High Step Up Dc-Dc Converter For Non-Conventional Energy Source
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Abstract
The demand for non-isolated high step-up dc–dc converters in applications such as dc backup energy systems for UPS, photovoltaic
and fuel cell systems, and hybrid electric vehicles has been gradually increasing. This project proposes a non-isolated step-up dc–dc converter
with an improved switching method. The proposed converter shows zero-voltage switching turn-on of the switches in continuous conduction
mode as well as reduced turnoff switching losses using resonant PWM.As a result of the proposed switching method, the switching losses
associated with diode reverse recovery become negligible even in the small duty cycle. The capacitance in the auxiliary circuit is significantly
reduced compared to the pulse width modulation method. The duty cycle loss is further reduced resulting in increased step-up ratio.The result of
the project is implemented in Simulation using MATLAB Simulink Software.
Key Words: Photovoltaic and fuel cell,, Step up DC-DC conversion.
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