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:
May. 11, 1993
Filed:
Aug. 07, 1989
Applicant:
Inventors:
Shin Kimura, Hitachi, JP;
Norikazu Tokunaga, Hitachi, JP;
Nobuyoshi Mutoh, Katsuta, JP;
Satoshi Ibori, Funabashi, JP;
Shuuji Musha, Hitachi, JP;
Yasuo Matsuda, Hitachi, JP;
Yutaka Suzuki, Hitachi, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03K / ; H03K / ; H02M / ;
U.S. Cl.
CPC ...
318727 ; 318798 ; 318138 ; 361 93 ; 361 98 ; 307270 ;
Abstract
An ON holding circuit is provided which outputs a signal which identifies an ON state of an insulated gate transistor to a gate voltage input circuit, and inhibits the gate voltage input circuit from being responsive to an input signal which identifies an OFF state of the insulated gate transistor when an overcurrent adjusting circuit operates continuously.