本文關(guān)鍵詞：基于峰值I~2C控制的Buck型LED驅(qū)動電源研究　出處：《西南交通大學》2017年碩士論文　論文類型：學位論文

  更多相關(guān)文章： LED 峰值電流控制 峰值I~2C控制 PI補償器 權(quán)重因子 穩(wěn)定性

【摘要】：發(fā)光二極管(Lighting Emitting Diode,LED)以其發(fā)光效率高、壽命長、色彩渲染效果好等優(yōu)點,廣泛應用到街道照明、車載照明、液晶顯示等工業(yè)產(chǎn)品中。由于LED的正向電流決定了它的亮度、使用壽命,為了得到恒定且精度高的正向電流,研究LED驅(qū)動電源的恒流控制技術(shù)具有重要意義。論文以Buck型LED驅(qū)動電源為研究對象,從傳統(tǒng)峰值電流型控制技術(shù)出發(fā),分析峰值電流控制Buck型LED驅(qū)動電源的工作原理,建立其精確的離散迭代映射模型,揭示了電路參數(shù)變化時驅(qū)動電源的動力學行為;推導了驅(qū)動電源的倍周期分岔邊界、電感電流連續(xù)導電模式(Continuous Conduction Mode,CCM)至斷續(xù)導電模式(Discontinuous Conduction Mode,DCM)的模式轉(zhuǎn)移邊界,并以此研究了 PI補償器電路參數(shù)變化對驅(qū)動電源穩(wěn)定性的影響,通過仿真與實驗驗證了理論結(jié)果的正確性。在峰值電流控制技術(shù)的基礎(chǔ)上,提出了適用于LED恒流驅(qū)動的峰值I~2C控制技術(shù),以及針對Buck型LED驅(qū)動電源通過控制外環(huán)采樣電感電流或是輸出電流的兩種實現(xiàn)方案;通過仿真分析了峰值I~2C控制Buck型LED驅(qū)動電源的穩(wěn)態(tài)性能和瞬態(tài)性能,并從時域角度理論分析了輸出電容等效串聯(lián)電阻(Equivalent Series Resistance,ESR)足夠大時驅(qū)動電源的穩(wěn)定性問題和斜坡補償條件。最后,構(gòu)建了峰值I~2C控制Buck型LED驅(qū)動電源的動力學模型,研究了輸出電容ESR和控制內(nèi)環(huán)電感電流權(quán)重因子對驅(qū)動電源動力學特性的影響,并推導了含斜坡補償?shù)尿?qū)動電源倍周期分岔邊界、CCM-DCM模式轉(zhuǎn)移邊界,并以此劃分了驅(qū)動電源的工作狀態(tài)區(qū)域分布。研究結(jié)果表明:電感電流權(quán)重因子、輸出電容ESR的減小會縮小驅(qū)動電源的穩(wěn)定工作范圍,引入斜坡補償可以使之拓寬,通過仿真與實驗驗證了理論分析的正確性和有效性。
[Abstract]:Light emitting diode (LED) is widely used in street lighting because of its high luminous efficiency, long life and good color rendering effect. Vehicle lighting, liquid crystal display and other industrial products. Because the forward current of LED determines its brightness, service life, in order to get constant and high precision forward current. It is of great significance to study the constant current control technology of LED drive power supply. This paper takes the Buck type LED driver as the research object and starts from the traditional peak current mode control technology. This paper analyzes the working principle of Buck type LED drive power supply controlled by peak current, establishes its precise discrete iterative mapping model, and reveals the dynamic behavior of driving power supply when the circuit parameters change. The boundary of period doubling bifurcation and continuous Conduction Mode of inductance current are derived. The mode transfer boundary from CCM) to discontinuous Conduction mode (DCM). The influence of Pi compensator circuit parameters on the stability of the driving power supply is studied. The correctness of the theoretical results is verified by simulation and experiments. Based on the peak-current control technology. In this paper, the peak I ~ 2C control technology suitable for LED constant current drive is put forward, and two schemes are proposed to control the inductance current or output current of the Buck type LED driver by controlling the outer loop sampling inductor current or output current. The steady-state and transient performance of Buck type LED driver with peak I ~ 2C control is analyzed by simulation. The equivalent Series Resistance of output capacitance is analyzed theoretically from the point of view of time domain. The stability of the power supply and the slope compensation condition are discussed when the power supply is large enough. Finally, the dynamic model of the Buck type LED driver with peak value is built. The influence of the output capacitance ESR and the current weight factor of the inner loop inductor on the dynamic characteristics of the driving power supply is studied, and the period doubling bifurcation boundary of the driving power supply with slope compensation is derived. The CCM-DCM mode transfer boundary is used to divide the working state distribution of the driving power supply. The results show that the inductance current weight factor. The reduction of output capacitance ESR will reduce the stable working range of the driving power supply, and the slope compensation can be extended. The correctness and validity of the theoretical analysis are verified by simulation and experiments.
【學位授予單位】：西南交通大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM46

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本文編號：1433584