A Fuel-Cell-Oriented Asymmetric Isolated DC-DC Converter with Low Input-Current Ripple
Year: 2026
Type: conference-paper
Abstract: Fuel cells are highly sensitive to input current ripple, which can accelerate membrane degradation and reduce operational lifetime. To address this issue, this paper presents a fuel-cell-oriented asymmetric isolated DC-DC converter that achieves low input current ripple without relying on bulky external filtering components. The proposed design prioritizes ripple suppression exclusively at the source side, while allowing controlled ripple at the load side, which is acceptable for downstream DC buses. By establishing a primary-side differential-mode energy confinement loop, switching-frequency ripple is prevented from propagating into the fuel-cell stack. In addition, the converter retains the fundamental advantages of the Dual-Active-Bridge (DAB) family, including soft switching operation for all switches and simple Single-Phase-Shift (SPS) control. A 500 W laboratory prototype operating from 100 V to 200 V is used to validate the proposed concept, achieving a peak efficiency of 97.4% and a peak-to-peak input current ripple of only$\mathbf{3. 2} \boldsymbol{\%}$under full-load conditions.
Authors: Vu-Khanh Hong, Po-Hsuan Chen, Trong-Nha Quang
Institutions: National Formosa University, Advanced Energy (United States)
Language: English
Topic: Advanced DC-DC Converters
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
OpenAlex ID: W7202215714