Research On The Modeling Of Feedback Control In LED Driver Topologies

LED was driven by direct current. To transfer the commonly220V,50Hz AC electricity to DC which can drive the LED, a good LED driver was required. Whether the LED modules playing the best performance was directly related to the LED driver. Typically, the LED was powered by the DC getting by rectifier filter main supply, which inevitably mixed up many small signal AC fundamental waves, harmonic waves and so on. These small signals resulted in bad effects on the performance of LED. This paper maximized LED performance through the feedback control module, and simulation the result.Several common types of LED driver topologies was mainly studied. The feedback control effects on the performance of the LED driver module was also researched. Through practical circuit simulation and mathematical modeling, the two aspects did circuit analysis, and theoretical analysis. By comparing them, this subject’s consistency and accuracy modeling and simulation study of accords was verified.Firstly, the three common circuit system modeling methods which including basic modeling, drive components, respectively-average modeling were discussed. This article provide a detailed presentation of the three modeling process and characteristics. Focusing on the third method state-space averaging method, which provide the solid theoretical foundation for the three common types of topology modeling, refer to last three chapters of this article.Secondly, the3three common topologies Buck, Boost, Flyback topological was structured as examples. By Small-signal modeling the results of the three topological structures were analysed. After that, by using Saber software for circuit simulation, the simulation results was verified.Summarize all the above design, through the construction of Buck topology, the Boost topology based on L6562, Flyback topology based on UC3842to do modeling and simulation, the good work on circuit output in ripple frequency, power factor and output stability was demonstrated. And the validity of relevant theory verified.