A Universal-Input Single-Stag2e High-Power-Factor Power Supply for HB-LEDs Based on Integrated Buck-Flyback Converter

Due to the high rise in luminous efficiency that high-brightness light-emitting diodes (HB-LEDs) have experienced in recent years, many new applications have been researched. This paper covers a streetlight LED application using the offline integrated buck-flyback converter (IBFC) developed in previ...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2011-02, Vol.58 (2), p.589-599
Main Authors: Gacio, David, Alonso, J. Marcos, Calleja, Antonio J., Garcia, Jorge, Rico-Secades, Manuel
Format: Article
Language:English
Subjects:
Buck converters
Buck-flyback converters
Circuit topology
closed-loop operation
Converters
Costs
DC-DC power converters
Dimming
Dynamics
Electromagnetic interference
electronic ballast
Feasibility
high-brightness light-emitting diode (HB-LED)
LED lighting
Light-emitting diodes
Modulation
offline application
Permission
Power factor correction
Power supplies
power-factor correction (PFC)
Reactive power
small-signal modeling
Topology
two-stage integrated converter
Voltage
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Summary:Due to the high rise in luminous efficiency that high-brightness light-emitting diodes (HB-LEDs) have experienced in recent years, many new applications have been researched. This paper covers a streetlight LED application using the offline integrated buck-flyback converter (IBFC) developed in previous works. In this application, the converter is used to provide power-factor correction from a universal ac source. A control loop using the LM3524 IC has been implemented for testing the feasibility of Enabling pulsewidth modulation dimming mode. First, the LED load has been linearized and modeled in order to calculate the IBFC topology properly. Second, the converter has been designed and tested at the laboratory. The converter has also been modeled in order to design a fixed-frequency constant-current control. The dynamics of all the stages involved in the closed loop have been taken into account in order to develop an adequate controller. Finally, the experimental results obtained from the laboratory tests are discussed.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2010.2046578