A Self-Clamping Hybrid Active Switched-Inductor Switched-Capacitor DC-DC Converter With High Voltage Gain and No Voltage Oscillation

High voltage gain dc-dc converters are widely adopted in dc microgrid system. Many hybrid active switched-inductor (ASL) switched-capacitor (SC) dc-dc converters have been proposed due to their outstanding gain characteristics among nonisolated converters. However, resonance between the inductor and the parasitic capacitor of the switch can occur in this type of converter, which leads to significant voltage oscillation across the two switches. As a result, the actual voltage stress across the switches will be much higher than the theoretical value. In this article, a novel self-clamping hybrid ASL-SC converter is proposed. The proposed converter can utilize its inherent self-clamping structure to eliminate the voltage oscillation across the switches, which results in lower voltage stress across the switches. Additionally, the proposed converter also exhibits several intrinsic advantages: high voltage gain, lower voltage stress across the output diodes, higher efficiency, and a constant potential difference between the grounds of its input and output ports. This article describes the comprehensive performance characteristics analysis. Moreover, a detailed comparative performance is carried out with other similar converters. Finally, a 20–60 V/400 V, 50 kHz, 200 W experimental prototype has been established in the laboratory to evaluate the proposed converter.