PROJECT TITLE :

Highly Efficient Asymmetrical PWM Full-Bridge Converter for Renewable Energy Sources

ABSTRACT:

This paper presents a highly efficient asymmetrical pulse-width modulated (APWM) full-bridge converter for renewable energy sources. The proposed converter adopts full-bridge topology and uneven control scheme to attain the zero-voltage switching (ZVS) flip-on of the ability switches of the primary facet and to reduce the circulating current loss. Moreover, the resonant circuit composed of the leakage inductance of the transformer and therefore the blocking capacitor provides the zero-current switching (ZCS) turn-off for the output diode while not the assistance of any auxiliary circuits. So, the reverse recovery drawback of the output diode is eliminated. Yet, voltage stresses of the power switches are clamped to the input voltage. Due to these characteristics, the proposed converter has the structure to minimize power losses. It is particularly useful to the renewable energy conversion systems. To substantiate the theoretical analysis and validity of the proposed converter, a 400 W prototype is implemented with the input voltage vary from 40 to 80 V.