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:
Feb. 19, 2019
Filed:
Apr. 23, 2015
The University of Hong Kong, Hong Kong, CN;
Yue Guo, Shenzhen, CN;
Ting Leung Albert Lee, Hong Kong, CN;
Sinan Li, Hong Kong, CN;
Siew Chong Tan, Hong Kong, CN;
Chi Kwan Lee, Hong Kong, CN;
Shu Yuen Hui, Hong Kong, CN;
VERSITECH LIMITED, Hong Kong, CN;
Abstract
A single-stage AC-DC single-inductor multiple-output (SIMO) LED driver uses a single inductor (L) to drive multiple independent LED strings (-) with Power Factor Correction (PFC). The driver uses a diode bridge () to achieve initial AC to DC conversion. The output of the bridge () is provided to a buck converter whose output is shared with multiple LED strings by a time division multiplex circuit. Feedback is used to separately control the current supplied to each LED string by using a separate reference for each string and controlling the width of the current pulse provided to a string. Current balancing in every LED string can be achieved with the same voltage reference without the need for additional circuitry.