The operational principle of a classical converter of AC into AC energy is described in Section 1 Chapter 3. It includes an explanation of the basic idea on which the operation of the further down studied power electronic converters is based.
The basic indicators of a power electronic converter supplied by an AC power have been studied in Chapter 4. The conclusions made in it according the ways of the increase of the power factor KP are also valid in AC/AC converters. The purpose is to consume current with a waveform as close as possible to a sine wave (with low contents of harmonics) and whose first harmonic to be in phase with the source voltage.