A novel high gain floating output DC-DC multilevel boost converter for fuelcell applications

Abstract

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.

Efficient Topology for DC-DC Boost Converter Based on Charge Pump Capacitor for Renewable Energy System

“…At switching instants, the transformer parasitic will result in high voltage spikes across the switches [20]. The voltage and current spikes lead to increased losses and reduced reliability and may damage circuit components [21][22][23]. A study of some DC-DC converter is discussed in detailed [24].…”

No-Isolated High Gain DC/DC Converter with Low Input Current Ripple Suitable for Renewable Applications

“…Switched capacitor techniques are used in [15] for increasing the voltage gain of the converter, which is consisting three capacitors and three diodes, is in charge of providing some of upper output voltage level derived on conventional switched capacitor topologies. In [16], a dc-dc converter is proposed based on conventional boost which the main drawbacks of the converter including pulsating input current, a high value of current in the start state and also a large number of power diodes and capacitors are required. In [17], the proposed topology is developed by combining boost and single-ended primary inductor converter with diode-capacitor unit to decrease the voltage stress values across the power switch and diodes.…”

Power switch failures tolerance and remedial strategies of a 4-leg floating interleaved DC/DC boost converter for photovoltaic/fuel cell applications

“…In order to satisfy the high voltage ratio requirements, improvements have been carried out on boost topologies. For instance, cascaded boost converter [29], boost converter with switched capacitors [30], three-level boost converter [31], floating output DCeDC multilevel boost converter [32], and integrated double boost SEPIC [33,34], can be used for this purpose. In spite of the voltage ratio improvement, these topologies suffer from having high input current ripple in keeping small inductor value and volume.…”