Comparison of Sine-wave inverter topologies: Infinite-Level inverter and Differential inverter

The classic bridge inverter is outclassed by pulse width modulated voltage source inverters (PWMVSI), yet PWM inverters still face significant difficulties. Device restriction and significant switching loss cause major issues when power and voltage ratings increase. A variety of pulse width modulation techniques, including sinusoidal, third harmonic injection, and space vector PWM (SVPWM) use high frequency switching to provide high-quality output voltage with little ripple. In a multi-level inverter, increasing the number of active switches and passive components is necessary to raise the voltage levels. Compared to two-stage conversion, single-stage conversion has a more compact design, a better power density, and a cheaper cost. Two inverter topologies which produce sine wave output in single stage conversion are infinite level inverter and differential inverter. The infinite level inverter topology has a buck based active front end followed by an H-bridge. Differential inverters are single-stage, bidirectional DC-AC converters that can step up or down and invert the DC voltage. Three converters make up the majority of a differential inverter. Depending on the output needs, it can be a buck, boost, or buck-boost. The two converters are controlled so that the difference between their outputs produces an AC voltage at the desired frequency. In this paper infinite level inverter and buck converter based differential inverter is compared. Total switching device power, passive component requirement, and efficiency of each of these inverters were calculated. For purposes of comparison, both the inverters are given the same load, modulating signal and are operated from same DC voltage source to compare the losses and efficiency.