High gain Boost Converter with reduced switching stress

Abstract

This paper deals with the simulation and implementation of a high gain Boost Converter with reduced switching stress. Requirement for high gain i.e. high step-up non isolated DC to DC converter is increasing. Applications like renewable energy systems, fuel cells and UPS require the DC - DC conversion to an level applicable to microgrid applications (140V). The conventional step-up converter faces lot of constraints such as the switching stress and efficiency. The proposed topology aims at satisfying the constraints of switching stress and efficiency. For a classic boost converter though it can provide a high output voltage with a smaller duty ratio while switch voltage stress and low efficiency are the drawbacks. The specific characteristics include the static gain as a function of duty cycle and reduced switch stress. The proposed topology uses a voltage doubler which provides higher voltage for a smaller duty operating with interleaving action. The use of clamped capacitor that has been combined with the conventional boost converter to get high step-up conversion ratio. The conversion ratios are smaller than classic converter. By increasing the number of capacitors, conversion ratio can be increased with small penalty on conduction losses.