A New Step-Down DC-DC Converter with Synchronous Rectifier and Soft Switching Conditions

Subject Areas : Renewable energy

Rohollah Khorammi ¹ , Majid Delshad ² , Hadi Saghafi ³

1 - Department of Electrical Engineering- Khorasgan Branch, Islamic Azad University, Khorasgan, Isfahan, Iran
2 - Department of Electrical Engineering- Khorasgan Branch, Islamic Azad University, Khorasgan, Isfahan, Iran
3 - Department of Electrical Engineering- Khorasgan Branch, Islamic Azad University, Khorasgan, Isfahan, Iran

Received: 2020-12-31 Accepted : 2021-03-09 Published : 2022-01-21

Keywords: Efficiency, High Step-up Converter, Low Voltage Stress, Synchronous Rectifier,

Abstract :

In this paper, a high step down converter with a synchronous rectifier is presented, so that both the main switch and the rectifier switch operate under soft switching condition. Since the proposed converter gain is much lower than the conventional buck converter, it does not have the problems of these converters such as narrow duty cycle, high voltage stress and high switch current, etc. In the proposed converter, the voltage stress on the switch is reduced, so a switch with lower drain-source resistance (RDS(ON)) can be used and the conduction losses are reduced. On the other hand, because the diodes of the circuit are switched off under zero current switching condition, do not have the problem of reverse recovery. Switching losses of the switches are also greatly reduced due to operating under zero voltage switching conditions. The proposed converter has been thoroughly analyzed and a practical 120 W prototype has been made to prove the correctness of the circuit analysis.

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