Three- to single-phase converters with a switch-controlled interphase transformer for low-distorted supply of resistive loads

A comparative evaluation of three- to single-phase power converters with a switch-controlled interphase transformer is given. Design and optimization principles of the phase converters with both close to rectangular and sinusoidal output voltage waveforms have been analyzed and experimentally evaluated. In the case of a single-phase resistive load and rectangular output voltage, the conversion can be carried out using only a properly controlled time-variable transformer. For a complex load and/or sinusoidal output voltage in addition to the time-variable transformer, a controlled energy storage element is required. Performance characteristics of three 12-pulse converters with a switch-controlled interphase transformer have been described