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. 28, 2002
Filed:
Apr. 25, 2000
Michiyoshi Sonoda, Tokyo, JP;
Ryo Otsubo, Tokyo, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
When an over-current is detected as flowing in semiconductor devices of a power converter by a Hall CT (current transformer), an abnormality detection unit outputs an abnormality signal. If the abnormality signal is output from the abnormality detection unit, a gate breaking unit of a gate driving unit outputs a gate breaking signal to stop the power converter. At the same time, a gate ON unit maintains the gate signal of the semiconductor device that has become abnormal in the ON state and, after the current in the semiconductor device has become smaller than a specified value, the gate signal of the semiconductor device is rendered OFF by a gate constriction device. By this operation, the current flowing in the semiconductor device may be reduced prior to any gate breaking operation occurring.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile