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Simulation of Single-Phase Power Factor Correction using DSP
Keywords: Power factor correction, PI controller, DSP
Typical switching power supplies utilizes AC-DC converter stage to regulate the output voltage. A problem caused by this converter is that it draws pulsating current that contains significant amount of harmonics. High total harmonic distortion (THD) and therefore low power factor (PF) reduce the maximum power available and the efficiency of the electricity supply networks. To meet to IEC 61000-3-2 normative which defines the limits of the harmonics content of the input current for 220 AC power, the new design require active power factor correction (PFC) at the input. It would be ideal, if all electric devices supplied with an electric line performed as an “Emulating Resistor”. Analog PFC IC's are available from several manufacturers and have been able to provide quality input current. Analog control, however, require additional electric components, increasing system cost and complexity. Digital control via DSP negates the need for specific IC's, thus reducing system cost. In this paper, we propose the implementation of a simple digital control of a power factor using DSP and we describe the software solution, explaining how algorithm of control has been implemented. Analysis and design along with results are discussed.
S. Keraï , Teacher-Researcher
Université Abou Bakr Belkaîd; Faculté de Technologies
Tlemcen 13000,

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