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. 27, 2006
Filed:
Feb. 28, 2005
Cheng-chia Hsu, Nantou, TW;
Yu-cheng Pan, Taipei, TW;
Chia-yuan Chen, Sindian, TW;
Jong-chi Tseng, Pingjhen, TW;
Teng-ho Wu, Yongkang, TW;
Cheng-Chia Hsu, Nantou, TW;
Yu-Cheng Pan, Taipei, TW;
Chia-Yuan Chen, Sindian, TW;
Jong-Chi Tseng, Pingjhen, TW;
Teng-Ho Wu, Yongkang, TW;
Logah Technology Corp., , TW;
Abstract
The invention discloses a feedback sampling control circuit for a lamp driving system having a feedback loop, in that the feedback sampling control circuit includes a switch and an effective current sampling controller. The switch is electrically coupled in the feedback path of the lamp driving system. The effective current sampling controller controls switching of the switch based on a voltage or current signal from a high voltage terminal of the lamp, such that an effective current actually sampled by a feedback controller in the lamp driving system is controlled so that a current component of a parasitic capacitance contained in the effective current is minimized. Thereby, the disadvantage caused by the leakage current through the parasitic capacitance can be eliminated and it is thus possible to precisely control the lamp current and to obtain a stable brightness quality.