What is multilevel inverter? List different types of multilevel inverters and explain its principle of operation.
Answers
In this paper a brief review on different multilevel inverter topologies are discussed. Inverter is a power electronic device that converts DC power into AC power at desired output voltage and frequency. ... Multilevel Inverter generates a desired output voltage from several DC voltage levels at its input. There are essentially three types of multilevel inverters: Cascaded H-Bridges: Using H-Bridge Cascaded multilevel inverters, we can invert up to three voltage levels. Different positions of switches, determine different voltage levels. The circuit consists of diodes and switches. This is the most common type of inverter and usually uses Separate DC sources (SDCs). However, due to recent advancements, single DC source H-Bridge Cascaded inverters can also be formed. Diode Clamped: This type of inverter uses capacitors and diodes for inversion. The aim is to convert DC voltage into capacitor voltage. Proper precautionary measures should be taken in order to avoid over charging of capacitors. Flying Capacitor: This is a relatively complicated way of inversion, because the capacitors need to be pre charged, and is somewhat similar to diode clamped method. The difference is that clamping is done through capacitors instead of diodes