Power Source / Sink Inverters for high efficiency EV Battery Charging and Solar Energy Generation on Three-Phase Utility
The race for power conversion efficiency over 99% continues. New innovative topologies are competing with the standard half-bridge topology using SiC and GaN semiconductor technologies. Requirements for high-efficient power conversion both unidirectional and bidirectional are getting standard in the wide field of applications ranging from EV battery chargers, solar inverters and UPS to industrial drives with built-in or separate PFC. In order to be able to make further cutting on the remaining losses of the power conversion, the process requires deep analyses on the loss composition. The main sources of the losses originate from the non-ideal static and switching characteristics of the power semiconductors. The second highest contribution to losses comes from the parasitic of passive components like inductors, transformers and capacitors. Finally, but not with less importance, the applied control strategy plays a definitive role in the overall efficiency of the whole conversion process. The strategy of Power Sink / Source Inverter (PSI) control shows improvement compared to Voltage Source Inverter (VSI) and Current Source Inverter (CSI) solutions widely used in three-phase systems…
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