Improving dynamic response of power-factor preregulators by using two-input high-efficient postregulators

A new method to improve the dynamic response of power-factor preregulators (PFPs) is developed in this paper. The method is based on the use of a very high efficient postregulator with two inputs instead of only one. This two-input postregulator exhibits very high efficiency due to the fact that only a part of the total power undergoes a power conversion process. Such postregulators need two-output PFPs at their inputs, which can be easily obtained in PFPs with transformers or with two PFPs working in parallel.