A soft‐switching inverting high step‐down converter with a pair of coupled inductors and self‐driven synchronous rectifier

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.

Novel synchronous rectification strategy for flyback converter in both DCM and CCM applications

“…The approaches proposed in refs. [13,15,16,21] can only work in DCM or CCM, and the approach proposed in this paper can apply in both DCM and CCM, which widens the application range. The approach proposed in ref.…”

“…In addition, the computing progress expends a significant amount of computing resources. The resonant self-driven scheme is proposed in [16]. The method used coupled inductor to generate the driving signal.…”

Very high step‐down coupled inductor two‐phase buck converter with single magnetic element and inherent clamp voltage capability

“…This feature leads to higher switching losses at the turn-off instant and the current ripple of the inductor increases. Moreover, creating this narrow duty cycle is difficult for control circuits [9].…”