Three State Switching cell (3SSC) For PFC Applications

Nowadays, ac/dc converters are widely used in many offline power supplies such as adjustable-speed drives, switch-mode power supplies, uninterrupted power supplies (UPSs), and battery energy storage. An ac/dc converter consists of a diode-bridge rectifier, followed by a bulky capacitor and a high frequency dc/dc converter inevitably introduces a highly distorted input current, resulting in a large amount of harmonics and a low power factor (PF).

Reduction of harmonic content with the consequent increase of PF can be obtained by using Power Factor Correction (PFC) techniques. The closed-loop operation of a static power converter dedicated to PFC assures satisfactory performance with high input PF and regulated dc output voltage over a wide operating range. Improving power factor is very much essential for the better and economical performance of the system

The objective of this paper is introduces a topological variation of the boost converter based on the three state switching cell (3SSC) for PFC applications. This converter suitable for high-current and high-power applications. Moreover, the following advantages can be addressed to the use of the three-state cell: Inductors are designed for twice the switching frequency, with consequent reduction of size and weight; the current through the switches is half of the input current; part of the input power is delivered to the load by the transformer instead of the main switches, consequently reducing conduction and commutation losses; and the presence of the diode bridge is eliminated. The converter operation in both Overlapping Mode and Non-Overlapping Mode is described, where the main characteristics of the topology are discussed.

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