A comparison of various buck-boost converters and their application to PFC

The conventional boost converters are generally used for rectifier circuits with power factor correction, and as a result the output voltage becomes limited. To expand the controlled voltage range, buck-boost or Cuk converter types should be utilized. This paper presents a circuit configuration with power factor correction by a third type of buck boost converter, termed a ´CSC, canonical switching cell´. Single-phase power factor correction using a buck boost converter can control the output voltage over a wide range, because it has the ability to step-up and step-down the output voltage. Firstly, this paper compares the mechanisms of the power transmission and the characteristics based on total stored energy. Secondly, CSC converter is applied to the single-phase power factor correction. It is presented that this converter is suitable for power factor correction.