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:
Nov. 24, 1992
Filed:
Jul. 24, 1991
Haruyoshi Mori, Kobe, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A switching apparatus including a plurality of semiconductor switching elements each of which has a pair of main circuit electrodes and a control electrode. Each load-side electrode of the pair of main circuit electrodes of each semiconductor switching element is connected in common and the control electrodes are controlled by a common control power supply so as to control the conductance between the main circuit electrodes. A transformer having a first coil and a second coil of the same polarity as the first coil is connected to each of the semiconductor switching elements. The first coil is inserted between the control signal source and the load-side main circuit electrode, and the second coil is inserted between the control signal source and the control electrode.