Thyristor-based "phase hopping" frequency conversion technique
This study proposes a new AC/AC "phase hopping"
frequency conversion method based on the analyses of the disadvantages of
the conventional cosine wave-crossing method. The advantages of this new
method include no circulating current, no dead time, and an output frequency
close to the power frequency. This study also introduces the basic
principles of the "phase hopping" method and analyzes these principles
combined with the voltage phase-changing comparison to that of the cosine
wave-crossing method. The "phase hopping" principles are used to analyze
the generation of thyristor trigger pulses, including the generation time
and duration. A simulation is conducted in MATLAB, and the simulation output
waveform and harmonic analysis results are then obtained. The proposed
approach is verified on an experimental platform. Consequently, the results
are in good agreement with those of the theoretical and simulation analyses.
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