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Full-Bridge Single-Stage PFC with Reduced DC Bus Capacitor and Improved Light Load Operation as a Solution for Modern SMPS

Ribeiro, H.R. ; Borges, B. ; Ferreira, C.

Full-Bridge Single-Stage PFC with Reduced DC Bus Capacitor and Improved Light Load Operation as a Solution for Modern SMPS, Proc IEEE Energy Conversion Congress and Exposition - ECCE, Denver, United States, Vol. -, pp. 3413 - 3418, September, 2013.

Digital Object Identifier: 10.1109/ECCE.2013.6647149

Abstract
Modern Single-Stage Switch Mode Power Supplies
(namely Full-Bridge topologies for high power applications
>500W), allows to regulate the output voltage and the input
current, achieving a sinusoidal waveform by using only the
four bridge transistors. However, these solutions still need to
be optimized in order to become an interesting and attractive
solution for modern Switch Mode Power Supplies with PFC
function. One of the most important improvements needed is
the downsizing and the cost reduction associated to the DC bus
capacitor (CF - filtering capacitor). Nevertheless, this action
introduces several complex issues in the regulation of the input
current and also high output voltage ripple. The proposed
paper describes a new process to reduce the CF value solving
the identified issues. Firstly it is proved that it is possible to use
a reduced capacitance/watt ratio, lower than the one that is
typically used in commercial applications 0.5F/W, while
maintaining the accurate regulation of the input current. The
output voltage ripple issues are solved using a modified One
Cycle Control, OCC circuit. The concepts and solutions
developed will be proved based on experimental results in an
optimized FBSS topology that uses a Free Wheeling Capacitor,
FWC, circuit in order to improve the low power operation.