Common Mode Currents in Resonant Circuits Generated with a Δ-Σ Modulated Voltage Source Inverter

Abstract:
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 δ-σ 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 δ-σ modulated inverter.