【摘要】：近年來,各國研究學者一直致力于新型照明光源的開發(fā)與設(shè)計。高亮度發(fā)光二極管以其高效、節(jié)能環(huán)保、長壽命,高可靠性等諸多優(yōu)點,被公認為21世紀最有價值的"綠色"光源。針對驅(qū)動電源與光源壽命不匹配的問題,本文經(jīng)過對多種消除電解電容的策略進行分析,將優(yōu)化電路拓撲結(jié)構(gòu)為主要方向,分析研究無電解電容LED驅(qū)動電源的電路拓撲結(jié)構(gòu)。本文致力于設(shè)計一種低頻脈動電流LED驅(qū)動電路,不需要任何電解電容或復雜的控制電路去減小低頻輸出紋波。這個電路使用單開關(guān)拓撲結(jié)構(gòu)從而簡化了控制器的設(shè)計,能夠?qū)δ茈娙轀p小到微法級,所以薄膜電容可以被用來取代電解電容。LED驅(qū)動電源是一個功率變換器,將輸入交流電壓變換為穩(wěn)定的直流電壓,供給LED光源。由于LED驅(qū)動電源的輸入功率是脈動的,為了保證輸出功率是恒定的,因此需要大容量的儲能電容來平衡瞬時輸入功率和輸出功率間的能量波動,儲能電容一般選用大容量的電解電容。而電解電容的壽命只有幾千小時,遠遠短于LED的壽命(50,000小時),這使得LED驅(qū)動電源與LED的長壽命不匹配。為了延長電源的使用壽命,必須減小甚至去除電源中的電解電容,或者使用其他類型的電容替代電解電容。本文研究源于兩級聯(lián)DCM反激式轉(zhuǎn)換器的概念,設(shè)計了一個新型的無電解電容電路。詳細論述了電路的工作原理、開關(guān)狀態(tài)、參數(shù)選擇和控制電路設(shè)計。并利用MATLAB仿真進行驗證。高效率、低成本、高功率因數(shù)和長壽命的驅(qū)動電源是保證LED光源發(fā)光品質(zhì)和整體性能的關(guān)鍵。本文分析了輸入功率因數(shù)、輸入功率脈動與所需要的儲能電容容量之間的關(guān)系,在此基礎(chǔ)上提出了一種三次諧波注入的控制方法,即在變換器的輸入電流中注入三次諧波,在保證輸出電壓紋波不變、輸入功率因數(shù)不低于0.9的條件下將儲能電容容量減小為改進電路中的65.6%,體積減小了近20%,并在一臺60WBoostPFC變換器的原理樣機上進行驗證,最后得出實驗結(jié)果。通過將仿真和實驗的兩個結(jié)果進行對比,驗證了理論分析的正確性和可行性,表明該電路具有較強的實用性和優(yōu)越性。通過實驗數(shù)據(jù)分析,此款無電解電容的設(shè)計方案具有高功率因數(shù)、高效率、高可靠性等特點;同時滿足節(jié)能環(huán)保的要求和EMC測試標準。
[Abstract]:In recent years, researchers all over the world have been committed to the development and design of new lighting sources. High brightness LED is recognized as the most valuable "green" light source in the 21st century because of its advantages of high efficiency, energy saving, environmental protection, long life, high reliability and so on. Aiming at the mismatch between the driving power supply and the light source, this paper analyzes various strategies to eliminate the electrolytic capacitance, and takes the optimization of the circuit topology as the main direction to analyze and study the circuit topology of the LED drive power supply without electrolytic capacitance. This paper is devoted to the design of a low frequency pulsating current LED drive circuit without any electrolytic capacitance or complex control circuit to reduce the low frequency output ripple. The circuit uses a single-switch topology to simplify the design of the controller, reducing the energy storage capacity to a micronormal level, so the thin film capacitor can be used to replace the electrolytic capacitor. The LED drive power supply is a power converter. The input AC voltage is converted to a stable DC voltage to supply the LED light source. Since the input power of the LED drive power supply is pulsating, in order to ensure the output power is constant, a large capacity energy storage capacitor is needed to balance the energy fluctuation between the instantaneous input power and the output power. Energy storage capacitors are generally large-capacity electrolytic capacitors. However, the lifetime of electrolytic capacitor is only several thousand hours, which is much shorter than that of LED (50000 hours), which makes the LED drive power supply mismatch the long life of LED. In order to prolong the service life of the power supply, the electrolytic capacitance in the power supply must be reduced or even removed, or other types of capacitors should be used to replace the electrolytic capacitance. In this paper, the concept of two-cascade DCM flyback converter is studied, and a novel electrolytic capacitor circuit is designed. The working principle, switch state, parameter selection and control circuit design of the circuit are discussed in detail. And use MATLAB simulation to verify. High efficiency, low cost, high power factor and long life driving power supply are the key to ensure the luminous quality and overall performance of LED light source. In this paper, the relationship between input power factor, input power pulsation and the capacity of energy storage capacitor is analyzed. Based on this, a control method of third harmonic injection is proposed, that is, the third harmonic is injected into the input current of the converter. Under the condition that the output voltage ripple is constant and the input power factor is not lower than 0.9, the capacity of the energy storage capacitor is reduced to 65.6 in the improved circuit, and the volume is reduced by nearly 20 percent, which is verified on the principle prototype of a 60WBoostPFC converter. Finally, the experimental results are obtained. The correctness and feasibility of the theoretical analysis are verified by comparing the two results of simulation and experiment, and it is shown that the circuit has strong practicability and superiority. Through the analysis of experimental data, the design scheme of non-electrolytic capacitance has the characteristics of high power factor, high efficiency and high reliability, and meets the requirements of energy saving and environmental protection and EMC test standard.
【學位授予單位】：天津工業(yè)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：2188674