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Light Is On When Power Is Out

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摘要:在黑暗的损失(由光敏电阻检测)的交流电源接通电池供电白光LED阵列。为了节省电能,定时器关闭后的特定时间内的LED (例如, 10分钟

Maxim > App Notes > Amplifier and Comparator Circuits Display Drivers

Keywords: Emergency lighting, white LEDs, light detection, photoresistor, comparators Feb 16, 2005

APPLICATION NOTE 3444
Light Is On When Power Is Out

Abstract: A loss of AC power during darkness (sensed by a photoresistor) turns on an array of battery-
powered white LEDs. To conserve power, a timer turns off the LEDs after a particular period of time (for
example, 10 minutes).

Power outages can occur when least expected, leaving you in total darkness. Whether in a hospital, a theater, or
your home, such occasions call for an emergency lighting system that turns on automatically with loss of power.
The preferred emergency light source is the white LED, which is gaining popularity as a compact, power-……
Light Is On When Power Is Out
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