| Abstract |
As high efficiency is on everyone's lips, this paper studies an inverter using a ZVS modulation schemepromising high efficiency. It uses triangular current mode (TCM) to minimize the ripple while maintaining ZVS. In order to fulfill the required power density, high switching frequencies should be applied. Current threshold detection circuits in combination with this modulation scheme turn the inverter's legs into current sources. Since all phases of the inverter are tied together at the load's star point, there might be issues, if slight current threshold errors exist within the inverter. In order to demonstrate that the modulation scheme can handle situations with and without connection of the load's neutral point to the DC-link midpoint, both configurations are studied in a practical setup. The practical test setup gives satisfactory results with respect to the quality of the output waveforms using the THD of the currents. |
