Electronic device for a motor vehicle
View Patent ↗An electronic assembly including a cooling device comprises a cooling plate equipped, on its upper face, with a plurality of pin-fins; a first printed circuit board including at least one heat-generating zone bearing against the lower face of the cooling plate; each pin including a blowing means comprising a hub equipped with blades, the blades being arranged axially along each pin so as to be able to rotate about the pin, thus creating a flow of air for cooling the pins.
1. An electronic assembly comprising:
a cooling device comprising a cooling plate equipped, on its upper face, with a plurality of pin-fins; and
a first printed circuit board including at least one heat-generating zone bearing against a lower face of the cooling plate, wherein each pin-fin includes a blowing means comprising a hub equipped with blades, the blades being arranged axially along each pin-fin so as to be able to rotate about the pin-fin to create a flow of air for cooling the pins.
2. The electronic assembly according to claim 1 , wherein each hub is mounted so as to be able to rotate on a pin-fin.
3. The electronic assembly according to claim 2 , wherein each pin-fin has a cylindrical overall shape with a circular base.
4. The electronic assembly according to claim 1 , wherein each pin-fin comprises, at a free end of each pin-fin, a shoulder on which the hub is mounted in abutment.
5. The electronic assembly according to claim 1 , wherein the blades are formed by rectilinear rods extending from the hub as far as their free end.
6. The electronic assembly according to claim 5 , wherein each rectilinear rod includes a blowing blade extending axially along each rod.
7. The electronic assembly according to claim 1 , wherein the electronic assembly comprises a rotation-driving device controlled by an electronic control circuit arranged on a second printed circuit board.
8. The electronic assembly according to claim 7 , wherein the second printed circuit board is arranged flat level above the free ends of the pin-fins.
9. The electronic assembly according to claim 8 , wherein the electronic control circuit is arranged on the face of the second printed circuit board, facing the hubs.
10. The electronic assembly according to claim 8 , wherein each hub is mounted in rotation on the second printed circuit board.
11. The electronic assembly according to claim 7 , wherein the rotation-driving device is electromagnetic.
12. The electronic assembly according to claim 11 , wherein the electromagnetic rotation-driving device comprises, for each blowing means, three coils arranged on the second printed circuit board, forming a magnetic stator; and
two permanent magnets arranged on the hub, forming a magnetic rotor.