This paper deals with the design and analysis of a single-phase buck-boost AC-DC converter with power factor correction and high frequency isolation based on flyback converter for both discontinuous and continuous conduction modes (DCM and CCM) of operation. A comparison of both modes of operation is presented for 1kW power rating, taking into consideration the steady state and dynamic behavior, power quality, control technique, device rating and converter size. It is observed that CCM is most suitable for higher power applications where it requires little complex control and sensing of additional variables.

Input current shaping has become an important characteristic in AC-DC power converters in order to meet international regulations governing the power quality. Many topologies have been introduced which present attractive solutions for AC-DC conversion and relieve from drawbacks of conventional method of diode rectification with bulk capacitor which causes low-order harmonics injection in to AC power supply and low power factor. It also results in an occurrence of high peak current, line voltage distortion, increased electromagnetic interference, extra burden on lines and additional losses. In the recent years, single stage AC-DC power converters such as flyback, Cuk, SEPIC and Zeta converters have been widely used for PFC, where the problems associated with the conventional techniques are well addressed .

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