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:
Jul. 23, 1996
Filed:
Sep. 29, 1994
Everett S Stone, Santa Rosa, CA (US);
Hybrinetics, Inc., Santa Rosa, CA (US);
Abstract
A dimming control circuit for connection to a nondimming ballast in a fluorescent lighting system is disclosed herein. The control circuit is switchably connected to a source of AC voltage within the lighting system, while the ballast includes terminals for connecting to a fluorescent lamp. A power control module within the control circuit is operative to conduct a controllable portion of the voltage waveform provided by the source of AC voltage to the ballast in accordance with a brightness control signal received by a phase control circuit. A turn-on module, operatively coupled to the power control module, operates to shunt current from the phase control circuit during a turn-on interval commencing upon connection of the dimming control circuit to the source of AC voltage in order that substantially the entire voltage waveform is provided to the ballast during the turn-on interval.