Title :
Pulsed current source with active control of the on-time current for LED lamp driver applications
Author :
Branas, C. ; Azcondo, F.J. ; Casanueva, R. ; Diaz, F.J.
Author_Institution :
Syst. & Autom. Eng. Dept., Univ. of Cantabria, Santander, Spain
Abstract :
This paper presents a simplified envelope model to study the dynamics of a phase-controlled resonant converter suitable to drive light emitting diode (LED) lamps. The approximate closed form of the transfer function is obtained from the proposed reduced-order model. The fast dynamics of the resonant converter allows us implementing a pulsed current source with active control of the on-time-current free of instabilities and flicker effect with a type II or integral-single-lead controller. A 120W prototype intended for street lighting applications has been built to validate the study.
Keywords :
LED lamps; electric current control; lighting control; reduced order systems; resonant power convertors; transfer functions; LED lamp driver; active control; integral-single-lead controller; light emitting diode lamps; on-time current; pulsed current source; reduced-order model; resonant converter; transfer function; Impedance; Integrated circuit modeling; Light emitting diodes; Mathematical model; Resonant frequency; Resonant inverters; Transfer functions; LED lamps; Light sources; close loop systems; feedback circuits; lighting control; negative feedback; phase shifters;
Conference_Titel :
Industrial Electronics Society, IECON 2014 - 40th Annual Conference of the IEEE
DOI :
10.1109/IECON.2014.7048735
