JP2007037384A - Power supply, casing, and lid body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power supply capable of reducing manufacturing cost without causing an increase in electromagnetic noise in a radio band, to provide a casing for covering the power supply, and to provide a lid body that constitutes the casing. <P>SOLUTION: The power supply 1 comprises a conductive pedestal 20, the lid body 10, and a power circuit 30 arranged in a space formed by the pedestal 20 and the lid body 10. The pedestal 20 has a bottom 21 and a wall 22 erected along the periphery of the bottom 21. The lid body 10 has an upper plate 11, and a side plate 12 that is formed along the periphery of the upper plate 11 and faces the wall 22 of the pedestal 20. A plurality of raised sections 14 which come into contact with the wall 22 of the pedestal 20 are formed at the side plate 12 of the lid body 10. As a result, the lid boy 10 is fixed to the pedestal 20 without installing a flange on the edge of an opening 11. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a power supply device configured by covering a power supply circuit with a casing, a casing covering the power supply circuit, and a lid constituting the casing, and the power supply device suitably mounted on an automobile, the casing and the lid About the body.

  In general, an automobile has a battery that outputs a low-voltage DC voltage of about 12 volts, for example, as a power source for driving vehicle-mounted devices such as wipers, headlights, room lights, audio equipment, air conditioners, and various instruments. It is installed. Usually, such an in-vehicle battery is charged by rectifying an AC output voltage from an AC generator driven by the rotation of the engine to obtain a high-voltage DC voltage, and this DC input voltage is converted into a switching power supply device. Is converted into a lower-voltage DC voltage using the, and then supplied to the low-voltage battery.

  This switching power supply device performs voltage conversion by, for example, converting a DC input voltage into an AC voltage once by an inverter circuit and then transforming the AC voltage by a voltage conversion transformer and converting it again to a DC voltage by a rectifier circuit or the like. Is. This switching power supply device incorporates magnetic circuit components such as a transformer and a choke coil, but is housed in a limited space in the vehicle, and thus is miniaturized by arranging magnetic circuit components close to each other. However, when magnetic circuit components are arranged close to each other in this manner, these components are magnetically coupled to each other, and electromagnetic noise in the radio band is generated from these components. Therefore, the switching power supply device is generally covered with a conductive casing so that electromagnetic noise in the radio band does not affect other devices.

  For example, as described in Patent Document 1, this conductive casing is made of a metal container body (pedestal) on which a switching power supply device is placed, and the pedestal to combine the switching power supply device with an electromagnetic wave. And a cover for shielding. Each of these pedestals and covers has flanges (protrusions projecting all around the part for reinforcement or connection), and the respective switching power supply devices are electromagnetically shielded by fixing the respective flanges with bolts. It is like that. Here, the cover is formed by sheet metal processing.

JP 2005-110328 A

  This cover has a larger development area than that without a flange. As a result, the number of covers that can be cut out from a single plate is reduced. Further, a bending process for the flange is required in the sheet metal processing. Thus, the technique described in Patent Document 1 has a problem that the manufacturing unit price increases.

  The present invention has been made in view of such a problem, and an object thereof is to provide a power supply device capable of reducing the manufacturing unit price without increasing electromagnetic noise in a radio band, a casing covering a power supply circuit, and An object of the present invention is to provide a lid constituting the housing.

  The power supply device of the present invention includes a conductive pedestal and a lid, and a power supply circuit unit disposed in a space formed by the pedestal and the lid. The pedestal has a bottom portion and a wall portion erected along the periphery of the bottom portion, and the lid body is formed along the periphery of the upper plate portion and the upper plate portion and faces the wall portion of the pedestal. A side plate portion to be used. A plurality of raised portions that come into contact with the wall portion of the pedestal are formed on the side plate portion of the lid.

  The housing of the present invention is for housing the power supply circuit unit, and includes a conductive base and a lid. The pedestal has a bottom portion and a wall portion erected along the periphery of the bottom portion, and the lid body is formed along the periphery of the upper plate portion and the upper plate portion and faces the wall portion of the pedestal. A side plate portion to be used. A plurality of raised portions that come into contact with the wall portion of the pedestal are formed on the side plate portion of the lid.

  The lid of the present invention forms a space for accommodating the power supply circuit portion by being combined with a conductive base having a bottom portion and a wall portion erected along the periphery of the bottom portion. The lid includes a conductive upper plate portion and a conductive side plate portion that is formed along the periphery of the upper plate portion and faces the wall portion of the base. A plurality of raised portions that come into contact with the wall portion of the pedestal are formed on the side plate portion of the lid.

