驱动led阵列的电源及拓扑解决方案
大量的LED,特别是高亮度LED(HB LED),越来越多地被用于各种阵列配置,用于显示背光照明、区域照明和数字标牌。当驱动一个或几个发光二极管是相当简单的,这样做对这些较大的阵列带来的问题,整个LED互连拓扑结构,以及选项供电,甚至控制阵列。
一个单一的LED需要20和60毫安之间的驱动电流,并有一个电压下降1.8至4 V(名义上1.8 V的红色LED,移动到2 V的琥珀,2.2 V为黄色,3.5伏为绿色,3.6 V为蓝色,高达4 V为白色)。驱动发光二极管意味着设计者必须把他们的想法从更常见的电压源供应转移到不常见的,但同样可行的电流源(恒流)供应或驱动,他们往往不熟悉这种供电模式及其含义。
The LED power-supply (see the TechZone article “How to Choose the Right Power Supply for Your LED Lighting Project”) and driver chain is conceptually simple (Figure 1)。 Driving the LEDs themselves is both easy and difficult. It is easy because they individually are a low/moderate current and voltage load, and the driver can operate at an efficient DC/DC conversion frequency, usually between 100 kHz and 1.5 MHz. However, it is difficult because the driver must act as a current source, not the more conventional voltage source, and this places new and sometimes difficult demands on its circuitry (and designers of the circuitry)。
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