A New Continuous Modulation Scheme for Differential Mode Boost Inverter

This paper presents two different modulation schemes for the non-isolated differential mode boost inverter (DMBI). In DMBI, two non-isolated DC-DC boost converter modules are connected differentially across the load to produce a sinusoidal output voltage. Each converter produces unipolar voltage. This topology eliminates the need for a two-stage conversion process to get higher AC voltage from a low-level DC voltage source. In this paper, an analysis and comparison of a Conventional Continuous-mode Modulation Scheme (CCMS) and a new Modified Continuous-mode Modulation Scheme (MCMS) is presented. MCMS reduces the dc offset voltage for each converter module which helps in a lesser stress on the semiconductor devices. Moreover, a steady-state equivalent circuit is developed that provides a physical and intuitive way to evaluate the steady-state performance of the inverter. Finally, the effect of non-idealities on the inverter performance is also evaluated, which depicts that the inverter gain is highly dependent on non-idealities.