Pulsed current source with active control of the on-time current for LED lamp driver applications
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AuthorBrañas Reyes, Christian; Azcondo Sánchez, Francisco Javier; Casanueva Arpide, Rosario; Díaz Rodríguez, Francisco Javier
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.