Analysis, Design, and Investigation of a Soft-Switched Buck Converter with High Efficiency

Iman Talebian, Peyman Alavi, Vafa Marzang, Ebrahim Babaei, Arash Khoshkbar Sadigh

Research output: Contribution to journalArticlepeer-review


In this paper, a new simple buck converter with zero voltage switching (ZVS) performance and almost zero output current ripple is proposed. This converter consists of a single switch which turns on and turns off with soft-switching condition. The proposed structure's auxiliary circuit contains a capacitor and an inductor without any switches which makes it possible to minimize the switching losses and eliminate other additional losses. Since the auxiliary inductor current is implemented to provide the expected soft-switching condition, the main inductor's current ripple which is the output current ripple remains almost zero. The main power diode also turns off under zero current switching (ZCS) condition and the reverse recovery losses of the power diode is minimized. The design section includes the designing criteria of the components. The comparison results are also discussed. Moreover, an experimental prototype of the proposed structure at 200W output power and 75kHz frequency is built to prove the mentioned advantages. Finally, the soft-switching waveforms are obtained for 100W and 200W output powers with various duty cycles and equal switching frequency to verify the ZVS performance of the converter at different loads and changes in input voltage and duty cycle.

Original languageEnglish (US)
JournalIEEE Transactions on Power Electronics
StateAccepted/In press - 2021

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

Cite this