數位控制升壓型功因校正轉換器之分析與設計

Analysis and Design of Digitally Controlled Boost PFC Converters

陳信助(Shin-Ju Chen) ； 楊松霈(Sung-Pei Yang) ； 鄭永昇(Yung-Sheng Cheng)

《崑山科技大學學報》 9期 (2012/06) Pp. 58-70

https://doi.org/10.29922/JKSUT.201206.0006

摘要

本文以升壓型轉換器為AC-DC功因校正整流器的基本架構，使用數位信號處理器dsPIC30F4011為控制核心，應用主動式功因校正技術的平均電流控制法，提高功率因數，減少輸入電流諧波，以符合國際電流諧波規範IEC 61000-3-2 Class D。平均電流控制法包含達到高功因性能的內迴路電流控制及穩壓性能的外迴路電壓控制。一般高功因轉換器的電壓迴路系統通常有低頻寬限制，以避免影響功因性能，所以輸出電壓對負載變動的響應較慢。本文額外加入負載電流注入法，改善負載變動的輸出電壓暫態響應。轉換器分析、系統建模與控制器設計均詳細探討，最後研製一組450 W數位控制升壓型功因校正轉換器，實驗結果驗證轉換器的高功因性能，同時在輸入電壓振幅變動及負載變動時，輸出電壓具有良好的穩壓性能。

關鍵字

升壓型功因校正轉換器 ； 平均電流控制法 ； 數位信號處理器 ； 負載電流注入法

並列摘要

Based on the digital signal processor dsPIC30F4011, an active power-factor-correction (PFC) boost converter with average current-mode control (ACC) technique is investigated in the paper. It would comply with the international harmonic current standards IEC 61000-3-2 Class D. The ACC-controlled boost PFC converter consists of two feedback loops. The inner current loop regulates the input current, so that its average value follows the rectified input voltage to achieve high power factor. The outer voltage loop maintains the rectifier output voltage at a reference level. The main limitation of ACC-controlled PFC rectifiers is that the bandwidth of the voltage control loop is lower in order not to reduce the performance of power factor. Therefore, the dynamic response of the output voltage to load variation is slow. A load-current-injection control technique is thus applied to remedy the drawback. The operating principle, system modeling and controller design are presented in detail. A 450 W prototype of the digital control boost PFC converter is implemented to validate the theoretical analysis. The experimental results are provided to verify the high power factor and the well output voltage regulation against the input voltage variation and load change.

並列關鍵字

boost power-factor-correction converter ； average current-mode control ； digital signal processor ； load-current-injection method