Design and fabrication of an interleaved high step‐up DC–DC converter with soft‐switching capability to implement in renewable energy systems

Abstract

This paper presents a soft‐switching non‐isolated interleaved high step‐up topology to implement in renewable energy systems. By using low number of power electronic devices and incorporation with the coupled inductors (CIs) and built‐in transformer (BIT), simultaneously, mixed with a voltage multiplier cell (VMC), an ultra‐large gain can be obtained. In addition, the interlevead structure in the input side causes to diminish the input current ripple. Moreover, the automatic current sharing is another characteristic of the proposed converter. The voltage stresses across power semiconductors are decreased by increasing the turns ratio of the implemented CIs and BIT and also reverse recovery losses are attenuated which improves the efficiency. Furthermore, zero‐current‐switching (ZCS) condition for diodes is achieved at turn off instant, due to the leakage inductances of the magnetic means. Also, power MOSFETs are switched with zero‐voltage‐switching (ZVS) performance by adding active clamp. A 600‐W experimental prototype with 24‐V input to 400‐V output voltage at a switching frequency of 100 kHz is built and tested to examine the merits of the proposed topology