【正文】 rent situation of our country, large population, shortage of resources, energy waste is serious. So from the point of longterm development, our country need to development LED lighting The pulse high harmonic ponent, resulting in serious waste of power and power factor is low, but as a harmonic current source may interfere with the grid voltage, the propagation along the wire and into the surrounding radiation, electromagic interference. The brightness of the LED depends on the size of the current through itself. For these problems, this paper designed a high efficiency new type LED street lamp intelligent controller, can meet the design requirements. In this paper, the main design requirement is as follows:For these problems, this paper designed a high efficiency new type LED street lamp intelligent controller, can meet the design this paper, the main design requirement is as follows: 1. The design of a flyback type LED street lamp with PFC function constant current driver circuit, replace the boost PFC converter and DC/DC converter in the position of the secondary circuit, which simplifies the circuit structure, improve the use efficiency of LED 2. An LED fault detection circuit design, as long as there is any LED lights to fail, then the circuit can be detected in one hundred and fifty milliseconds and to allow output current levels, ensure the safety of other LED lights work in the current scope, ensure the normal operation of the LED street lamp, prolong its service life. 3. Design an LED brightness detection circuit and temperature detection circuit, when the temperature of the chip is very high to allow current range, at the same time can be a basis of synchronous detection LED brightness and brightness automatically adjust the output brightness of LED lights, which can save energy, and can extend the service life and save money. Keywords: LED street lamp, the temperature detection, brightness detection, switch control, constant current control 5 目 錄 摘 要 ........................................................................................................................ III ABSTRACT ............................................................................................................. IV 第 1 章 LED路燈概述 ........................................................................................... 6 LED 路燈的發(fā)展前景 ...................................................................................... 6 LED 驅(qū)動(dòng)電源特點(diǎn)及介紹 .............................................................................. 6 單片機(jī) ............................................................................................................. 7 第 2 章 LED 驅(qū)動(dòng)電源原理 ................................................................................. 9 電源控制技術(shù)的發(fā)展方向 ............................................................................. 9 開關(guān)電源的分類 .............................................................................................. 9 調(diào)制式（ PWM）開關(guān)電源的原理 .................................................................. 10 PFC 控制芯片 L6562..................................................................................... 12 反饋環(huán)路設(shè)計(jì)原理 ....................................................................................... 13 第 3 章 硬件電路 的設(shè)計(jì) ..................................................................................... 15 系統(tǒng)總方案的設(shè)計(jì) ........................................................................................ 15 EMI 抑制電路和浪涌保護(hù)的設(shè)計(jì) ................................................................ 16 溫度檢測(cè)電路的設(shè)計(jì) ................................................................................... 17 亮度檢測(cè)電路 ................................................................................................ 17 萬(wàn)年歷芯片和外圍電路 ................................................................................ 18 LED 故障檢測(cè)電路 ........................................................................................ 16 電流控制電路 ............................................................................................... 17 第 4 章 軟件設(shè)計(jì) ................................................................................................ 21 系統(tǒng)軟件設(shè)計(jì) ............................................................................................... 21 亮度檢測(cè)軟件設(shè)計(jì) ....................................................................................... 22 溫度控制軟件設(shè)計(jì) ........................................................................................ 23 故障檢測(cè)軟件設(shè)計(jì) ........................................................................................ 24 結(jié) 論 ........................................................................................................................ 25 參考文獻(xiàn) ................................................................................................................... 28 致 謝 ........................................................................................................................ 29 6 第 1章 LED 路燈概述 LED 路燈的發(fā)展前景 LED 是一個(gè)非常實(shí)用的新產(chǎn)品，現(xiàn)在是科學(xué)家聚焦的一個(gè)熱點(diǎn)。下面我們來(lái)說(shuō)說(shuō) LED 路燈。 LED 光源不能匆匆應(yīng)用到路燈照明有幾個(gè)因素：第一個(gè)就是 LED 發(fā) 展還不久發(fā)展還不是很成熟。第三個(gè)就是 LED 還沒有一個(gè)比較完善的智能控制電路，可靠性太低。第五就是 LED 還沒有一個(gè)國(guó)際統(tǒng)一的標(biāo)準(zhǔn)，各個(gè)公司的產(chǎn)品不能進(jìn)行相互之間的調(diào)換，維修比較困難，成本比較高。第三就是對(duì)于大功率 LED 燈的宣傳一定要謹(jǐn)慎，不能過(guò)于夸張，我 們要把我們的能量集中在 LED路燈系統(tǒng)的研發(fā)工作上面。 LED 路燈有幾個(gè)關(guān)鍵的技術(shù)指標(biāo)，分別是效率、光型、光衰、壽命。第二就是一些部門的思維太過(guò)于固執(zhí)，還缺乏一些關(guān)于 LED 了燈的配套的措施與政策，大家對(duì)于 LED 的認(rèn)識(shí)有一個(gè)漸漸的過(guò)程，這其中包括一些科學(xué)家的認(rèn)識(shí)也是經(jīng)歷從無(wú)到有的過(guò)程。當(dāng)然這需要我們對(duì)于科研孜孜不倦的追求。它的性能主要有以下幾個(gè)方面： 第一， 高性能的驅(qū)動(dòng)電源就會(huì)給整個(gè) LED 帶來(lái)很高的效率，而效率的提高 能夠節(jié)省我們國(guó)家的能源，這正是我們國(guó)家急需解決的問題。 第三， 因?yàn)轵?qū)動(dòng)電源的性能比較好，靈敏度非常高，所以能夠 改變 LED 燈的工作方式，使它滿足各種照明的需求，所以可以根據(jù)環(huán)境的不同、時(shí)間的不 7 同，實(shí)時(shí)的改變驅(qū)動(dòng)電源燈電流輸出。 LED 元件對(duì)驅(qū)動(dòng)電源的技術(shù)要求非常的嚴(yán)格。在國(guó)際的市場(chǎng)上對(duì)于 LED的驅(qū)動(dòng)電源的轉(zhuǎn)化效率，有效功率，電源的使用壽命，恒流的精度，電磁兼容性的要求也是非常高的。這時(shí)應(yīng)為電源在整個(gè) LED 路燈智能控制系統(tǒng)中相當(dāng)與人們的心臟。因此目前我們主要面臨如下幾個(gè)挑戰(zhàn)： 第一個(gè)就是驅(qū)動(dòng)電源的使用壽命。 LED 燈和一般二級(jí)管有很大的不同就是它們的溫度特性不同。大功率 LED 燈的工作電流非常大，并且 LED 燈的發(fā)光效率還比較低。所以 LED 燈的發(fā)熱很高，如果散熱器的