| Abstract |
Power electronics at high power levels often implies too high harmonic contents, which usually result in excessive losses and in motor pulsating torques; moreover very high power cannot be obtained when adopting traditional converter topologies, unless using always problematic series/parallel combinations of semiconductor devices. This paper presents a modular approach to converter design based on a particular connection of single-phase H-bridge inverters, which is particularly suitable when both reduced harmonic contents and very high power are required. A multilevel delta modulator suited to the peculiar structure has been devised, which allows a proper functioning of the connected asynchronous motor. An analytical analysis, simulation and experimental results are reported . |
