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:
Jul. 05, 2005
Filed:
Nov. 26, 2002
Tokushi Yamauchi, Hirakata, JP;
Tsutomu Shiomi, Kitakatsuragi-gun, JP;
Minoru Maehara, Matsubara, JP;
Yutaka Iwahori, Kadoma, JP;
Toshiaki Nakamura, Kadoma, JP;
Takeshi Kamoi, Woburn, MA (US);
Tokushi Yamauchi, Hirakata, JP;
Tsutomu Shiomi, Kitakatsuragi-gun, JP;
Minoru Maehara, Matsubara, JP;
Yutaka Iwahori, Kadoma, JP;
Toshiaki Nakamura, Kadoma, JP;
Takeshi Kamoi, Woburn, MA (US);
Matsushita Electric Works, Ltd., Kadoma, JP;
Abstract
An electronic ballast for a high intensity discharge lamp (HID) includes a power converters, a controller, and a lamp power switch. In the power converter, an input DC voltage is converted into a ballast output power for lighting the HID lamp. The controller has a function to control the power converter and change the ballast output power. The lamp power switch detects a lamp output parameter indicated after the HID lamp starts discharge, identifies a lamp power of the HID lamp according to the lamp output parameter, and gives an identification signal indicating the lamp power. In response to this identification signal, the power converter outputs the ballast output power which matches with the lamp power identified.