Common-mode interference suppressor for chopper circuit based on negative capacitance: Applications and improvements

In this paper, the common-mode interference of a typical buck chopper circuit is studied, and it is shown that the parasitic capacitance between IGBT module and the ground dominates the level of the interference. To eliminate the parasitic capacitance and suppress the interference, a common-mode interference suppressor is introduced, which is based on negative capacitance techniques. Simulation and experimental results indicate the validation and limitation of this suppressor. Finally some measures are discussed to overcome the shortcomings and improve the performance of it.