A Non-Isolated DC-DC Converter with Dual Working Modes and Positive Output Voltage

Abstract

In this paper, a positive output DC/DC converter with low total switching device power in dual working modes is introduced. One working mode is a step-up mode (boost), and other is a step-up/down mode (buck-boost). The proposed converter in step-up mode has high voltage gain ratio, low stress on switches, and continuous input current. In other working mode, the buck-boost converter with six relevant DC/DC converters is compared. By this comparison, it can be seen that the proposed converter has a lower voltage gain ratio, but instead the converter characteristics such as voltage stress on power switches and charge pump capacitors are in good condition for this mode. The proposed converter is analyzed in terms of the continuous conduction mode (CCM), steady state and efficiency with replacement of parasitic resistance effects. To validate the performance of the proposed converter experiments are conducted in the laboratory to claim the theoretical waveforms obtained from the PLECS simulation.

Keywords:

• DC/DC converter
• continuous input current
• step-up/down mode
• buck-boost converter
• parasitic parameters
• dual working modes
• switching device power (SDP)
• PV application
• positive output
• common ground

Additional information

Notes on contributors

Mustafa Okati

Mustafa Okati received the M.Sc. degree in 2010 from the Department of Electrical Engineering, Islamic Azad University, Gonabad, Iran, and the Ph.D. degree in electrical engineering from the Department of Electrical Engineering, Islamic Azad University, Kerman, Iran, in 2021. His main research interest is the application of power electronic technology, DC/DC converter, PV inverters in power systems.

Mahdiyeh Eslami

Mahdiyeh Eslami received her B.Sc. degree from Shahid Bahonar University of Kerman, Iran, in 2000, the M.Sc. degree from Iran University of Science and Technology (IUST), Tehran, Iran, in 2004, and Ph.D. degree from National University of Malaysia (UKM) in 2012, all in Electrical Engineering. From 2012 to 2013, she was a Postdoctoral Research Fellow with the Power Research Group at UKM. She is currently an Assistant Professor with the Department of Electrical Engineering, Islamic Azad University of Kerman. Her research interests include power system stability, application of AI techniques in power systems, power system dynamics and FACTS devices.

Mehdi Jafari Shahbazzadeh

Mehdi Jafari Shahbazzadeh received the Ph.D. degrees from the Department of electrical Engineering, Shiraz University, Iran, in 2011. He is currently an Assistant Professor with the Department of Electrical Engineering, Islamic Azad University of Kerman. His current research interests include optimization, fault current limiters, power system transient.