Design and Implementation of A LED Driver Circuit with Dimming Function without Burst Mode at Constant Switching Frequency

Börekci S., Çetin Acar N., Özdem Ş., Kırçay A.

LIGHT AND ENGINEERING, cilt.31, sa.6, ss.58-63, 2023 (SCI-Expanded)

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 31 Sayı: 6
  • Basım Tarihi: 2023
  • Doi Numarası: 10.33383/2023-008
  • Dergi Adı: LIGHT AND ENGINEERING
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED)
  • Sayfa Sayıları: ss.58-63
  • Akdeniz Üniversitesi Adresli: Evet

Özet

This paper presents a dimmable LED driver with a topology of combination of series and parallel resonant converter. In dimming operation, a variable resonant inductor controlled by a PWM signal at a low frequency, while proving DC output current approaches, switching frequency variation or conventional PWM technique is not used. The proposed technique is performed on a load that consists of 40 one-watt power LEDs connected in series. Switching frequency of circuit is kept constant at 60 kHz. According to experiments results, LEDs can be dimmed to a desired power level linearly within the range of nominal power to very low power without being in burst mode unlike of the conventional PWM technique.