LED SCENERY LIGHTING LAMP AUTOMATICALLY FLICKERING AND CONTROLLING ILLUMINANCE ACCORDING TO SURROUNDINGS LIGHTNESS

摘要

An LED lamp automatically controlling an automatic ON/OFF switching and brightness thereof is provided to save energy and to increase life-span by controlling brightness thereof automatically. An LED lamp automatically controlling an automatic ON/OFF switching and brightness thereof includes an LED(150), a ambient light receiver(110), a comparator(120), a controller(130), a power supply controller(140), and a current controller(160). The LED emits light and is powered by a power supply. The light receiver transforms the light inputted from an ambient part into electrical signals indicating ambient illumination. The comparator outputs difference between the ambient illumination and a reference illumination after comparing the ambient illumination and the reference illumination. The controller outputs a power supply control signal and a pulse width signal based on the difference between the ambient illumination and the reference illumination. The power supply controller controls power supply to the LED by the power supply control signal. The current controller is connected to the LED in serial and controls brightness of the LED by controlling current in the LED based on the pulse width signal.