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Cycloconverter control circuitry is discussed using examples from a practical three-phase to single-phase circulating current free cycloconverter. The voltage biased cosine wave technique is used for phase control. Phase-forward and phase-back limit (PBL) pulses are superimposed on each cosine wave. Spurious gating pulses in the range 180? to 360? are suppressed. A new current zero detector is presented...