Application of color temperature tunable LEDs in smart lighting system

This paper presents a realization of indoor smart lighting system, both brightness and color temperature (CT) can be regulated wirelessly based on JenNet-IP protocol. Based on the tunable color temperature theories, warm white cool white LED combination method is adopted in this system. We also adopt a chip-on-board package structure to package the different color temperature LEDs in a single light source. The JN5168 IEEE802.15.4 wireless microcontrollers are used to design the remote control unit and to produce two PWM control signals. Drive circuit transferring PWM signal into LED drive current is designed. Experimental results show that the correlated color temperature (CCT) can be adjusted from 2700K to 6500K. With the help of remote control unit, both brightness and color temperature can be adjusted, which could satisfy the requirement for the indoor lighting.