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:
Oct. 24, 1995
Filed:
Feb. 25, 1994
Randy G Russell, Glen Ellyn, IL (US);
Peter W Shackle, Arlington Heights, IL (US);
Kent E Crouse, Hanover Park, IL (US);
Energy Savings, Inc., Schaumburg, IL (US);
Abstract
An electronic ballast includes a triggered boost circuit, a driven inverter, and a low voltage signal generator in a a half-bridge, push-pull, series resonant, parallel loaded configuration. The boost circuit is triggered by a voltage from the inverter and the inverter is controlled by the low voltage signal generator. The boost circuit includes a low voltage output for powering the signal generator. In the event of a fault, the operation of the signal generator is interrupted, thereby shutting off the boost circuit and the inverter. A DC blocking capacitor is in series with the lamps and a resistor is connected in parallel with the DC blocking capacitor. The ballast is started by a pulse of displacement current through the lamp filaments to the boost circuit. Since the lamp filaments must be intact, the ballast does not begin a lamp starting sequence until lamps are connected to the ballast.