The Cycloconverter Principle can be understood by considering simple resistive load ‘R’. Let us now first consider single phase to single phase step up cycloconverter in which output frequency obtained is greater than the supply frequency.
The basic Cycloconverter Principle can be explained with reference to an equivalent circuit shown in figure 2.1. Each 2 quadrant converter is currently depicted as Associate in Nursing alternating voltage supply, that corresponds to the basic or wished voltage part generated at its output terminals. The diodes connected serial with every voltage supply shows the unidirectional physical phenomenon of every 2 quadrant converter. If the ripple within the output voltage of every converter is neglected, then it becomes ideal and represents the specified output voltage.
The basic principle of a perfect cycloconverter is to continuously modulate the firing angles of the individual converters so everyone produces constant sinusoidal ac. the voltage at its output terminals. Thus, the voltages of two} generators in figure 2.1 have a constant amplitude, frequency and section and also the voltage at the output terminals of the cycloconverter is up to the voltage of either of those generators. it’s doable for the mean power to flow either “to” or “from the output terminals and also the cycloconverter is inherently capable operation with various any point inside an entire spectrum 360°.
Because of the unidirectional current carrying property of the individual converters, it is inherent that the positive half-cycle of 1 current must always be carried by the positive converter and the negative half-cycle by the negative converter, regardless of the phase of current with respect to the voltage. This means each two-quadrant converter operates both in its rectifying and in its inverting region du the period of its associated half-cycle of current.