發(fā)布時(shí)間：2019-04-13 15:26

【摘要】：LED(LIGHTEMITTINGDIODE)發(fā)光二極管,作為新一代電光源,具有環(huán)保、安全、節(jié)能、和超過50000小時(shí)的長壽命等特點(diǎn)。然而,在實(shí)際應(yīng)用中,LED電光源的壽命、穩(wěn)定性和能量效率通常會(huì)被相適配的LED驅(qū)動(dòng)器所限制。為了將交流電轉(zhuǎn)換成像大多數(shù)直流電壓源一樣的低壓直流電供應(yīng)給LED負(fù)載,通常會(huì)采用大電解電容來緩沖變化的輸入功率�？墒�,電解電容的壽命只有短短的幾千小時(shí),而且在高溫條件下,壽命還會(huì)大大減少。這就導(dǎo)致了 LED發(fā)光二極管和LED驅(qū)動(dòng)器的壽命不匹配,從而影響了 LED電光源的壽命。本課題研究的目的就是通過減少LED驅(qū)動(dòng)器中所需的電容值,將電路中的電解電容用其他長壽命的電容來代替,從而延長AC/DC的LED驅(qū)動(dòng)器的壽命。本文提出了兩種方案來去除LED驅(qū)動(dòng)器中的電解電容。第一種方案是在電路的輸入端加入電容串并聯(lián)結(jié)構(gòu)的填谷電路,填谷電路不僅可以起到緩沖輸入輸出功率的作用,同時(shí)可以對橋式整流后的電壓進(jìn)行降壓,減少器件受到電壓應(yīng)力,提高電路的穩(wěn)定性,延長電路的壽命。第二種方案則是引入的新型的控制策略,將輸出的脈沖電流的峰均比降低,再利用較小的電容和電感并聯(lián)結(jié)構(gòu)對輸出的脈沖電流進(jìn)行整流,從而實(shí)現(xiàn)去電解電容的目的。本文詳細(xì)推導(dǎo)了兩種方案中電路的各個(gè)關(guān)鍵節(jié)點(diǎn)的電壓電流關(guān)系,相關(guān)的電容值,以及新結(jié)構(gòu)和新的控制策略的輸出的效率,輸出功率等關(guān)鍵指標(biāo)�；谏鲜龅膬煞N方案,分別設(shè)計(jì)和制作15W和18W的兩臺原型機(jī),并進(jìn)行了實(shí)驗(yàn)驗(yàn)證,樣機(jī)在效率、功率因數(shù)和電路體積上都有很好的表現(xiàn)。
[Abstract]:LED (LIGHTEMITTINGDIODE) light emitting diode, as a new generation electric light source, has the characteristics of environmental protection, safety, energy saving, and long life over 50000 hours. However, in practical applications, the life, stability and energy efficiency of LED electric light source are usually limited by the appropriate LED driver. In order to convert AC current into low voltage DC supply to LED like most DC voltage sources, large electrolytic capacitors are usually used to buffer the variable input power. However, the life of electrolytic capacitors is only a few thousand hours, and the life of electrolytic capacitors will be greatly reduced under high temperature conditions. This leads to the mismatch between the life of the LED and the LED driver, which affects the life of the LED light source. The purpose of this study is to prolong the life of AC/DC LED driver by reducing the capacitance required in the LED driver and replacing the electrolytic capacitance with other long-lived capacitors. In this paper, two schemes are proposed to remove the electrolytic capacitance from the LED driver. The first scheme is to add a capacitive series-parallel circuit to the input of the circuit, which can not only buffer the input and output power, but also reduce the voltage after bridge rectifier. Reduce the voltage stress of the device, improve the stability of the circuit, prolong the life of the circuit. The second scheme is to introduce a new control strategy, which reduces the peak-to-average ratio of the output pulse current, and then rectifies the output pulse current by using the smaller capacitance and inductor parallel structure, so as to achieve the goal of de-electrolytic capacitance. In this paper, the voltage-current relationship of the key nodes in the two schemes, the relative capacitance values, the output efficiency and output power of the new structure and the new control strategy are derived in detail. Based on the above two schemes, two prototype machines (15W and 18W) are designed and fabricated, and the experimental results show that the prototype has a good performance in efficiency, power factor and circuit volume.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN312.8

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