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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.:

US 8847511 B1

PDFFull Text
Date of Patent:
Sep. 30, 2014

Filed:

Sep. 04, 2013

Light emitting diode driving circuit

Applicant:

I-shou University, Kaohsiung, TW;

Inventors:

Hung-Liang Cheng, Kaohsiung, TW;

Chao-Shun Chen, Kaohsiung, TW;

Assignee:

I-Shou University, Kaosiung, TW;

Attorney:

Jianq Chyun IP Office

Primary Examiner:

Douglas W Owens

Assistant Examiner:

Dedei K Hammond

Int. Cl.
CPC ...
G05F 1/00 (2006.01); H05B 37/00 (2006.01); H05B 37/02 (2006.01); H05B 39/00 (2006.01); H05B 39/02 (2006.01); H05B 39/04 (2006.01); H05B 41/14 (2006.01); H05B 41/16 (2006.01); H05B 41/24 (2006.01); H05B 41/36 (2006.01); H05B 33/08 (2006.01);
U.S. Cl.
CPC ...
H05B 33/0815 (2013.01);
Abstract

A light emitting diode (LED) driving circuit suitable for driving an LED load is provided. The LED driving circuit includes an AC voltage source, a bridge rectifier, a plurality of diodes, inductors, transistors and capacitors. The diodes, inductors, transistors and capacitors are configured to form a buck-boost converter and a buck converter, where the buck-boost converter and the buck converter share the transistors as active switches. Designer can design the LED driving circuit with zero-voltage switching-on using the diode characteristic of the existing active switches by selecting suitable circuit parameters.

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