A theoretical and practical consideration of optimised input filter design for a low loss matrix converter

This paper reports the construction and testing of a matrix converter in which novel switching methods are employed to minimise the losses in the switching devices. A mixture of hard and soft commutation is used during each cycle of the output waveform. This permits losses to be reduced to a minimum while waveform quality is enhanced. IGBTs are used as the switching devices and a microcontroller generates the switching waveforms and provides control. The problems associated with input current filtering to comply with existing and possible future European EMC regulations are investigated. The paper compares results from mathematical theory, computer simulation, and a power level converter under microprocessor control. Reactive components have been minimised so that the matrix converter is now approaching an all-silicon solution to AC-AC power conversion