A New High Step-Up DC/DC Converter Structure by Using Coupled Inductor with Reduced Switch-Voltage Stress

Abstract

In this paper, a new high step-up DC/DC converter for renewable energy systems is proposed, which provides high voltage gain by using a coupled inductor without having to have high-duty cycle and high-turn ratio. Moreover, the voltage gain increased by using capacitors charging techniques. In the proposed converter, the energy of leakage inductors of the coupled inductor is recycled to the load. This feature not only reduces stress on main switch but also increases the converter efficiency. Also, due to the configuration of the proposed structure, the voltage stress on the main switch is significantly reduced. Since the stress is low in this topology, low voltage switch with small ON-state resistance value can be used to reduce the conduction losses. As a result, losses decrease and the efficiency increases. Meanwhile, the main switch is placed in series with the source and it can control the flow of energy from source to load. The operating principles and steady-state analysis of the proposed converter are discussed in details. Finally, the prototype circuit with 12 V input voltage, 300 V output voltage, and 60 W output power is operated to verify its performance.

Keywords::

• coupled inductor
• high step-up DC–DC converter
• low voltage stress
• renewable energy systems

Additional information

Notes on contributors

Majid Moradzadeh

Majid Moradzadeh was born in Ardabil, Iran, in 1989. He received his B.Sc. degree in Electrical Power Engineering from the Mashhad Institute of Technology (MIT), Mashhad, Iran, in 2011; and his M.Sc. degree from the University of Tabriz, Tabriz, Iran, in 2014. His current research interests include microgrids, design and control of dc-dc converters and multilevel inverters, and their applications in renewable energy systems.

Ebrahim Babaei

Ebrahim Babaei was born in Ahar, Iran, in 1970. He received the B.S. degree in Electronic Engineering and the M.S. degree in Electrical Engineering from University of Tabriz, Tabriz, Iran, in 1992 and 2001, respectively, graduating with first class honors. He received the Ph.D. degree in Electrical Engineering from University of Tabriz in 2007. In 2004, he joined the Faculty of Electrical and Computer Engineering, University of Tabriz where is currently a Professor. He is the author of more than 300 journal and conference papers. He also holds 17 patents in the area of power electronics. Professor Babaei has been the Editor-in-Chief of the Journal of Electrical Engineering of the University of Tabriz, since 2013. He is also currently an Associate Editor of the IEEE Transactions on IndustrialElectronics. He has been included in the Top One Percent of the World's Scientists and Academics according to Thomson Reuters' list in 2015. His current research interests include the analysis, modelling, design, and control of power electronic converters and their applications, renewable energy sources, and FACTS devices.

Elyas Zamiri

Elyas Zamiri received his B.Sc. degree in Electrical Engineering from University of Guilan, Rasht, Iran in 2012 and his M.Sc. degree from University of Tabriz, Tabriz, Iran in 2014. His major researches include investigation on new topologies of multilevel voltage source inverters, switched-capacitor dc-dc converters, photovoltaic grid-tied ac module and renewable energy systems.

Sajjad Hamkari

Sajjad Hamkari was born in Khoy, Iran, in 1990. He received his B.Sc. degree in Electrical Engineering from the University of Shahid Madani Azarbaijan, Tabriz, Iran, in 2012; and his M.Sc. degree from Tabriz University, Tabriz, Iran, in 2014. His current research interests include power electronics, charge controllers, power converters, multilevel inverters and renewable energy systems.