• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    An electronic assembly (48, 76) having a cooling device (10) comprises a cooling plate (12) equipped on its upper face (14) with a plurality of cooling pillars (16); a first printed circuit board (50) having at least one heat generating zone (52) bearing against the lower face (22) of the cooling plate (12); each pillar (16) comprising a ventilation means (29) comprising a hub (30) equipped with blades (32), the blades (32) being arranged axially along each pillar (16) so as to be able to turn around the pillar (16) thereby creating a cooling air flow of the pillars (16).
    公开号:FR3063864A1
    申请号:FR1751937
    申请日:2017-03-09
    公开日:2018-09-14
    发明作者:Timo Feismann；Matthias Rieke
    申请人:Aptiv Technologies Ltd；Delphi International Operations Luxembourg SARL；
    IPC主号:
    专利说明:

    Holder (s): DELPHI INTERNATIONAL OPERATIONS LUXEMBOURG S.A R.L. Limited liability company.
    Extension request (s)
    Agent (s): DELPHI FRANCE SAS Simplified joint-stock company.
    (04) ELECTRONIC DEVICE FOR A MOTOR VEHICLE.
    FR 3 063 864 - A1 (57) An electronic assembly (48, 76) comprising a cooling device (10) comprises a cooling plate (12) equipped on its upper face (14) with a plurality of cooling pillars (16 ); a first printed circuit board (50) comprising at least one heat generating zone (52) bearing against the underside (22) of the cooling plate (12); each pillar (16) comprising a ventilation means (29) comprising a hub (30) equipped with blades (32), the blades (32) being arranged axially along each pillar (16) so as to be able to rotate around the pillar (16) thereby creating a flow of cooling air for the pillars (16).


    DP-323436
    ELECTRONIC DEVICE FOR A MOTOR VEHICLE
    TECHNICAL AREA
    The present invention relates to an electronic device for a motor vehicle and more particularly to a heat dissipation device for a printed circuit board.
    TECHNOLOGICAL BACKGROUND OF THE INVENTION
    Electronic control units on board motor vehicles increasingly include semiconductor components such as microcontrollers, signal processing components or even power switches. The amount of heat generated by semiconductor devices is constantly increasing. It is generally known to provide heat sinks with cooling pillars which are used to transfer heat from an electronic component to the surrounding air. According to the technical literature, the cooling pillars of heat sinks are also called "needles" or "pin fins". More commonly, the Anglo-Saxon term used to designate a heat sink with cooling pillars is pin fin heat sink ’. Heat sinks with cooling pillars are also applicable to multi-component devices such as power supplies or electronic control units.
    In order to increase the heat dissipation capacity of heat sinks, it is known to use the convection heat transfer mechanism, either by natural convection, or by forced convection using a fan.
    However, this type of solution is not entirely satisfactory for several reasons. Generally a heat sink is not modular, that is to say that its dimensioning limits the heat dissipation to a fixed maximum value since its dissipation surface is fixed. In addition, natural convection generally does not allow the cooling pillars of the heat sink to be cooled uniformly. Forced convection generally requires a complex implementation of a bulky fan over all of the cooling pillars of the heat sink.
    Therefore, an object of the present invention is to provide a cooling pillar heat sink having improved heat dissipation capacity which overcomes the above mentioned problems. Other objects and advantages of the present invention will become apparent from the following description.
    SUMMARY OF THE INVENTION
    An electronic assembly comprising a cooling device comprises a cooling plate equipped on its upper face with a plurality of cooling pillars; a first printed circuit card comprising at least one heat generating zone bearing against the underside of the cooling plate; each pillar comprising a ventilation means comprising a hub equipped with blades, the blades being arranged axially along each pillar so as to be able to rotate around the pillar thus creating a flow of air for cooling the pillars.
    Each hub can be rotatably mounted on a cooling pillar. Each cooling pillar can have a generally cylindrical shape with a circular base. Each cooling pillar may include at its free end a shoulder on which the hub is mounted in abutment. The blades can be formed by straight rods extending from the hub to their free end. Each straight rod may have a ventilation vane extending axially along each rod.
