An Isolated High Step‐Up Gain DC–DC Converter With Wide Input Voltage Adaptability

ABSTRACT This paper presents an isolated high step‐up gain DC–DC converter that combines switched‐inductor units with an isolated converter topology. By integrating a switched‐inductors based front‐end boost circuit and employing a pulse width modulation strategy, the converter achieves significant improvement in both voltage gain and input voltage adaptability without requiring additional switching devices. It accommodates input voltage fluctuations of over ±40% from the rated value, making it well‐suited for applications such as integrating fuel cells or photovoltaic systems into DC microgrids. A 1 kW experimental prototype was developed to validate converter performance. Test results show that the converter maintains a stable 540 V output from a 28–60 V input and achieves a peak efficiency of 95.7%.