Multilevel H-Bridge Boost Inverters without Inductor for High Power Applications

Abstract

This paper presents a cascaded H-bridge multilevel boost inverter for high power applications implemented without the use of inductors. Currently available power inverter systems use a DC-DC boost converter to boost the battery voltage for a traditional three-phase inverter. These power inverters have low power density, are expensive, and have low efficiency because they need a bulky inductor. The proposed design uses a standard three-leg inverter and an H-bridge in series with each inverter leg which uses a capacitor as the dc power source. A fundamental switching scheme is used to produce a five-level phase voltage .This project shows that the proposed DC-AC cascaded H-bridge multilevel boost inverter can output a boosted ac voltage without the use of inductors.