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:
Dec. 11, 1984
Filed:
Sep. 13, 1982
Masahiko Akamatsu, Amagasaki, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A semiconductor switch device is disclosed with a main current passing through a main current path and a main semiconductor switch which has control electrode and a main electrode inserted into the path. A first winding is inserted into the electric path and a second winding is magnetically coupled to the first winding through a core and is connected between the control electrode and one main electrode of the main semiconductor switch. A third winding having a number of turns greater than the second winding is likewise magnetically coupled to said first winding. An auxiliary semiconductor switch is connected between both ends of the third winding and cooperates with a pulse signal input to provide a starting signal to the control electrode in the main semiconductor switch so that the auxiliary semiconductor switch is controlled in order to short-circuit both ends of the third winding and the control currents supplied by the first winding through the second winding is thereby cut off to turn off the main semiconductor switch.