LED驱动芯片可控硅调光电路研究与设计

发布时间：2018-05-28 13:36

本文选题：可控硅调光 + LED驱动　；参考：《电子科技大学》2014年硕士论文

【摘要】：被称为第四代照明技术的LED发明是人类照明史上一次历史性飞跃,是人类解决能源短缺和过度消耗的重要途径之一。LED已经广泛用于各种电子设备的照明系统,特别是手机、pad等小型设备。LED产业的快速发展也加速了调光产业的进步。调光技术不仅可以进一步节约能源,延长LED的使用年限,而且能够提高视觉效果,改善生活质量。可控硅调光自60年代开始出现,在近半个世纪以来一直主宰着整个照明调光领域。其以高兼容性,低成本,小体积,操作简便等优点深得消费者青睐。本文以可控硅调光为研究对象,设计了一款LED驱动芯片的调光相关电路。分析和对比了目前国内外比较流行的调光技术及其各自的优缺点,并重点分析了可控硅调光技术,最终确定采用可控硅调光为本芯片的调光方案。为了解决可控硅调光时出现的闪烁现象,本文设计了泄放通路和有源阻尼网络。为了实现光亮度可控,设计了相位控制电路,通过测量可控硅切相角大小以及将其转化为控制LED的平均电流的量。芯片的输入电压范围宽,可实现自供电。采用降压型反激式变换器作为本设计的LED驱动芯片外围拓扑;新颖的控制算法实现精确恒流,省去了复杂的控制环路补偿,减小了外部元件的使用,提高了效率。本文对设计的LED驱动器中几个关键模块进行了详细的分析和功能验证。其中包括供电电路,带隙基准电压源,过零检测,相位测量等模块。采用TSMC 0.5um BCD工艺,利用cadence、hspice软件对电路进行设计与功能验证。结果表明本文设计的带可控硅调光功能的LED驱动芯片符合设计要求,无闪烁调光范围达到4%-100%。
[Abstract]:The invention of LED, known as the fourth generation lighting technology, is a historic leap in the history of human lighting. It is one of the important ways to solve the energy shortage and excessive consumption. Led has been widely used in lighting systems of various electronic devices. In particular, the rapid development of small devices such as mobile phone pad. Led industry has also accelerated the progress of dimming industry. Dimming technology can not only save energy and prolong the service life of LED, but also improve visual effect and quality of life. Thyristor dimming has dominated the lighting dimming field for nearly half a century since its emergence in the 1960s. Its high compatibility, low-cost, small volume, easy to operate and other advantages deeply favored by consumers. In this paper, a dimming related circuit of LED driver chip is designed based on thyristor dimming. This paper analyzes and compares the popular dimming technology at home and abroad and their respective advantages and disadvantages, and emphatically analyzes the thyristor dimming technology, and finally determines the dimming scheme using silicon controlled dimming as the chip. In order to solve the flicker phenomenon of thyristor dimming, the discharge path and active damping network are designed in this paper. In order to realize the brightness control, a phase control circuit is designed. By measuring the silicon controlled phase angle and converting it into the average current of controlling the LED, a phase control circuit is designed. The input voltage range of the chip is wide and self-supply can be realized. The reduced voltage flyback converter is used as the peripheral topology of the LED drive chip, and the novel control algorithm realizes accurate constant current, eliminates the complicated control loop compensation, reduces the use of external components and improves the efficiency. In this paper, several key modules in the LED driver are analyzed and verified in detail. Including power supply circuit, bandgap voltage reference source, zero-crossing detection, phase measurement and other modules. The circuit is designed and verified by using TSMC 0.5um BCD technology and cadence HSPICE software. The results show that the LED driver chip with thyristor dimming function meets the design requirements, and the range of no flicker dimming reaches 4- 100.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM923.34

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