Single-Inductor Boost Converter With Ultrahigh Step-Up Gain, Lower Switches Voltage Stress, Continuous Input Current, and Common Grounded Structure

DC-DC boost converters with better performances, including improved voltage gain, efficiency, power density, and reliability, are urgently needed for wide conversion range applications. In this article, a single-inductor boost converter (SLBC) with ultrahigh voltage boosting capability is proposed and analyzed. For the SLBC, low-voltage-rating MOSFET with small on-resistance can be chosen and losses of switches can be reduced owing to the lower switches voltage stress and intrinsic small duty cycle, which are conducive to enhance the system efficiency. The single inductor of the SLBC is in series with its input source, therefore, continuous input current and high power density are attainable. Moreover, the SLBC has common grounded input and output terminals, which is benefit to avoid the du/dt issues and achieve reliable output. The operational principles of steady-state mode and small-signal mode are presented to analyses the SLBC in detail. Based on these, performance comparisons with other typical converters and 250-W experiment prototype are implemented to validate the feasibility and effectiveness of the SLBC.