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:
Mar. 18, 1980
Filed:
Sep. 02, 1977
Richard S Loucks, Northridge, CA (US);
International Telephone and Telegraph Corporation, New York, NY (US);
Abstract
A high efficiency regulated heater power supply which avoids the interactive effects of varying magnetic field around the heater on tube operating parameters. The technique employed is to 'chop' the low frequency (typically, 60 Hz) supply at a high frequency 10 kHz, for example, rate. Regulation is accomplished by sensing RMS voltage across the heater (filament) and adjusting the 'chopping' duty cycle to maintain constant RMS heater voltage. The aforementioned magnetic field effects are prevented by synchronizing the 'chopping' frequency with the tube pulse rate, such that the tube heater (filament) is actually deenergized and operating on thermal inertia only during tube pulsed operation.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile