Improved control strategy on buck-type converter with power factor correction scheme

A buck-type high power factor PWM active power converter topology is not only sufficiently capable of the effective elimination of input current harmonics, but its characteristics also include high efficiency, absence of inrush current, the capability to obtain low DC output voltage, ability to protect against short-circuits, etc. Buck-type high power factor power converters have the inherent capability to become attractive power supplies for telecommunications energy systems. On the other hand, because this type of power converter must employ high-inductance readers, these tend to increase equipment size and weight, and this has prevented their widespread use. This paper presents a new control strategy for buck-type high power factor PWM power converters which can reduce the size and weight of reactor and also eliminate the ripple component included in their output voltage. The operating principles and simulation results are also described.