Soft-Switched Non-Isolated Double-Input High Step-Up Converter With Low Input Current Ripple

Abstract

This paper proposed a novel high step-up converter with a dual-input, single-output DC–DC converter configuration. The design achieves a high conversion ratio while reducing voltage stress on switching devices and enhancing overall efficiency. The design involves an auxiliary circuit to provide zero-voltage switching conditions for the main switches, and utilizes voltage multiplier circuit (VMC) methods to improve conversion ratio. The VMC effectively clamps the voltage of the switches at low levels, enabling the use of switches with low on-resistance. This approach not only reduces the overall cost of the converter but also improves efficiency. The proposed two input configuration can effectively deliver power to the load from two separate voltage sources, ensuring continuous input current with low ripple. This feature makes the converter an ideal choice for wind, hybrid, and photovoltaic applications. The article provides a comprehensive analysis of operational modes and steady-state performance, along with a comparison section of the proposed structure's performance. Furthermore, a prototype of the suggested converter is implemented for an output power of 160 W at a switching frequency of 100 kHz to validate the performance, and the theoretical analysis, which results in an efficiency of 96% under full load conditions.