JP2005348506A - Outer cover of vehicle-mounted power converter and vehicle-mounted power converter using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an outer cover of a vehicle-mounted power converter which is prevented from resonating with the vibration of a low frequency generated during the travelling or acceleration of an automobile. <P>SOLUTION: The vehicle-mounted power converter 100 is equipped with a power converter body 101 having various electronic components mounted to a substrate, and with an outer cover 102 covering the mounted components on the power converter device body 101. The outer cover 102 includes a top plate 103 covering the upper surface of the power converter body 101, and four side plates 104 covering the side surfaces of the power converter body. A protruding part 105 projecting externally from the flat surface is formed on the top plate 103 of the outer cover. In this embodiment, the protruding part 105 is formed at the center of the width direction of the top plate 103 as one straight shape pattern. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an exterior cover for an in-vehicle power conversion device and an in-vehicle power conversion device using the same, and more particularly, to an exterior cover for an in-vehicle power conversion device that does not resonate with low-frequency vibrations. The present invention relates to an in-vehicle power converter used.

  In recent years, the demand for in-vehicle power converters has increased along with the complex diversification of automobile electrical systems such as hybrid systems. In general, a power conversion device such as a DC-DC converter or an AC-DC converter is covered with an exterior cover to protect electronic components in the device (see, for example, Patent Documents 1 and 2). In particular, in-vehicle power conversion devices are exposed to harsh usage environments such as running outdoors, and therefore must be adequately protected.

  FIG. 4 is an exploded perspective view showing a configuration of a conventional in-vehicle power converter.

As shown in FIG. 4, the power conversion device 400 includes a power conversion device main body 401 in which various electronic components are mounted on a substrate, and an exterior cover 402 that covers the mounting components on the power conversion device main body 401. Yes. The exterior cover 402 has a top plate portion 403 that covers the upper surface, and four side plate portions 404 that cover the side surfaces of the power conversion device main body. These are integrally formed by processing a single metal plate, and each surface of the top plate portion 403 and the side plate portion 404 is a flat surface.
JP 2001-86768 A JP 2003-199362 A

  Normally, high frequency vibrations such as several kHz or more do not occur much when a car is running, but low frequency vibrations of several tens to several hundreds of Hz are always generated mainly from engines and tires. However, in the above-described conventional power conversion device, the exterior cover 402 is resistant to low-frequency vibrations of several tens to several hundreds of Hz that occur during normal driving and acceleration of the automobile due to insufficient strength of the top plate 403. There was a problem that the sound resonated and abnormal sound was generated. The occurrence of such abnormal noise is anxiety when riding a car user. Further, the resonance of the exterior cover 402 may cause physical interference to the mounting component due to displacement of the top plate portion 403, dropping of the mounting component, loosening of screws, and the like. Such a problem reduces not only the power conversion device 400 but also the reliability of the automobile itself.

  Accordingly, an object of the present invention is to provide an exterior cover for an in-vehicle power conversion device that does not resonate with low-frequency vibrations generated during traveling or acceleration of an automobile. Another object of the present invention is to provide a highly reliable on-vehicle power converter.

  The object of the present invention is to have a plurality of cover surfaces including a top plate portion and a plurality of side plate portions, and at least one of the cover surfaces is provided with a convex portion of a predetermined pattern. This is achieved by the exterior cover of the power converter.

  In a preferred embodiment of the present invention, the pattern of the convex portions is a single linear pattern, a plurality of parallel linear patterns, or a cross pattern. If the pattern of the convex portion is any one of these, the processing becomes easy, and particularly in the case of a single linear pattern, the processing becomes extremely easy.

  According to another aspect of the present invention, there is provided a vehicle-mounted power conversion device comprising: a vehicle-mounted power conversion device main body; and an exterior cover of the vehicle-mounted power conversion device that covers the vehicle-mounted power conversion device main body. Is also achieved.

  According to the present invention, a convex portion having a predetermined pattern is provided on at least one surface of the exterior cover to improve the rigidity of the exterior cover, and the natural frequency of the exterior cover is shifted to a higher frequency. It is possible to provide an exterior cover for an in-vehicle power converter that does not resonate with low-frequency vibrations. Moreover, the highly reliable vehicle-mounted power converter device protected by such an exterior cover can be provided.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is an exploded schematic perspective view showing a configuration of an in-vehicle power converter according to a preferred embodiment of the present invention.

  As shown in FIG. 1, this in-vehicle power conversion device 100 includes a power conversion device main body 101 in which various electronic components are mounted on a substrate, and an exterior cover 102 that covers the mounting components on the power conversion device main body 101. I have.

  The exterior cover 102 is a stainless steel housing that can accommodate the power conversion device main body 101, physically protects the power conversion device main body 101, and also serves as an electromagnetic shield. The exterior cover 102 includes a top plate portion 103 that covers the upper surface of the power conversion device main body 101 and four side plate portions 104 that cover the side surfaces of the power conversion device main body. These are integrally formed by processing a single metal plate. The exterior cover 102 is fixed to the power conversion device main body 101 by fixing means (not shown).

  On the top plate portion 103 of the exterior cover, a convex portion 105 that protrudes outward from the flat surface is formed. In the present embodiment, the convex portion 105 is provided as a single linear pattern at the center in the width direction of the top plate portion 103. The convex portion 105 is formed by drawing, for example. By forming such a convex portion on the top plate portion 103, the rigidity of the exterior cover 102 can be increased.

