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Liquid Cooled Cold Plates
Aluma Cop

Vette Thermal Technologies
Aluma-Cop Cold Plate Technology

Patent Pending (Proprietary information)

Aluma-Cop Applications

An IGBT or Mosfet die assembly could be directly solder attached to the tube onto one or both faces of the tube. The soldering operation could be preformed by, blowing superheated air through the tube. I believe this soldering method would produce an attachment boundary that has less air voids than normal.

As with any new approach, we developed more innovative ways in which to assemble different types of liquid cooled cold plates and heat exchangers.

Figure 3.0 shows a pair of rectangular cooling tubes press-fitted into aluminum ‘carrier’ block, which would cool an array of power electronic switching modules. The tubes are bonded in place using an aluminum filled epoxy in order to fill any air gaps, which may occur. The bonding provides a thermal path to the block for a larger cooling mass.

Aluma Cop Applications

The technique of pressing and bonding copper tubes into aluminum structure in order to produce cold plate assemblies has been done for a number of years by AAVID Corporation.

 

Vette Thermal Technologies Inc.
Proprietary Information

What makes Vette cold plate unique is the tube itself. By forming a tube in such a shape it presents a larger, wider ‘cold’ surface area to the devices or modules that require cooling. And, by having a cross-sectional aspect ratio of greater than four to one, and having integral forged fins internally, it creates a flow channel that is optimized for the fin pitch and fin height to width ratios. These parameters provide a cooling system that is much greater in performance than what has been achieved by AAVID by simply pressing a smooth bore round copper tube into an aluminum plate.

By the fact that the tube could provide sufficient cooling to a power module without the aluminum carrier block, a simpler, cheaper cooling system, or kit could be produced.

This would allow the end user to position the switching array at any geometry by simply loosening the clamps and sliding the modules into their desired position at any time during the product assembly sequence.

Figures 4.0 and 5.0 depict a two clamp attachment systems whereby power modules could be, mounted to the cooling tubes.

Aluma-Cop Applications
Aluma Cop Applications


Another clamping system is to cross a tube exchanger between a double set of IGBT modules. This results in a high-density switch stage assembly that could not be achieved with traditional heat exchangers. The fact that the tube presents a double-sided cold surface along with its increased surface area is what makes the higher packaging density possible. See figure 6.0

Aluma-Cop Applications

Other applications include the heat sinking of high power magnetic assemblies. This was performed for one of our contacts by compression mounting a system of manifolded tubes against the sides of the magnetic cores of the chokes. See figure 7.0

Aluma Cop Applications

It may also be possible to cool motor windings using the tube. A radial array of tubes would manifold together at both ends, and then placed against the outer surface of any given winding. Again, this presents a greater surface area to the surface requiring cooling than any round flow tube would.

The tube could also be formed or rolled into a circular form and then around a winding axially.

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An Vette Liquid Cooled Cold Plate Includes:

  • Aluminum extended with copper tubes

  • Aluminum machined with copper tubes

  • Copper with tubes

  • Copper machined

  • Liquid cooled with forced air back up

  • Maximum size 64" x 32"

  • Standard Features:
    RMS surface finish 64 max.

  • Pressure testing standard

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