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:
Mar. 18, 2003
Filed:
Mar. 11, 2002
Takeaki Asaeda, Tokyo, JP;
Hiroshi Masunaga, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
In a gate control device for four self-arc extinction elements connected in series and two self-arc extinction elements connected in reverse parallel between the respective terminals of clamp diodes, individually, there is provided a PWM circuit that generates conduction control commands, and a gate control circuit including a delay circuit group that generates gate signals with respect to the respective self-arc extinction elements on the basis of respective conduction control commands. A pair of the self-arc extinction elements are rendered conductive at the same time, and another pair of the self-arc extinction elements are rendered conductive at the same time.