Improvements in phase-controlled circulating-current cycloconverter using communication principles

The paper demonstrates the application of communication techniques to improve the phase-controlle circulating-current cycloconverter. A modification to the existing cosinusoidal firing method is proposed which employs regular sampling instead of natural sampling. It is shown that this modification leads to a reduction in the magnitude of certain (low-frequency) harmonics that exist in the output waveform of the conventional cycloconverter. It is concluded that this may lead to an extension of the useful frequency range of the cycloconverter.