Design and Implementation of a DSC-Based Controller for Power Factor Correction Stage

• Main Authors: Chi-Yu Liou, 劉啟宇
• Other Authors: Wan-Rone Liou
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/47602241610060694807

碩士 === 國立臺北大學 === 電機工程研究所 === 98 === This thesis focuses on the study of digitally programmable control concepts, design and implementation of a low power for power factor correction circuit. It used an 110VAC mains voltage as input, then step-down input voltage to the PFC converter by the autotransformer. The output voltage is 20V, and the output current range between 0.2A and 1.2A. Digital Signal Controller as the system control core by using Microchip dsPIC33FJ16GS502. Power system combines software and hardware, which have to write power factor correction control algorithm, then setting the system operates at average current mode. In operating at CCM mod, the input current can achieve low harmonic distortion, low ripple output voltage and high efficiency. Finally, the experimental result shows the efficiency is 85%, total harmonic distortion is 15.1%, power factor is 0.9887 and the ripple output voltage is 210mV. A DSC-Based fully digital control of PFC can achieve programmable, fewer components and greater flexibility design. The circuit can be realized through scaling input voltage, inductor current, and output voltage by ADC module. Then compensates and obtains the error signal by comparing the set reference voltage in the digital PI compensation. The signal will send to the DAC to its end, limit to do the steps and control the duty signal for PWM with a complete cycle of the control loop. Finally, the desired output regulation and current in-phase with voltage waveform are achieved. Behavioral simulation of the power factor correction stage is verified by using Matlab/Simulink software and full model of PFC is obtained by reference waveform parameters adjustment and compensation.