This paper presents conventional inverters, voltage source inverter (VSI), current source inverter (CSI) and impedance source inverter (ZSI). The drawbacks of VSI and CSI during shooting through state, advantage of ZSI as booster during shooting through is presented. Different types of impedance sources and their output equations are also indicated. Step by step proofs of mathematical relations is presented for the proposed impedance source inverters.

Key words: VSI, CSI, ZSI, shooting through