The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 15, 1987
Filed:
Apr. 09, 1986
Hiroshi Itahana, Katsuta, JP;
Yoshinori Usui, Katsuta, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A semiconductor stack is composed of a GTO thyristor, cooling members and wiring conductors which are stacked and tightened together. The semiconductor stack is disposed horizontally in a cooling vessel, and the vessel is filled with a Freon liquid. A condenser is disposed above the cooling vessel and is connected to the cooling vessel by a communication tube, to constitute a cooling apparatus. Each cooling member has a large number of small holes between the GTO thyristor and the wiring conductors between which the cooling member is disposed. The Freon is boiled in the small holes by the heat generated at the GTO thyristor, becomes Freon vapor, and is directed toward the corresponding wiring conductor. Each wiring conductor has a large number of longitudinal slits on the surface thereof which is in contact with the cooling member. The Freon vapor is made to flow upward along these slits by convection currents, thereby increasing the efficiency of the cooling cycle provided by the liquid Freon refrigerant.