Single-switch three-level boost converter for PWM dimming LED lighting

01/2011; DOI: 10.1109/ECCE.2011.6064114

ABSTRACT In this paper, a novel single-switch three-level (TL) boost converter for PWM dimming LED lighting is presented. Taking the system efficiency and output ripple into consideration, traditional two-level boost LED driver always employs additional active switch in order to deal with the dimming issue. However, the proposed TL boost converter has overcome the dimming control problem with only one switch by utilizing the "synchronous" PWM dimming approah, hence lower the system cost. Moreover, compared with the standard TL boost converter, the proposed topology not only maintains the advantage of using a lower voltage rating power switch that is rated half the output voltage, but also eliminates one active switch and its associated driving circuit. The operating principle and dimming scheme of the proposed TL boost converter is described in detail. A prototype of 11-W dimmable LED driving converter has been implemented to verify the design and analysis. The experimental result shows that single-switch TL boost converter can regulate the LED current from zero to the rated 350mA with fast slew rate. A peak efficiency of 95% was achieved with 400kHz switching frequency.

  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: High-Brightness Light Emitting Diodes (HB-LEDs) are considered the future trend in lighting not only due to their high efficiency and high reliability, but also due to their other outstanding characteristics: chromatic variety, shock and vibration resistance, etc. Nevertheless, they need the development of new power supplies especially designed for boosting and taking advantage of their aforementioned characteristics. Besides, their behaviour is completely different from the rest of lighting devices and, consequently, it should be also taken into account in the design of the converters used to drive them. As a result, many well-known topologies have been optimized or redesigned in order to be used in LED lighting applications and many new topologies have come up in the recent years with the same purpose. In this paper, the main HB-LED characteristics will be explained, highlighting how they influence the design of their power supplies. After, the main topologies will be presented from the simplest to the most complex ones, analysing their advantages and disadvantages.
    05/2012; 53(2). DOI:10.7305/automatika.53-2.154
  • [Show abstract] [Hide abstract]
    ABSTRACT: The progress in light emitting diodes (LEDs), especially in producing ultraviolet light, leads to new applications in medical science and in the area of disinfection. Biological investigations show a greater effectiveness when the ultraviolet light is pulsed. Therefore, converters which enable a fast turn-on and turn-off of the light emitting diodes are necessary. Several concepts to improve the possibility to supply switched loads are shown, and the equations for linear and two-level control are derived from the model equations. Dimensioning hints are given.
    2014 International Conference on Optimization of Electrical and Electronic Equipment (OPTIM); 05/2014
  • [Show abstract] [Hide abstract]
    ABSTRACT: A special converter with limited duty cycle for driving LEDs is treated. The basic analysis is done resulting in dimensioning equations of the converter. A mathematical model based on state-space description is derived. Some experimental results are shown. The converter is useful for street, home, and automotive lightning applications.
    2014 ELEKTRO; 05/2014

Full-text (2 Sources)

Available from
Apr 5, 2015