LED燈設(shè)計(jì)


摘要：LED燈是近年來快速興起的一種新穎光源, 它的很多良好特點(diǎn)使得它的應(yīng)用面越來越廣。LED 的單向?qū)щ娞匦允乖S多人認(rèn)為理應(yīng)用直流驅(qū)動(dòng), 但是對(duì)直流穩(wěn)壓和限流的裝置在保證比較好的限流特性時(shí), 自身功耗是很大的, 所以使系統(tǒng)的效率大為降低。只有用較高頻率的交流來驅(qū)動(dòng)LED,并且用在呈現(xiàn)較大阻抗時(shí)自身功耗較小的電感或電容來限流, 才能把LED 驅(qū)動(dòng)電路的限流特性和自身功耗都做得比較理想。
本文所設(shè)計(jì)的智能調(diào)光LED 臺(tái)燈系統(tǒng)，它采用的是單片機(jī)為控制核心，運(yùn)用恒流驅(qū)動(dòng)方案與PWM調(diào)光技術(shù)實(shí)現(xiàn)LED臺(tái)燈的多級(jí)調(diào)光控制。適合于現(xiàn)代家庭的實(shí)際需要?？梢灶A(yù)見，隨著LED 照明技術(shù)的不斷發(fā)展完善，節(jié)能高效的LED將在家用照明領(lǐng)域發(fā)揮著日益重要的作用。
關(guān)鍵詞：驅(qū)動(dòng)電路；LED；智能調(diào)光

Abstract: in recent years, the rapid rise of the LED lamp is a novel light source, its many good characteristics make it more extensive application. LED one-way electrical properties that many people think that the physical application of DC drive, but on the DC voltage and current limiting device to ensure better current limiting characteristics, its power consumption is large, so the efficiency of the system is greatly reduced. Only with high frequency AC to drive LED, and used in a larger impedance when its power consumption smaller inductance or capacitance current limiting, can the LED driver circuit for current limiting characteristics and their own power to do quite ideal.
In this paper, the intelligent dimming LED lamp system using AT89S51MCU as the control core, the use of constant current driving scheme and PWM dimming technology to realize the L ED lamp multistage dimming control. Suitable for the actual demands of modern families. Can foreknow, with the LED lighting technology and continuously improve the development, energy saving and high efficiency in the field of household lighting LED will play an increasingly important role in.
Key words:  driving circuit; LED; intelligent dimming
 

目 錄

中文摘要及關(guān)鍵詞 I
英文摘要及關(guān)鍵詞 II
正文 1
第一章 緒論 1
一、研究背景 1
二、研究意義 1
第二章  LED特性、驅(qū)動(dòng)要求及調(diào)光方式 2
一、LED的優(yōu)勢(shì) 2
二、LED的特性 3
三、LED的驅(qū)動(dòng)要求 4
第三章 電源轉(zhuǎn)換模塊 7
一、電源轉(zhuǎn)換模塊介紹 7
二、電源轉(zhuǎn)換模塊工作原理 8
三、主要參數(shù)設(shè)計(jì) 10
四、無源PFC 11
第四章 LED的PWM驅(qū)動(dòng)電路設(shè)計(jì) 12
一、PWM信號(hào)的原理和形成 12
二、PWM驅(qū)動(dòng)白光LED 13
第五章 智能調(diào)光模塊 15
一、系統(tǒng)主程序 15
二、按鍵檢測(cè)和處理程序 16
三、鬧鐘中斷程序 17
四、電路設(shè)計(jì)部分 19
參考文獻(xiàn) 21