1、 毕业论文(设 计) 论文(设计)题目论文(设计)题目: : 大功率大功率 LEDLED 恒流开关电源的研制恒流开关电源的研制 English topic: Constant Current LED Switching Power Supply 系 别 物理与电子工程学院 专 业 自动化 学 号 学 生 指导教师 2012 年 5 月 25 日 大功率大功率 LEDLED 恒流开关电源的研制恒流开关电源的研制 摘要摘要:目前,电能的合理利用越来越成为节约能源的重要方面。LED 由于其节能、 高效、高稳定性、长寿命等特点,得到越来越广泛的应用。LED 本身的光学特性 对电流的敏感性高于电压。由于
2、 LED 的这些特点,一种与之匹配的高效、节能、 稳定的电源必不可少。 本文设计了一种市场需求量大的拥有多路输出的大功率LED恒流驱动开关电 源,它在输入电压和负载 LED 灯串电压(即个数)在一定范围内变化时,仍具有高 恒流精度和控制结构简单、成本低、体积小、效率高等特点。文章首先对大功率 照明 LED 的特性及其驱动电路的性能要求进行了介绍。 接着分析了恒流开关电源 作为 LED 驱动电源的可行性及优势所在,介绍了开关电源相关关键性技术, 确定 本设计采用反激式的括扑结构,驱动电路采用先恒压再恒流的两级驱动形式,控 制芯片使用 PI 公司的 TNY274 系列控制芯片。然后,论文对开关电源
3、各个功能 模块进行了设计并通过公式推导计算出最佳参数作为设计参考。 最后整合各功能 模块,设计出两级驱动 LED 总电路,绘制出整体电路 PCB 图,并对本次设计进 行了总结。 关键关键词:词:LED;恒流;开关电源;驱动电源;大功率 Constant Current LED Switching Power Supply Abstract:At present, the rational use of electricity has increasingly become an important aspect of energy conservation. LED to be more wi
4、dely used due to its energy saving, high efficiency, high stability, long life characteristics. Higher than the voltage of the current sensitivity of the optical properties of the LED itself. Because of these characteristics of the LED, a matching efficiency, energy saving, stable power supply is es
5、sential. Design a market demand of high-power LED constant current driver switching power supply with multiple outputs, and change within a certain range in the input voltage and load LED string voltage (ie, number), still has a high current precision and control structure is simple, low cost, small
6、 size and high efficiency. The article introduces the first high-power LED lighting characteristics and performance of the drive circuit requirements. Then analyzes the feasibility and advantages of the constant-current switching power supply as an LED driver power supply, switching power supply key technologies to determine the design of flyback including flutter structure using two of the first constant voltage constant current driv