  The length and width of the convex portion 105 formed on the top plate portion 103 are set according to a desired frequency range in which resonance of the exterior cover 102 should be prevented. If the convex part 105 is formed in the top-plate part 103 and the rigidity is improved, the natural frequency of the exterior cover 102 will shift to a higher frequency. Therefore, by setting the length and width of the convex portion 105 so as to have rigidity that does not resonate within a desired low frequency range, resonance of the exterior cover 102 within the frequency range can be prevented.

  As described above, according to the present embodiment, the top plate portion 103 of the exterior cover 102 is not simply a flat surface, but is provided with one linear convex portion 105, so that low-frequency vibrations are provided. It is possible to suppress the resonance of the exterior cover 102 that is particularly problematic due to the above. Therefore, it is possible to suppress the low-frequency vibration of the exterior cover 102 that is easily audible as vibration noise, and to improve the reliability of the in-vehicle power conversion device.

  In the embodiment described above, the case where one linear convex portion is formed on the top plate portion of the exterior cover has been described, but various shapes of the convex portion are conceivable.

  FIG. 2 is a schematic perspective view showing the shape of an exterior cover according to another preferred embodiment of the present invention.

  As shown in FIG. 2, the exterior cover 202 is different from the exterior cover 102 shown in FIG. 1 in that three linear patterns of convex portions 205 are formed on the top plate portion 103. Is different. Other points are the same as those of the outer cover 102. According to this embodiment, the rigidity of the exterior cover 202 can be further improved, and resonance of the exterior cover 202 can be prevented within a wider range of low frequencies. Therefore, the reliability of the in-vehicle power conversion device can be improved.

  FIG. 3 is a schematic perspective view showing the shape of an exterior cover according to another preferred embodiment of the present invention.

  As shown in FIG. 3, the exterior cover 302 has two linear patterns orthogonal to each other, that is, the cross-shaped convex portions 305 are formed on the top plate portion 103 in FIG. It differs from the exterior cover 102 shown. Other points are the same as those of the outer cover 102. According to this embodiment, the rigidity of the exterior cover 302 can be further improved, and resonance of the exterior cover 302 can be prevented within a wider range of low frequencies. The reliability of the in-vehicle power converter can be improved.

  The present invention is not limited to the above embodiments, and various modifications can be made within the scope of the invention described in the claims, and these are also included in the scope of the present invention. Needless to say.

  For example, in the above-described embodiment, as a pattern of the convex portion formed on the top plate portion, one linear pattern, three linear patterns parallel to each other, a cross pattern, and the like have been described as examples. The present invention is not limited to this, and various patterns are conceivable. However, a linear pattern is more preferable in terms of ease of processing.

  Moreover, in the said embodiment, although the convex part formed in the top-plate part of an exterior cover demonstrated the case where it protruded outside rather than the flat surface of a top-plate part, a convex part is from the flat surface of a top-plate part. May also protrude inward.

  In the above embodiment, the case where the exterior cover has the top plate portion and the four side plate portions has been described. However, any number of side plate portions may be provided, and a low plate portion that covers the bottom surface of the power converter main body is provided. It does not matter even if it is done. That is, the exterior cover according to the present invention has a plurality of cover surfaces such as a top plate portion and a side plate portion, and at least one of them may be provided with a convex portion of a predetermined pattern.

  Moreover, in the said embodiment, although the pattern of a convex part is formed only in the top-plate part of an exterior cover, it is not limited to this, and when the area of a side-plate part is large, it is desired as needed A convex portion of the pattern may be formed. That is, the convex pattern may be formed on any one surface of the exterior cover, and is preferably provided on the main surface of the exterior cover having the largest area among the plurality of cover surfaces.

FIG. 1 is an exploded schematic perspective view showing a configuration of an in-vehicle power converter according to a preferred embodiment of the present invention. FIG. 2 is a schematic perspective view showing the shape of an exterior cover according to another preferred embodiment of the present invention. FIG. 3 is a schematic perspective view showing the shape of an exterior cover according to another preferred embodiment of the present invention. FIG. 4 is an exploded perspective view showing a configuration of a conventional in-vehicle power converter.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Power converter 101 Power converter main body 102 Exterior cover 103 Top plate part 104 Side plate part 105 Projection part 202 Exterior cover 205 Projection part 302 Exterior cover 305 Projection part 400 Power converter 401 Power conversion apparatus body 402 Exterior cover 403 Top panel part 404 Side plate

Claims (5)

  An exterior cover for an in-vehicle power conversion device, comprising: a plurality of cover surfaces including a top plate portion and a plurality of side plate portions, wherein at least one of the cover surfaces is provided with a convex portion having a predetermined pattern.   The exterior cover of the in-vehicle power conversion device according to claim 1, wherein the pattern of the convex portion is a linear pattern.   The exterior cover of the in-vehicle power conversion device according to claim 2, wherein the pattern of the convex portion is a plurality of parallel linear patterns.   The exterior cover of the in-vehicle power conversion device according to claim 1, wherein the pattern of the convex portion is a cross pattern.   An in-vehicle power converter comprising: a power converter main body; and an exterior cover of the in-vehicle power converter according to any one of claims 1 to 4 covering the power converter main body.

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