    The electronic assembly can also include a rotary drive device controlled by an electronic control circuit arranged on a second printed circuit board. The second printed circuit board can be arranged flat over the free ends of the cooling pillars. The electronic control circuit can be arranged on the face of the second printed circuit board opposite the hubs. Each hub can be rotatably mounted on the second printed circuit board. The rotary drive device can be of the electromagnetic type. The electromagnetic type rotary drive device can include, for each ventilation means: 3 coils arranged on the second printed circuit board forming a magnetic stator and 2 permanent magnets arranged on the hub forming a magnetic rotor.
    BRIEF DESCRIPTION OF THE DRAWINGS
    Other characteristics, objects and advantages of the invention will appear on reading the detailed description which follows, and with reference to the appended drawings, given by way of non-limiting example and in which:
    Figure 1 is a schematic perspective view of a cooling device comprising a plurality of cooling pillars according to the invention.
    FIG. 2 is a schematic perspective view of a first embodiment of a means for ventilating the cooling pillars of FIG. 1.
    Figure 3 is a schematic perspective view of a second embodiment of a means for ventilating the cooling pillars of Figure 1.
    Figure 4 is a schematic view of a first embodiment of an electronic assembly according to the invention comprising the cooling device of Figure 1 equipped with the ventilation means of Figure 2.
    Figure 5 is a schematic perspective view of a printed circuit board on which an electronic circuit for controlling the rotation of the ventilation means of the cooling pillars is mounted.
    FIG. 6 is a detailed schematic view of the winding of the control circuit of FIG. 5.
    Figure 7 is a schematic perspective view of the ventilation means of Figure 2 equipped with two permanent magnets.
    FIG. 8 is a schematic sectional view of the ventilation means of FIG. 7 mounted in rotation on the printed circuit board of FIG. 5.
    Figure 9 is a schematic view of a second embodiment of an electronic assembly according to the invention comprising the cooling device of Figure 1 equipped with ventilation means controlled in rotation by the electronic control circuit arranged on the card with the printed circuit of figure 5.
    DESCRIPTION OF THE PREFERRED EMBODIMENTS
    In order to facilitate the description, and without limitation, an orthogonal coordinate system comprising a longitudinal axis L, a transverse axis T and a vertical axis V is defined. Orientations "bottom", "top", "above", "below", "lower" and "upper" are defined in the vertical direction.
    According to Figure 1, a cooling device 10 provided for dissipating the heat of electronic component generating heat comprises a cooling plate 12 arranged in a horizontal plane defined by the longitudinal axis and the transverse axis. The cooling plate 12 is equipped on its upper face 14 with a plurality of cooling pillars 16.
    The cooling plate 12 is generally rectangular. Two side walls 18, 20 are arranged at two opposite ends of the cooling plate 12 so as to be able to keep the cooling plate 12 raised when it is placed, for example, on a housing bottom, and therefore so as not to crush the electronic components coming to bear against the underside 22 of the cooling plate 12.
    The cooling pillars 16 are arranged perpendicular to the cooling plate 12 and protrude in the direction of the vertical axis therefrom. According to the embodiment shown, the cooling pillars 16 are arranged in aligned rows on the cooling plate 12. The cooling pillars 16 could also be arranged in offset rows. The cooling pillars 16 shown are generally cylindrical in shape with a circular base. Each cooling pillar 16 comprises at its free end 24, a shoulder 26 provided for receiving a hub of a ventilation means of the pillar 16 mounted in abutment against the shoulder 26. The shoulder 26 is produced by a restriction of the diameter of the circular base of the cylinder forming the pillar on a small portion of the free end 24 of the cooling pillar 16. The diameter of the circular base of the cylinder is called the main diameter dl, as opposed to the diameter of the portion of the free end 24, called secondary diameter d2.
    Alternatively, the pillars could be cylindrical in shape with a rectangular base. Alternatively, the pillars can be of uniform cylindrical shape, that is to say without their free ends 24 comprising a restriction forming a shoulder 26. In this case, a hub of a ventilation means can be mounted in abutment directly on the upper face 28 of the free end 24 of the pillar 16 or can also be rotatably mounted around the pillar 16 at the base of the pillar, that is to say in abutment on the upper face 14 of the cooling plate 12 .
