The more I tested the GMKtec NucBox M7 Ultra, the less it looked like it justified its Ultra moniker

The GMKtec M7 Ultra is a replacement for earlier M7 designs, but fails to perform as well.
EDN

Power Tips #149: Boosting EV charger efficiency and density with single-stage matrix converters

Understanding the benefits of matrix converters for EV chargers and a comparison of different matrix converter topologies.