Water-cooled Copper-clad Invar Hybrid Power Circuit

Water cooling of hybrid modules allows a power dissipation much higher than that of conventional methods. This paper describes the design and construction of a copper-clad Invar water-cooled hybrid power circuit intended for use in a medical hand-held tool which is a 25 mm diameter cylinder. The thermal study demonstrates the interest of a copper-clad Invar heat exchanger: water flowing at a rate lower than 15 Ih−1 allows the dissipation of more than 50 W in the module while keeping the external temperature of the tool below 35°C.