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:
Jun. 10, 1980
Filed:
Jan. 29, 1979
Patrick De Bruyne, Siggenthal, CH;
Roland Sittig, Umiken, CH;
BBC Brown Boveri & Company Limited, Baden, CH;
Abstract
A safety device for protecting a controllable high power semiconductor component having an anode, a cathode, and a control electrode, against excessive voltage rise rates dU/dt and comprising: a semiconductor body having at least four sequential zones of alternating and opposite conductivity type, the second sequential zone being provided with a high concentration region having a higher concentration of conductivity type determining impurities than the rest of the second sequential zone; a first emitter electrode contacting the first of the four sequential zones of the semiconductor body and adapted to be connected to the control electrode of the controllable high power semiconductor component; a second emitter electrode contacting the fourth of the four sequential zones of the semiconductor body and adapted to be connected to the anode of the controllable high power semiconductor component; a gate electrode contacting the high concentration region of the second sequential zone of the semiconductor body; and an ohmic conductor connected between the first emitter electrode and the gate electrode.