Buck-Boost and Ĉuk topology based single phase cycloconverters with low THD and high power factor

Two topologies of single phase cycloconverters based on Buck-Boost and Ĉuk topologies are presented. Instead of simple switching scheme of P and N controlled rectifier-converters, high frequency switching of uncontrolled rectifiers outputs have been used with the help of Buck-boost and Ĉuk converters. The input supply is an AC source followed by a full bridge rectifier circuit, the output of which is fed to the SMPS converters. The output voltages of the proposed cycloconverters are controllable step-up and step down in nature with duty cycle control of switching regulators. Total Harmonic Distortion (THD) of the input current of the proposed circuits is minimized by input filters before the rectifier. Input power factor and efficiency of the circuits are high. The circuits exhibit such performances at variable switching frequencies and duty cycles.