Matrix converter commutation strategies with and without explicit input voltage sign measurement

This paper gives an overview to voltage-controlled matrix converter commutation. Conventional converter systems with explicit sign measurement circuits that were necessary for the commutation in the past are discussed. New operation methods eliminating these extra measuring circuits are presented. The paper explains the new methods. Advantages and disadvantages of different approaches are discussed. The robustness of the new methods against disturbance is proved and measurements on a 5.5-kW matrix converter system are shown.