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. 24, 2009
Filed:
Sep. 07, 2004
Koji Watanabe, Kadoma, JP;
Hirofumi Konishi, Hirakata, JP;
Junichi Hasegawa, Neyagawa, JP;
Katsuyoshi Nakada, Katano, JP;
Toshiaki Sasaki, Hirakata, JP;
Koji Watanabe, Kadoma, JP;
Hirofumi Konishi, Hirakata, JP;
Junichi Hasegawa, Neyagawa, JP;
Katsuyoshi Nakada, Katano, JP;
Toshiaki Sasaki, Hirakata, JP;
Panasonic Electric Works Co., Ltd., Osaka, JP;
Abstract
A DC-DC converterwith a switching element Qchanges a supply of power to a HID lamp DL. On/off of the element Qis controlled with a control circuit. The circuitcontrols an on/off state of the element Qwith constant lamp power control on stable operation of the lamp. The circuitcontrols the on/off state of the element Qso as to provide the lamp with lamp power larger than lamp power by the constant lamp power control based on high power control for a period of time that the lamp is on. It is possible to keep temperature of electrodes and within a bulb of the lamp in a proper state through simple control, and to prevent flicker generation and electrode degradation.