US Patent 7239094 Electronic ballast with adaptive lamp preheat and ignition

Patent 7239094 was granted and assigned to Universal Lighting Technologies on July, 2007 by the United States Patent and Trademark Office.

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Is a

Patent

Patent attributes

Current Assignee

Universal Lighting Technologies

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

7239094

Date of Patent

July 3, 2007

Patent Application Number

11004646

Date Filed

December 3, 2004

Patent Primary Examiner

‌

David Vu

Patent abstract

An electronic ballast includes a microcontroller with software to provide an adaptive lamp preheat and ignition operation. The microcontroller commands a test frequency from the inverter and detects the frequency response of the resonant output circuit by measuring the voltage across the resonant capacitor. The measured voltages are compared to one or more reference voltages as the frequency is varied to select the optimal inverter frequency. An algorithm or look-up table is used to set the inverter frequencies for the lamp preheat and ignition phases.