Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F21—LIGHTING
  • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
  • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
  • F21S45/40—Cooling of lighting devices
  • F21S45/47—Passive cooling, e.g. using fins, thermal conductive elements or openings
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F21—LIGHTING
  • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
  • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
  • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
  • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
  • F21S41/141—Light emitting diodes [LED]
  • F21S41/147—Light emitting diodes [LED] the main emission direction of the LED being angled to the optical axis of the illuminating device
  • F21S41/148—Light emitting diodes [LED] the main emission direction of the LED being angled to the optical axis of the illuminating device the main emission direction of the LED being perpendicular to the optical axis
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F21—LIGHTING
  • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
  • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
  • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
  • F21S41/19—Attachment of light sources or lamp holders
  • F21S41/192—Details of lamp holders, terminals or connectors
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F21—LIGHTING
  • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
  • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
  • F21S45/40—Cooling of lighting devices
  • F21S45/42—Forced cooling
  • F21S45/43—Forced cooling using gas
  • F21S45/435—Forced cooling using gas circulating the gas within a closed system

Definitions

• TITLE Radiator with optimized cooling capacity for automotive vehicle headlight
• the invention applies to the field of cooling motor vehicle headlights.
• the invention relates to a radiator intended to ensure the cooling of optical modules fitted to motor vehicles and the heat dissipation capacity of which is optimized.
• Automotive vehicle lighting systems include optical modules with electronic components which tend to heat up (LED lamps, printed circuits, etc.). These modules are therefore provided with cooling means in order to guarantee their correct operation in the presence of strong thermal stresses.
• these cooling means comprise associated radiators, if the heat dissipation by convection proves to be insufficient, with additional means, for example, fans which make it possible to force the air flow towards the components electronic.
• a light-emitting diode motor vehicle lighting module comprises a housing in which are housed a connected headlight and a radiator provided with at least a cooling channel from an air inlet located at the front of the projector.
• patent application FR3033622 describes a motor vehicle headlight provided with a radiator formed from a metal sheet with a plurality of folds, each forming a heat dissipation fin.
• an automatic cut-off of the power supply is generally provided or, at least, a reduction in the power of the lighting module, which is prejudicial to the safety of the vehicle.
• the invention aims to provide a technical solution to ensure effective cooling of all the electronic components of the projector by optimizing the convection capacity of the radiator by a better distribution of its dissipation surfaces of the heat.
• This object is achieved by means of a radiator with optimized convection capacity for cooling a motor vehicle headlight comprising at least two electronic components supported and fixed, respectively, on a lower bearing and an upper bearing of the radiator , each having a heat dissipating surface, characterized in that said radiator comprises low openings and high openings passing through said bearings and opening onto each bearing at its heat dissipation surface.
• the radiator comprises lateral fins and underlying fins extending perpendicularly and under the lower bearing.
• the bottom openings are formed of parallel slots opening out, on the one hand, between the underlying fins and on the other hand, on a projecting part of the lower bearing.
• the bottom openings are provided on either side of the lower landing.
• the upper openings open out, for their part, on the inner rim of the upper bearing.
• the upper openings are formed of grooves extending between the respective dissipation surfaces of the lower bearing and of the upper bearing.
• the lower bearing is spaced from its dissipation surface by being delimited by bevelled notches while the upper bearing is coplanar with its dissipation surface.
• the upper bearing is divided into two side plates flanking the lower bearing which extends beyond the rim of the upper bearing.
• Another object of the invention is a motor vehicle headlight equipped with a cooling radiator with optimized convection capacity having the characteristics defined above.
• the radiator of the invention provides efficient and rapid cooling of the electronic components (and, in particular, of the printed circuit boards), fixed on its two bearings thanks to the openings which make it possible to avoid the disturbance of the flow of heat transfer air.
• the calories released by the electronic components are evacuated either by convection to the outside, or by circulation of pulsed air through the radiator by means of an auxiliary fan.
• the presence of the openings also makes it possible to lighten the radiator while increasing the total dissipation surface.
• the radiator of the invention also offers an economic gain by using a smaller amount of on-board material. [0025] The radiator of the invention thus contributes to improving the quality by reducing the risks of electronic failure and by simplifying the protection of electronic components.
• FIG. 1 is a perspective overview of a motor vehicle headlight provided with an embodiment of the improved radiator of the invention.
• FIG. 2A is an exploded perspective view of the embodiment of the radiator of FIG. 1 before assembly of the electronic boards.
• FIG. 2B is a perspective view of the embodiment of the radiator of FIG. 2A after assembly of the electronic boards.
• FIG. 3 is a top view of the heat sink of FIGS. 2A and 2B before fixing the electronic boards.
• FIG. 4A is a partial sectional view of a projector equipped with the radiator of the invention.
• FIG. 4B is a partial sectional view of a projector equipped with the inventive radiator and an auxiliary fan.
• the invention relates to the field of cooling headlights integrated into lighting and signaling systems fitted to motor vehicles. More particularly, the invention is concerned with optimizing the ability of the radiator to dissipate the heat produced by the electronic boards of the projector module.
• FIG. 1 shows a projector P equipped with a radiator 1 intended to cool at least two electronic components and here two printed circuit boards C1, C2 supported and fixed, respectively, on a lower bearing la and an upper bearing lb radiator 1.
• the radiator 1 comprises, of traditionally, side fins 12 and underlying fins 13 which extend perpendicularly and under the lower bearing 1a.
• the radiator can receive more than two flat electronic components and, in such an alternative embodiment, the radiator would include as many bearings as it there would be components, each bearing being associated with a heat dissipation surface.
• the lower openings 10a are here formed by parallel slots opening out, on the one hand, between the underlying fins 13 and on the other hand, on a projecting portion ld of the lower bearing la. These low openings are provided on both sides on the other side of the lower bearing 1a and of its dissipation surface 11a, also being present on the bottom of the groove 1c, as illustrated in FIG. 3.
• the slots forming the bottom openings 10a are distributed between short slots and longer slots extending to the landing 1a of the card C1.
• the top openings 10b are here formed of grooves extending between the respective dissipation surfaces 11a, 11b of the lower bearing la and of the upper bearing lb.
• the top openings 10b open onto the inner rim of the upper bearing lb.
• the lower bearing la is spaced from its dissipation surface 11a while the upper bearing lb is coplanar with its dissipation surface 11b.
• the lower bearing la is delimited by the bevelled notches carried by the inner side wall of the radiator 1 and the widened end of which ends above the dissipation surface 11a.
• the card C1 is thus supported and wedged by the notches le. above its dissipation surface 11a.
• the upper bearing lb is, in turn, divided into two side plates flanking the lower bearing 1a and separated by a groove 14 extending between the dissipation surface 1a and the outside of the radiator 1.
• the lower openings 10a are thus arranged around the first electronic card Cl (relative to the direction of convection) and the flow of hot air, escaping to the outside through these openings, then comes, via the top opening 10b, near the second electronic card C2, as illustrated in FIG. 4A.
• the latter delivers a pulsed air flow which rushes into the radiator 1, first upwards in the lower openings 10a to enter the space located between the dissipation surface 11a and the bearing 1a of the card C1.
• the air charged with the calories released by the card Clse then directs, via the top openings 10b, to the dissipation surface 11b of the card C2 to ventilate and cool it.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Microelectronics & Electronic Packaging (AREA)
• Optics & Photonics (AREA)
• Cooling Or The Like Of Electrical Apparatus (AREA)
• Non-Portable Lighting Devices Or Systems Thereof (AREA)
• Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=68138588

Family Applications (1)

Country Status (4)

Citations (8)

Family Cites Families (5)

• 2019
  • 2019-09-05 FR FR1909755A patent/FR3100600A1/fr active Pending
• 2020
  • 2020-08-17 WO PCT/FR2020/051473 patent/WO2021044090A1/fr unknown
  • 2020-08-17 CN CN202080062156.6A patent/CN114341548B/zh active Active
  • 2020-08-17 EP EP20775369.0A patent/EP4025828B1/fr active Active

Patent Citations (8)

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