DCM Boost PFC變換器變占空比控制的數(shù)字實(shí)現(xiàn)方法
 

宋俊超
（南京理工大學(xué) 自動(dòng)化學(xué)院，江蘇 南京 210094）
 

    摘 要：分析了變占空比控制的基本原理，推導(dǎo)出該控制算法的占空比表達(dá)式，并提出了一種具有恒功率功能的變占空比控制的數(shù)字實(shí)現(xiàn)方法?；跀?shù)字信號(hào)處理器MC56F8257對(duì)80 W DCM Boost PFC變換器進(jìn)行了實(shí)驗(yàn)驗(yàn)證。實(shí)驗(yàn)結(jié)果表明，數(shù)字變占空比控制可以在較寬的輸入電壓范圍內(nèi)實(shí)現(xiàn)接近于1 的功率因數(shù)，輸入電流基本無(wú)畸變。
    關(guān)鍵詞：功率因數(shù)校正(PFC)；斷續(xù)模式(DCM)；變占空比控制；數(shù)字實(shí)現(xiàn)
    中圖分類號(hào)：TM46     文獻(xiàn)標(biāo)識(shí)碼：A     文章編號(hào)：1007-3175(2017)04-0031-04
 

Digital Realization Method of Variable Duty Ratio Control for Discontinuous

Current Mode Boost Power Factor Correction Converters

 

SONG Jun-chao
（School of Automation, Nanjing University of Science and Technology, Nanjing 210094, China）
 

    Abstract: This paper analyzed the basic principle of variable duty ratio control, derived the expression of duty ratio of this control algorithm and proposed a kind of variable duty ratio control digital implementation method with constant power functions. The experimental verification of discontinuous current mode (DCM) Boost power factor correction (PFC) 80 W converter was carried out based on the digital signal processor MC56F8257. The experimental results show that the digital variable duty ratio control can achieve a power factor close to 1 in a wide range of input voltages and the input current is almost no distortion.
    Key words: power factor correction; discontinuous current mode; variable duty ratio control; digital realization
 

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