Researching on Multiple “Phase Hopping” AC-AC Frequency Conversion Circuit

Abstract

Frequency converter is a kind of important energy-saving device. As a kind of improved cycloconverter, the "phase hopping" AC-AC frequency converter can increase the output frequency to close to the line frequency and has the advantages of no circulation current and no dead zone. By combining multiple-stage AC-AC frequency conversion technology, the "phase hopping" AC-AC frequency conversion can regulate the output voltage and the output frequency at the same time. Relative to current frequency converters, it has the advantages of large capacity, high voltage level, and low cost. Taking a six-fold circuit as an example, all the voltage results are analyzed according to the voltage vector superposition method. Three groups of parameters are chosen as instances and performed a simulation with MATLAB in the condition of constant voltage to frequency ratio. Then an experimental platform is set up and the experimental analysis has been carried on. The experimental results are in good agreement with theory and simulation studies.