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A Flyback Inverter Topology without Electrolytic Input Capacitors as Energy Storage Element Robert Baake In today's PV inverters, the high input capacitance, necessary for the energy storage during the slow 60Hz cycle is provided by bulky electrolytic capacitors. Liquid electrolyte stored in the capacitor is quickly evaporated due to above rating temperatures, leading to a rise in ESR (equivalent series resistance). The resulting elevated heat dissipation reduces efficiency and accelerates degradation, possibly leading to eventual failure of the inverter. The challenge is to replace these electrolytic capacitors with a different energy storage element. This thesis proposes a new inverter using a Flyback transformer to eliminate the use of electrolytic capacitors as energy storage. A 35W inverter prototype was designed and built to demonstrate the operation of the proposed inverter. Results show that the inverter is able to provide a square-wave AC output, without large electrolytic input capacitance, while meeting several design specifications. ACKNOWLEDGMENTS First and foremost I would like to thank my family, my mother Vivienne Scharberth, my brother Christopher Baake, my sister Jennifer Dixon and my great-aunt Margarita Dreyer for their nourishment throughout the last years. In addition I would like to express my gratitude to Dr. Taufik for his support. The time and knowledge he provided has made this thesis an outstanding experience of the highest quality. His thoughtful insight during the entire process helped me fulfill the objective at hand. By challenging me throughout, I am looking forward to working and using my skills. I would also like to thank my committee chairs Dr. Dolan and Dr. Prodanov for their time and interest in my thesis. Furthermore, I would like to thank my friends who have made these years valuable and memorable. I have found trust and reliability, since in stressful times and challenging environments true personality is invariably revealed.

A FLYBACK INVERTER TOPOLOGY WITHOUT ELECTROLYTIC INPUT CAPACITORS AS ENERGY STORAGE ELEMENT