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. 29, 2014
Filed:
Sep. 21, 2011
Sang Cheol Moon, Bucheon, KR;
Hyun Min Kim, Bucheon, KR;
Sung-won Yun, Seoul, KR;
Min-woo Lee, Bucheon, KR;
Sang Cheol Moon, Bucheon, KR;
Hyun Min Kim, Bucheon, KR;
Sung-Won Yun, Seoul, KR;
Min-Woo Lee, Bucheon, KR;
Fairchild Korea Semiconductor Ltd., Bucheon, KR;
Abstract
A power supply includes an input filter and a discharging device. The input filter includes a capacitor to which an AC power source is provided. The discharging device rectifies and samples the AC power source. The discharging device generates a reference voltage according to a peak voltage of a generated sampling signal, generates an AC power source cutoff detection signal according to a comparison signal generated by comparing the sampling signal and a reference voltage, and discharges the capacitor through a discharging resistor according to the AC power source cutoff detection signal.