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:
Oct. 25, 2011
Filed:
Dec. 10, 2008
Yen-hui Wang, Hsin-Chu, TW;
Chin-yen Lin, Hsin-Chu, TW;
Chia-chieh Hung, Hsin-Chu, TW;
Yu-min Shih, Hsin-Chu, TW;
Yen-Hui Wang, Hsin-Chu, TW;
Chin-Yen Lin, Hsin-Chu, TW;
Chia-Chieh Hung, Hsin-Chu, TW;
Yu-Min Shih, Hsin-Chu, TW;
Grenergy Opto., Inc., Hsin-Chu, TW;
Abstract
This patent discloses an efficient PWM controller for generating a pulse signal in response to a feedback signal, capable of operating in a normal mode or a green mode, comprising: a capacitor for building a saw-tooth signal by current integration, the saw-tooth signal having a ramp-up period and a ramp-down period; a first composite current source for the ramp-up period, detachable into a first constant current source and a first variable current source; and a second composite current source for the ramp-down period, detachable into a second constant current source and a second variable current source; wherein, the first variable current source is attached to the first constant current source and the second variable current source is attached to the second constant current source respectively in the green mode.