Design Of High Performance CCM PFC Circuits

Power supplies connected to AC mains introduce harmonic currents in the utility. It is very well known that these harmonic currents cause several problems such as voltage distortion, heating, noises, and reduce the capability of the line to provide energy. This fact and the presence of Standards or Recommendations have forced the industry to use power factor correction (PFC) in power supplies.Recently, with the application widely of the LCD TV, desktop computers and the note computers, the studies on the PFC controllers that is high performance, high power, highly integrated, are paid much attention increasingly. The paper in detail introduces the design process of a high performance CCM PFC circuits and analysis the techniques and the advantages of the average current control mode. With regards to the disadvantages of high wastage and a slow transient response, the paper presents a design method about green mode and a proprietary multi-vector error amplifier that can provide a fast transient response in a low-bandwidth PFC loop. In order to enhance the integration and the noise immunity of PFC circuits, the paper adopt a novelty technology about switching-charge multiplier-divider.The analysis, the design and the optimization of the function block circuits are introduced in the paper. Further more, they are simulated by Hspice/Cadence in SINO high voltage model (1uM). The results indicate that the chip met with all the design specifications, and have a perfect Power Factor controlling performance.