| With environmental contamination and energy source crisis are deteriorating continuously, more attention is given to green energy-efficient lighting. As the fourth generation light source, LED has the advantages of energy conservation, environmental protection and long life. It is of great significance to the mitigation of current environmental and energy issues by replacing traditional lighting with LED. At present, LED driver technology is also the focus of the study of power engineers.First, the LED characteristics and the development of the driver is described in the dissertation. Based on the description, a Two-stage topology is proposed. The first stage is PFC(Power Factor Correction) and the second stage is Quasi-Resonant Flyback.Second, the working principle and the characteristics in different modes of Boost is analyzed. And the control method of Boost in critical conduction mode is discussed.in detail. Based of the discussion, the design and parameter calculation of critical conduction mode Power Factor Correction converter is completed.In addition, the Quasi-Resonant Flyback converter is analyzed in the dissertation. First the typical flyback converter and the Quasi-Resonant Flyback converter are compared. A detailed analysis of the working process and the control method of Quasi-Resonant Flyback is presented. Based of the analysis, the design and parameter calculation of Quasi-Resonant Flyback is completed as well.Finally, combined with the relevant calculation parameters, a120W LED driver based on SSL4101is made. The related waveforms and parameters of the driver are given. The test results indicate that the driver can work well and achieve the constant output current, the power factor of the driver is more than0.9and the efficiency is about88%. The test results verify the feasibility of the proposed program. |
