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:
Apr. 13, 1976
Filed:
Jun. 19, 1974
Hiroshi Mitsuoka, Amagasaki, JA;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JA;
Abstract
An ignition apparatus for triggering a plurality of thyristors connected in series and/or in parallel is disclosed. The apparatus includes a high frequency power source, a switch for interrupting the output of the high frequency power source, a pulse generator, a gate transformer for supplying the output of the high frequency power source and the pulse current from the pulse generator to the gate of a thyristor, and a controlling device for controlling the switching time of the switch and the time of pulse-generation by the pulse generator. The switch and the pulse generator are controlled by the controlling device so as to feed a current pulse to the gate transformer from the pulse generator before the output of the high frequency power source is supplied to the gate transformer by actuating the switch. Thus, a gate current having a fast rise time, a desirably controlled time interval and a suitable amplitude is provided supplying a large output capacity for the ignition apparatus for simultaneously triggering the plurality of thyristors connected in series and/or in parallel. This apparatus eliminates the prior art requirement for employment of separate rectangular wave AC generators for each group of thyristors having the same ignition period.