（2014届）
本科毕业设计（论文）资料
湖南工业大学教务处
2014届
本科毕业设计（论文）资料第一部分毕业论文
本科毕业设计（论文）
2014年5月
摘要
LED具有很大的优势，例如：寿命长，比较环保又很节能。我国的现状是，人口多，资源短缺，能源浪费严重，所以从长远发展来看，我国急需发展LED照明。
一般意义上的电源开关电路在输入市电整流之后要经过容量比较大的电解电容滤波提供给控制开关的芯片。这就使得输入电流是一个尖脉冲。这个脉冲含有很高的谐波分量，造成电量的严重浪费和功率因素很低，而且作为一个谐波电流源会干扰电网电压，产生沿导线传播和向周围辐射的电磁干扰。LED的亮度取决于通过本身的电流的大小。对于以上这些问题，，本文设计了一款高效新型LED 路灯智能控制器，满足了设计要求。本文的主要设计要求如下：
1.设计一种带PFC功能的反激式LED路灯恒流驱动电路，取代由PFC升压变换器和DC/DC变换器构成的二级电路，这样简化了电路结构、提高了LED的使用效率
2.设计一个LED故障检测电路，只要有任何一个LED灯坏掉，那时电路可以在一百五十毫秒内检测出来并且将输出电流降到允许程度，保证其它LED灯工作在安全电流范围之内，保证LED路灯正常运行，延长其使用寿命。
3.设计一个LED亮度检测电路和温度检测电路，当芯片温度很高时将电流降到允许范围，同时可以同步检测LED的亮度并依据亮度自动调节LED路灯的输出亮度，这样即可以节省能源，又可以延长使用寿命，节省开支。
关键词：LED路灯，温度检测，亮度检测，开关控制，恒流控制
ABSTRACT
LED has a great advantage .For example, long service life, more environmentally friendly and energy-saving.The current situation of our country, large population, shortage of resources, energy waste is serious. So from the point of long-term development, be badly in need of the development of LED lighting in China.
The pulse high harmonic component, 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, electromagnetic 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 requirements.In 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 composition 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
