Investigation of active power factor correction circuits, and design and implementation of an interleaved power factor correction circuit

Nowadays, as a result of increasing use of semiconductors and power electronics devices, current harmonics? effects on the electrical systems have become intolerable. Therefore, it has become essential problem to reduce these harmonic currents, which effect negatively theenergy system quality, and shaping the current actively to achieve a good power factor.In this thesis power factor concept is explained, harmonics as a cause of low power factor and limitation of this harmonics with international standards are examined. Power factor correction methods are examined in the scope of the study. Easiest and widely used passive filters and nowadays ever increasing usage and importance of high frequency AC-DC converters are explained.The power stage of converter consists of the two?phase interleaved boost topology employing the average current mode control principle. main design goals are obtaining high input power factor, low input current distortion, and well regulated output dc voltage, and obtaining these attributes in a power converter with high power density. In order to obtain reduced line current ripple and EMI, reduced power component stresses, and improved power density has been chosen interliving topology. The control of the converter is provided by utilizing a commercial monolithic integrated circuit, which provides natural interleaving dual-phase transition mode power factor correction (PFC).xvFinally, an active AC/DC power converter has been designed and an interleaved power factor correction circuit has been realized and results have been analyzed.Key words: Power factor, power factor correction, harmonic standards, single stage power factor correction circuits, two phase interleaved boost power factor correction circuits