本文選題：LED驅(qū)動電源 + 可調(diào)光��； 參考：《陜西科技大學(xué)》2014年碩士論文

【摘要】：新一代的綠色節(jié)能LED照明，憑借著其節(jié)能環(huán)保、長壽命、數(shù)字調(diào)控方便等優(yōu)勢已經(jīng)成為全球化的趨勢。作為LED照明光源不可或缺的關(guān)鍵組件——LED驅(qū)動電源，它在燈具中的作用就好比像人的心臟一樣無比關(guān)鍵與重要，電源品質(zhì)制約著LED產(chǎn)品的可靠性與其商業(yè)化應(yīng)用。本文對功率因數(shù)校正技術(shù)、調(diào)光控制方式、反激式變換器、電磁兼容問題等關(guān)鍵模塊進行分析研究，設(shè)計了一款輸出為40V/350mA可調(diào)光的隔離式LED驅(qū)動電源。其主要工作與結(jié)果如下： （1）功率因數(shù)校正技術(shù)的研究。本文選擇兩級結(jié)構(gòu)，前級AC/DC采用升壓變換器實現(xiàn)功率因數(shù)校正，后級DC/DC級采用反激變換器工作于臨界模式實現(xiàn)恒流驅(qū)動，功率因數(shù)達到0.93以上。 （2）調(diào)光中閃爍問題的解決。針對調(diào)光過程中存在的閃爍問題，設(shè)計無源泄放電路電路。LED出現(xiàn)閃爍的主要原因有：在TRIAC導(dǎo)通的瞬間會產(chǎn)生一個大的尖峰電流，引起電路振蕩，在電路中加入阻尼電路，抑制該尖峰電流；在調(diào)光器導(dǎo)通過程中，需要有一個維持電流IH維持其導(dǎo)通，否則電流低于IH時，調(diào)光器關(guān)斷，如此反復(fù)，使調(diào)光器誤觸發(fā)引起LED閃爍。因此，設(shè)計無源泄放電路，避免調(diào)光器誤觸發(fā)，實現(xiàn)平穩(wěn)調(diào)光，范圍在1%~100%。 （3）控制電路的研究。對電路的控制方式以及驅(qū)動電源控制策略進行研究分析，選擇原邊恒流控制的方式，并利用數(shù)字控制芯片，實現(xiàn)電路的恒流輸出。采用原邊恒流控制的方案，去除了副邊光耦控制，減少反饋回路，使電路結(jié)構(gòu)更加簡化。結(jié)果表明電流實現(xiàn)恒流輸出，，且電流的變化范圍小于5%。 （4）EMI濾波電路的設(shè)計。針對LED驅(qū)動電路中的電磁兼容問題，分析了電磁兼容產(chǎn)生的原因，根據(jù)電磁干擾的三要素提出電磁干擾的抑制措施。設(shè)計EMI濾波電路，有效地抑制傳導(dǎo)干擾。 本文實現(xiàn)了低成本可調(diào)光的LED調(diào)光電源。本電源的性能指標(biāo)如下：該電源的調(diào)光范圍可達1%~100%，實現(xiàn)無閃爍平穩(wěn)調(diào)光；且在無調(diào)光模式下，功率因數(shù)可達0.93以上，效率在0.80以上，恒流范圍小于5%，具有較好的實用性能與應(yīng)用前景。
[Abstract]:The new generation of green energy-saving LED lighting has become a global trend with its advantages of energy saving and environmental protection, long life, convenient digital control and so on. As an indispensable key component of LED lighting source, LED-driven power supply plays an important role in lamps and lanterns just like the human heart. The quality of power supply restricts the reliability and commercial application of LED products. In this paper, the key modules such as power factor correction technology, dimming control mode, flyback converter and EMC are analyzed and studied. An isolated LED driver with output of 40V/350mA dimming light is designed. Its main work and results are as follows: Research on Power Factor Correction (PFC). In this paper, the two-stage structure is chosen. The former stage AC/DC adopts boost converter to realize power factor correction, the latter stage uses flyback converter to work in critical mode to realize constant current drive, and the power factor is above 0.93. (2) the solution of the flicker problem in dimming. Aiming at the flicker problem in the dimming process, the main reasons for the design of the passive discharge circuit circuit. The main reasons are as follows: a large peak current will be produced at the moment of TRIAC conduction, which will cause the circuit to oscillate, and a damping circuit will be added to the circuit. In the process of the dimmer conduction, it is necessary to have a maintenance current IH to maintain its conduction. Otherwise, when the current is lower than IH, the dimmer is turned off and repeated so that the dimmer may mistrigger and cause LED scintillation. Therefore, the passive discharge circuit is designed to avoid the misfiring of dimmer and to realize smooth dimming, which ranges from 1 to 100. Research on control circuit. The control mode of the circuit and the control strategy of the driving power supply are studied and analyzed. The original side constant current control mode is selected and the constant current output of the circuit is realized by using the digital control chip. The primary edge constant current control scheme is adopted to eliminate the secondary edge optical coupling control and reduce the feedback loop, which makes the circuit structure more simplified. The results show that the current output is constant current, and the current range is less than 5. Design of EMI filter circuit. Aiming at the problem of EMC in LED driving circuit, the causes of EMC are analyzed, and the measures to restrain EMI are put forward according to the three elements of EMI. EMI filter circuit is designed to suppress conduction interference effectively. In this paper, a low cost tunable LED dimming power supply is realized. The performance indexes of the power supply are as follows: the dimming range of the power supply can reach 1 / 100, and the power factor can reach above 0.93 and the efficiency is more than 0.80 in the non-flashing and stable dimming mode. The constant-current range is less than 5, so it has good practical performance and application prospect.
【學(xué)位授予單位】：陜西科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM923.34;TM46

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