LED Driver with TRIAC Dimming Control by Variable Switched Capacitance for Power Regulation

Eun-Soo Lee; Yeung-Hoon Sohn; Duy Tan Nguyen; Jun-Pil Cheon; Chun-Taek Rim

LED Driver with TRIAC Dimming Control by Variable Switched Capacitance for Power Regulation

Vol. 15, No. 2, pp. 555-566, Mar. 2015

10.6113/JPE.2015.15.2.555

Controlled current mirror

DC power supply circuit

TRIAC dimming control

Variable switched capacitance

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Abstract

A TRIAC dimming LED driver that can control the brightness of LED arrays for a wide range of source voltage variations isproposed in this paper. Unlike conventional PWM LED drivers, the proposed LED driver adopts a TRIAC switch, whichinherently guarantees zero current switching and has been proven to be quite reliable over its long lifetime. Unlike previousTRIAC type LED drivers, the proposed LED driver is composed of an LC input filter and a variable switched capacitance, whichis modulated by the TRIAC turn-on timing. Thus, the LED power regulation and dimming control, which are done by a volumeresistor in the same way as the conventional TRIAC dimmers, can be simultaneously performed by the TRIAC control circuit. Because the proposed LED driver has high efficiency and a long lifetime with a high power factor (PF) and low total harmonicdistortion (THD) characteristics, it is quite adequate for industrial lighting applications such as streets, factories, parking garages,and emergency stairs. A simple step-down capacitive power supply circuit composed of passive components only is alsoproposed, which is quite useful for providing DC power from an AC source without a bulky and heavy transformer. A prototype60 W LED driver was implemented by the proposed design procedure and verified by simulation and experimental results, wherethe efficiency, PF, and THD are 92%, 0.94, and 6.3%, respectively. The LED power variation is well mitigated to below ± 2%for 190 V < Vs < 250 V by using the proposed simple control circuit.

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Cite this article

[IEEE Style]

E. Lee, Y. Sohn, D. T. Nguyen, J. Cheon, C. Rim, "LED Driver with TRIAC Dimming Control by Variable Switched Capacitance for Power Regulation," Journal of Power Electronics, vol. 15, no. 2, pp. 555-566, 2015. DOI: 10.6113/JPE.2015.15.2.555.

[ACM Style]

Eun-Soo Lee, Yeung-Hoon Sohn, Duy Tan Nguyen, Jun-Pil Cheon, and Chun-Taek Rim. 2015. LED Driver with TRIAC Dimming Control by Variable Switched Capacitance for Power Regulation. Journal of Power Electronics, 15, 2, (2015), 555-566. DOI: 10.6113/JPE.2015.15.2.555.