Led spectral and power characteristics under hybrid PWM/AM dimming strategy

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Abstract

In order to dim LEDs the pulse width modulation (PWM) or amplitude modulation (AM) dimming scheme is typically used. Previous studies show that these dimming schemes can have opposite effects on diodes peak wavelength shift. An experimental study was conducted to test the behavior of InGaN diodes and phosphor-converted white diodes under hybrid PWM/AM modulation. Feed forward control schemes that provide stable peak wavelength position during dimming and the ability to compensate the thermally induced color shifts and the decrease of the luminous flux are investigated.

Original languageEnglish
Title of host publicationProceedings of the IEEE Energy Conversion Congress and Exposition, ECCE 2010
Number of pages5
PublisherIEEE Press
Publication dateSept 2010
Pages731-735
ISBN (Print)978-1-4244-5286-6
DOIs
Publication statusPublished - Sept 2010
EventIEEE Energy Conversion Congress and Exposition, ECCE 2010 - Atlanta, United States
Duration: 12 Sept 201016 Sept 2010

Conference

ConferenceIEEE Energy Conversion Congress and Exposition, ECCE 2010
Country/TerritoryUnited States
CityAtlanta
Period12/09/201016/09/2010

Keywords

  • Light-emitting diodes
  • Amplitude modulation
  • Pulse width modulation

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