Title :
An LED color control system with independently changeable illuminance
Author :
Kim, Hoon ; Liu, Jia ; Jin, Ho-Sang ; Kim, Hee-Jun
Author_Institution :
Dept. of Semicond. Eng., Cheongju Univ., Chungbuk, South Korea
Abstract :
This paper presents and LED color control system using color control algorithm which adjusts its color temperature and illuminance independently. The proposed system consists of a power factor correction (PFC) circuit, LED driving circuit, and a digital controller. The color temperature variation range of the proposed LED lighting system is 3500-7500°K, and its illuminance one is 500-1500 lux. Within these range, the color temperature and illuminance relative deviations are as low as ±1%.
Keywords :
driver circuits; light emitting diodes; optical variables control; LED color control system; LED driving circuit; color temperature; digital controller; independently changeable illuminance; power factor correction circuit; temperature 3500 K to 7500 K; Control systems; Frequency conversion; Inductors; Light emitting diodes; Magnetic cores; Magnetic materials; Shape; Switching frequency; Toroidal magnetic fields; Transformer cores;
Conference_Titel :
Telecommunications Energy Conference, 2009. INTELEC 2009. 31st International
Conference_Location :
Incheon
Print_ISBN :
978-1-4244-2490-0
Electronic_ISBN :
978-1-4244-2491-7
DOI :
10.1109/INTLEC.2009.5351875
