Apparatus for electronic cooling on an autonomous device
An apparatus to cool electronics in an autonomous vehicle, where the autonomous vehicle includes significant computing power to receive data from on-board sensor, cellular data and user interactions and to navigate an environment to a predetermined location. The cooling system includes a radiator, fan, pump and cold plate. The cold plate is formed from two plates with extended surfaces that are mated together so that the cavities around the extended surfaces form a flow passage. The electronics processing the data and navigating are mounted on the outside surface of the cold plate.
1. A cold plate for cooling electronics in an autonomous vehicle comprising:
a first plate comprising:
a first side including:
an inlet port;
an outlet port; and
a plurality of cooling mounts, each cooling mount configured to receive an electronic package, each electronic package defining a first portion of the first side;
a second side including:
two or more parallel flow paths that fluidly connect the inlet port to the outlet port; and
a plurality of arrays of extended surfaces in the flow paths, wherein each array of extended surfaces is limited to a second portion of the second side directly opposite the first portion; and
a second plate sealably attached to the first plate to create a second two or more liquid passages between the first and second plate, the two or more passages connect the inlet port to the outlet port.
2. The cold plate of claim 1 wherein the extended surfaces are staggered round pins.
3. The cold plate of claim 1 wherein the extended surfaces are staggered oval pins.
4. The cold plate of claim 1 wherein the extended surfaces are straight fins with breaks in the fins.
5. The cold plate of claim 1 wherein the extended surfaces are staggered arrays of molded shapes.
6. The cold plate of claim 1 wherein the second side defines two parallel flow paths between the inlet and outlet ports.
7. The cold plate of claim 6 , wherein the first flow path and the second flow path of the two parallel flow paths each comprise an equal number of extended surface arrays.
8. The cold plate of claim 1 wherein each array of extended surfaces includes an entrance region for receiving liquid, wherein the extended surfaces in the entrance region are further apart than in the rest of the array.
9. The cold plate of claim 1 , wherein each of the two or more flow paths narrows between each array of the extended surfaces.
10. The cold plate of claim 8 , wherein the entrance region does not contain the extended surfaces for heat transfer.
11. The cold plate of claim 8 , further comprising a fairing in the entrance region.
12. The cold plate of claim 10 , wherein the fairing is a cylinder with an axis perpendicular to the first plate.
13. The cold plate of claim 10 , wherein the entrance region is triangular.
14. The cold plate of claim 1 , further comprises an O-ring seal between the first plate and the second plate.
15. A cooling system for electronics in an autonomous vehicle comprising:
a radiator including a liquid passage and external fins;
a fan adjacent to the heat exchanger, the fan forcing a portion of ambient air past the external fins;
a cold plate comprising
a first plate comprising:
a first side including:
an inlet port fluidly connected to the radiator liquid passage;
an outlet port fluidly connected to the radiator liquid passage; and
a plurality of cooling mounts, each cooling mount configured to receive an electronic package, each electronic package defining a first portion of the first side;
a second side including:
two or more parallel flow paths that fluidly connect the inlet port to the outlet port; and
a plurality of arrays of extended surfaces in the flow paths, wherein each array of extended surfaces is limited to a second portion of the second side directly opposite the first portion; and
a second plate sealably attached to the first plate to create a second two or more liquid passages between the first and second plate, the two or more passages connect the inlet port to the outlet port; and
a pump fluidly connected to the radiator fluid passage and the cold plate, wherein the pump moves liquid through the radiator liquid passage and the parallel flow paths in the cold plate.
16. The cooling system of claim 15 wherein the first flow path and the second flow path of the two or more parallel flow paths in the cold plate each comprise an equal number of extended surface arrays.
17. The cooling system of claim 15 wherein each array of extended surfaces include an entrance region for receiving the liquid, the entrance region being characterized by extended surfaces that are further apart than in the rest of the array.
18. The cooling system of claim 15 wherein each of the two or more flow paths in the cold plate narrows between each array of extended surfaces.
19. The cooling system of claim 15 wherein each array of extended surfaces include an entrance region without extended surfaces for heat transfer.
20. The cooling system of claim 19 , further comprising a cylindrical fairing located within the entrance region of each array.