Design and Implementation of A LED Driver Circuit with Dimming Function without Burst Mode at Constant Switching Frequency
LIGHT AND ENGINEERING, vol.31, no.6, pp.58-63, 2023 (SCI-Expanded)
- Publication Type: Article / Article
- Volume: 31 Issue: 6
- Publication Date: 2023
- Doi Number: 10.33383/2023-008
- Journal Name: LIGHT AND ENGINEERING
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED)
- Page Numbers: pp.58-63
- Akdeniz University Affiliated: Yes
Abstract
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.