新的解决方案提高LED照明的调光性能
最大的挑战之一,LED照明设计师所面对的是在可控硅调光器的LED灯的调光性能。在许多情况下,与白炽灯泡相比,这会导致闪烁和降低亮度范围。问题是,可控硅调光器的设计基于使用的白炽灯,具有电阻性负载。当LED开始被使用的调光器,低电流的要求,随着器件的非电阻,使双向晶闸管间歇地打开和关闭,造成闪烁的效果。
LED和LED驱动器是非电阻性负载,其输入电流通常低于控股的可控硅调光器的电流。这会导致闪烁和有限的调光范围。
LED驱动器制造商已经开发出新的解决方案来解决这个闪烁的问题。一种方式是通过将放气和LED驱动电路的阻尼。什么样的分压电路是保证输入电流大于保持双向晶闸管的电流限制。阻尼电路的“抑”的电流振荡,这也有助于闪烁。
This article will examine several available LED driver ICs and designs that will help deliver flicker-free and fast startup dimming performance while still providing high power factor, high efficiency, and low THD for good lighting performance.
“These TRIAC wall-based dimmers were designed to work with incandescent bulbs, which are rated to operate at higher power levels and are resistive,” said Rakesh Anumula, applications engineer at Intersil Corp. “When migrating from incandescent bulbs to either CFLs or LED lighting, the load isn‘t resistive anymore, but it’s inductive or capacitive, so the dimmer doesn‘t behave the same way as would with an incandescent bulb.”
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