A Novel Line Frequency Multistage Conduction LED Driver With High Power Factor

This paper proposes a novel line frequency multistage conduction LED driver with current-limiting mechanism. By operating the LED driver in multistage conduction, the number of LEDs can be automatically adjusted to be driven with low ac voltage, which increases the LED utilization rate. The current-...

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Bibliographic Details
Published inIEEE transactions on power electronics Vol. 30; no. 9; pp. 5103 - 5115
Main Authors Liang, Tsorng-Juu, Tseng, Wei-Jing, Chen, Jiann-Fuh, Wu, Jyun-Peng
Format Journal Article
LanguageEnglish
Published New York IEEE 01.09.2015
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Capacitors
Conductivity
current-limiting mechanism
Electric currents
Electronic mail
Energy efficiency
Frequencies
LED
Light emitting diodes
Limiting
MOSFET
multistage conduction
power factor
Prototypes
Reactive power
Temperature
total harmonic distortion
utilization rate
Waveform analysis
power factor (PF)
LED
total harmonic distortion (THD)
multistage conduction
Current-limiting mechanism
utilization rate
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Summary:This paper proposes a novel line frequency multistage conduction LED driver with current-limiting mechanism. By operating the LED driver in multistage conduction, the number of LEDs can be automatically adjusted to be driven with low ac voltage, which increases the LED utilization rate. The current-limiting mechanism offers overcurrent protection to the LEDs. With the aim of shaping the input current into a sinusoidal waveform, the number of LEDs and the current-limit values are determined by the proposed analysis methods; these steps improve the power factor (PF) and the total harmonic distortion of input current (THDi). Finally, two prototype circuits--two-stage conduction and three-stage conduction LED drivers- are built to verify the performances, such as LED utilization rate, THDi, PF, and system efficiency.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2014.2363293