A Wide-Range Operation High-Gain DC–DC Converter With Bidirectional Symmetrical Drive Characteristics

This paper proposes a novel bidirectional non-isolated DC-DC converter. This converter features symmetrical drive characteristics, achieving reverse voltage gain in both forward boost mode and reverse buck mode while maintaining the same duty cycle. Moreover, with fewer components and a simple control algorithm, the efficiency and reliability of the converter have been enhanced. Under non-extreme duty cycle conditions, the converter achieves high voltage gain and wide-range output voltage regulation in the forward boost mode. In addition, it also features low input current ripple, continuous input current, and a common ground between the input and output. This paper expounds the working principle and parameter design of the converter, and analyzes the working characteristics of the converter, including voltage gain and voltage stress. Build a 400W experimental prototype with a low-voltage side of 40V to 150V and a high-voltage side of 400V. The experimental results show that under the conditions of input voltage fluctuation and load switching, the output can remain stable during both the forward voltage increase and reverse voltage decrease processes. The voltage stress between components is relatively low, and the converter has a good dynamic response. Under rated working conditions, the efficiency can reach up to 96.23% at most. The experiment verified the feasibility of the converter.