  It is preferable that the above-described raised portion is formed on the inner surface of the side plate portion and is in contact with the outer surface of the wall portion. The raised portion may be in point contact with the wall portion or in line contact with the wall height direction. The intervals at which the raised portions come into contact with the wall portions may be equal intervals, or may not be equal intervals. The arrangement of the raised portions may be linear or zigzag (zigzag). The lid is formed by, for example, sheet metal processing.

  In the power supply device, the housing, and the lid of the present invention, the plurality of raised portions are formed on the side plate of the lid and are formed so as to contact the wall of the pedestal. Even if a flange is not provided, the lid is fixed to the pedestal. When a plurality of raised portions are provided on the side plate portion of the lid body as described above, a gap is generated between a portion of the side plate portion of the lid body having no raised portion and the wall portion. However, since the lid and the pedestal are electrically connected via the raised portions, the gap is electromagnetically shielded by appropriately adjusting the size and shape of the raised portions, the interval and the arrangement of the raised portions. Is done.

  According to the power supply device, the casing, and the lid of the present invention, the plurality of raised portions that contact the wall portion of the pedestal are formed on the side plate of the lid, so that the lid can be provided without providing a flange on the side plate. Can be fixed to the pedestal. As a result, there is no need to provide a flange on the side plate portion. For example, when the lid is formed by sheet metal processing, it is possible to cut out more lids from a single plate and, further, bending for the flange. Since the process can be eliminated, the manufacturing unit cost can be reduced.

  In addition, since the lid and the pedestal are electrically connected via the raised portions, the gap between the lid and the pedestal can be adjusted by appropriately adjusting the size and shape of the raised portions and the spacing and arrangement between the raised portions. Even if it is not filled with conductive tape or the like, the gap can be shielded electromagnetically. As a result, electromagnetic noise generated in the power supply circuit section can be prevented from leaking from the gap, and in particular, the level of radio noise leaking from the gap is filled with conductive tape or the like. It can be reduced to the same level as that leaking from the housing.

  From this, according to the power supply device, housing | casing, and cover body of this invention, a manufacturing unit price can be reduced, without increasing the electromagnetic noise of a radio | wireless band.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a perspective view of a power supply device 1 according to an embodiment of the present invention. 2 is a cross-sectional configuration in the direction of arrows AA in FIG. 1, FIG. 3 is a plan configuration of the cover 10 in FIG. 1 (development plate 10A), and FIGS. 4, 5, and 6 are diagrams. 7 shows a specific example of the cross-sectional configuration in the direction of arrow BB in FIG. 2, and FIG. 7 shows the cross-sectional configuration in the direction of arrow CC in FIG.

  In the power supply device 1, the power supply circuit unit 30 is covered with a housing 2 including a lid 10 and a pedestal 20. The housing 2 is made of a conductive material such as iron or aluminum alloy. Therefore, the housing 2 not only functions as a protective container that protects the power supply circuit unit 30 from external impacts and dust, but also functions as a heat sink that dissipates heat generated from the power supply circuit unit 30, and the power supply circuit unit Among the electromagnetic noises generated from 30, it functions as an electromagnetic shield that shields noise in the radio band in particular.

  The case 2 is provided with an electromagnetic shielding function in this way because electromagnetic noise in the radio band generated from the power supply circuit section 30 leaks to the outside, for example, an AM / FM radio (see FIG. This is for preventing hearing noise from being mixed with the voice of the voice (not shown). Here, “audible noise” refers to a sound that can be heard when a person listens to the AM / FM radio sound with his / her ear.

  The power supply circuit unit 30 is a DC-DC converter that converts a high-voltage DC input voltage supplied from a high-voltage battery (not shown) into a lower DC output voltage and supplies it to a low-voltage battery (not shown). It functions. The power supply circuit unit 30 includes a magnetic circuit component 31 such as a transformer and a choke coil arranged directly on the base 20, and a circuit board 32 on which an inverter circuit, a rectifying and smoothing circuit, and the like are mounted on the board.

  The housing 2 is configured by combining the lid 10 and the pedestal 20. The lid 10 is molded by sheet metal processing. Specifically, as shown in FIG. 3, the development plate 10 </ b> A is cut out from a single plate, and the development plate 10 </ b> A is bent. The lid 10 has a rectangular upper plate 11, a side plate 12, and a plurality of fixing portions 13 (13A, 13B, 13C, 13D).

