[经验]

选择LED驱动器时要考虑的5个因素

2018-10-12 08:54:56

5173 安森美驱动器

大多数人都不知道LED驱动器对于提供我们在当今先进的汽车照明系统中已经习惯的适应性和多样性的重要性。
在快速发展的汽车照明领域，LED驱动器提供了更加全面的选择，使汽车原始设备制造商能够改善节能，可视性安全优势，车辆氛围以及几年前车辆无法提供的消费者“哇”因素。
LED驱动器背后的关键功能是调节功率输出。
LED驱动器提供恒定的光输出，这意味着尽管可能存在功率变化，但LED仍能稳定供电。
然而，人们误以为LED驱动威廉希尔官方网站是“一刀切”的解决方案。
现实情况是，没有“通用”LED驱动器这样的东西。
每个应用程序都是独特的，需要独特的驱动程序设
请记住，LED驱动器的设计和质量会对个人或LED灯串的性能产生重大影响。
使用LED驱动器，您可以选择各种电源选项以实现最佳效率。
设计人员可以选择各种配置选项，并为软启动或应急灯功能等项目提供可调节性。
选择LED驱动器时，请务必考虑以下五个因素，以确定最适合您的应用：
1）每个功能的总LED功率：这是确定LED驱动器拓扑的关键。
2）电子设备的环境温度：例如，对于需要更亮LED的后照灯，线性驱动器由于其高功耗而不是最佳选择;
相反，开关驱动器是更好的选择，因为它更有效，因此在更高的功率水平下运行更冷。
3）改变LED配置的灵活性：通过使用多种亮度方法（如电压参考控制和PWM控制）实现光调节功能。
宽工作电源范围允许配置电源和驱动LED的数量。
4）支持的功能：如自动调光，单独LED控制，颜色变化。
5）支持的诊断和安全合规性：例如热警告，热关断，开路，短路，过流保护，单个LED故障，欠压和过压增压，LED温度监控。

以上来自于谷歌翻译

以下为原文

Most people are not aware of how important LED drivers are to providing the adaptability and variety we have become accustomed to in today’s advanced automotive lighting systems. In the rapidly evolving automotive lighting segment, LED drivers are providing ever more comprehensive options, allowing vehicle OEMs improved energy savings, visibility safety advantages, vehicle ambience and a consumer “wow” factor not available in vehicles just a few years ago.
The key function behind an LED driver is to regulate the power output. LED drivers provide a constant light output, meaning a steady supply to the LEDs, despite possible power variations. There is, however, a misconception that LED driver technology is a “one size fits all” solution. The reality is that there is no such thing as a “universal” LED driver. Every application is unique and requires a unique driver design. Remember, the design and quality of the LED driver has a significant impact on the performance of the individual or LED string.
With LED drivers, you can choose a variety of power supply options to achieve optimal efficiency. Designers have the ability to choose various configuration options, as well as provide adjustability for items such as soft start or emergency light functions.
When selecting an LED driver it is important to consider the following five factors to determine the best fit for your application:
1)    Total LED power per function: this is the key to determining LED driver topology.
2)    Ambient temperature of the electronics : For example, with rear lighting where brighter LEDs are required, a linear driver is not the best option because of its high power dissipation; instead, a switching driver is a better choice because it is more efficient and, hence, runs cooler at higher power levels.
3)    Flexibility to change LED configurations: light adjustment capabilities by using multiple luminance methods such as voltage reference control and PWM control. A wide operating supply range allows configuration of power supply and number of LEDs to drive.
4)    Supported features: such as auto dimming, individual LED control, color change.
5)    Supported diagnostics and safety compliance: such as thermal warning, thermal shutdown, open circuit, short, over-current protection, single LED failures, under voltage and overvoltage on booster, LED temperature monitoring.