Abstract— Trapezoidal modulation technique has been applied in
AC to AC converter to reduce harmonics in the output. Both step
up and step down operation of the converter has been studied for
different output frequencies. Simulation results are shown for
single-phase to single-phase converter configuration using the
software SIMULINK. Minimum total harmonic distortion in the
output has been found to be 5% for cyclo-inverter operation for a
frequency range of 500 to 750 Hz. During cyclo-converter
operation it reduces to 1.2% up to a frequency range of 1 Hz to
16.66 Hz which is generally recommended mode of cycloconverter.