大功率可调光LED驱动设计

发布时间：2018-05-30 01:42

本文选题：LED驱动 + PWM调光　；参考：《杭州电子科技大学》2015年硕士论文

【摘要】：随着日益紧张的能源危机的来临,传统石化能源的枯竭,可持续发展和绿色环保的发展方式受到越来越多的关注。在这样的背景下,LED以其所具有的高光效、低功耗、寿命长等优点的“绿色照明”飞速发展,并成为既白炽灯、钠灯和荧光灯之后的第四代照明系统。同时随着半导体技术的发展,大功率LED已广泛用于在各类照明场所,LED的调光控制技术随之也在迅速发展。因此,设计出高效率、高性能的LED驱动对LED产业的发展有着重要的意义。本文就LED照明的发展背景和课题的研究意义做了详细的分析,同时对LED驱动电源中设计的技术做了深入的理论分析,包括驱动器的常见拓扑结构以及影响LED驱动电路的主要技术参数、整流电路、抗电磁干扰技术、钳位保护电路以及光耦反馈电路、功率校准技术、降压恒流源技术以及LED调光技术。根据这些理论基础,设计了一款基于UC3844、HV9910芯片的可进行PWM调光的50W LED恒流驱动电路。其中驱动电源的功率因素校准功能通过单级反激式PFC电路来实现,进而实现了LED恒流源的电流输出,并且通过PIC单片机对LED的调光功能进行控制,并对其中涉及的问题提出了合理而有效的解决方法。
[Abstract]:With the advent of the increasingly tense energy crisis, more and more attention has been paid to the depletion of traditional fossil energy, sustainable development and the development of green environmental protection. Under this background, LED has developed rapidly with its advantages of high light efficiency, low power consumption, long life and so on, and has become the fourth generation lighting system after incandescent lamp, sodium lamp and fluorescent lamp. At the same time, with the development of semiconductor technology, the dimming control technology of high-power LED has been widely used in various lighting places. Therefore, the design of high-efficiency, high-performance LED driver is of great significance to the development of LED industry. In this paper, the development background and research significance of LED lighting are analyzed in detail. At the same time, the design technology of LED driving power supply is analyzed in detail. Including the common topology of the driver and the main technical parameters affecting the LED drive circuit, rectifier circuit, anti-electromagnetic interference technology, clamp protection circuit and optocoupler feedback circuit, power calibration technology, Depressurized and constant-current source technology and LED dimming technology. On the basis of these theories, a 50W LED constant current drive circuit based on UC3844NV HV9910 chip is designed for PWM dimming. The power factor calibration function of driving power supply is realized by single-stage flyback PFC circuit, and the current output of LED constant-current source is realized, and the dimming function of LED is controlled by PIC singlechip. A reasonable and effective solution to the problems involved is put forward.
【学位授予单位】：杭州电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM923.34

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