Temperature-Robust LC&lt;sup&gt;3&lt;/sup&gt; Passive LED Drivers With Low THD, High Efficiency and PF, and Long Life

Lee, Eun S.; Choi, Byoung Ho; Cheon, Jun P.; Lim, Gyu Cheol; Kim, Bong C.; Rim, Chun T.

doi:10.1109/jestpe.2015.2446766

Cited by 28 publications

(15 citation statements)

References 29 publications

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“…All the circuit parameters are assumed to be ideal unless otherwise specified. passive-type LC 3 LED driver [29], except for a parallel resonance capacitor, which is not connected to the inductor L 1 in parallel in the proposed LED driver. Mode 2 [t 1 , t 2 ] : In this mode, the TRIAC is turned off and the initial condition is v 2 (t 1 ) = 0.…”

Section: B Operating Mode Analysis Of the Proposed Led Drivermentioning

confidence: 99%

“…1 can be controlled by modulating 5 Ω, respectively, at the nominal LED current of 80 mA [29]. As shown in Fig.…”

Section: Variable Switched Capacitormentioning

confidence: 99%

“…The value of R L is set to 734 Ω with consideration of V L = 235 V and I L = 0.32 A in (2): an R 1 value greater than 1.9, 2.3, and 2.8 MΩ for C v1 , C v2 , and C v3 , respectively, cannot be adopted in this case. From the simulation results of ) can be calculated and α is assumed to be 0.8 for a non-linear diode rectifier [29]. Therefore, it is found from Fig.…”

Section: Variable Switched Capacitormentioning

confidence: 99%

“…1, the proposed LED driver was based on the passive-type LC 3 LED driver [29]; hence, circuit parameters for 80 W of power were chosen in a similar way, as listed in Table I.…”

Section: Design Of the Proposed Led Drivermentioning

confidence: 99%

“…These drawbacks reduce the total lifetime of LED lighting systems composed of LED lamps and dedicated LED drivers. Hence, passive LED drivers are preferred because of their extremely high power efficiency and long life [25]- [29]. Even though switching devices such as MOSFET and BJT are not adopted in the LED drivers, the PF and THD characteristics can be satisfied with global standards with a simple structure.…”

Section: Introductionmentioning

confidence: 99%

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Long-Lasting and Highly Efficient TRIAC Dimming LED Driver with a Variable Switched Capacitor

Lee¹,

Choi²,

Nguyen³

et al. 2016

Journal of Power Electronics

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A triode for alternating current (TRIAC) dimming light emitting diode (LED) driver, which adopts a variable switched capacitor for LED dimming and LED power regulation, is proposed in this paper. The proposed LED driver is power efficient, reliable, and long lasting because of the TRIAC switch that serves as its main switch. Similar to previous TRIAC dimmers for lamps, turn-on timing of a TRIAC switch can be controlled by a volume resistor, which modulates the equivalent capacitance of the proposed variable switched capacitor. Thus, LED power regulation against source voltage variation and LED dimming control can be achieved by the proposed LED driver while meeting the global standards for power factor (PF) and total harmonic distortion (THD). The long life and high power efficiency of the proposed LED driver make it appropriate for industrial lighting applications, such as those for streets, factories, parking garages, and emergency stairs. The detailed analysis of the proposed LED driver and its design procedure are presented in this paper. A prototype of 80 W was fabricated and verified by experiments, which showed that the efficiency, PF, and THD at V s = 220 V are 93.8%, 0.95, and 22.5%, respectively; 65 W of LED dimming control was achieved with the volume resistor, and the LED power variation was well mitigated below 3.75% for 190 V < V s < 250 V.

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Section: B Operating Mode Analysis Of the Proposed Led Drivermentioning

confidence: 99%

“…1 can be controlled by modulating 5 Ω, respectively, at the nominal LED current of 80 mA [29]. As shown in Fig.…”

Section: Variable Switched Capacitormentioning

confidence: 99%

Section: Variable Switched Capacitormentioning

confidence: 99%

“…1, the proposed LED driver was based on the passive-type LC 3 LED driver [29]; hence, circuit parameters for 80 W of power were chosen in a similar way, as listed in Table I.…”

Section: Design Of the Proposed Led Drivermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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