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 12389507 B1

Date of Patent:

Aug. 12, 2025

Filed:

Sep. 08, 2023

Controller for controlling a light source module

Applicant:

O2micro Inc., Santa Clara, CA (US);

Inventors:

Naoyuki Fujita, Tokyo, JP;

Rong Hu, Beijing, CN;

Yung-Lin Lin, Palo Alto, CA;

Assignee:

O2Micro Inc., Santa Clara, CA (US);

Attorney:

Primary Examiner:

Tung X Le

Int. Cl.

CPC ...

H05B 45/34 (2020.01); H05B 45/325 (2020.01); H05B 45/345 (2020.01); H05B 45/375 (2020.01); H05B 45/38 (2020.01); H05B 45/46 (2020.01); H05B 45/52 (2020.01);

U.S. Cl.

CPC ...

H05B 45/46 (2020.01); H05B 45/325 (2020.01); H05B 45/34 (2020.01); H05B 45/345 (2020.01); H05B 45/375 (2020.01); H05B 45/38 (2020.01); H05B 45/52 (2020.01);

Abstract

A controller for controlling a light source module including a first LED string and a second LED string includes a power input terminal operable for receiving electric power from a boost converter, a power output terminal operable for providing electric power to the light source module through a buck converter, a first input terminal operable for receiving a first pulse width modulation (PWM) signal, a second input terminal operable for receiving a second PWM signal, and a width monitoring terminal operable for receiving a width monitoring signal indicating a duration of a first state of the first PWM signal and a duration of a first state of the second PWM signal. The controller is operable for turning off the light source module if the width monitoring signal is greater than a width threshold signal.

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