Derivation and characterization of switched-boost inverter

Z-source inverter (ZSI) employs an LC impedance network between the main inverter bridge and the power source. This impedance network consists of two inductors and two capacitors, which causes significant increase in the size of the power converter. Moreover, for stable operation of the converter, this impedance network has to be perfectly symmetrical which is difficult to achieve in practice. In this paper, an alternative implementation of the ZSI is derived. The resulting topology is called Switched Boost Inverter (SBI). It has half the number of passive components when compared to ZSI while retaining its primary operational advantages. This paper explains the steady state operation and small signal behavior of the switched boost inverter. A laboratory prototype is used to validate the theoretical analysis. Experimental results show good correlation between theory and experiments.