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Title: Dimming LED circuit augmenting DC/DC controller integrated circuit

Abstract

Embodiments include systems, methods, and apparatuses for providing a dimming function in a single stage AC input light emitting diode (LED) driver with a controller that contains an on-chip error amplifier and an on-chip fixed reference voltage source coupled to a first input of the error amplifier. The controller controls a duty cycle of a switching transistor to cause a feedback voltage, applied to a first package input terminal, to match the reference voltage. To achieve a dimming function, a voltage across a current sense resistor in series with the LEDs is applied to a first input of a high gain differential amplifier, and a variable dimming control voltage is applied to a second input of the differential amplifier. The output of the differential amplifier is coupled to the first package input terminal. The differential amplifier input signals will be matched at the target LED current level.

Inventors:
; ; ;
Issue Date:
Research Org.:
Lumileds LLC, San Jose, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1805665
Patent Number(s):
10959306
Application Number:
15/606,388
Assignee:
Lumileds LLC (San Jose, CA)
DOE Contract Number:  
EE0006703
Resource Type:
Patent
Resource Relation:
Patent File Date: 05/26/2017
Country of Publication:
United States
Language:
English

Citation Formats

Song, Zhengrong, Soer, Wouter Anthon, Bonne, Ron, and Qiu, Yifeng. Dimming LED circuit augmenting DC/DC controller integrated circuit. United States: N. p., 2021. Web.
Song, Zhengrong, Soer, Wouter Anthon, Bonne, Ron, & Qiu, Yifeng. Dimming LED circuit augmenting DC/DC controller integrated circuit. United States.
Song, Zhengrong, Soer, Wouter Anthon, Bonne, Ron, and Qiu, Yifeng. Tue . "Dimming LED circuit augmenting DC/DC controller integrated circuit". United States. https://www.osti.gov/servlets/purl/1805665.
@article{osti_1805665,
title = {Dimming LED circuit augmenting DC/DC controller integrated circuit},
author = {Song, Zhengrong and Soer, Wouter Anthon and Bonne, Ron and Qiu, Yifeng},
abstractNote = {Embodiments include systems, methods, and apparatuses for providing a dimming function in a single stage AC input light emitting diode (LED) driver with a controller that contains an on-chip error amplifier and an on-chip fixed reference voltage source coupled to a first input of the error amplifier. The controller controls a duty cycle of a switching transistor to cause a feedback voltage, applied to a first package input terminal, to match the reference voltage. To achieve a dimming function, a voltage across a current sense resistor in series with the LEDs is applied to a first input of a high gain differential amplifier, and a variable dimming control voltage is applied to a second input of the differential amplifier. The output of the differential amplifier is coupled to the first package input terminal. The differential amplifier input signals will be matched at the target LED current level.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2021},
month = {3}
}

Works referenced in this record:

Error amplifier and LED circuit comprising the same
patent, October 2013


Boost converter with a pulse frequency modulation mode for operating above an audible frequency
patent, May 2016