Patent ID: 9184673
Filing Date: 2015-11-10
Classification: A61B,B26B,H02M,H02P

Abstract:
1. A method for controlling a switching device of a multilevel converter, comprising: dynamically selecting a carrier signal, and generating a pulse width modulation signal to effect a switching event of the switching device based on a comparison of the dynamically selected carrier signal with a reference signal, wherein the carrier signal is dynamically selected from a plurality of carrier signals, each of the plurality of carrier signals corresponding to one of a plurality of contiguous bands into which a range of a waveform of the reference signal is divided, the carrier signals corresponding to different bands having differing waveform shapes, and wherein the dynamically selected carrier signal corresponds to a band that is instantaneously occupied by the reference signal, the dynamic selection being carried out whereby whenever there is a transition of the reference signal from a first band to a second band, the carrier signals selected for the first band and the second band are dependent on a slope of the waveform of the reference signal at the transition.