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:
Jun. 01, 2004
Filed:
Nov. 08, 2001
Hiroyasu Kisaichi, Tokyo, JP;
Masatomi Asayama, Yokohama, JP;
Other;
Abstract
The discharge lamp lighting apparatus has a step-up/step-down converter comprising a transformer , a first switching element serially connected to the transformer on a side of a commercial ac power source , and a first diode and a first capacitor connected to the transformer on the load side; zero-cross detection means for detecting the zero-cross of voltage of the commercial ac power source ; a supplemental power circuit comprising a second diode connected to the junction between the transformer and the first switching element , a second capacitor for charging electric power stored in the coil of the transformer on a side of the commercial ac power source via the second diode , and a second switching element , a third diode and an inductance through which the energy charged in the second capacitor is supplied to the discharge lamp ; and a control circuit that operates the second switching element in the supplemental power means based on the output from the voltage zero-cross detection means during a predetermined period of time around the zero-cross.