Three-phase To Two-phase Matrix Converter with Reduced Switches

Abstract

bstract-AC-AC     Statistic     Matrix     converter,     also     called     frequency  converters,  is  the  most  widely-used  and  first  power  electronics    systems.    These    converters    are    conventionally    designed  and  produced  with  an  AC-DC-AC  structure  (i.e.  a  middle  DC  circuit  is  used).  The  used  filter  in  the  middle  circuit  causes system loss and increases the circuit volume. On the other hand, because of the short lifetime of electrolyte capacitors used in  the  middle  DC  circuit,  reliability  decreases.  The  direct  AC-AC   converter   does   not   have   such   weaknesses,   but   the   bidirectional  switches  have  not  been  developed  enough  and  because  of  commutation  problems,  these  converters  are  not  suitable   replacements   for   the   AC-DC-AC   converters.   To   produce  two  phase  voltage,  Scott  transformers  are  mostly  used  for  industrial  purposes.  But  the  cost  and  the  core  loss  of  Scott  transformers  are  much  higher  than  the  matrix  converters.  In  this paper, a two-phase matrix converter is introduced, inwhich he number of switches are reduced as much as possible in order to    decrease    the    switching    losses    and    to    eliminate    the    commutation   problem   in   line   side.   Simulation   results   are   presented showing the proposed circuit and it's control working good enough.