Miniature fluid-cooled heat sink with integral heater
View Patent ↗A temperature control device that includes a miniature liquid-cooled heat sink with integral heater and sensing elements is used as part of a system to provide a controlled temperature surface to an electronic device, such as a semiconductor device, during the testing phase. The temperature control device includes an interface surface configured to provide a thermal path from the device to a device under test. One such device has a liquid-cooled heat sink comprising a first heat transfer portion in a first plane and a second heat transfer portion in a second plane. The first and second heat transfer portions establish a three-dimensional cross-flow of coolant within the heat sink structure. An alternate embodiment includes parallel fluid conduits, each having a three-dimensional microchannel structure that directs coolant flow in three dimensions within the fluid conduits. Coolant flows in opposite directions through adjacent fluid conduits, thus resulting in a three-dimensional cross-flow within the heat sink structure.
1. A temperature control device, comprising:
an interface surface configured to provide a thermal path to a device under test (“DUT”);
a fluid-cooled heat sink having at least a first layer residing in a first plane and a second layer residing in a second plane, in which a coolant flows through a first cooling passage and across the first layer residing in the first plane and in which coolant flows through a second cooling passage and across the second layer residing in the second plane, said first plane being closer to said interface surface than said second plane; and
one or more integral heater assemblies.
2. A temperature control device according to claim 1 , further comprising one or more thermal sensing elements.
3. A temperature control device according to claim 1 , wherein said first layer includes one or more flow channels and said second layer includes one or more flow channels.
4. A temperature control device according to claim 1 , wherein said first layer has a flow path in a first direction and said second layer has a flow path in a second direction.
5. A temperature control device according to claim 4 , wherein said flow path in said first direction is opposite to said flow path in said second direction.
6. A temperature control device according to claim 1 , wherein said one or more integral heater assemblies are planar and parallel to said interface surface.
7. A temperature control device according to claim 1 , wherein said one or more integral heater assemblies includes a substrate and at least one heating element formed on said substrate.
8. A temperature control device according to claim 7 , wherein said at least one heating element comprises one or more electrically resistive serpentine traces.
9. A temperature control device according to claim 1 , wherein each of said one or more integral heater assemblies has an independently adjustable power level.
10. A temperature control device according to claim 1 , wherein said one or more integral heater assemblies are positioned between said interface surface and said fluid-cooled heat sink.
11. A temperature control device according to claim 1 , wherein said fluid-cooled heat sink further includes a cover layer with a first sub-layer having a first inlet and a first outlet for a first cooling passage and a second inlet and a second outlet for a second cooling passage.
12. A temperature control device according to claim 11 , wherein said cover layer includes a second sub-layer having first and second openings positioned to provide a continuous passage for the second cooling passage with the second inlet and the second outlet, respectively, and having first and second fluid openings positioned to provide a continuous passage for the first cooling passage with the first inlet and the first outlet, respectively.
13. A temperature control device according to claim 12 , wherein said cover layer includes a third sub-layer having third and fourth fluid openings positioned to provide a continuous passage for the first cooling passage with the first and second fluid openings, respectively, and having fifth and sixth fluid openings positioned to provide a continuous passage for the second cooling passage with the first and second openings, respectively.
14. A temperature control device according to claim 13 , wherein said first layer includes seventh and eight fluid openings positioned to provide a continuous passage for the first cooling passage with the third and fourth fluid openings, respectively.
15. A temperature control device according to claim 14 , wherein a flow path of the first cooling passage provides coolant in a first direction through the second layer, and a flow path of the second cooling passage provides coolant in a second direction, different from the first direction, through the first layer.