Heat sink for electrical components

Details Heat sink for electrical components Heat sink for electrical components

H - Electricity

05

K

356/113, 347/5

H05K 7/20 (2006.01) H01L 23/467 (2006.01)

Patent

CA 1130431

ABSTRACT OF THE DISCLOSURE A heat sink for cooling electrical components with cooling gas, wherein the cooling gas flows through the heat sink in closed cooling pas- sages from entrance openings to exit openings and the cross-sections of the passages increase from the entrance openings to the exit openings. The heat sink is built up, for example, of cooling fins arranged between two base surfaces. The shape of the cooling fins is such that their thickness dec- reases from the entrance openings to the exit openings, while the height of the cooling canals increases in the same direction. Alternatively, the cooling fins may diverge, fan-like, towards the exit openings. In one em- bodiment, the heat sink is made as a block having holes serving as cooling ducts, and the diameter of the holes increases toward the exit openings. The increasing cross-section of the cooling passages in the heat sink results in expansion of the cooling gas as it flows, and the temperature of the cooling gas decreases in accordance with the pressure conditions and, thus, more heat is removed from the heat sink.

323711

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