| Abstract |
When coupling the DC-link of a voltage source IGBT inverter to low-resistive, high current loads likelithium-ion batteries ripple currents emerge, causing additional losses or even damage to componentsexposed to it. The classical approach for damping DC ripple currents is to use electrolyte or film capacitorsat the DC-link of the inverter. This paper introduces an approach for partial substitution of DC-linkcapacitors by using a power electronic control element for active filtering of DC ripple currents. In orderto gain sufficient dynamic, the active filter power stage consists of fast switching silicon carbide (SiC)MOSFETs. A H-bridge topology is used for the active filter in order to enable bidirectional power transfer.Simulation results prove the effectiveness of the chosen approach. A simulative comparison betweenactive and passive filtering promises advantages for the design by reducing passive filter componentsat comparable efficiency. A test bench was setup to validate the simulations. Measurements confirmsimulations and prove the theoretical approach. |
