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. 31, 1985
Filed:
May. 10, 1984
John Chen, Taichung, TW;
Chin Huang, Taoyuan, TW;
Nancy D Graves, Indianapolis, IN (US);
James E Hicks, New Palestine, IN (US);
RCA Corporation, Princeton, NJ (US);
Abstract
A protection circuit for a video display apparatus causes shutdown to occur at substantially the same high voltage level for all fault conditions. The video display apparatus incorporates an SCR regulator and a high voltage transformer tuned to the third harmonic. To counter the effect of shutdown to occur at a higher voltage level for a shorted SCR fault than for other faults, the SCR anode control pulse is processed to provide a signal having different voltage levels for normal SCR operation and shorted SCR operation. The voltage level which occurs during a shorted SCR condition is selected to cause shutdown of the video display apparatus at substantially the same high voltage level as that for other fault conditions.