The controller design with on-line scheme for an active boost power-factor-correction (PFC) converter is proposed to comply with the international harmonic current standards. The average current-mode control (ACC) is used for the PFC boost converter. The ACC-controlled boost converter includes a fast inner current loop and a slow outer voltage loop. The current loop regulates the input current such that input average current follows the input voltage waveform to achieve high power factor. The outer voltage loop maintains the output voltage at a reference level against load variation and line voltage fluctuation. To optimize the control systems, a hybrid particle swarm optimization (HPSO) algorithm is used to determine the optimal controllers for both of the inner and outer loops. A 450 W converter prototype is built to validate the effectiveness of the approach. The experimental results show the proposed controllers can provide better performance in load regulation and line regulation than the conventional controller design.
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