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:
Jun. 04, 2013
Filed:
Jul. 29, 2011
Pei-cheng Huang, Taipei, TW;
Kuo-chi Liu, Hsinchu, TW;
Ming-hsueh Lee, Kaohsiung, TW;
Shih-hua Chien, Zhubei, TW;
Chao-hua Wu, NewTaipei, TW;
Pei-Cheng Huang, Taipei, TW;
Kuo-Chi Liu, Hsinchu, TW;
Ming-Hsueh Lee, Kaohsiung, TW;
Shih-Hua Chien, Zhubei, TW;
Chao-Hua Wu, NewTaipei, TW;
Richtek Technology Corporation, Hsin-Chu, TW;
Abstract
The present invention discloses a light emitting device open/short detection circuit, which is used for detecting at least one light emitting device string open/short. Each light emitting device string has a first end and a second end, wherein the first end is coupled to a voltage supply circuit to supply electrical power to the light emitting devices. The open/short detection circuit includes: an abnormal voltage detection circuit coupled to the light emitting device strings for receiving voltages of the second ends respectively and generating an abnormal voltage detection signal; a voltage setting circuit coupled to the abnormal voltage detection circuit for setting an abnormal reference level; and a determination circuit coupled to the voltage setting circuit. When the abnormal voltage detection signal is equal to or over the abnormal reference level, the determination circuit generates an open/short detection signal for an abnormal condition detected.