Primary Side Constant Power Control Scheme for LED Drivers Compatible with TRIAC Dimmers

Junming Zhang; Ting Jiang; Lianghui Xu; Xinke Wu

Primary Side Constant Power Control Scheme for LED Drivers Compatible with TRIAC Dimmers

Vol. 13, No. 4, pp. 609-618, Jul. 2013

10.6113/JPE.2013.13.4.609

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Abstract

This paper proposes a primary side constant power control scheme for TRIAC dimmer compatible LED drivers. The LED driver is a Flyback converter operated in boundary conduction mode (BCM) to minimize the switching loss. With the proposed control scheme, the input power of the Flyback converter can be controlled by the TRIAC dimming angle, which is not affected by AC input voltage variations. Since the output voltage is almost constant for LED loads, the output current can be changed by controlling the input power with a given conversion efficiency. The isolated feedback circuit is eliminated with the proposed primary side control scheme, which dramatically simplifies the whole circuit. In addition, the input current automatically follows the input voltage due to the BCM operation, and the resistive input characteristic can be achieved which is attractive for TRIAC dimming applications. Experimental results from a 15W prototype verify the theoretical analysis.

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Cite this article

[IEEE Style]

J. Zhang, T. Jiang, L. Xu, X. Wu, "Primary Side Constant Power Control Scheme for LED Drivers Compatible with TRIAC Dimmers," Journal of Power Electronics, vol. 13, no. 4, pp. 609-618, 2013. DOI: 10.6113/JPE.2013.13.4.609.

[ACM Style]

Junming Zhang, Ting Jiang, Lianghui Xu, and Xinke Wu. 2013. Primary Side Constant Power Control Scheme for LED Drivers Compatible with TRIAC Dimmers. Journal of Power Electronics, 13, 4, (2013), 609-618. DOI: 10.6113/JPE.2013.13.4.609.