Title :
A Universal-Input Single-Stage High-Power-Factor Power Supply for HB-LEDs Based on Integrated Buck-Flyback Converter
Author :
Gacio, D. ; Alonso, J.M. ; Calleja, A.J. ; Garcia, J. ; Rico-Secades, M.
Author_Institution :
Univ. de Oviedo, Gijon
Abstract :
Due to the high rise in luminous efficiency that HB-LEDs have experienced in the last recent years, many new applications have been researched. In this paper, a streetlight LED application will be covered, using the integrated buck-flyback converter developed in previous works, which performs power factor correction (PFC) from a universal AC source, as well as a control loop using the LM3524 IC, which allows PWM dimming operation mode. Firstly, the LED load will be linearized and modeled in order to calculate the IBFC topology properly. Afterwards, the converter will be calculated, presenting the one built in the lab. Secondly, the converter will be modeled in order to build the closed loop system, modeling the current sensor as well in order to develop an adequate controller. Finally, experimental results obtained from the lab tests will be presented.
Keywords :
LED lamps; power convertors; power factor correction; power supply circuits; street lighting; LM3524 IC; PWM dimming operation; high brightness LED; integrated buck-flyback converter; power factor correction; streetlight LED; universal AC source; universal-input single-stage high-power-factor power supply; Application specific integrated circuits; Closed loop systems; Light emitting diodes; Power factor correction; Power supplies; Power system modeling; Pulse width modulation; Pulse width modulation converters; Sensor systems; Topology;
Conference_Titel :
Applied Power Electronics Conference and Exposition, 2009. APEC 2009. Twenty-Fourth Annual IEEE
Conference_Location :
Washington, DC
Print_ISBN :
978-1-4244-2811-3
Electronic_ISBN :
1048-2334
DOI :
10.1109/APEC.2009.4802714