    According to Figure 2, a first embodiment of a ventilation means 29 of the cooling pillar 16 is shown. The ventilation means 29 comprises a hub 30 fitted with blades 32. The hub 30 is of generally cylindrical shape with a circular base arranged in the horizontal plane. In order to be able to be inserted on a cooling pillar 16 as described according to FIG. 1, that is to say in order to come into abutment on the shoulder 26 of a cooling pillar 16, the hub 30 comprises at its center, on its underside (visible in FIG. 3), a blind hole 34 of complementary dimension with the secondary diameter d2 of the free end 24 of the cooling pillar 16.
    The blades 32 of the ventilation means 29 are formed by rectilinear rods 36 extending vertically downward from the periphery 38 of the hub 30. The rectilinear rods 36 are regularly distributed around the periphery 38 of the hub 30. Ideally the rods 36 are 6 or 8, depending on the main diameter dl of the cooling pillar 16.
    The hub 30 has a diameter of a dimension substantially greater than the main diameter dl of the cooling pillars 16, that is to say, having a diameter allowing the straight rods 36 to be able to rotate in rotation around the cooling pillar 16 by being arranged as close as possible thereto in order to create a flow of cooling air for the pillars 16.
    According to Figure 3, a second embodiment of a ventilation means 40 is shown. The ventilation means 40 shown comprises, in addition to the structure of the ventilation means 29 described through FIG. 2, blades 42 fixed on the straight rods 36. The blades 42 are in the form of rectangular pallets 44, one side of which extends vertically from the free end 46 of the straight rods 36 to the upper surface of the hub 30. The structure of this embodiment of the ventilation means 40 is comparable to that of a paddle wheel of a hydraulic device.
    According to Figure 4, a first embodiment of an electronic assembly 48 comprising the cooling device 10 of Figure 1 equipped with the ventilation means 29 of Figure 2 is shown. The electronic assembly 48 also includes a first printed circuit board 50 comprising an electronic component 52 which can generate heat. For cooling purposes, the electronic component 52 is supported on the underside 22 of the cooling plate 12. More generally, the invention is not limited solely to the cooling of an electronic component 52 which can generate heat , but extends to all the zones of a printed circuit board which can generate heat, the said zones which can generate heat which can also be in abutment against the underside 22 of the cooling plate 12 via 'a thermal paste.
    According to this first embodiment of the electronic assembly 48, each cooling pillar 16 of the cooling device 10 of FIG. 1 is equipped with the ventilation means 29 described in FIG. 2. The hub 30 of each ventilation means 29 is rotatably mounted on each cooling pillar 16 so as to be able to drive the blades 32 around the cooling pillar 16 on which it is mounted. More specifically, the cylindrical portion of secondary diameter d2 of the free end 24 of each cooling pillar 16 is inserted into the central blind hole 34 of each hub 30. The hub 30 is therefore mounted in abutment on the shoulder 26 formed by restriction of the diameter of the cooling pillar 16. The straight rods 36 of each ventilation means 29 extend vertically downward, along each cooling pillar 16 from the periphery 38 of the hub 30 to their own free ends 46 The free ends 46 of the rectilinear rods 36 are almost in contact with the cooling plate 12 so that they extend almost along the entire length, in the vertical direction, of the cooling pillar 16 on which the ventilation means 29 is mounted.
    This embodiment has several advantages in comparison with the prior art.
    When the device is subjected to an air flow in a direction allowing the rotation of the blades 32 of the ventilation means 29, the ventilation means 29 generate an air flow all around the cooling pillar 16, thus increasing their capacity heat dissipation, while without the ventilation means 29, the air flow cools only the part of the pillar 16 with which it comes into contact.
    It should be that in the case of a rotation of the blades 32 of the ventilation means by an air flow, the second embodiment of the ventilation means 40 described in FIG. 3, that is to say, the means ventilation 40 fitted with vanes 42, will prove to be more efficient but more bulky.
    In addition, in the case where the ventilation means 29, 40 is made of a heat conducting material, such as aluminum, the addition of ventilation means 29, 40 on each cooling pillar 16 makes it possible to increase the heat dissipation surface of the cooling device 10 and therefore increase the heat dissipation capacity of the cooling device
    10. It should also be noted that, in the case of a ventilation means 40 comprising blades 42 of aluminum, the useful heat dissipation area of the ventilation means 40 is also increased and therefore the heat dissipation of the electronic assembly 48 is improved.
