本文選題：LED　切入點：功率因數(shù)　出處：《西安電子科技大學》2015年碩士論文　論文類型：學位論文

【摘要】：當前全球經(jīng)濟的發(fā)展面臨著越來越突出的資源短缺和環(huán)境污染問題,并由此導致的全球能源和環(huán)保的壓力也越來越大。在此背景下,伴隨著“綠色照明工程”的積極推進以及世界各國的節(jié)能環(huán)保意識逐步增強,LED照明技術(shù)被引入照明應用領域并已經(jīng)成為當前照明市場和產(chǎn)業(yè)發(fā)展環(huán)境的主流趨勢。LED(Lighting Emitting Diode)是發(fā)光二級管的簡稱。由于LED照明具有使用壽命長、發(fā)光效率高、綠色環(huán)保、體積小、抗沖擊性能好以及便于靈活控制等優(yōu)點,使其被廣泛應用在建筑物外觀及景觀照明、交通信號燈及LCD顯示屏、車輛指示類照明及植物照明等各個領域。目前,盡管各國對LED照明產(chǎn)業(yè)發(fā)展的政策引導作用不斷加強使LED照明產(chǎn)業(yè)發(fā)展環(huán)境樂觀,市場潛力巨大,但技術(shù)問題及成本仍是阻礙LED照明技術(shù)普及的最大的兩個問題。然而在LED驅(qū)動電源中,功率因數(shù)低、電磁兼容超標和效率低則是其比較棘手的三個問題。因此,研究LED驅(qū)動電源中的功率因數(shù)技術(shù)將為LED照明市場的蓬勃發(fā)展提供重要的理論依據(jù)。功率因數(shù)校正技術(shù)(PFC)旨在提高電路的功率因數(shù)。該技術(shù)不僅能降低電網(wǎng)中的無功功率,還能減少諧波污染,提高電網(wǎng)的供電質(zhì)量。因此如何抑制和消除諧波對公共電網(wǎng)的污染,提高功率因數(shù)已成為當今國內(nèi)外電源界研究的主要課題。綜觀PFC技術(shù)的發(fā)展,PFC技術(shù)可分為兩大類:一類是無源功率因數(shù)校正也稱PPFC或稱被動式PFC技術(shù),另一類則是有源功率因數(shù)校正也稱APFC或稱主動式PFC技術(shù)。而目前最為大家所關(guān)注的APFC電路主要分為兩級APFC電路和單級APFC電路。本文在參閱國內(nèi)外大量有關(guān)LED驅(qū)動電源功率因數(shù)技術(shù)文獻的基礎上,首先對國內(nèi)外功率因數(shù)技術(shù)的發(fā)展現(xiàn)狀以及無源功率因數(shù)校正技術(shù)和有源功率因數(shù)校正技術(shù)的優(yōu)缺點進行簡析,其次對LED照明技術(shù)和開關(guān)電源技術(shù)做簡要介紹,緊接著對單級APFC技術(shù)和兩級APFC技術(shù)做簡單的比較,最后通過單級APFC電路對有源功率因數(shù)校正技術(shù)進行深入研究。本文通過采用工作在原邊反饋模式下的單級APFC恒流控制芯片MP4021設計的50W單端Flyback開關(guān)電源來對單級APFC技術(shù)進行詳細介紹,并對單級APFC的紋波大的缺點設計控制電路以保證良好的紋波特性。論文同時對該電源中的各個參數(shù)進行詳細設計,并對變壓器、開關(guān)管和輸出整流二極管的損耗進行估算,然后對開關(guān)電源中電磁兼容做簡要的分析。
[Abstract]:The current development of the global economy is facing more and more prominent problems of resource shortage and environmental pollution, and the resulting pressure on global energy and environmental protection is also increasing. With the active promotion of "Green Lighting Project" and the awareness of energy saving and environmental protection in the world, LED lighting technology has been introduced into lighting application field and has become the mainstream trend of lighting market and industrial development environment. LEDX Lighting Emitting Diode is the abbreviation of LEDs. Because of the long service life of LED lighting, The advantages of high luminous efficiency, environmental protection, small size, good impact resistance and flexible control make it widely used in building appearance and landscape lighting, traffic signal light and LCD display screen. At present, although the policy guidance role of various countries to the development of LED lighting industry has been strengthened, the environment of LED lighting industry is optimistic, and the market potential is huge. However, in LED driving power supply, low power factor, high EMC and low efficiency are the three thorny problems. The study of the power factor technology in the LED driving power supply will provide an important theoretical basis for the vigorous development of the LED lighting market. The power factor correction technology is designed to improve the power factor of the circuit. This technology can not only reduce the reactive power in the power grid, but also improve the power factor of the circuit. It can also reduce harmonic pollution and improve the quality of power supply. Improving power factor has become the main research topic in the field of power supply at home and abroad. The development of PFC technology can be divided into two categories: one is passive power factor correction, also known as PPFC or passive PFC technology, and the other is passive power factor correction (PFC), which is also called passive power factor correction (PFC). The other is active Power Factor Correction (APFC), or active PFC technology, and the most concerned APFC circuits are mainly composed of two-stage APFC circuits and single-stage APFC circuits. In this paper, we refer to a large number of domestic and foreign related LED drives. Based on the technical literature of power factor, Firstly, the development status of power factor technology at home and abroad and the advantages and disadvantages of passive power factor correction technology and active power factor correction technology are briefly analyzed. Secondly, the LED lighting technology and switching power supply technology are briefly introduced. Then, a simple comparison between single-stage APFC technology and two-level APFC technology is made. Finally, the active power factor correction (APFC) technology is deeply studied by single-stage APFC circuit. In this paper, a 50W single-terminal Flyback switching power supply based on single-stage APFC constant-current control chip MP4021, which works in the original side feedback mode, is used to design a single-stage APFC. Technology is introduced in detail, In order to ensure good ripple characteristics, the control circuit is designed to guarantee the good ripple characteristics of single-stage APFC. At the same time, the parameters of the power supply are designed in detail, and the losses of transformer, switch and output rectifier diode are estimated. Then the electromagnetic compatibility in switching power supply is analyzed briefly.
【學位授予單位】：西安電子科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN312.8

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