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:
Aug. 20, 2013
Filed:
May. 18, 2012
Min-woo Lee, Bucheon, KR;
Kyung-oun Jang, Bucheon, KR;
Sung-won Yun, Seoul, KR;
Dae-woong Cho, Seoul, KR;
Min-Woo Lee, Bucheon, KR;
Kyung-Oun Jang, Bucheon, KR;
Sung-Won Yun, Seoul, KR;
Dae-Woong Cho, Seoul, KR;
Fairchild Korea Semiconductor Ltd., Bucheon, KR;
Abstract
The present invention relates to a power supply device generating an output power by using an AC line voltage generated through rectification of an AC input, and a driving method thereof. The power supply device controls the switching operation of the power switch by using a sensing voltage corresponding to the drain current flowing to the power switch and the feedback voltage corresponding to the output voltage. The power supply device controls the feedback current every switching cycle to generate a threshold voltage, and compares the sensing voltage and the threshold voltage to control the turn-off of the power switch. The feedback current includes the first current to generate the feedback voltage, and the threshold voltage follows a curved line waveform in which the increasing slope is decreased during the switching cycle.