• Sudharani
• Manish Rathi

Multilevel inverters are designed to produce desired output voltages from different DC sources. This includes high quality output voltage, reduction of voltage stress on the switches, low common mode voltages, better harmonic content and reduction in total harmonic distortion. As there will be reduction in THD the size of the filter will also get minimized which decreases complexity of the system. Multilevel inverter employs sinusoidal pulse width modulation technique to get undistorted output voltage by eliminating lower order harmonics. By varying the modulation index ratio output voltage levels can be varied. Cascaded multilevel inverters are most preferable because of its modularity, reliability, less usage of clamping diodes and ease of control of circuitry. Cascaded multilevel inverters also reduce the switching and conduction losses of the system.By connecting several modules of multilevel inverter in series configuration desired output level can be achieved. Cascaded H-bridge multilevel inverter produces both positive and negative voltage levels. These multilevel inverters are widely used in industrial as well as domestic appliances and the demand has been growing day by day for the continuous supply of power.

Multilevel Inverter; Transformer; DC voltage source

"CASCADED H-BRIDGE FIVE LEVEL INVERTER WITH REDUCED SWITCH COUNT USING SINUSOIDAL PULSE WIDTH MODULATION TECHNIQUE", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 6, page no.736-741, June-2019, Available :http://www.jetir.org/papers/JETIR1906397.pdf

"CASCADED H-BRIDGE FIVE LEVEL INVERTER WITH REDUCED SWITCH COUNT USING SINUSOIDAL PULSE WIDTH MODULATION TECHNIQUE", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 6, page no. pp736-741, June-2019, Available at : http://www.jetir.org/papers/JETIR1906397.pdf