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:
Sep. 02, 2003
Filed:
Apr. 12, 2002
Sean Noone, County Mayo, IE;
Thomas Durkan, County Mayo, IE;
Michael Quinlan, County Limerick, IE;
Paul McCarthy, County Limerick, IE;
Noontek Limited, County Mayo, IE;
Abstract
A driver waveform ( ) for a gas discharge lamp is produced by a ballast circuit. The waveform ( ) has a substantially vertical rising portion ) forming an instantaneous, of time 10 &mgr;secs or so between T and T transition between currents −I and +I which are at a current value less than peak currents IP. Then in a transition rise at controlled slew rate the waveform ( ) rises with a straight rising portion ( ) to a steady peak current IP identified by the numeral ( ). The peak current IP is maintained between T and T which accounts for between 40% and 80% of the cycle time. Then at T decline occurs with waveform having a declining slew rate portion ( ) to time T when instantaneous transition between time T and T and currents +I to −I occurs. The driver waveform reduces the formation of high frequency harmonies and increases are stability.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile