Due to the increase of energy cost and since light sources are vastly used, researchers are trying to replace old lighting equipment’s with new high efficiency sources. Today, due to the characteristics of LEDs, these semiconductor elements are considered as an efficient light source. According to the behavioral characteristics of LEDs, an interface circuit is needed to drive theses semiconductor devices with almost constant current. For this purpose, the linear or switching converters are used. Since Switching converters have higher efficiency than linear converters, especially in medium and high power applications, these converters are used to drive LED. The use of power electronics is growing rapidly as the LED driver circuit and input power factor correction is inevitable. Therefore, power factor correction converters with simple structure and control circuit are considered LED drive purposes. In discontinuous current mode or discontinuous voltage mode, switching converters have inherent power correction characteristics. In discontinues voltage mode (DVM), usually current stress of semiconductor devices are lower which results in lower conduction losses. DVM and DCM converters for LED driver are reviewed in this thesis. Also, a new DVM converter is introduced for LED drive purposes. Due to inherent power factor correction characteristics, high power factor is achieved. Also, all semiconductor devices are soft switched. The proposed converter is analyzed and design considerations are discussed. A prototype converter is implemented and experimental results are presented. Keywords: LED Driver, Power Factor Correction, DC-DC converter, AC-DC converter.
