A New Single-Switch ZCS Flyback-Forward Converter with High Power Density

Abstract

In this paper, a new zero current switching flyback-forward DC-DC converter is proposed. In the proposed converter to provide soft switching condition, an auxiliary circuit without any additional switch is used, which increases the efficiency. In this converter the switch is gated with PWM signal; therefore, the design and implementation of the control circuit is simple. The other advantages of the proposed converter are elimination of the core reset circuit and power transfer to the output in turn on and turn off switch that cause to increase power density. The experimental results verified the theoretical analysis and the efficiency of the proposed converter in full load is about 93%.

KEYWORDS:

• Flyback-forward converter
• Pulse width modulation
• Soft switching
• Zero current switching
• Zero voltage switching

Additional information

Funding

This work was supported by Islamic Azad University.

Notes on contributors

Shahrzad Jahangiri

Shahrzad Jahangiri was born in Masjed Soleyman, Iran, in 1989. She received the BS and MS degrees in electrical engineering in 2013 and 2015 from Mahshahr University and Islamic Azad University, Isfahan branch, respectively. Her research interest is DC-DC converters. E-mail: [email protected]

Majid Delshad

Majid Delshad was born in Isfahan, Iran, in 1979. He received the BS and MS degrees in electrical engineering in 2001 and 2004 from Kashan University and Isfahan University of Technology, Iran, respectively. He received the PhD degree also, in electrical engineering in Isfahan University of Technology. He is an associate professor in Islamic Azad University, Khorasgan Branch. His research interest includes soft switching techniques in DC-DC converters and current-fed converters.

Mahmood Vesali

Mahmood Vesali was born in Isfahan, Iran, in 1987. He received the BS and MS degrees in electrical engineering in 2008 and 2015, from Sepahan University and Islamic Azad University, Khorasgan Branch, respectively.His research interests are bidirectional DC-DC converters and soft switching DC-DC converters. E-mail: [email protected]