基于电流采样LED驱动芯片TRIAC调光技术的研究与设计
发布时间：2018-10-18 15:30
【摘要】：在全球能源危机日益凸显的背景下,发光二极管(LED)照明以其高效节能、绿色环保的绝对优势已经发展成为了当前最具潜力的照明方式之一。LED的普遍使用也推动了其驱动电源的开发和研究,如何提高驱动电源的安全性和驱动性能是当前这一领域的研究重点。调光技术的应用不仅可以提高我们的视觉效果,改善生活质量,而且可以进一步的节约能源,延长LED的使用寿命。目前市场上采用TRIAC调光的日光灯和白炽灯占大多数,因此只有设计出能够兼容TRIAC调光的LED驱动器才可以节省成本并迅速占领市场。本文基于电流采样技术,设计了一款具有调光功能的LED驱动芯片。该芯片具有高的功率因数,可实现TRIAC调光器对输出电流的精确控制。芯片内部的整个反馈环路是由数字电路实现,减小了由于工艺偏差而导致的误差。采用先进的电流采样技术,实现了对输入线电压的监测,减少了芯片的引脚数量,节约面积和成本。基于TRIAC切角测量技术,设计出一个频率可调的时钟振荡电路,其频率是跟随输入线电压频率的变化而变化的,两者之间满足一个定量关系,从而获得了无闪烁的恒流输出控制。巧妙的设计了导通时间延长电路,用来增强过零检测的准确度,过零比较器采用低功耗设计,减少了芯片的耗电。芯片的应用范围广泛,AC输入线电压在85 V~265 V,频率在47 Hz~63 Hz范围内变化时,均能正常的工作。论文对芯片内部的核心模块:电流采样电路、过零检测及过流检测电路、导通时间延长电路、切角测量模块进行了详细的分析和仿真验证。最后使用台积电公司的0.5μm BCD工艺库,利用Hspice软件在25℃下,对芯片整体及其拓扑结构进行了仿真,仿真结果表明本文所设计的基于电流采样,带可控硅调光,恒流输出的LED驱动芯片能够很好的符合各项指标要求,即使在线网电压存在波动时,也不会出现闪烁的问题。
[Abstract]:Under the background of the global energy crisis, LED (LED) lighting is highly efficient and energy saving. The absolute advantage of green environmental protection has developed into one of the most potential lighting methods at present. The widespread use of LED has also promoted the development and research of its driving power supply. How to improve the safety and performance of power supply is the focus of this field. The application of dimming technology can not only improve our visual effect, improve the quality of life, but also further save energy, prolong the service life of LED. At present, the majority of fluorescent and incandescent lamps use TRIAC dimming in the market, so only by designing a LED driver that can be compatible with TRIAC dimming can it save costs and quickly occupy the market. Based on current sampling technology, a LED driver chip with dimming function is designed in this paper. The chip has high power factor and can accurately control the output current of TRIAC dimmer. The whole feedback loop in the chip is realized by the digital circuit, which reduces the error caused by the process deviation. Using advanced current sampling technology, the input line voltage is monitored, the number of pins is reduced, and the area and cost are saved. A clock oscillating circuit with adjustable frequency is designed based on the TRIAC tangent measurement technique. The frequency of the circuit changes with the change of the input line voltage frequency, and the relationship between them satisfies a quantitative relationship, thus the constant current output control without scintillation is obtained. The on-time circuit is designed to enhance the accuracy of zero-crossing detection. The zero-crossing comparator is designed with low power consumption, which reduces the power consumption of the chip. The chip has a wide range of applications. When the input voltage of AC is 85 V / 265V and the frequency varies from 47 Hz~63 Hz to 47 Hz~63 Hz, it can work normally. In this paper, the core modules of the chip, such as current sampling circuit, zero-crossing detection and current crossing detection circuit, on-time prolonging circuit, cutting angle measurement module, are analyzed and simulated in detail. Finally, using the 0.5 渭 m BCD process library of TSMC and using Hspice software at 25 鈩，
本文编号：2279552
[Abstract]:Under the background of the global energy crisis, LED (LED) lighting is highly efficient and energy saving. The absolute advantage of green environmental protection has developed into one of the most potential lighting methods at present. The widespread use of LED has also promoted the development and research of its driving power supply. How to improve the safety and performance of power supply is the focus of this field. The application of dimming technology can not only improve our visual effect, improve the quality of life, but also further save energy, prolong the service life of LED. At present, the majority of fluorescent and incandescent lamps use TRIAC dimming in the market, so only by designing a LED driver that can be compatible with TRIAC dimming can it save costs and quickly occupy the market. Based on current sampling technology, a LED driver chip with dimming function is designed in this paper. The chip has high power factor and can accurately control the output current of TRIAC dimmer. The whole feedback loop in the chip is realized by the digital circuit, which reduces the error caused by the process deviation. Using advanced current sampling technology, the input line voltage is monitored, the number of pins is reduced, and the area and cost are saved. A clock oscillating circuit with adjustable frequency is designed based on the TRIAC tangent measurement technique. The frequency of the circuit changes with the change of the input line voltage frequency, and the relationship between them satisfies a quantitative relationship, thus the constant current output control without scintillation is obtained. The on-time circuit is designed to enhance the accuracy of zero-crossing detection. The zero-crossing comparator is designed with low power consumption, which reduces the power consumption of the chip. The chip has a wide range of applications. When the input voltage of AC is 85 V / 265V and the frequency varies from 47 Hz~63 Hz to 47 Hz~63 Hz, it can work normally. In this paper, the core modules of the chip, such as current sampling circuit, zero-crossing detection and current crossing detection circuit, on-time prolonging circuit, cutting angle measurement module, are analyzed and simulated in detail. Finally, using the 0.5 渭 m BCD process library of TSMC and using Hspice software at 25 鈩，
本文编号：2279552
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