Abstract In this paper, a non-isolated buck-boost dc/dc converter with only one switch is presented. The proposed converter consists of one switch in the input side (S), four inductors, four diodes, six capacitors and a capacitor in the output side (Co). In fact, the combination of the inductor, diode and capacitor leads voltage level is increased. Actually, the voltage stress on power switch is decreased for higher power limits at various duty-cycles by combining these components. Therefore, conduction losses can be reduced by using a switch with lower resistance RDS(ON). Another advantage of the proposed converter is that the normalized voltage stress on diodes is low. As a result, the efficiency of proposed converter is high. In order to investigate the competences of the proposed converter, comparison results with other structures are provided. The principle of operation, theoretical analysis and the experimental prototype of proposed converter in about 120 W with operating at 25 kHz are provided.

A Buck-Boost DC/DC Converter with High Efficiency Suitable for Renewable Energies

Currently, there are a lot of renewable energy potential research focusing on the potential of photovoltaic and fuel cell. However, the main problem in photovoltaic and fuel cell application is only able to generate low output voltage. In order to increase the voltage, converter device is required before applied to the load. The dc-dc boost converter is one kind of converter which used for increasing output voltage. However, a conventional boost converter is only optimally worked in 2–3 times conversion rate of the input voltage, so this converter can not supply the load with high voltage rate. This research implements high voltage gain converter based on B×B topology for fuel cell application. The advantages of high voltage gain dc-dc boost converter is having conversion rate and high efficiency also has a simple implementation and it will be compatible to be applied in renewable energy sources with dc low voltage, such as photovoltaic and fuel cell. From the implementation results, the high gain dc-dc converter can improve the voltage gain about 4.5 times and able to be implemented with fuel cell application.

Implementation of High Voltage Gain DC-DC Boost Converter for Fuel Cell Application

This paper proves worth with a single switch (non-isolated) with less duty cycle, with reduced voltage stress and lower voltage rating of MOSFET having less R DS -ON, reduced switching loss, a very high voltage gain has been achieved. The topology proposed works the same, under any change in load conditions. The modes of operation and the steady state analysis of the proposed dc-dc converter topology has been discussed and derived. The theoretical voltage gain has been proved with simulation results using PSIM simulation software for the proposed converter topology.

R. Nandhini

Papers

Analysis of high voltage gain DC-DC boost converter for renewable energy applications