    According to FIG. 5, a second printed circuit card 54 comprising an electronic control circuit 56 for rotation of the ventilation means 29, 40 is shown. The second printed circuit board 54 comprises, on a single face, a microcontroller 58, electronic switches 60 based on field effect transistors and magnetic coils 62. The control circuit 56 is a magnetic control circuit, such as a magnetic stator. The microcontroller 58 controls the switches 60 authorizing or not the passage of a current in the magnetic coils 62. The magnetic coils 62 are grouped by group of three coils 62. According to the embodiment, the magnetic coils 62 are shaped patterns of round spirals printed on the second printed circuit board 54. Each group of 3 coils 62 is provided for controlling a magnetic rotor.
    According to FIG. 5 and FIG. 6, the centers of the three spirals 64 are regularly arranged in a circle, and therefore spaced between them by an angle a of approximately
    120 degrees. More specifically, the centers 64 of the three spirals are arranged on a virtual circle 66, shown in dotted lines in FIG. 6, of radius substantially less than the radius of the cylindrical base of a hub of the ventilation means described in FIG. 2 so that the three coils 62 can be electromagnetically coupled to a magnetic rotor mounted on the hub 30 of the ventilation means 29, 40.
    Those skilled in the art will appreciate that other types of coils 62 may be quite suitable for controlling a magnetic rotor. Those skilled in the art will also agree that the control circuit 56 could be produced on several faces of a multilayer printed circuit.
    The ventilation means 66 of FIG. 7 differs only from that shown in FIG. 2 in that magnetic elements 68 are mounted on the hub 30. More specifically, two permanent magnets 70, 72 of opposite polarity (North-South) are arranged on the hub 30, such as a magnetic rotor, so as to cooperate with the coils 62 of the electronic control circuit 56.
    According to FIG. 8, the second printed circuit board 54 equipped with the electronic control circuit 56 described in FIG. 5 is fixed to the ventilation means 66 described in FIG. 7. A device for driving in rotation 74 of the ventilation means 66 is formed. It includes the electronic control circuit 56 of the second printed circuit board 54, the coils 62 of which are electromagnetically coupled to the two permanent magnets 70, 72 of the ventilation means 66. In order to optimize the performance of the rotary drive device 74, the ventilation means 66 equipped with the two permanent magnets 70, 72 is mounted in rotation on the second printed circuit board 54 so that the two permanent magnets 70, 72 are arranged opposite and as close as possible to the group of three coils 62 of the electronic control circuit 56. A means of rotationally fixing 76 of the ventilation means 66 connects the second printed circuit board 54 to ventilation means 66 between the center of the virtual circle 66 on which the three are arranged coils 66 and the axis of rotation of the hub 30 of the ventilation means 66.
    Alternatively, the rotational drive of the ventilation means 29, 40 could be done by non-magnetic devices, such as for example mechanical devices.
    According to Figure 9, a second embodiment of an electronic assembly 76 is shown. This differs from the first embodiment in that each hub 30 of the ventilation means 66 rotatably mounted on a cooling pillar 16 is equipped with two permanent magnets 70, 72 of opposite polarity as described in FIG. 7. According to this second embodiment, the hub 30 of each ventilation means 66 is also rotatably mounted on the second printed circuit card 54. The second printed circuit card 54 is therefore placed flat over the cooling pillars 16, but it is not in direct contact with the cooling pillars 16. In fact, according to the embodiment described in FIG. 2 and in FIG. 3, the hub 30 comprises in its center, on its lower face, a hole blind 34 and not a through hole.
    However, an alternative to this embodiment could consist in that the hub 30 is equipped in its center with a through hole and that the free end 24 of the cooling pillar 16 is of sufficiently large dimension in the vertical direction so that it can extend in the vertical direction beyond the hub 30. Thus, the cooling pillars 16 could serve as holding pads for the second printed circuit card 54.
    Alternatively, the ventilation means 40 described in FIG. 3, that is to say comprising vanes 42, can also be fitted with permanent magnets 70, 72 on its hub 30 and therefore can also be mounted on the cooling pillars 16 of the embodiment of FIG. 9. In addition to increasing the air flow around the cooling pillars 16, the blades 42 can allow a ventilation means 66 whose drive device 74 is defective, to continue to rotate around the pillar 16 on which it is mounted by taking advantage of the neighboring air flows generated by the ventilation means 66 nearby.
