A Non-Isolated Quadratic DC-DC Converter Improved by Voltage-Lift Technique Suitable for High-Voltage Applications

Abstract

Non-isolated DC-DC converters are better than isolated converters from aspects such as their lower mass, volume, and cost and higher efficiency and power density. This study proposes a non-isolated high-step-up DC-DC converter. This converter employs a voltage-lift technique in addition to the characteristics of quadratic topologies, enabling it to achieve higher voltage gains even with low-duty cycles. The provided common ground of the load and source, continuity of the input current, and low current stress of the semiconductors are the other features of this converter. The converter’s operation is discussed in both the ideal and non-ideal modes. Additionally, the proposed topology is compared with the recently suggested topologies from various points of view, such as voltage gain in all duty cycles, voltage gain density overall duty cycles, and voltage gain density over each type of component. Finally, the experimental results are discussed and compared with the design considerations. The prototype of the proposed topology is for a 190 W output power, 960 V output voltage, and 60 V input voltage.

Keywords

• Boost converter
• high-gain dc-dc converters
• non-isolated DC-DC converters
• voltage-lift technique