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:
Jan. 01, 1991
Filed:
Oct. 14, 1988
Shigenori Yakushiji, Yokohama, JP;
Kouji Jitsukata, Chiba, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A MOSFET is provided between a main thyristor and an auxiliary thyristor for controlling the main thyristor. The source and drain regions of the MOSFET are also used as a first N-type emitter region of the main thyristor and a second N-type emitter region of the auxiliary thyristor. The MOSFET and the auxiliary thyristor are controlled by an output of a gate energization circuit. When the MOSFET is turned on by an output of the gate energization circuit, the main thyristor is connected to the auxiliary thyristor. At this time, the auxiliary thyristor is turned on by the output of the gate energization circuit, and the main thyristor is also turned on due to the turn-on operation of the auxiliary thyristor. When the MOSFET is in the OFF state, the main thyristor is electrically isolated from the auxiliary thyristor.