Investigation of power factor correction on single phase AC/DC converters

Abstract Traditional AC to DC converters converts AC source voltage to DC output voltage with poor power factor and efficiency. AC to DC converters can be found in most industries for supplying power to an electric load and the importance of having a high input power factor and efficiency has become more and more essential. Therefore, this project was created and the main objective is to design a new AC to DC converter which can effectively increase power factor and efficiency. In this project design, Buck Boost DC to DC conversion technique was applied to improve a power factor. During the software simulations, firstly simulate the normal full wave bridge rectifier and analyses the current and voltage waveform from the simulation results. Then calculate total harmonic distortion and the power factor of this normal AC to DC converter. After that, learned the different kind of DC to DC conversion techniques and design the new AC to DC converter together with Buck Boost DC to DC converter. To obtain the variable dc output voltage, the duty ratio of the transistor switch was controlled by constructing small switching control circuit. After analyses the simulation results of the newly constructed AC to DC converter, power factor is greatly improved as compared with the normal AC to DC converter. Therefore this design is very useful for industries which need AC to DC converters in their real application.Bachelor of Engineerin