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:
Mar. 08, 2005
Filed:
Mar. 05, 2003
Yiyoung Tony Sun, Beverly, MA (US);
Takeshi Goriki, Osaka, JP;
Hiroyasu Eriguchi, Lexington, MA (US);
Yiyoung Tony Sun, Beverly, MA (US);
Takeshi Goriki, Osaka, JP;
Hiroyasu Eriguchi, Lexington, MA (US);
Matsushita Electric Works, Ltd., Osaka, JP;
Abstract
Circuit and method for driving a gas discharge lamp having a bridge converter. The bridge converter includes a plurality of switches. A controller turns on and off the plurality of switches. The circuit further includes a zero current sensor circuit. The controller senses at least one voltage differential to control a length of time that at least one of the at least four switches is on. The controller controls when at least one of the plurality of switches is turned on in accordance with an output of the zero cross sensor.