Novel Isolated High Step-up DC-DC Converter with Wide Input Voltage Regulation Range

Abstract

This paper proposes novel isolated current fed high step-up dc-dc converter. The proposed converter can be operated for wide input voltage range applications with high efficiency. The main affirmative point of the suggested converter is the high voltage conversion ratio feature with low voltage stress throughout the switches. Besides, a voltage-doubling rectifier has been utilized in order to provide much high voltage gain and remove the reverse recovery issue of the output rectifying diode by partially operating in soft-switching condition. The proposed topology has been designed to operate as a front-end dc-dc converter and has the ability to boost a variable low voltage from a power source such as fuel-cell or solar panel, and then connect it to a high-voltage dc-link. The literature provides a detailed discussion of the suggested converter's various operational modes, as well as its steady-state performance, design procedure, and a comparison study with other converters. Furthermore, to demonstrate the converter's capabilities, an experimental prototype with a rated power of 500 W, an input voltage range of 30 V, and a 300 V output voltage at a switching frequency of60 kHz was built, and the experimental results are presented.