Utilizing the free running current programmed control as a power factor correction technique for the two switch buck-boost converter

This paper presents a new power factor correction technique based on the free running current programmed control (FRCPC) technique. The FRCPC technique is adapted to the two switch cascaded buck-boost converter which provides variable output voltage and it can be used for universal input voltage. The converter has two operating modes: boost and buck. Boost mode occurs when the output voltage is higher than the input voltage and buck mode occurs when the output voltage is lower than the input voltage. Peak current control is used in boost mode and valley current control is used in buck mode. This new control technique exhibits high quality input current and its based on a simple control structure.