Design of LED Lighting System with Automatic Dimming, Mixing and Situational Control

This paper designs an LED automatic lighting system for home use. The system has the functions of automatic dimming and automatic adjustment of indoor brightness and control of curtains, which consists a bridge rectifier, a double-ended Flyback converter and a bidirectional Buck/Boost converter are used as the main structure of power conversion, and the microcoltroller (MCU) dsPIC30F4011 is used for circuit control. Furthermore, the system can automatically control the turn-on/turn-off of curtains and LEDs according to the brightness of indoor and outdoor light; when the outdoor brightness is sufficient but the indoor brightness is insufficient, the curtains will be opened, and the LED lights will be turned on to make up for the lack of indoor brightness. When the brightness of indoor is insufficient, the curtains will be closed and the LED lights will be turned on to prevent outsiders from peeping and maintain the indoor brightness, so that the indoor brightness can be maintained at a certain value, and the effect of energy saving and power saving can be achieved at the same time. In addition, the system also has the functions of automatic dimming and light mixing. The operator can also connect with the ATmega328 through the mobile phone bluetooth, and manually adjust the color of the light source through the APP to achieve the effect of light mixing and situational control.