Title :
Electronic driver without electrolytic capacitor for dimming High Brightness LEDs
Author :
Garcia, J. ; Calleja, A.J. ; Corominas, E.L. ; Gacio, D. ; Ribas, J.
Author_Institution :
Dept. of Electr. Eng., Univ. of Oviedo, Oviedo, Spain
Abstract :
This paper presents a full ballast for driving an assembly of high brightness LEDs, based on a new dc to dc converter. The converter provides a constant current waveform to the load parting from a DC bus voltage. The converter, operating with a peak current control, keeps the current through the LEDs constant independently of the bus voltage. This is carried out internally by self-adjusting the switching frequency of the converter. Thus, the requirements of the capacitance of the bus capacitor are greatly diminished, allowing the avoidance of electrolytic technology. Also, low frequency PWM dimming can be carried out easily. The present work shows the design procedure and the experimental results obtained after building a prototype of a full ballast for HB LEDs.
Keywords :
DC-DC power convertors; LED lamps; electric current control; DC bus voltage; bus capacitor; dc to dc converter; electronic driver; high brightness LED; low frequency PWM dimming; peak current control; Assembly; Brightness; Capacitors; Current control; DC-DC power converters; Driver circuits; Electronic ballasts; Light emitting diodes; Pulse width modulation; Voltage; Electrolytic Capacitor Avoidance; Electronic Light Dimming; High Brightness LEDs; System modeling and control;
Conference_Titel :
Industrial Electronics, 2009. IECON '09. 35th Annual Conference of IEEE
Conference_Location :
Porto
Print_ISBN :
978-1-4244-4648-3
Electronic_ISBN :
1553-572X
DOI :
10.1109/IECON.2009.5415167