I want to make a 5 level using H-bridge. I have made H-bridge using MOSFETS and it works. My problem comes when adding output of these two H-bridges to get 5 voltage levels. I am adding the outputs like we join two batteries in series but for some reason it is not working with my circuit. Can anyone help me with this?

Circuit in Proteus

  • \$\begingroup\$ In effect you are connecting two parallel batteries but in antiphase and nothing good is going to happen from that. \$\endgroup\$
    – Andy aka
    Jan 9, 2022 at 13:43
  • \$\begingroup\$ Do you have a reference where two H bridges can be connected to give a 5-level inverter? \$\endgroup\$ Jan 9, 2022 at 15:56
  • \$\begingroup\$ Do more reading Neutral Point Clamped (NPC), Cascaded H-Bridge (CHB), Flying Capacitor Converters (FCC), and Modular Multilevel Converters (MMC) \$\endgroup\$ Jan 9, 2022 at 16:34
  • \$\begingroup\$ Have you mastered the 2 level converter yet? yumpu.com/en/document/read/18800114/… Do not skip ahead until you do. \$\endgroup\$ Jan 9, 2022 at 16:43

1 Answer 1


In case someone comes in future and sees it. You need to give negative voltage to gate of P-MOSFET instead of ground to turn it ON. Doing that will make it work.


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