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. 30, 2013
Filed:
Mar. 28, 2011
Ta-yung Yang, Milpitas, CA (US);
LI Lin, Taipei, TW;
Chih-hsien Hsieh, Changhua County, TW;
Chuh-ching LI, Taoyuan County, TW;
Chi-yin Lo, Kaohsiung County, TW;
Kuo-hsiem Huang, Taipei County, TW;
Ta-Yung Yang, Milpitas, CA (US);
Li Lin, Taipei, TW;
Chih-Hsien Hsieh, Changhua County, TW;
Chuh-Ching Li, Taoyuan County, TW;
Chi-Yin Lo, Kaohsiung County, TW;
Kuo-Hsiem Huang, Taipei County, TW;
System General Corp., Taipei Hsien, TW;
Abstract
A control circuit of a LED driver according to the present invention comprises an output circuit, an input circuit and an input-voltage detection circuit. The output circuit generates a switching signal to produce an output current for driving at least one LED in response to a feedback signal. The switching signal is coupled to switch a transformer. The input circuit samples an input signal for generating the feedback signal. The input signal is correlated to the output current of the LED driver. The input-voltage detection circuit generates an input-voltage signal in response to an input voltage of the LED driver. The input circuit will not sample the input signal when the input-voltage signal is lower than a threshold. The control circuit can eliminate the need of the input capacitor for improving the reliability of the LED driver.