T-type Buck-Boost PFC Rectifier in Continuous Conduction Mode

Power factor correction (PFC) circuits are used for many electronic circuits fed from the electrical grid. Today, the most common PFC circuit is based on a Boost converter, which provides a voltage increasing at its output. Since many loads require a lower voltage than the grid voltage, the BOOST PFC compels an additional level of conversion between the PFC and the load. This paper proposes an innovative topology of a PFC rectifier, a descendant of Buckboost topology, that supplies three levels of output voltage. The t-type Buckboost PFC rectifier (TBPR) is unique due to its ability to be step-down \ up the mains voltage in a single stage. The operation principles of the rectifier on continuous conduction mode (CCM) are presented, and the proposed theory is validated by simulations for closed-loop operation.