一款负压非隔离型LED照明驱动芯片XD1413的设计

发布时间：2018-05-06 02:04

本文选题：LED照明 + 非隔离　；参考：《西安电子科技大学》2014年硕士论文

【摘要】：在节能以及环保的大势所趋下,发光二极管(LED)照明应运而生。LED灯以其较高的光效、非常长的寿命、越来越低的价格以及精美的外形,逐渐进入了人们的视野。从2013年开始,LED灯的市场异常火热。当然,竞争也是异常激烈的。为了能够在激烈的竞争中胜出,更高的性能及可靠性以及更低的价格受各个厂商所追求。目前LED灯珠的价格已经很低,继续降价的空间非常有限。因此,想要降低LED灯具的价格,最容易实现的方法是通过LED的驱动电路入手。在保证驱动电路的可靠性的前提下,将外围电路与芯片内部电路尽可能的精简,从而降低成本已经成为大势所趋。传统的LED驱动电路是以AC-DC芯片为基础,将外围应用电路针对LED负载的特性稍作调整以后直接作为其驱动电路来使用。这种方法不仅体积大,在空间有限的灯壳内很难安装,限制了其应用环境,而且其成本又极为高昂。其成本一方面来源于过于复杂的外围应用电路,另一方面,芯片的许多功能没有得到充分利用。除了成本较高以外,传统的LED驱动芯片由于没有针对LED照明应用进行专门定制,其安全性也值得商榷。本篇论文首先介绍了LED照明驱动的发展方向,在保证驱动精度和可靠性基础上,提出了一种专门为LED照明而定制的开关型驱动控制芯片XD1413。然后从发光二极管的发光原理出发,给出了发光二极管的等效结构。在了解了我们需要驱动的负载的特性的基础上,介绍了各种开关变换器的基本原理。针对LED对电流的大小极为敏感的特性,XD1413采用了恒流控制的方法,精确地控制流过LED的电流。通过对整体环路的稳定性分析与设计,保证了在85V AC~265V AC的超大输入电压范围内,系统都能达到±3%的输出电流精度。完善的保护电路,如过压保护,过流保护以及过温保护等,保证了在各种复杂环境下工作的安全性。此外,在XD1413的设计过程中还着重考虑了电磁干扰的影响,通过使其内部的振荡器的频率随时间周期性的变化,将某一频率下的电磁干扰能量均匀地分布到一定范围内的频率点上,使得在外围应用的设计过程中,更容易满足电磁兼容的要求。XD1413的设计是基于1μm 5V/20V/500V的BCD工艺完成的,采用Hspice仿真工具,对其功能与指标进行了仿真验证。通过对仿真结果的分析,验证了XD1413在极为精简的外围应用电路以及内部结构的前提下,具备极高的精度以及安全性,达到了设计目标。
[Abstract]:Under the trend of energy saving and environmental protection, light emitting diode (LED) lighting emerges as the times require.LED light with its higher light efficiency, very long life, lower price and exquisite shape, and gradually entered people's vision. Since 2013, the market of LED lamps is very hot. Of course, the competition is also very intense. In order to be able to be excited In the fierce competition, higher performance, reliability and lower prices are pursued by various manufacturers. At present, the price of LED beads is very low and the space for continuing reduction is very limited. Therefore, the easiest way to reduce the price of LED lamps is to start with the drive circuit of the LED. On the premise, it has become the general trend to reduce the peripheral circuit and the internal circuit of the chip, thus reducing the cost. The traditional LED drive circuit is based on the AC-DC chip, and then uses the peripheral application circuit for the LED load to be used directly as its driving circuit. This method is not only large in volume, but also in space. The limited lamp housing is difficult to install, and its application environment is limited, and its cost is very high. On the one hand, the cost is derived from the overly complex peripheral application circuit. On the other hand, many functions of the chip are not fully utilized. Besides the high cost, the traditional LED drive chip has not been specially designed for the LED lighting application. This paper first introduces the direction of the development of LED lighting drive. On the basis of ensuring the precision and reliability of the drive, a switch type drive control chip XD1413. specially designed for LED lighting is put forward, and then the equivalent junction of the LED is given from the light emitting principle of the light emitting diode. On the basis of understanding the characteristics of the load we need to drive, the basic principles of various switching converters are introduced. In view of the very sensitive characteristics of LED to the size of the current, XD1413 uses a constant current control method to accurately control the current flowing through the LED. By analyzing and designing the stability of the whole ring road, the 85V AC~ is guaranteed. In the ultra large input voltage range of 265V AC, the system can reach an output current precision of up to 3%. Perfect protection circuits, such as overvoltage protection, overcurrent protection and over temperature protection, ensure the safety of working in various complex environments. In addition, the influence of electromagnetic interference is considered in the design of XD1413, through which it is made inside. The frequency of the oscillator changes with time periodically. The electromagnetic interference energy at a certain frequency is evenly distributed to the frequency point within a certain range, which makes the design of the electromagnetic compatibility more easy to meet the requirement of electromagnetic compatibility in the design process of the peripheral application. The design of.XD1413 is based on the BCD process of 1 m 5V/20V /500V, and uses the Hspice simulation worker. The function and index are simulated and verified. Through the analysis of the simulation results, it is proved that XD1413 has very high precision and security on the premise of extremely streamlined peripheral application circuit and internal structure, and achieves the design goal.

【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM923.34

【参考文献】