張國龍+鄭琛瑤
摘 要: 為了使開關電源具有體積小、智能化等特點,提出采用DSP數字處理技術和模糊PID控制相結合,設計完成了具有響應快、效率高的智能開關電源。通過與外圍EMI濾波電路、光電隔離、保護電路等配合,解決了開關電源對電網的污染,保護開關電源因溫度等不確定因素對開關電源造成的損壞。本開關電源控制算法先進,設計合理,具有較強的工程應用參考價值。
關鍵字: 開關電源; 模糊PID控制; DSP; 電源控制算法
中圖分類號: TN79?34 文獻標識碼: A 文章編號: 1004?373X(2014)21?0149?03
Design and control algorithm of switching power supply with DSP digital control
ZHANG Guo?long, ZHENG Chen?yao
(Detachment 93, Unit 91388 of PLA, Zhanjiang 524022, China)
Abstract: A technology of DSP digital processing combined with fuzzy PID control is proposed in this paper, and ?an intelligent switching power with fast response and high efficiency was designed to make the switching power supply be small, intelligent, etc. Through the cooperation of the external EMI filtering circuit, optical isolation and protection circuit, the power grid pollution caused by switching power supply was solved, this switching power supply which may be damaged by temperature and other uncertain factors was protected. This control algorithm of switching power supply is advanced, its design is reasonable and it has strong reference value for engineering application.
Keywords: switching power supply; fuzzy PID control; DSP; power supply control algorithm
近年來,隨著電力電子技術高速發展,開關電源得到廣泛應用,普通模擬開關電源逐漸顯示出其不足之處:采用模擬器件會導致元器件比較多,分散性大,穩定性差;設計缺乏靈活性,不便于修改,調試不方便,控制不靈活,無法實現復雜的控制算法。為設計出更精確、響應速度更快、效率更高、體積更小的開關電源,開關電源設計人員采用數字化電路與開關電源相結合來設計數字化開關電源。以DSP系統為基礎的開關電源電路簡單,結構緊湊,性能卓越,功能齊全。DSP系統具有較高的計算與控制能力,利用DSP進行A/D轉換后進行運算,可以有效抑制或消除各個功能模塊間相互干擾,提高開關電源輸出電壓的穩定性和精度。本文將重點分析和討論利用DSP系統設計開關電源的實現方法和控制算法。
1 基于DSP控制的實現方法
DSP系統已廣泛應用于開關電源控制電路,是開關電源的控制核心電路,可以有效利用DSP系統的高速性、可編程性、可靠性等特點,結合相應算法實現特定功能,可為開關電源輸出質量好、頻率和幅值可以任意改變的控制信號。……