Cyclo-converter circuits

Claim 1

A CYCLO-CONVERTER CIRCUIT FOR CONVERTING A MULTIPHASE ALTERNATING CURRENT SUPPLY OF ONE FREQUENCY INTO AN ALTERNATING CURRENT SUPPLY OF ANOTHER FREQUENCY, COMPRISING INPUT TERMINAL MEANS ADAPTED FOR CONNECTION WITH THE PHASE TERMINALS OF THE ALTERNATING CURRENT SUPPLY, RESPECTIVELY; A PAIR OF OUTPUT TERMINALS ADAPTED FOR CONNECTION WITH A LOAD; FIRST AND SECOND SETS OF CONTROLLABLE UNILATERALLY CONDUCTIVE SWITCHING DEVICES EACH HAVING FIRST AND SECOND POWER CIRCUIT ELECTRODES AND A CONTROL ELECTRODE, THE FIRST POWER CIRCUIT ELECTRODES OF SAID FIRST SET OF SWITCHING DEVICES BEING CONNECTED WITH ONE OUTPUT TERMINAL AND THE FIRST POWER CIRCUIT ELECTRODES OF SAID SECOND SET OF SWITCHING DEVICES BEING CONNECTED WITH THE OTHER OUTPUT TERMINAL, THE SECOND POWER CIRCUIT ELECTRODES OF EACH OF SAID FIRST AND SECOND SETS BEING CONNECTED WITH SAID INPUT TERMINALS, RESPECTIVELY;