Novel Single-inductor Multistring-independent Dimming LED Driver with Switched-capacitor Control Technique

Guozhuang; Liang Hanlei Tian

Novel Single-inductor Multistring-independent Dimming LED Driver with Switched-capacitor Control Technique

Guozhuang

Liang Hanlei Tian

Vol. 19, No. 1, pp. 1-10, Jan. 2019

10.6113/JPE.2019.19.1.1

Circuit analysis

Electromagnetic interference (EMI)

Load sharing

Switched capacitor

Voltage source converters

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Abstract

Current imbalance is the main factor affecting the lifespan of light-emitting diode (LED) lighting systems and is generally solved by active or passive approaches. Given many new lighting applications, independent control is particularly important in achieving different levels of luminance. Existing passive and active approaches have their own limitations in current sharing and independent control, which bring new challenges to the design of LED drivers. In this work, a multichannel resonant converter based on switched-capacitor control (SCC) is proposed for solving this challenge. In the resonant network of the upper and lower half-bridges, SCC is used instead of fixed capacitance. Then, the individual current of the LED array is obtained through regulation of the effective capacitance of the SCC under a fixed switching frequency. In this manner, the complexity of the control unit of the circuit and the precision of the multichannel outputs are further improved. Finally, the superior performance of the proposed LED driver is verified by simulations and a 4-channel experimental prototype with a rated output power of 20 W.

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Cite this article

[IEEE Style]

Guozhuang and L. H. Tian, "Novel Single-inductor Multistring-independent Dimming LED Driver with Switched-capacitor Control Technique," Journal of Power Electronics, vol. 19, no. 1, pp. 1-10, 2019. DOI: 10.6113/JPE.2019.19.1.1.

[ACM Style]

Guozhuang and Liang Hanlei Tian. 2019. Novel Single-inductor Multistring-independent Dimming LED Driver with Switched-capacitor Control Technique. Journal of Power Electronics, 19, 1, (2019), 1-10. DOI: 10.6113/JPE.2019.19.1.1.