A New Three-Level Quadratic (T-LQ) DC-DC Converter Suitable for Fuel Cell Applications

摘要

This paper presents a new non-insulated three-level DC-DC boost converter with quadratic static gain. The quadratic feature is interesting for applications where a wide voltage range is necessary. The voltage across the switches is smaller then the output voltage. Since it is a current-source converter, its application in fuel cell energy conversion systems seems interesting, but other applications where the involved voltages are higher is very possible. Theoretical analysis for CCM of operation and experimental results are presented. A comparison between the two cascaded boost converter, the single switch quadratic boost converter and the proposed converter is made regarding commutated power. By experimental results is shown that the efficiency of the proposed converter is higher than two cascaded boost converters, even with less installed semiconductor power.