Design and development of multilevel cascaded boost converter for multilevel inverter

Abstract

A converter that admits a constant DC input voltage and generates a changeable DC output voltage is known as chopper. Naturally the output voltage and input voltage are at different level. Resembling a transformer, it can be used to boost or buck a DC voltage supply. These converters are widely used for marine hoists, electric automobiles, forklift trucks, and trolley cars. The output voltages acquired from DC-DC converters are served to inverters to generate sinusoidal AC output supply. The Low DC output voltages obtained from PV panels, fuel cells need high gain converters in order to step up DC voltages. Only then it can be considered for connection with inverter circuit. Thus, the necessity of high gain converters is inevitable which motivate the researchers to go for constructing novel high gain converters. Hence, a new converter is proposed which links the elementary Cascaded Boost converter (CBC) along with Multilevel Boost Converter (MLBC) concept for increasing the voltages made from diverse sources like PV panel, fuel cell and Battery. Conventional high gain converters produce high voltage gain with a higher number of switches and high value of duty cycle, whereas the proposed circuit uses single switch and less duty cycle. The exceptional quality of Multilevel Cascaded Boost Converter (MLCBC) is the continuous input current, higher potential gain realized with reduced duty ratio, minor current stress, least component necessities and devoid of using a transformer. The main significant quality is that any integer of voltage stages can be augmented without troubling the main basic circuit. In recent converters voltage stress across the switch increases proportionally with respect to voltage gain whereas voltage stress across the switch remains almost the same even for large voltagegains newline