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:
Feb. 25, 2014
Filed:
Mar. 23, 2011
Yu-ping Chu, Hsin-Chu, TW;
Yu-Ping Chu, Hsin-Chu, TW;
Grenergy Opto Inc., Hsin-Chu, TW;
Abstract
A fixed-on-time controller utilizing an adaptive saw signal for discontinuous mode PFC power conversion, the fixed-on-time controller comprising: an error amplifier, having a negative input end coupled to a feedback signal, a positive input end coupled to a reference voltage, and an output end for providing a threshold signal; an adaptive current source generator, used to generate an adaptive current source according to the threshold signal; a capacitor, charged by the adaptive current source, being used for carrying a saw signal; a switch, used to discharge the capacitor under the control of a reset signal; and a comparator, having a negative input end coupled to the threshold signal, a positive input end coupled to the saw signal, and an output end for providing a turn-off signal; and a fixed-on-time driver circuit, used to provide a driving signal and the reset signal according to the turn-off signal and a sensing signal.