Vol.7, No.2, May 2018.                                                                                                                                                                             ISSN: 2217-8309

                                                                                                                                                                                                                eISSN: 2217-8333


TEM Journal



Association for Information Communication Technology Education and Science

Comparison of Power Converters for LED Illuminants


Vencislav C. Valchev, Daniela J. Mareva, Dimitar D. Yudov, Nikolay L. Hinov


© 2018 Vencislav C. Valchev, published by UIKTEN. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License. (CC BY-NC-ND 4.0)


Citation Information: TEM Journal. Volume 7, Issue 2, Pages 398-404, ISSN 2217-8309, DOI: 10.18421/TEM72-22, May 2018.


Received: 21 November 2017
Accepted: 25 April 2018
Published: 25 May 2018




The purpose of the paper is to investigate the various modulation types for control of transformerless non-dimmable AC/DC/DC converters in nominal operation mode intended for LED illuminants. A combined PWM (pulse width modulation) is investigated. The optimal selection of power converter inductor core is considered. The derived results lead to conclusions for improvement of the power converter characteristics. Furthermore, the DC link capacitor is reduced without significant effect on circuit performance. It is proven that utilizing combined PWM would result in less current ripple and improved power factor. Utilization of nanocrystalline materials additionally reduces losses in the examined power converter. 


Keywords –light-emitting diode driver, PWM control, buck converters, nanocrystalline materials.



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