Temperature Swing Issue, How a Passive Two-Phase Cooling Loop Can Improve the Power Electronic Lifetime

Inhalt:
Capillary Loops (CPL or LHP) can be used for passive cooling of high power electronics and are characterized by a variable heat transfer coefficient as a function of power i.e. if no power is applied no heat is transferred. This unique behavior associated with cold plate thermal inertia can be used to smooth the virtual junction cycling amplitude. The present paper describes the power duty cycle conditions and capillary evaporator characteristics (thermal inertia, heat transfer coefficient – HTC –, etc.) that permit to increase the power module lifetime compared with the active standard liquid cooling solutions.