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:
Nov. 19, 2012
Filed:
Aug. 25, 2009
Robert L. Lyle, Jr., Raleigh, NC (US);
Steven P. Laur, Raleigh, NC (US);
Zaki Moussaoui, Palm Bay, FL (US);
Robert L. Lyle, Jr., Raleigh, NC (US);
Steven P. Laur, Raleigh, NC (US);
Zaki Moussaoui, Palm Bay, FL (US);
Intersil Americas Inc., Milpitas, CA (US);
Abstract
A double-ended, DC-AC converter supplies AC power to a load, such as a cold cathode fluorescent lamp used to back-light a liquid crystal display. First and second converter stages generate respective first and second sinusoidal voltages having the same frequency and amplitude, but having a controlled phase difference therebetween. By employing a voltage controlled delay circuit to control the phase difference between the first and second sinusoidal voltages, the converter is able to vary the amplitude of the composite voltage differential produced across the opposite ends of the load. The converter may be either voltage fed or current fed.