  The side plate portion 12 is formed along the periphery of the upper plate plate 11 and has a plurality of raised portions 14 on the inner surface of the side plate portion 12. The raised portion 14 has a hemispherical shape, and comes into point contact with a side surface of a wall portion 22 (described later) of the pedestal 20 when the lid 10 is combined with the pedestal 20. As a result, the lid body 10 is electrically connected to the pedestal 20 via the raised portion 14. The arrangement of the raised portions 14 may be linear as shown in FIG. 4, or may be staggered (zigzag) as shown in FIG. The intervals d between the raised portions 14 may be equal intervals as shown in FIG. 4 or may not be equal intervals as shown in FIG. Further, the raised portion 14 has a height h that can press the side surface of the wall portion 22 when it makes point contact with the side surface of the wall portion 22. Thereby, the lid 10 is fixed to the base 20 without providing a flange at the edge of the opening 11.

  In addition, it is preferable to adjust the magnitude | size of a pressing pressure according to the magnitude | size of the physical vibration from the outside. If the pressure is too small, the raised portion 14 temporarily floats from the side surface of the wall portion 22 due to external physical vibration, and a sound is generated when the raised portion 14 comes into contact with the side surface of the wall portion 22 again. This is because so-called “chatter” occurs.

  The fixing portions 13 (13 </ b> A, 13 </ b> B, 13 </ b> C, 13 </ b> D) are for fixing the lid body 10 and the pedestal 20 to each other with bolts or the like, and are formed at the four corners of the lid body 10. The fixing portion 13A and the fixing portion 13C, and the fixing portion 13B and the fixing portion 13D are arranged so as to be alternated when being cut out from one plate. In addition, the protrusion which protruded to the perimeter of the cover body 10 like a flange is not formed in the cover body 10. FIG.

  The pedestal 20 is molded by die casting. Here, “die casting” refers to a method of producing a large amount of castings with high precision and excellent casting surface in a short time by injecting molten metal into a precise mold. The pedestal 20 has a bottom portion 21, a wall portion 22, and a plurality of fixing portions 23 (23A, 23B, 23C, 23D).

  The bottom portion 21 is used to place the power supply circuit portion 30 and to efficiently dissipate heat. The bottom portion 21 is provided with a recess 24 for arranging the magnetic circuit component 31 and a support portion 25 for supporting the circuit board 32. And fins 26 for efficiently dissipating heat.

  The wall portion 22 is erected along the periphery of the bottom portion 21 and has a stripe-like convex shape having a side surface perpendicular to the surface of the pedestal 20. The wall portion 22 has a height that can contact the raised portion 14 of the lid portion 10.

  The fixing portions 23 (23A, 23B, 23C, 23D) are for fixing the lid body 10 and the pedestal 20 to each other with bolts or the like, and are formed at portions corresponding to the fixing portions 13, respectively. In addition, the protrusion which protruded to the perimeter of the base 20 like a flange is not formed in the base 20.

  At this time, a gap 40 as shown in FIG. 7 is formed between the portion of the inner surface of the side plate portion 12 where the raised portion 14 is not formed and the outer surface of the wall portion 22, and the inside of the housing 2 is The housing 2 communicates spatially with the outside. The gap 40 is formed when the raised portion 14 is in point contact with the side surface of the wall portion 22, and has a structure that is so intricate that the power supply circuit portion 30 inside the housing 2 cannot be directly seen from the outside. It has become. Thus, although the clearance gap 40 is formed in the housing | casing 2, since the cover body 10 and the base 20 are electrically connected through the protruding part 14, the height h of the protruding part 14 and the protruding part The gap 40 is electromagnetically shielded by appropriately adjusting the distance d and the arrangement between the portions 14.

  Next, a method for manufacturing the power supply device 1 having the above configuration will be described.

  First, a single iron plate as shown in FIG. 3 is prepared, a hole is made in a portion corresponding to the fixing portion 13 (13A, 13B, 13C, 13D), and a plurality of raised portions are formed in a portion corresponding to the side plate portion 12. 14 is formed. At this time, a drawing process (not shown) such as unevenness is applied to portions corresponding to the upper plate portion 11 and the side plate portion 12 as necessary. Thereafter, the development plate 10A is cut out, and a mold is pressed against the cut out development plate 10A to bend a necessary portion. Note that the mold is provided with “bald” for avoiding contact with the raised portion 14. Thereafter, the margin is welded and the mold is pulled out. In this way, the lid body 10 is formed. Next, after the molten iron is injected into the mold, the injected iron is cooled. Thereafter, the mold is broken and the molded iron is pulled out of the mold. In this way, the base 20 is formed.

