I want to design a 3 phase cyclo-converter to run a 7.5kW induction motor. The input to the cyclo-converter is 50Hz AC and the output of the cyclo-converter should be 60Hz AC. What are the specific ratings of thyristors for designing the above? Solution As per Wikipedia\'s page on cycloconverters, firstly they are only used for producing a lower frequency. Secondly, they are only financially sensible at megawatt powers. As for thyristors\' ratings, they will be in their respective datasheets. A Google search for \"50Hz to 60Hz\" gives a plethora of options for achieving what you want. There are plenty of off-the-shelf solutions as well as cheaper home-brew methods. .