    ίο
    权利要求:
    Claims (12)
    [1" id="c-fr-0001]
    CLAIMS:
    E Electronic assembly (48, 76) comprising a cooling device (10) comprising a cooling plate (12) equipped on its upper face (14) with a plurality of cooling pillars (16);
    a first printed circuit board (50) comprising at least one heat generating zone (52) bearing against the underside (22) of the cooling plate (12);
    characterized in that each pillar (16) comprises a ventilation means (29) comprising a hub (30) equipped with blades (32), the blades (32) being arranged axially along each pillar (16) so as to be able rotate around the pillar (16) thereby creating a flow of cooling air from the pillars (16).
    [2" id="c-fr-0002]
    2. Electronic assembly (48, 76) according to the preceding claim characterized in that each hub (30) is rotatably mounted on a cooling pillar (16).
    [3" id="c-fr-0003]
    3. Electronic assembly (48, 76) according to claim 2 characterized in that each cooling pillar (16) has a generally cylindrical shape with a circular base.
    [4" id="c-fr-0004]
    4. Electronic assembly (48, 76) according to any one of the preceding claims, characterized in that each cooling pillar (16) comprises at its free end (24) a shoulder (26) on which the hub (30) is mounted in abutment .
    [5" id="c-fr-0005]
    5. Electronic assembly (48, 76) according to any one of the preceding claims, characterized in that the blades (32) are formed by straight rods (36) extending from the hub (30) to their free end (46 ).
    [6" id="c-fr-0006]
    6. Electronic assembly (48, 76) according to claim 5 characterized in that each straight rod (36) has a ventilation vane (42) extending axially along each rod (36).
    [7" id="c-fr-0007]
    7. Electronic assembly (48, 76) according to any one of the preceding claims, characterized in that it comprises a rotary drive device (74) controlled by an electronic control circuit (56) arranged on a second card to printed circuit (54).
    [8" id="c-fr-0008]
    8. Electronic assembly (48, 76) according to claim 7 characterized in that the second printed circuit board (54) is arranged flat over the free ends (24) of the cooling pillars (16).
    [9" id="c-fr-0009]
    9. Electronic assembly (48, 76) according to claim 8 characterized in that the electronic control circuit (56) is arranged on the face of the second printed circuit board (54) opposite the hubs (30 ).
    [10" id="c-fr-0010]
    10. Electronic assembly (48, 76) according to claim 8 or 9 characterized in that each hub (30) is rotatably mounted on the second printed circuit board (54).
    [11" id="c-fr-0011]
    11. Electronic assembly (48, 76) according to any one of claims 7 to 10 characterized in that the rotary drive device (74) is of the electromagnetic type.
    [12" id="c-fr-0012]
    12. Electronic assembly (48, 76) according to claim 11 characterized in that the rotary drive device (74) of the electromagnetic type comprises for each ventilation means (66):
    3 coils (62) arranged on the second printed circuit board (54) forming a magnetic stator;
    2 permanent magnets (70, 72) arranged on the hub (30) forming a magnetic rotor.
    1/5
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    同族专利:
    公开号 | 公开日
    FR3063864B1|2019-07-05|
    CN108575074B|2020-06-02|
    US20180263106A1|2018-09-13|
    US10237966B2|2019-03-19|
    EP3373716A1|2018-09-12|
    EP3373716B1|2021-05-05|
    CN108575074A|2018-09-25|
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    法律状态:
    2018-03-26| PLFP| Fee payment|Year of fee payment: 2 |
    2018-09-14| PLSC| Search report ready|Effective date: 20180914 |
    2020-03-23| PLFP| Fee payment|Year of fee payment: 4 |
    2021-03-26| PLFP| Fee payment|Year of fee payment: 5 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1751937A|FR3063864B1|2017-03-09|2017-03-09|ELECTRONIC DEVICE FOR A MOTOR VEHICLE|
    FR1751937|2017-03-09|FR1751937A| FR3063864B1|2017-03-09|2017-03-09|ELECTRONIC DEVICE FOR A MOTOR VEHICLE|
    EP18158714.8A| EP3373716B1|2017-03-09|2018-02-26|Electronic device for a motor vehicle|
    CN201810186000.3A| CN108575074B|2017-03-09|2018-03-07|Electronic assembly|
    US15/914,228| US10237966B2|2017-03-09|2018-03-07|Electronic device for a motor vehicle|
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