LED路灯智能控制器的设计.doc

I 摘要 LED 具有很大的优势,例如:寿命非常的长,使用环保又节省能源。我国的现状是,人口密集,资源使用率低,人均能源不足,所以从长远发展来看,我们国家必须发展 LED 路灯照明。一般意义上的电源开关电路在输入交流电压经整流之后要经过电解电容滤波,之后提供给有智能控制功能的单片机。而LED 的亮度取决于通过本身的电流的大小,电流大小的控制又要通过控制 PWM 波的占空比来实现。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,满足了客户群体和国家技术指标的需求。本文的主要设计要求如下: 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 LED 故障检测电路,只要有城市路灯的一个 LED 灯坏掉,那时电路可以在一百五十毫秒内检测出这个故障,并且将电路的输出电流降到 LED 路灯安全允许程度,以保证其它 LED 灯工作在安全电流范围之内,保证 LED 路灯正常运行。 LED 亮度检测电路和温度检测电路,当单片机温度很高时可以将电流降到安全允许范围,同时可以同步检测 LED 的周围环境的亮度并且依据环境亮度智能调节 LED 路灯的发光亮度,这样即可以节省了我国的能源,解决资源匮乏问题,又可以延长路灯的使用寿命,节省人力物力的费用。关键词: LED 路灯,温度检测,亮度检测,开关控制,恒流控制 II ABSTRACT LED has a great advantage .For example, long service life, more environmentally friendly and energy-saving . The current situation ofour country, large population, shortage of resources, energy waste is serious . So from the point of long-term development, our country need to develop ment LED lighting The pulse high ponent, resulting in serious waste of power and power factor is low, but asa harmonic current source may interfere with the grid voltage, the propagation along the wire and into the surrounding radiation, ic 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 ofa flyback type LED street lamp with PFC function constant current driver circuit, replace the boost PFC converter and DC/DC converter in 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 li