具改善動態性能之高功因升壓型AC/DC轉換器研製：以FPGA為控制核心

Implementation of FPGA-Based Control for a Boost PFC Converter with Improved Dynamic Performance

翁瑞鴻(Ruei-Hong Wong)

指導教授 ： 陳信助

共同指導教授 ： 楊松霈(Sung-Pei Yang)

崑山科技大學/工程學院/電機工程研究所/碩士(2012年)

摘要

本文以FPGA數位控制為核心，利用主動式功因校正技術之平均電流控制法並加入負載電流注入法，實現具改善動態性能之高功因升壓型AC/DC轉換器。
平均電流控制法之高功因升壓型轉換器包含內迴路電流控制與外迴路電壓控制，其中內迴路控制為了使轉換器的平均輸入電流追隨輸入電壓波形，達到高功因性能，減少輸入電流諧波，符合國際電流諧波規範；外迴路電壓控制為了使轉換器的輸出電壓不受輸入電壓與負載變動的影響，達到輸出穩壓性能。由於電壓控制迴路的頻寬一般只有10~20 Hz，因此，本文再加入負載電流注入法的技術，改善轉換器在負載變動時輸出電壓的動態響應，達到快速穩壓的效果。
在實作中，利用FPGA開發板DE2-70為數位控制發展平台，採用Verilog硬體描述語言，撰寫平均電流控制法及負載電流注入法之程式，研製一組交流輸入電壓90~130 V，直流輸出電壓312 V，最大輸出功率400 W的高功因升壓型AC/DC轉換器。由實驗結果驗證轉換器具有高功因性能，符合電流諧波規範IEC61000-3-2 Class D，且在輸入電壓變動和負載變動下，都具有良好的輸出穩壓性能。

關鍵字

FPGA ； 升壓型轉換器 ； 功因校正 ； 負載電流注入法

並列摘要

An FPGA-based digital control boost power-factor-correction (PFC) converter with average current-mode control (ACC) and load-current-injection control is implemented to achieve high power factor and to improve dynamic performance.
The ACC controlled boost PFC converter includes a fast inner current loop and a slow outer voltage loop. The current loop regulates the input current such that input average curren follows the rectified imput voltage to comply with the current standards on power factor and input current distortion of power supplies. The outer voltage loop maintains the rectifier output voltage at a reference level against load variation and line voltage fluctuation. The main limitation of the ACC controlled PFC rectifiers is that the bandwidth of the voltage loop is only about 10-20 Hz. The technique of load-current-injection control is applied to speed up the output voltage response to load variation.
The FPGA-based digital control is implemented by the kit DE2-70 based on the ALTERA Cyclone II EP2C896C6N. The hardware description language of Verilog is used to program the control algorithm. A prototype of 400 W boost PFC converter with 90~130 Vrms in the ac input and 312 V in the dc output has been built to validate the performance of the control technique. The experimental results are provided to verify the high power factor complying with IEC61000-3-2 Class D and the well output voltage regulation against the input voltage variation and load change.

並列關鍵字

FPGA ； boost converter ； power factor correction ； load current injection.

參考文獻

[44] 曾昭雄，數位控制式功因修正器之研製，碩士論文，國立虎尾科技大學飛機工程學系，2009。

[45] 鄭永昇，類比及數位控制之升壓型功率因數校正整流器研製，碩士論文，崑山科技大學電機工程系，2010。

[1] F. Zhang, J. Xu, “A Novel PCCM Boost PFC Converter with Fast Dynamic Response, ” IEEE Trans. Industral Electronics, Vol. 58, No. 9, pp. 4207-4216, 2011.

[2] H. S. Athab, D. D.-C. Lu, “ A High-Efficiency AC/DC Converter with Quasi-Active Power Factor Correction, ” IEEE Trans. Power Electronics, Vol. 25, No. 5, pp. 1103-1109, 2010.

[3] K. I. Hwu, H. W. Chen, Y. T. Yau, “ Fully Digitalized Implementation of PFC Rectifier in CCM without ADC,” IEEE Trans. Power Electronics, Vol. 27, No. 9, pp. 4021-4029, 2012.