新的闪烁建议将如何影响LED照明设计

　　新的闪烁建议将如何影响LED照明设计

　　有研究表明，闪烁––亮度随时间变化––照明在一定频率范围内发生危害健康。虽然这个问题是针对白炽灯和荧光照明，它再次出现了设计工程师的挑战，因为引进的LED为主流照明。

　　但现在，经过广泛的调查，美国的电气和电子工程师协会（IEEE）已经公布了消除LED照明中可见闪烁的推荐做法。题为“推荐实践调节高亮度LED电流降低健康风险的观众，”IEEE Std. 1789-2015解释什么是闪烁的LED照明提供了可以帮助制造商设计产品，尽可能减少闪烁相关的健康和生产力的影响指导称。

　　The primary source of flicker in an LED-based product is the power supply or “LED driver.” LED-based products with well-designed drivers can deliver light with minimal flicker， but doing so can increase the cost and/or size of the driver circuitry. For example， smaller products such as MR16 replacement lamps are more susceptible to flicker due to size limitations on the driver.

　　This article takes a look at why flicker should be controlled， describes the IEEE recommendations and considers a selection of contemporary drivers that could be employed as the basis of a flicker-free power supply.