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.

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This paper presents a novel non-isolated dual output hybrid DC-DC multilevel converter. The proposed converter topology is suitable for photovoltaic applications where two voltages are needed at the same time with opposite polarity. The proposed DC-DC converter topology is the combination of two high gain multilevel DC-DC converters, one is multilevel boost converter and another is multilevel cuk converter. Two output voltages with opposite polarity are achieved by using only single switch and single input supply. Positive output voltage is obtained from multilevel boost converter and negative output voltage is obtained from multilevel cuk converter. The gain of the converter can be increases by adding appropriate number of capacitors and diodes without disturbing the main circuit. The proposed converter has been designed for photovoltaic applications with rated output parameters 200W, 240V and 200W, -228V. The input voltage is 12V and switching frequency is 50 KHz. The Proposed converter topology is simulated in MATLAB/SIMULINK.

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This paper proposes a novel non-isolated high step-up DC-DC converters for photovoltaic applications, where voltage is needs to be step-up without using transformer and coupled inductors. In this paper three novel DC-DC converter topologies are discussed in detail, which are suitable for photovoltaic applications. In this proposed converters, two similar inductors are charges in parallel when switches S 1 , S 2 are ON and discharges in series when switches S 1 , S 2 are OFF. The steady state analysis of proposed converters for continuous conduction mode (CCM) and discontinuous conduction mode (DCM) are discussed in detail. The proposed converters have been designed with rated power 200W, input voltage is 24V and switching frequency is 50kHz. The output voltage of the converter-I, II, III is 168V, 192V, 216V respectively. The simulation results will verify the validity of the analytical design of the proposed DC-DC converters. The proposed converter topologies are simulated in MATLAB/SIMULINK.