本文關鍵詞： 大功率LED 負載自適應 PFC LLC ZVS　出處：《武漢輕工大學》2015年碩士論文　論文類型：學位論文

【摘要】：本論文在分析大功率LED的工作原理與特性的基礎上,對大功率LED驅動電路的基本組成和工作原理進行了探討。在對不同類型驅動電路進行分析之后,提出了基于SSL4120T芯片的大功率LED驅動電路。該電路方案以SSL4120T為核心,其AC-DC級在升壓拓撲結構的基礎上,采用恒導通時間控制法、使電感電流工作在臨界導通模式(Critical-conduction Mode,簡稱CRM)來實現功率因數校正(Power Factor Correction,簡稱PFC)。DC-DC級選用半橋諧振變換器(Half-bridge LLC Resonant Converter,簡稱HBC或LLC)與同步整流,通過LLC諧振變換器,原邊功率管可以實現零電壓開關(Zero Voltage Switch,簡稱ZVS),副邊進行同步整流,以減小整流損耗提高系統(tǒng)的工作效率。該電路在課題研究期間開展的主要工作如下:(1)設計系統(tǒng)結構,選擇控制芯片;(2)對PFC技術進行研究與分析,選擇適合本項目的控制方法;(3)對LLC電路進行理論研究,建立FHA等效模型,設計諧振變壓器;(4)設計同步整流器;(5)制作驅動電源樣機,對其各項性能指標進行測試,驗證理論分析的正確性。
[Abstract]:On the basis of analyzing the working principle and characteristics of high-power LED, this paper discusses the basic composition and working principle of high-power LED drive circuit. A high power LED drive circuit based on SSL4120T chip is proposed. The core of the circuit is SSL4120T, the AC-DC level is based on the boost topology, and the method of constant on-time control is adopted. The inductance current works in critical conduction mode (CRM) to realize power factor correction (PFC) Factor correction. The half-bridge resonant converter Half-bridge LLC Resonant converter (HBC or LLCconverter for short) and synchronous rectifier are used in the PFC).DC-DC stage, and the LLC resonant converter is used. The primary side power transistor can realize zero voltage switch zero Voltage switch, the secondary side carries on the synchronous rectification, in order to reduce the rectifier loss to improve the system working efficiency. The main work of this circuit during the research period is as follows: 1) Design the system structure. Select control chip to study and analyze PFC technology, select the control method suitable for this project, do theoretical research on LLC circuit, set up FHA equivalent model, design resonant transformer, design synchronous rectifier, design synchronous rectifier and make a prototype of driving power supply. The performance indexes are tested to verify the correctness of the theoretical analysis.
【學位授予單位】：武漢輕工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN312.8;TM46

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本文編號：1496884