Temperature-Robust LC3 Passive LED Drivers With Low THD, High Efficiency and PF, and Long Life

New passive LED drivers that can reduce the total harmonic distortion (THD) significantly by LC parallel resonance are proposed. Using an inductor and three capacitors, called LC 3 , novel characteristics, such as high power efficiency and power factor (PF) with extremely long life time are achieved...

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Bibliographic Details
Published inIEEE journal of emerging and selected topics in power electronics Vol. 3; no. 3; pp. 829 - 840
Main Authors Lee, Eun S., Choi, Bo H., Cheon, Jun P., Lim, Gyu C., Kim, Bong C., Rim, Chun T.
Format Journal Article
LanguageEnglish
Published Piscataway IEEE 01.09.2015
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Arrays
Capacitors
Harmonic analysis
high power efficiency
LC parallel resonance
Light emitting diodes
long lifetime
Passive LED driver
phasor transformation
Power harmonic filters
Rectifiers
Switches
temperature-robust
long lifetime
passive LED driver
High power efficiency
LC parallel resonance
phasor transformation
temperature-robust
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Summary:New passive LED drivers that can reduce the total harmonic distortion (THD) significantly by LC parallel resonance are proposed. Using an inductor and three capacitors, called LC 3 , novel characteristics, such as high power efficiency and power factor (PF) with extremely long life time are achieved. The proposed LED drivers have a temperature-robust characteristic, because their power is hardly changed by temperature. By selecting the number of LEDs in series n s appropriately, the LED power variation caused by temperature change in LED can be zero. For the universal use of the proposed LED drivers in various countries with different frequencies, circuit configurations applicable to 50/60 Hz are proposed. To analyze the LED power and PF of the proposed LED driver, the phasor transformation was, for the first time, applied to nonlinear diode rectifier modeling. Although the proposed LED driver is a nonlinear switching circuit, the proposed analyses matched well with simulation and experimental results. A prototype LED driver showed a very high power efficiency of 95.2% at 70 W, meeting PF and THD regulations for source voltage variation of ±6% of 220 V, even when a reasonably small number of filters were used.
ISSN:2168-6777
2168-6785
DOI:10.1109/JESTPE.2015.2446766