Improving dynamic response of power-factor correctors by using series-switching postregulator

A new method to improve the dynamic response of power-factor correctors (PF C's) is described in this paper. The method is based on the use of a new ve ry highly efficient postregulator, called a series-switching postregulator, This new postregulator exhibits very high efficiency due to the fact that only a part of the total power undergoes a power conversion process. The pr oposed postregulator can be used with any PFC topology (either with or with out a transformer), with no modifications in the topology, and can be easil y protected against short circuits.