Y.R. Manjunatha  , M.Y. Sanavullah  , 
    Generation of Equal Step Multilevel Inverter Output Using Two Unequal Batteries,
    International Journal of Electrical and Power Engineering,
    Volume 1,Issue 2,
    2007,
    Pages 206-209,
    ISSN 1990-7958,
    ijepe.2007.206.209,
    (https://makhillpublications.co/view-article.php?doi=ijepe.2007.206.209)
    Abstract: In response to the growing demand for high power inverter unit, multilevel inverters have been attracting extensive attention from academia as well as industry in the recent decade. Among the best-known topologies are the H-bridge cascade inverter, the capacitor clamping inverter and the diode clamping inverter. In a three phase multilevel inverter, each phase of a cascaded multilevel inverter requires n DC sources to obtain 2n+1 output voltage levels. This study proposes a cascaded multilevel inverter with two unequal battery sources instead of three equal voltage battery sources for one phase to generate 7 level equal step output voltage waveform. This system can be used to drive a 3 phase Induction Motor of electric/hybrid electric vehicle, so that the cost and size of batteries can be reduced.
    Keywords: Cascaded H-bridge multilevel inverter;unequal battery sources;induction motor;capacitor clamping inverter