Reduced Inductor Hybrid Voltage Multiplier Boost Converter with Less Ripple and Voltage Stresses

This paper proposes a DC-DC hybrid voltage multiplier boost converter (HVMBC) that provides a high step-up conversion ratio, reduced input current ripple, and low voltage stresses on semiconductor devices designed for DC micro-grid application. A diode capacitor cell (DCC) is used as a hybrid voltage multiplier cell in the proposed HVMBC. The DCC consists of two identical capacitors connected in a cross between two parallel diodes. Due to the reverse and forward biasing of the two diodes in the DCC, a series-parallel transition occurs between the two identical capacitors, enhancing the voltage conversion ratio. As a result of this series-parallel transition, the load current flow abruptly changes. To prevent this sudden change in output current, an additional diode is connected to the output filter capacitor further helping the enhancement of the voltage conversion ratio. Thus, the modified high voltage conversion ratio helps to achieve high output voltage at the same duty cycle compared to existing converters and reduces the ripple in input current and voltage stresses on semiconductors. Power losses are analyzed and 97.99 % efficiency is achieved. Finally, a 300 W prototype of the proposed HVMBC is built and experimental results are presented.