Current sensorless solution for PFC boost converter operating both in DCM and CCM

In this paper a current sensorless solution for Power Factor Control (PFC) of an AC-DC boost converter operating in light load condition has been presented. A PI-based control with input voltage feedforward has been implemented in order to increase Power Factor (PF). A current observer, able to operate in either Continuous Conduction Mode (CCM) and in Discontinuous Conduction Mode (DCM), has been adopted in order to eliminate the need for expensive current sensors and to improve boost converter performances under light load conditions. The proposed solution has been numerically tested in three different load conditions using a powerful software simulation platform.