Single-Stage, Universal-Input AC/DC LED Driver With Current-Controlled Variable PFC Boost Inductor

This paper presents a single-stage flyback power-factor-correction (PFC) circuit with a variable boost inductance for high-brightness LED applications for the universal input voltage (90-270 V rms ). The proposed circuit overcomes the limitations of the conventional single-stage PFC flyback with a c...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2012-03, Vol.27 (3), p.1579-1588
Main Authors: Yuequan Hu, Huber, L., Jovanović, M. M.
Format: Article
Language:English
Subjects:
Applied sciences
Circuit properties
Circuits
Driver circuits
Electric currents
Electric power
Electric, optical and optoelectronic circuits
Electrical engineering. Electrical power engineering
Electrical machines
Electronic circuits
Electronics
Exact sciences and technology
Inductance
Inductors
LED driver
Light emitting diodes
Magnetic cores
Magnetic devices
Power electronics, power supplies
power factor correction (PFC)
Regulation and control
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Signal convertors
single stage
variable boost inductance
Voltage control
Windings
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Summary:This paper presents a single-stage flyback power-factor-correction (PFC) circuit with a variable boost inductance for high-brightness LED applications for the universal input voltage (90-270 V rms ). The proposed circuit overcomes the limitations of the conventional single-stage PFC flyback with a constant boost inductance that cannot be designed to achieve a practical maximum bulk-capacitor voltage level (i.e., less than 450 V) at high line while meeting required line-current harmonic specifications at low line. According to the proposed method for achieving variable boost inductance, the boost inductance has a constant high value at high line, while at low line it is reduced proportionally to the load current, so that the IEC 61000-3-2 class C and corresponding Japanese JIS C 61000-3-2 class C line-current harmonic limits are satisfied. The proposed single-stage PFC flyback LED driver with the variable boost inductor is experimentally verified on a 24-V/91-W prototype circuit.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2010.2082564