白光LED照明电源研究

范文编号:WLX123  字数:9306,页数:19

摘    要
 近几年，大功率白光LED（Light Emitting Diode）技术得到了很大的发展。LED作为一种固体光源，具有节能、环保、结构牢固、寿命长、启动时间短、体积小、低压驱动等优点，应用前景十分巨大。
 使用LED照明系统需要一个AC/DC转换器。在过去，一般使用分立器件搭建AC/DC转换器作为电源，使用市电交流电给电源供电。由于在AC/DC电路和电流控制电路的损耗，这种LED照明系统相比于传统白炽灯和荧光灯并没有优势。随着半导体制造技术发展和高压BCD工艺成熟，出现了能耐500V的高压金属氧化物半导体场效应管(MOSFET)，使得设计制造高压集成电路成为了可能。
 本文我们采用一款支持交流85V-265V输入的恒流控制芯片，设计了一种体积小、效率高、性能稳定、价格便宜的PWM (Pulse Width Modulation) 开关电源，用以恒流驱动大功率白光LED。实测电源效率高达90%。由于芯片内部已有过温保护、输出短路保护和输出开路保护的设计，所以此款设计的电路安全性高，非常适合应用于系统效率要求高、安全性要求高的实际照明中。

关键词：白光LED、开关电源、恒流驱动

Abstract
 In recent years, high-power white LED (Light Emitting Diode) technology has been greatly developed. LED is a kind of solid light source. It has an enormous application prospect because of its advantages , such as energy conservation, environmental protection, firm structure, long life, short start-up time, small volume, low operating voltage.
 The LED lighting system needs an AC/DC converter. In the past, the general use of AC / DC converter was made by separate devices as a power source, and using mains alternating current to power supply. As the loss of AC / DC circuit and current control circuit, resulting that it has no advantage of LED lighting compared to traditional incandescents and fluorescent lamps.
As semiconductor manufacturing technology development and high-voltage BCD process maturity, there 500V high-voltage capability of metal oxide semiconductor field effect transistor(MOSFET), making design and manufacture of high-voltage integrated circuits as possible.
In this paper, we adopt a 85V-265V AC input to support the constant current control chip, and design a small size, high efficiency, stable, inexpensive PWM (Pulse Width Modulation) switching power supply for high-power white LED constant current driver .The measured power efficiency up to 90%. As the chip has been over-temperature protection, output short circuit protection and output open-circuit protection design, so this design of the circuit is very safe and suitable for systems that require high efficiency, high safety requirements in the actual lighting.

Keywords: White LED , switching power supply , constant current drive

目录
中文摘要 i
英文摘要 ii
目录 iii
一、绪论 1
1.1  白光LED特性 1
1.2  开关电源原理结构 2
1.2.1 开关电源基本原理 2
1.2.2 开关电源组成 2
1.3  开关电源分类 2
1.3.1按驱动方式分类 2
1.3.2 按电路结构方式分类 3
1.3.3按控制原理分类 3
1.4  LED驱动芯片的发展 4
二、电路设计原理 6
2.1  恒流控制芯片介绍 6
2.2  典型电路应用及改进 6
2.3  电路分析 7
三、硬件电路制作 9
3.1  驱动电路制作 9
3.2  白光LED光源制作 9
四、应用测试与性能分析 10
4.1  电源效率测试 10
4.2  输出恒流测试 10
4.3  光源表面温度测试 11
4.4  光效测试 11
五、总结与展望 13
5.1  总结 13
5.2  展望 13
致谢 14
参考文献： 15

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