University of Isfahan Computational Intelligence in Electrical Engineering 2821-0689 10 3 2019 09 23 Buck-Forward-Flyback Power Factor Correction Converter with Low Total Harmonic Distortion Buck-Forward-Flyback Power Factor Correction Converter with Low Total Harmonic Distortion 1 10 24044 10.22108/isee.2019.115425.1187 FA Masoud Ghazali PhD Candidate, Isfahan University of Technology, Isfahan, Iran Ehsan Adib Associate Professor, Isfahan University of Technology, Isfahan, Iran Journal Article 2019 02 02 In this paper, a new single-stage power factor correction (PFC) converter is presented. In the input stage of this structure, a buck converter is used to correct the power factor. So, the voltage stress of bulk capacitor reduced, and one of the main problems in the single stage PFC converters is solved. Moreover, by employing a compensator circuit, the input current dead angle which is the main drawback of the existing buck type PFCs is obviated, thus the total harmonic distortion is very low. In converters with buck PFC, input current dead angle results in high THD. In the proposed converter, using an inductor coupled with the main transformer, this problem is solved. A part of input power is transmitted directly to the output that helps to improve efficiency. The proposed converter is analyzed and the validity of the proposed solution is proven in the form of theoretical analysis, simulation and practical results. In this paper, a new single-stage power factor correction (PFC) converter is presented. In the input stage of this structure, a buck converter is used to correct the power factor. So, the voltage stress of bulk capacitor reduced, and one of the main problems in the single stage PFC converters is solved. Moreover, by employing a compensator circuit, the input current dead angle which is the main drawback of the existing buck type PFCs is obviated, thus the total harmonic distortion is very low. In converters with buck PFC, input current dead angle results in high THD. In the proposed converter, using an inductor coupled with the main transformer, this problem is solved. A part of input power is transmitted directly to the output that helps to improve efficiency. The proposed converter is analyzed and the validity of the proposed solution is proven in the form of theoretical analysis, simulation and practical results. https://isee.ui.ac.ir/article_24044_a9f6b01fd6b566638a60de3298df6c8b.pdf