Improved low-ripple input current high-step-up DC-DC converter with switched inductors

Aiming at solving the problem of the low output voltage of fuel cell systems, this paper proposes a new type of high-gain low-ripple passive clamping common ground boost converter, which is based on the research of a traditional switched inductor converter. In addition to greatly improving the voltage gain, it has a number of advantages. (1) The specific structure achieves almost zero input current-ripple and prolongs the service life of fuel cells. (2) The passive clamping circuit solves the problem of the switches voltage resonance caused by inconsistent circuit component parameters, reduces the voltage stress of the switches, and enhances the output voltage gain of the system. (3) The input and output sides share a common ground, which effectively suppresses electromagnetic interference and other issues. In this study, the working principle, steady-state characteristics, comparison study, and component parameter design of the proposed converter are introduced in depth. Finally, the correctness and feasibility of the theoretical research of the proposed converter are validated by experimental results.