Novel Multilevel Inverter using Switched Capacitor unit with Voltage Boosting feature for EV Applications

A novel hybrid switching capacitor (SC) based multilayer inverter (MLI) is available for electric vehicle (EV) applications. The suggested unit (SCMLI) uses a series and parallel conversion strategy to enable self-balancing of the capacitor voltage as well as higher voltage with any number of SC cells. The switched converter that is bidirectional can be used with DC source to provide intermediate voltage levels, improving the output power quality. For a considerable phase mismatch between the output current and voltage, many active switches will be replaced by diodes. The proposed SCMLI is better for EV applications since the voltage level of ripple in SC units will be inversely related to the output in fundamental frequency. This article covers the working model of the recommended inverter employing staircase modulation with circuit and corresponding switching state descriptions. Additional mathematical computations are available for ripples in capacitor voltage, size, and power loss. Two units of SC units are linked with a string of voltage source and 3 symmetric dc sources to form a seven-level MLI with a voltage gain of three. The suggested inverter's functionality and performance were validated by simulation on the inverter. When the 7-level staircase output was modulated at the fundamental frequency, the inverter worked properly and the power quality was satisfactory.