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In this paper, a new synchronous rectified converter with ultra-low output current ripple and high voltage attenuation is proposed. The presented converter can achieve soft switching without requiring any additional active components, leading to high efficiency while maintaining the simplicity of conventional converters. Other main features of the proposed circuit are inherent shoot-through protection, reduced current stress of the semiconductors due to the coupled inductor, and low voltage stress across the low-side MOSFET. In addition, a pulse frequency modulation control scheme is used, which allows for an extended soft-switching range without imposing an excessive circulating current at light loads. The steady-state analysis and experimental results from a 120 W prototype are presented in this paper.

Abstract In this paper, a non‐isolated coupled‐inductor high step‐down converter with extended duty cycle is proposed, which operates under discontinuous conduction mode. The soft‐switching condition is provided for all the switches and diodes, which results in the reduction of the switching losses, and the losses related to diode reverse recovery problem. Also, a self‐drive circuit is used to automatically generate the ON and OFF gate signals of the synchronous rectifier, which recovers the gate energy and reduces the complexity. In this topology, only a single coupled inductor is proposed which decreases the size and cost of the proposed converter. A 200 W laboratory prototype is implemented, and its results confirm the validity of theoretical analysis and advantages of the proposed converter over previous structures.