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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 11233449 B1

PDFFull Text
Date of Patent:
Jan. 25, 2022

Filed:

Feb. 27, 2018

Tapped single-stage buck converter led driver

Applicant:

Lumileds Llc, San Jose, CA (US);

Inventors:

Zhi Hua Song, San Jose, CA (US);

Wouter Soer, San Jose, CA (US);

Assignee:

Lumileds LLC, San Jose, CA (US);

Attorney:

Volpe Koenig

Primary Examiner:

Anh Q Tran

Int. Cl.
CPC ...
H02M 7/06 (2006.01); H02M 3/156 (2006.01); H02M 1/08 (2006.01); H02M 1/24 (2006.01); H05B 45/48 (2020.01); H02M 1/12 (2006.01); H05B 45/375 (2020.01); H03K 5/24 (2006.01); H02M 1/44 (2007.01); H05B 45/355 (2020.01); H05B 45/36 (2020.01); H02M 1/00 (2006.01); H02M 1/42 (2007.01);
U.S. Cl.
CPC ...
H02M 1/12 (2013.01); H02M 1/08 (2013.01); H02M 7/06 (2013.01); H05B 45/375 (2020.01); H02M 1/0048 (2021.05); H02M 1/4291 (2021.05); H02M 1/44 (2013.01); H03K 5/24 (2013.01); H05B 45/355 (2020.01); H05B 45/36 (2020.01);
Abstract

An apparatus is disclosed, comprising: a first light source having a first threshold voltage; a second light source having a second threshold voltage; a rectifier configured to receive an AC voltage as input and generate a DC voltage based on the AC voltage; a single-stage Buck converter section coupled to the rectifier, the first light source, and the second light source, the Buck converter section being configured to output a current generated based on the DC voltage towards the first light source and the second light source; and a switching circuit configured to reduce a load on the Buck converter section by periodically diverting the current away from the second light source when a magnitude of the AC voltage is less than or equal to a sum of the first threshold voltage and the second threshold voltage.

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