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:
Aug. 29, 2006
Filed:
Dec. 03, 2004
Qinghong Yu, Salem, MA (US);
Christopher Radzinkski, Huntsville, AL (US);
Peter Shackle, Rolling Hills Estates, CA (US);
John Jay Dernovsek, Madison, AL (US);
Qinghong Yu, Salem, MA (US);
Christopher Radzinkski, Huntsville, AL (US);
Peter Shackle, Rolling Hills Estates, CA (US);
John Jay Dernovsek, Madison, AL (US);
Universal Lighting Technologies, Inc., Madison, AL (US);
Abstract
An electronic ballast has a resonant tank circuit that includes a tank inductor and a tank capacitor connected in series. Lossless sampling of the output voltage of the electronic ballast is achieved by monitoring the voltage across a sampling capacitor placed in series with the tank capacitor. A resistive and capacitive filter is used to filter the monitored voltage such that it can be accurately received by a microcontroller. A resistor is connected in series with the sampling capacitor to produce an open circuit output voltage control signal that is used by the microcontroller to limit the open circuit output voltage. A cable compensation circuit is utilized to minimize variations in the open circuit voltage due to the connecting and disconnecting of a cable to the ballast output terminals.