  At this time, the lid body 10 is only formed with fixing portions 13 for fixing the lid body 10 and the pedestal 20 to each other with bolts or the like at the four corners of the lid body 10, respectively. The protrusion which protruded to the perimeter of the cover body 10 like this is not formed. As a result, the fixing portion 13A and the fixing portion 13C, and the fixing portion 13B and the fixing portion 13D can be provided alternately on one aluminum alloy plate, as shown in FIG. In addition, it is possible to arrange the deployment plates 10A densely. As a result, the number of sheets that can be cut out of the development plate 10A from one plate of aluminum alloy increases, so that the manufacturing unit price of the lid 10 can be reduced.

  In addition, since the “nage” of the mold is formed according to the size of the raised portion 14 in the lateral direction (direction perpendicular to the wall height direction), the smaller the raised portion 14 is in the lateral direction, The area where the mold can be applied to the developing plate 10A becomes wider, and the number of unbent parts is reduced. The raised portion 14 according to the present embodiment has a hemispherical shape, and its lateral size is relatively small, so that it is possible to reduce unsweetened portions.

  Next, the operation of the power supply device 1 configured as described above will be described.

  It is assumed that the power supply circuit unit 30 is connected to the output side of the high voltage battery and the input side of the low voltage battery. The power supply circuit unit 30 once converts a high-voltage DC input voltage input from the high-voltage battery into an AC voltage by an inverter circuit, and then transforms the AC voltage with a voltage conversion transformer and also converts a low-voltage DC voltage with a rectifier circuit or the like. The output voltage is converted, and the low-voltage DC output voltage is supplied to the low-voltage battery.

  At this time, the power supply circuit unit 30 generates a large amount of heat due to power loss, but since it is in contact with the pedestal 20 of the housing 2, heat is mainly dissipated from the ribs 21 of the pedestal 20. In addition, since the gap 40 communicating with the outside is provided between the lid 10 and the base 20, the heat trapped inside the housing 2 is dissipated to the outside through the gap 40.

  Further, since the power supply circuit unit 30 incorporates a magnetic circuit component 31 such as a transformer or a choke coil, the magnetic circuit component 31 generates electromagnetic noise. The power supply circuit unit 30 is covered with the housing 2 but is not sealed because there is a gap 40 between the lid 10 and the base 20. However, the gap 40 has a structure in which the power supply circuit unit 30 inside the housing 2 cannot be directly seen from the outside. The lid 10 and the pedestal 20 are electrically connected via the raised portion 14. Therefore, by appropriately adjusting the height h of the raised portions 14 and the interval d and arrangement between the raised portions 14, the gaps 40 can be formed without filling the gap 40 between the lid 10 and the pedestal 20 with a conductive tape or the like. 40 can be shielded electromagnetically.

  As a result, the electromagnetic noise generated in the magnetic circuit component 31 can be prevented from leaking from the gap 40, and in particular, the level of radio noise in the radio band leaking from the gap 40 can be reduced to the conductive tape. It can be reduced to the same level as that leaked from a case buried in the housing.

  From this, according to the power supply device 1 of this Embodiment, a manufacturing unit price can be reduced, without increasing the electromagnetic noise of a radio | wireless band.

  Although the present invention has been described with reference to the embodiment, the present invention is not limited to this embodiment, and various modifications can be made.

  For example, in the above-described embodiment, the fixing portions 13 and 23 are provided. However, when the size at which the raised portion 14 presses the side surface of the wall portion 22 is appropriately adjusted, the fixing portions 13 and 23 are provided. It does not have to be. Specifically, even if the lid 10 and the pedestal 20 are not fixed by the fixing portions 13 and 23, “chatter” occurs, or the contact point between the raised portion 14 and the wall portion 22 is physically applied from the outside. It is preferable that pressure is applied to such an extent that it does not move due to mechanical vibration. In this case, since the development plates 10A can be arranged more densely, the number of development plates 10A that can be cut out from one aluminum alloy plate further increases, and as a result, the lid 10 is manufactured. The unit price can be further reduced.

  In the above-described embodiment, the hemispherical raised portion 14 is provided. However, as shown in FIGS. 8 and 9, a raised portion 14 having a notch shape may be used. FIG. 9 shows a cross-sectional configuration in the direction of arrows CC in FIG. The notch-like shape can reduce the size in the lateral direction and the number of unbent portions as in the hemispherical shape. Further, the notch-shaped shape can be formed by simply pressing the edge of the development plate 10A. When the raised portion 14 is formed by pressing the edge of the development plate 10A, the notch of the wall portion 22 is formed. Even if the height is low, the raised portion 14 can be brought into contact with the side surface of the wall portion 22.

  Moreover, in the said embodiment, although the protruding part 14 formed so that it might point-contact with the side surface of the wall part 22 was provided, as shown in FIG.10 and FIG.11, the side surface and vertical direction of the wall part 22 are provided. It is good also as the protruding part 15 formed so that a line contact might be carried out. FIG. 11 shows a cross-sectional configuration in the direction of arrows DD in FIG. Also in this case, as in the case of the hemispherical shape, the size in the lateral direction can be reduced, and the portion with poor bending can be reduced. Further, in this way, by forming the raised portion 15 so as to be in line contact with the side surface of the wall portion 22 in the vertical direction, the strength of the housing 2 can be increased, and the occurrence of “chatter” is almost eliminated. be able to.

  In addition, since the side plate part 12 is formed by sheet metal processing, the side plate part 12 has “warping”, “waves”, and the like. Therefore, when the lid 10 is combined with the pedestal 20, the gap 30 becomes non-uniform due to “warping” or “waving” of the side plate portion 12, and as a result, all the raised portions 14 are placed on the side surfaces of the wall portion 22. There may be a case where the contact cannot be made. However, the “warping” and “wave inside” of the side plate portion 12 are grasped in advance, and the size and shape of the raised portions 14 and the spacing and arrangement between the raised portions 14 according to the “warpage” and “wave inside” are determined. By appropriately adjusting, the non-uniform gap 30 can be electromagnetically shielded. For example, when the side plate portion 12 bulges outward and the gap 30 in the central portion in the lateral direction (longitudinal direction) of the side plate portion 12 becomes larger than a predetermined width, a bulge with a height h increased only at that portion. What is necessary is just to provide the part 14. FIG.

  In addition to the method of adjusting the shape or the like of the raised portion 14 as described above, for example, there is a method of providing a bulge having a curved surface in the height direction on the side plate portion 12. According to this method, since there is almost no “warping” or “wave-out” in the side plate portion 12, the end portion of the side plate portion 12 and the pedestal 20 can be reliably brought into contact with each other.

It is a perspective view of the housing | casing which concerns on one embodiment of this invention. It is a cross-sectional block diagram of the AA arrow direction of the housing | casing of FIG. It is a perspective view of an expansion | deployment board. It is a cross-sectional block diagram of the BB arrow direction of the housing | casing of FIG. It is a cross-sectional block diagram for demonstrating the modification of a protruding part. It is a cross-sectional block diagram for demonstrating the other modification of a protruding part. It is a cross-sectional block diagram of the CC arrow direction of the housing | casing of FIG. It is a cross-sectional block diagram for demonstrating the other modification of a protruding part. It is a cross-sectional block diagram of the DD arrow direction of the housing | casing of FIG. It is a cross-sectional block diagram for demonstrating the other modification of a protruding part. It is a cross-sectional block diagram of the EE arrow direction of the housing | casing of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Power supply device, 2 ... Housing | casing, 10 ... Cover body, 10A ... Expanding board, 11 ... Upper board board, 12 ... Side board part, 13, 13A, 13B, 13C, 13D, 23, 23A, 23B, 23C, 23D DESCRIPTION OF SYMBOLS Fixed part, 14, 15, 16 ... Raised part, 20 ... Base, 21 ... Bottom part, 22 ... Wall part, 24 ... Recessed part, 25 ... Support part, 26 ... Fin, 30 ... Power supply circuit part, 31 ... Magnetic circuit component , 32 ... circuit board, 40 ... gap, d ... spacing between raised parts, h ... height of raised parts.

Claims (4)

A conductive pedestal having a bottom portion and a wall portion erected along the periphery of the bottom portion;
In a space formed by a conductive lid having an upper plate portion and a side plate portion formed along the periphery of the upper plate portion and facing the wall portion of the pedestal, and the pedestal and the lid. And a power supply circuit section arranged,
The side plate portion of the lid includes a plurality of raised portions that come into contact with the wall portion of the base. The power supply device according to claim 1, wherein the raised portion is formed on an inner surface of the side plate portion and is in contact with an outer surface of the wall portion. A housing for housing a power circuit section,
A conductive pedestal having a bottom portion and a wall portion erected along the periphery of the bottom portion;
An electrically conductive lid having an upper plate portion and a side plate portion formed along the periphery of the upper plate portion and facing the wall portion of the pedestal;
The side plate portion of the lid includes a plurality of raised portions that come into contact with the wall portion of the pedestal. A conductive lid that forms a space for accommodating a power supply circuit portion by being combined with a conductive pedestal having a bottom portion and a wall portion erected along the periphery of the bottom portion,
An upper plate portion and a side plate portion formed along the periphery of the upper plate portion and facing the wall portion of the pedestal;
The said side plate part of the said cover body has a some protruding part which contacts the said wall part of the said base. The cover body characterized by the above-mentioned.

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