Miniature Liquid Cold-plate Enabled by Metal Spraying: A Thermal Management Solution for a Modular 1 kW Bi-directional GaN-based dc-ac Converter
2022 IEEE Applied Power Electronics Conference and Exposition (APEC)(2022)
Abstract
In recent years, power electronic systems have been consistently required to achieve higher power while also minimizing footprint. Addressing these demands has produced new electro-thermal challenges within these highly coupled systems. This work utilizes metal spraying techniques to fabricate a custom miniature liquid cold-plate to cool a 1 kW high-frequency bi-directional GaN-based dc-ac converter. A commercially sourced ‘off-the-shelf’ cold-plate, comprised of a serpentine copper tube embedded in an aluminum block and buried in low thermal conductivity epoxy is used as a baseline to compare the thermal performance of the proposed cold-plate. Experimental results show that the metal sprayed cold-plate yields lower junction temperatures at the same flow rate while also decreasing volume and mass when compared to the off-the-shelf system.
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Key words
Thermal management,liquid-cooling,power electronics,metal spraying,GaN HEMTs cooling
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