Abstract: A new high efficiency multifunctional Buck/Boost/Buckboost-PFC rectifier is presented in this paper. First the three operating modes of the rectifier and the commutation states of the three PFC modes are illustrated. Then the design of the controllers are discussed and so is how the controller output are allocated for switches according to the input sinusoidal voltage. For the converter, there are only two high frequency switching actions in each sample period and only one inductor is used. So system efficiency can be improved. Experiments are conducted to verify the effectiveness of the PFC rectifier at last.