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:
Aug. 11, 2009
Filed:
Nov. 20, 2007
Applicant:
Kuniaki Mamitsu, Okazaki, JP;
Inventor:
Kuniaki Mamitsu, Okazaki, JP;
Assignee:
DENSO CORPORATION, Kariya, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02H 3/22 (2006.01);
U.S. Cl.
CPC ...
Abstract
A power semiconductor device includes a power semiconductor element, a protection circuit, an inspection terminal, and an electrical conductor. The protection circuit includes multiple zener diodes connected in series between a gate and an emitter of the power semiconductor element. The protection circuit limits a voltage between the gate and emitter of the power semiconductor element, when an abnormal voltage is applied to the gate. The electrical conductor electrically connects the inspection terminal to a node between the zener diodes of the protection circuit. The zener diodes are separately inspected by using the inspection terminal.