Abstract
A high Step-Up Quadratic Boost Flyback Converter is presented in this work. This converter is designing by combining A boost converter and a flyback converter in stacked
connection, the voltage gain can be adjusted by varying the turn ratio of the coupled
inductor. A two components resonant cell is used to achieve Zero Voltage Switching at turn
ON and turn OFF switching and to maintain Zero Current Switching on semiconductor
diodes. To prevent reverse resonant inductor current flowing back to the source, an input
boost cell is used, which allows not only to make higher the voltage gain but also to make
better the efficiency. The prototype works with a conversion rate of over ten times of the
input voltage and the efficiency is over 88% when using a 200W PV module.