Common Mode Currents in Resonant Circuits Generated with a Delta-Sigma Modulated Voltage Source Inverter

According to parasitic effects, unwanted resonant circuits occur in electric applications. In power electronic systems, resonances might be excited. Modulation methods are decisive for the frequency dependent voltage excitation generated by power electronic components. In this paper a delta-sigma modulated voltage source inverter is considered with the aim of reducing common mode disturbances. Simulative and experimental results are discussed in order to state out advantages and disadvantages in comparison to a pulse width modulation. Especially significant peaks in voltage spectra can be reduced with a delta-sigma modulated inverter.