Performance analysis of step up and step down cyclo converter

Cycloconverters directly convert ac power of one frequency to ac power of variable frequency. This variable frequency ac power can then be used to directly control the speed of ac motors. By using ac voltage controller magnitude of the voltage can be controlled and frequency can't be controlled but with Cyclo converters frequency also controlled. The drawbacks of voltage source inverter and ac voltage controllers are overcome by using Cyclo converter. For lower speed motors step down Cyclo converter is used. For high speed motors step up Cyclo converters are preferred. Cyclo converters are mainly used in variable speed motors such as Cement mill drives, Scherbius drives, Ore grinding mills, Mine winders and Rolling mill main drives. In this paper the performance of step up and step down Cyclo converter are analyzed to an no load conditions.