. A mounting hole 16 is bored at a position slightly offset from the center. Two power elements are located on one side of the mounting hole 16, and one power element is located on the opposite side.

The holder 18 according to the present invention is configured to press-bond the three power elements 10 arranged in parallel to the heat sink 12 in this way. This holder 18 is made of a resilient material such as a stainless steel plate, and has an insertion hole 20 for a mounting screw formed at a position slightly offset from the center of the intermediate portion, and three holes for pressing the power element 10 on both sides thereof. protrusions 22a, 22
b, 22c are provided. These protrusions can be easily formed by punching or the like.

The points in which the present invention is significantly different from the prior art are as follows:
Only one mounting screw insertion hole 20 is formed for three or more power element pressing projections, and the height of each projection is not all the same and is close to the mounting screw insertion hole 20. The point is that the design is such that the one farther away is lower and the one further away is higher. However, the protrusions formed at symmetrical positions with respect to the mounting screw insertion hole 20 may have the same height. Therefore, the protrusions 22b and 22c have the same height.

Such a holder 18 has a mounting screw 24
Fixed by Insert the mounting screw 24 into the mounting hole 16 of the radiator 12 through the washer 26.
, and is screwed into the female threaded portion of the mounting screw insertion hole 20 formed in the holder 18. By tightening the mounting screw 24, the protrusion 22a located on the outside comes into contact with the power element 10 and presses the power element toward the radiator. When the mounting screw 24 is further tightened, the holder 18 is made of a material with spring properties, so it is elastically deformed in a curved manner, and the protrusions 22b and 22c located inside come into contact with the power elements, and their power is Crimp the element to the heat sink. By this 1
Three or more power elements can be fixed using the same mounting screws.

In the above embodiment, there are three power elements, but it is possible to install more than three power elements. When attaching a larger number of power elements at the same time, the protrusion may be made taller as it gets farther from the attachment member insertion hole. However, if too many power elements are attached at once, the assembly work may become more troublesome, so it is practically preferable to attach about 3 to 4 power elements.

The problem here is the degree of tightening of the mounting screws. If it is too loose, it will not be possible to press the power element located on the inside, and if it is too tight, the holder will bend too much and the protrusion located on the outside will not be able to apply sufficient pressing force to the power element. . To this end, it is important to tighten the mounting screws 24 by a predetermined length so that the pressing force applied to each power element is uniform. In practice, if a cylindrical spacer of a predetermined length is interposed between the holder 18 and the radiator 12 so that the screw passes through the spacer, the screw can always be tightened by the predetermined length, which improves work efficiency. It becomes extremely good.

Although screws are used as attachment members in the above embodiments, other screws may be used. For example, if you use a synthetic resin fastener that has bulging fitting parts on both ends that fit into the mounting holes,
There is no need to separately provide a spacer as described above.

[Effect of idea]

The present invention is a holder for attaching power elements configured as described above, and since it is possible to firmly press three or more power elements to a heat sink with one attachment member, screws etc. This has the excellent practical effect of reducing the number of mounting parts, reducing the number of man-hours and significantly shortening the work time, and thereby significantly reducing the cost of installing power devices. .

[Brief explanation of the drawing]

FIG. 1 is an explanatory view showing an embodiment of a structure for attaching a power element to a heat sink using a holder according to the present invention, and FIG. 2 is a plan view thereof. 10...power element, 12...heatsink, 18...
...Holder, 20...Insertion hole for mounting screw, 2
2a, 22b, 22c...Protrusions.

Claims (1)

[Scope of utility model registration request] It is made of a plate-like body with spring properties, and has an insertion hole for a mounting member formed in the middle part, and a total of three or more protrusions that press the power element on both sides, and the height of each protrusion is A holder for a power element that is lower toward the insertion hole.