本文選題：LED驅(qū)動器 + 功率因數(shù)校正��； 參考：《燕山大學(xué)》2015年碩士論文

【摘要】：發(fā)光二極管(Light Emitting Diode),簡稱LED,與傳統(tǒng)的光源相比具有很大的優(yōu)勢:不僅壽命長,還可以大幅度降低照明用電量,被稱為當(dāng)今2l世紀(jì)的綠色環(huán)保照明光源。LED驅(qū)動器的實質(zhì)是把輸入交流電壓轉(zhuǎn)換為穩(wěn)定的直流電壓,產(chǎn)生恒定電流來驅(qū)動LED工作。為了提高LED驅(qū)動器的壽命和可靠性,必須去除其中的儲能電解電容。本文的研究內(nèi)容即為一種兩級式諧振型無電解電容LED驅(qū)動電源。兩級式LED驅(qū)動器由前級功率因數(shù)校正(Power Factor Correction,PFC)變換器和后級DC-DC變換器級聯(lián)而成:PFC變換器可以將輸入交流電壓變換為直流電壓,而后級變換器主要是把該直流電壓變換為一個恒定的電流,來驅(qū)動LED。本文采用Boost PFC變換器作為前級,分析PFC變換器的輸入功率脈動與輸入功率因數(shù)之間的關(guān)系,計算電解電容容量與輸出電壓脈動的關(guān)系。比較了各種去除電解電容的方案,最終確定采用注入諧波的方式,在保證功率因數(shù)不小于0.9的前提下,減小電解電容容值并用薄膜電容進(jìn)行替代。文中,前級Boost PFC變換器工作在電感電流臨界連續(xù)模式,實現(xiàn)高的功率因數(shù)的同時,而且還可以實現(xiàn)開關(guān)管的零電流開關(guān),避免了升壓二極管的反向恢復(fù)問題。后級采用半橋LLC諧振變換器,該變換器不僅可以實現(xiàn)開關(guān)管和整流二極管的軟開關(guān),還具有較高效率。本文詳細(xì)分析該驅(qū)動電源的工作原理,討論該方案相應(yīng)的控制策略,并給出主電路及控制電路參數(shù)設(shè)計。最后制作完成一臺140W諧振型無電解電容LED驅(qū)動器的原理樣機,并進(jìn)行了仿真實驗驗證。實驗結(jié)果表明本文所提出的方案是可行的。
[Abstract]:Light Emitting Diode, or LED, has a great advantage over conventional light sources: it not only has a long life span, but also greatly reduces the power consumption of lighting. The essence of the green lighting source. Led driver is to convert the input AC voltage into a stable DC voltage and generate a constant current to drive the LED operation. In order to improve the life and reliability of LED driver, the electrolytic capacitance of energy storage must be removed. The research content of this paper is a two-stage resonant LED drive power supply without electrolytic capacitance. The two-stage LED driver is cascaded by the former power factor correction (PFC) converter and the latter DC-DC converter to form a LED converter, which can convert the input AC voltage to DC voltage. The latter converter mainly converts the DC voltage to a constant current to drive the LED. In this paper, the Boost PFC converter is used as the front stage to analyze the relationship between the input power pulsation and the input power factor of the PFC converter, and the relationship between the electrolytic capacitance capacity and the output voltage pulsation is calculated. The methods of removing electrolytic capacitance were compared and the method of injecting harmonics was determined. Under the premise of ensuring power factor not less than 0.9, the capacitance of electrolytic capacitor was reduced and replaced by thin film capacitance. In this paper, the former Boost PFC converter works in the critical continuous mode of inductance current, which can achieve high power factor, and can also realize the zero current switch of the switch tube, thus avoiding the reverse recovery problem of the booster diode. The half-bridge LLC resonant converter is adopted in the rear stage. The converter can not only realize the soft switching of switch and rectifier diode, but also have high efficiency. In this paper, the working principle of the drive power supply is analyzed in detail, the corresponding control strategy of the scheme is discussed, and the design of the main circuit and the control circuit parameters are given. Finally, a 140W resonant LED driver without electrolytic capacitance is fabricated and verified by simulation. The experimental results show that the proposed scheme is feasible.
【學(xué)位授予單位】：燕山大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TM46;TM923.34

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本文編號：1838934