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:
Apr. 19, 2010
Ta-yung Yang, Milpitas, CA (US);
Byung-hak Ahn, Seoul, KR;
Jin-hwa Chung, Seoul, KR;
Chun-chi Chen, Taipei County, TW;
Ta-Yung Yang, Milpitas, CA (US);
Byung-Hak Ahn, Seoul, KR;
Jin-Hwa Chung, Seoul, KR;
Chun-Chi Chen, Taipei County, TW;
System General Corp., New Taipei, TW;
Abstract
The present invention provides a control circuit for LED driver. A voltage-feedback circuit is coupled to LEDs to sense a voltage-feedback signal for generating a voltage loop signal. Current sources are coupled to the LEDs to control LED currents. A detection circuit is connected to sense voltages of current sources for generating a current-source loop signal in response to a minimum voltage of the current sources. Furthermore, a buffer circuit generates a feedback signal in accordance with the voltage loop signal and the current-source loop signal. The feedback signal is coupled to limit a maximum voltage of the LEDs and regulate the minimum voltage across the current sources.