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. 09, 2004
Filed:
Sep. 25, 2002
Yutaka Ishihara, Tokyo, JP;
Kazuo Okawa, Suwa, JP;
Other;
Abstract
A discharge lamp lighting apparatus which can prevent an increase of loss and a rise of temperature in the area where discharge lamp tube voltage is low. A power conversion circuit converts the input power Pin to output the DC power Pd. A discharge lamp driving circuit converts the DC power Pd supplied from the power conversion circuit to output AC voltage Vo and AC current Io. A controller provides constant power control for maintaining the AC power Po provided by the AC voltage Vo and AC current Io to be constant when the AC voltage Vo is higher than the predetermined value V , and provides power reduction control for reducing AC power Po to the power conversion circuit when the AC voltage Vo is lower than the predetermined value V