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本文设计了一种具有自适应调光功能的大功率LED驱动电源。通过光传感器BH1750对环境光照度值进行实时自动检测,利用I~2C总线实现与主控制器的数据传输,通过检测到的环境光照度值调节PWM波的占空比,进而控制AMC7140恒流驱动芯片实现对大功率LED的自适应调光。同时应用温度传感器DS18B20实时监测LED的温度,避免LED过热影响使用寿命和系统的稳定。
In this paper, a high-power LED driver with adaptive dimming function is designed. Real-time automatic detection of ambient light intensity by light sensor BH1750, using I ~ 2C bus to achieve data transmission with the host controller, through the detected ambient light intensity value to adjust the PWM wave duty cycle, and then control AMC7140 constant current driver chip implementation High-power LED adaptive dimming. At the same time the temperature sensor DS18B20 real-time monitoring of the LED temperature to avoid LED overheating affect the life and system stability.