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:
Apr. 06, 2010
Filed:
Aug. 31, 2004
Katsuyoshi Nakada, Katano, JP;
Hirofumi Konishi, Hirakata, JP;
Junichi Hasegawa, Neyagawa, JP;
Koji Watanabe, Kadoma, JP;
Kiyoaki Uchihashi, Kobe, JP;
Toshiaki Sasaki, Hirakata, JP;
Katsuyoshi Nakada, Katano, JP;
Hirofumi Konishi, Hirakata, JP;
Junichi Hasegawa, Neyagawa, JP;
Koji Watanabe, Kadoma, JP;
Kiyoaki Uchihashi, Kobe, JP;
Toshiaki Sasaki, Hirakata, JP;
Panasonic Electric Works Co., Ltd., Kadoma-shi, JP;
Abstract
A discharge lamp ballast having a starting circuit including a second inductor connected between a first end of a discharge lamp and the positive voltage side of a first capacitor; a second capacitor forming a resonance circuit together with the second inductor; a second switching element connected between the positive terminal of a DC power source and the second end of the lamp; a third switching element connected between the second end of the lamp and the negative voltage side of the first capacitor; and a starting controller that controls both switching elements. The starting controller alternately turns both switching elements on and off so as to contribute resonance voltage of the resonance circuit for starting of the lamp in case of the starting mode.