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:
Dec. 08, 1998
Filed:
May. 27, 1997
Charles E Nourrcier, Lakewood, CA (US);
Raytheon Company, El Segundo, CA (US);
Abstract
Safety discharge circuit and method, capable of protecting workers from electric shocks during maintenance of high voltage electrical systems. A high voltage electrical system is placed inside a grounded box having a cover, releasably connected to the box. The circuit uses an electronic device adapted to sense the removal of the cover from the box and disable the high voltage electrical system. The electronic device is connected to the cover at its input and to the high voltage electrical system at its output, and is preferably a semiconductor controlled rectifier having a gate at its input. The semiconductor controlled rectifier is in a reverse blocking state when the cover is connected to the box, and is latched in a forward conducting state when the cover is removed from the box. The connection from the gate of the semiconductor controlled rectifier to the cover is made through mounting screws, which hold the high voltage electrical system connected to the cover.