Patent ID: 8276394

Claim:
A passive heat sink for use with a fan for cooling an electronic component, comprising: a shell with a heat transfer surface for mounting adjacent a heat generating surface of the electronic component, wherein the shell further comprises a heat exchanger portion spaced apart from the heat transfer surface for positioning in an airflow provided by the fan; a generator compartment within the shell with a generator vessel for containing fluid; a volume of absorbent in the generator vessel, wherein the generator compartment includes a heat conductive path between the heat transfer surface and the generator vessel, whereby heat received at the heat transfer surface is transferred to the absorbent; an absorber compartment within the shell positioned adjacent to the generator compartment, whereby an absorption refrigeration cycle operates within the shell upon a quantity of heat being provided to the heat transfer surface; and a bubble pump with an inlet in the generator vessel and an outlet in the absorber compartment, wherein the outlet of the bubbles in the heat exchanger portion of the shell.