Bridgeless PFC-Modified SEPIC Rectifier with Extended Gain for Universal Input Voltage Applications
The proposed topology is designed to operate in discontinuous conduction mode (DCM) to achieve almost a unity power factor and low total harmonic distortion (THD) of the input current. The DCM operation gives additional advantages such as zero-current turn-on in the power switches and simple control circuitry. The proposed topology is compared with modified full-bridge SEPIC rectifier in terms of efficiency, THD, and power factor.
The DCM operation requires a high-quality boost inductor since it must switch extremely high peak ripple currents and voltages. As a result, a more robust input filter must be employed to suppress the high-frequency components of the pulsating input current, which increases the overall weight and cost of the rectifier. In addition, several PFC topologies based on flyback, buck-boost, and Cuk converters have been published. However, these topologies have an inverting output.
In this paper, a new single-phase ac–dc PFC bridgeless rectifier with extended gain range operating in DCM is introduced. The DCM operation results in soft turn-on switching and relatively low inrush current. The voltage gain can be extended without extreme duty cycle operation which makes the proposed topology suitable for universal line voltage applications.
The proposed bridgeless rectifier with coupled magnetic configurations results in higher overall efficiency and higher power density.
TOOLS AND SOFTWARE USED:
- MP LAB
Ahmed M. Al Gabri, Student Member, IEEE, Abbas A. Fardoun, Senior Member, IEEE, and Esam H. Ismail, Senior Member, IEEE, “Bridgeless PFC-Modified SEPIC Rectifier With Extended Gain for Universal Input Voltage Applications”, IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 30, NO. 8, AUGUST 2015