High Boost Ratio Hybrid Transformer DC-DC converter for Photo voltaic Applications

Due to the rising cost of non-renewable energy sources and because of energy shortage green gas effect it is more important to utilize the renewable energy sources such as solar power. This paper presents non isolated high boost ratio dc-dc converter with hybrid transformer for low voltage renewable energy sources. The proposed converter utilizes a hybrid transformer to transfer inductive and capacitive energy simultaneously, achieving a high boost ratio with a smaller sized magnetic component. The turn off loss of the switch is reduced, increasing the efficiency of the converter under all load conditions. By changing the input voltage stresses on the active switch and diodes are maintained at a low level and are independent as a result of the converter. The effectiveness of the proposed converter was experimentally verified using a 220 W prototype circuit Utilizing an input voltage ranging from 20V to 45V and a load range of 30W to 220W,the experimental results show system of efficiencies greater than 96% with a peak efficiency of 97.4% at 35V input. Due to high system efficiency as well as ability to operate with a wide variable input voltage, the proposed dc-dc converter is an attractive design for alternative low dc voltage sources, such as PV modules and fuel cells.