機械工程學系Huang, Bin-JuineBin-JuineHuangChen, Chun-WeiChun-WeiChenOng, Chin-DianChin-DianOngDu, Bo-HanBo-HanDuHuang B.-J.Hsu, Po-ChienPo-ChienHsu2014-10-242018-06-282014-10-242018-06-282013-0113594311http://ntur.lib.ntu.edu.tw//handle/246246/260620https://www.scopus.com/inward/record.uri?eid=2-s2.0-84866532168&doi=10.1016%2fj.applthermaleng.2012.07.030&partnerID=40&md5=2b1682e5286a4db7582188cac51bc440The illumination of an LED may be affected by operating temperature even under constant-current condition. A constant-power driving technique is proposed in the present study for LED luminaire. A linear system dynamics model of LED luminaire is first derived and used in the design of the feedback control system. The PI controller was designed and tuned taking into account the control accuracy and robust properties with respect to plant uncertainty and variation of operating conditions. The control system was implemented on a microprocessor and used to control a 150W LED luminaire. The test result shows that the feedback system accurately controls the input power of LED luminaire to within 1.3 per cent error. As the ambient temperature changes from 0 to 40 °C, the LED illumination varies slightly (-1.7%) for constant-power driving, as compared to that of constant-current driving (-12%) and constant-voltage driving (+50%). The constant-power driving has revealed advantage in stabilizing the illumination of LED under large temperature variation. © 2012 Elsevier Ltd. All rights reserved.900447 bytesapplication/pdfConstant-power driving LED; LED control; LED driving; LED lighting; LED lighting control[SDGs]SDG7Ambient temperature change; Constant-current; Control accuracy; Driving control; Feedback systems; Input power; Large temperature variations; LED illumination; LED lighting; Operating condition; Operating temperature; PI Controller; Plant uncertainty; System dynamics model; Adaptive control systems; Lighting; Linear systems; Temperature; Light emitting diodesconference paper10.1016/j.applthermaleng.2012.07.0302-s2.0-84866532168http://ntur.lib.ntu.edu.tw/bitstream/246246/260620/1/2013 ATE cp-LED.pdf