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:
Feb. 14, 2012
Filed:
Aug. 18, 2009
Marijan Kostrun, Tolland, CT (US);
Helmar Adler, Danvers, MA (US);
Marijan Kostrun, Tolland, CT (US);
Helmar Adler, Danvers, MA (US);
OSRAM SYLVANIA Inc., Danvers, MA (US);
Abstract
There is provided herein a method for starting a high intensity discharge lamp and a ballast incorporating the same. In a preferred embodiment, the method comprises the steps of: (a) obtaining a cumulative probability function of breakdown times, P(t), for the lamp at a voltage, V; (b) determining a minimum pulse length, T, for a selected probability of ignition, P; (c) if the lamp is operable at the minimum pulse length, then operating the lamp with a DC pulse having a duration Tand voltage V; (d) or alternatively, if the lamp is not operable at the minimum pulse length, then determining a relaxation time, T, for a burst mode, selecting a probability of ignition per burst, P, calculating a minimum number of pulses, n, in a burst, determining a number of bursts, N, for the selected probability of ignition, and operating the lamp in the burst mode with Nbursts separated by relaxation time, T, with each burst having npulses of voltage V.