LED dimming technique without frequency and pulse width modulations

BÖREKCİ S., Acar N. C., Kircay A.

INTERNATIONAL JOURNAL OF CIRCUIT THEORY AND APPLICATIONS, vol.46, no.11, pp.2028-2037, 2018 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 46 Issue: 11
  • Publication Date: 2018
  • Doi Number: 10.1002/cta.2523
  • Journal Name: INTERNATIONAL JOURNAL OF CIRCUIT THEORY AND APPLICATIONS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.2028-2037
  • Keywords: dimming, LED Driver, LLC, resonant circuits, DRIVER
  • Akdeniz University Affiliated: Yes

Abstract

In this paper, a novel dimmable light-emitting diode (LED) driver is implemented by a series-parallel resonant converter. Variable resonant inductor is used for dimming purposes. This technique is not requiring switching frequency variation or pulse width modulation, unlike commonly used techniques. The proposed technique is implemented on 40 one-watt series connected power LEDs at 60-kHz constant switching frequency. The experimental results show that LEDs can be dimmed to a desired power level within the range of nominal and low power.