Title: Universal control algorithm for automatic current regulated LED driver

Authors: Vishwanath Gupta; Biswarup Basak; Kamalika Ghosh; Biswanath Roy

Addresses: School of Illumination Science Engineering and Design, Jadavpur University, Jadavpur, Kolkata, 700032, India ' Electrical Engineering Department, Indian Institute of Engineering Science and Technology, Shibpur, Howrah, 711103, India ' School of Illumination Science Engineering and Design, Jadavpur University, Jadavpur, Kolkata, 700032, India ' Electrical Engineering Department, Jadavpur University, Jadavpur, Kolkata, 700032, India

Abstract: In the present work, a universal control algorithm is proposed which automatically regulates the output current of an LED driver as per the connected load requirements. The unique features of the proposed control algorithm is its operability in a wide output power range and remaining unaffected by the unequal current sharing among the LED strings arising due to mismatch among same wattage LED chips. The proposed control algorithm is tested by modelling and simulating an LED driver in MATLAB Simulink to operate LED modules having series-parallel combination of 3 W LED chips in the range of 18 W-72 W. The results obtained from simulation show that the proposed control algorithm successfully regulates the output current of the LED driver according to load requirements. The electrical performance of the simulated LED driver on universal AC supply complies with IEC 61000-3-2:2014 class C regulations and shows significant improvement over previously proposed LED drivers.

Keywords: universal control algorithm; automatic current regulation; LED driver; LED modules; modelling and simulation.

DOI: 10.1504/IJPELEC.2020.108843

International Journal of Power Electronics, 2020 Vol.12 No.2, pp.169 - 190

Received: 20 Aug 2017
Accepted: 21 Feb 2018
Published online: 05 Aug 2020 *

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