A Novel High Gain Floating Output DC-DC Multilevel Boost Converter for Fuelcell Applications

This paper presents a novel high gain floating output DC-DC multilevel boost converter. This circuit topology is suitable for fuel cell applications, where input supply voltage is needs to be lift with high conversion ratio. Floating output helps to separate the system from the ground related interference problems. The gain of the floating output DC-DC multilevel converter can be increased by adding capacitors and diodes at the output side. 2N-1 capacitors and 2N-1 diodes are required for designing N-level floating output Dc-Dc multilevel converter. The advantage of multilevel converter is the voltage stress across each device is less, so low voltage devices are applicable for proposed topology. The proposed converter topology is designed for unidirectional power transfer applications. The proposed converter has been designed for five levels with rated power 400W, input voltage is 24V, output voltage is 450V and switching frequency is 50kHz. The simulation results are verified through MATLAB/SIMULINK.