高性能LED驱动与控制系统研发

发布时间：2018-01-01 04:32

本文关键词：高性能LED驱动与控制系统研发　出处：《天津工业大学》2016年硕士论文　论文类型：学位论文

更多相关文章： LED驱动 PWM调光 功率因数校正 PT4107

【摘要】：随着社会经济的发展,能源问题成为社会关注的焦点。LED作为节约型社会的产物,在照明行业发挥着其不可代替的优势。LED具有高效、节能、环保、寿命长、不易损坏等优点。对于LED特殊的低压直流驱动方式,必须设计合适的驱动电源。开关电源具有高效、体积小等优点,是LED驱动电源的首选。在LED照明中加入调光充分印了能源节约的主题。本文设计的调光驱动系统主要为LED吸顶灯提供照明方案。为了实现吸顶灯好的调光效果,经过对三种调光方式进行比较,最后选取PWM调光方式。根据调光方案与输出参数的要求,本文分别对控制电路与驱动电路两部分进行设计。控制电路部分完成输出占空比可调的PWM信号；驱动电源部分完成减小电磁干扰、功率因数校正,降压恒流等功能。控制电路以STC12C5620单片机为核心,结合红外遥控技术,通过软件编程实现PWM信号的阶梯性变化,从而平滑的调节输出电流。驱动电源以PT4107为主芯片,将接收到的PWM信号转化为对MOSFET的通断控制,改变输出电流的平均电流值。驱动电源可以通过采样电阻对输出电流进行采样,并与芯片内部基准电压进行对比,从而调节PWM控制,使电流更平稳。经过最终调试与测试,系统性能满足最初设计要求,能够实现0%-100%的无极调光。驱动电源工作稳定,完成性能指标,达到产品电源体积要求,为接下来的研发奠定了基础。
[Abstract]:With the development of social economy, energy problem has become the focus of social attention. Led, as a result of energy-saving society, plays an irreplaceable advantage in lighting industry. Led has the advantages of high efficiency, energy saving and environmental protection. For the special low-voltage DC drive mode of LED, the suitable driving power must be designed. The switching power supply has the advantages of high efficiency and small size. The dimming drive system designed in this paper mainly provides the lighting scheme for the LED ceiling lamp. In order to realize the good ceiling light absorption, the dimming drive system is the first choice of the LED driving power supply. Dimming effect. After the comparison of three dimming modes, the PWM dimming mode is selected finally, according to the dimming scheme and output parameters requirements. In this paper, the control circuit and the drive circuit are designed respectively. The control circuit completes the output of the PWM signal with adjustable duty cycle. The driving power supply part completes the functions of reducing electromagnetic interference, power factor correction, lowering voltage and constant current, etc. The control circuit is based on STC12C5620 single chip microcomputer, combined with infrared remote control technology. The step change of PWM signal can be realized by software programming, and the output current can be adjusted smoothly. PT4107 is the main driver. The received PWM signal is converted to the on-off control of the MOSFET, and the average current value of the output current is changed. The driving power can sample the output current through the sampling resistor. And compared with the internal reference voltage of the chip to adjust the PWM control, make the current more stable. After the final debugging and testing, the system performance meets the initial design requirements. It can realize 0-100% dimmer. The driving power supply works stably, achieves the performance index, meets the requirement of power supply volume, and lays the foundation for the following research and development.
【学位授予单位】：天津工业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TM923.34

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