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I am working on Multilevel Inverter and successfully achieved modified sine wave with 7 level, that is much better according to my requirement. But the problem is output AC voltages is too low which is 10-12 VAC. Every thing works fine. Output frequency is 50Hz and required modified sine wave are achieved. How can I increase this low AC voltages to 180-220 VAC with 0.25 watt? In Input side I connect 3 individual batteries with 12 Volt DC 1 Amp. Here is the circuit Diagram of my 7-level H-bridge inverter.

enter image description here The output modified Sine wave of my result is here.

enter image description here

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    \$\begingroup\$ Using a transformer? \$\endgroup\$ – Long Pham Sep 22 '18 at 7:43
  • \$\begingroup\$ Your schematic shows three 12 V H-bridge circuits connected in series. Why not connect the batteries in series and use one 36 V H-bridge? You are looking for about 1 mA at 220 V AC? \$\endgroup\$ – Transistor Sep 22 '18 at 7:44
  • \$\begingroup\$ @LongPham I think you suggest just add 1:22 ratio transformer ? \$\endgroup\$ – Abdul Basit Sep 22 '18 at 7:52
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    \$\begingroup\$ Holy moly! MLC are usually only used for traction and HVDC applications in the MW range. Why on earth would you use it for 250 mW? \$\endgroup\$ – winny Sep 22 '18 at 8:44
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    \$\begingroup\$ Build a simple sine wave oscillator and drive a transformer! \$\endgroup\$ – Andy aka Sep 22 '18 at 9:16
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Using the transformer, the voltages are step up and its working. Step up Transformer resolve my issue.

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