Analysis and Control of Electrolytic Capacitor-Less LED Driver Based on Harmonic Injection Technique

Mahmoud Nassary, Mohamed Orabi, Manuel Arias, Emad M. Ahmed and El-Sayed Hasaneen
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Mahmoud Nassary: APAERC, Faculty of Engineering, Aswan University, 81542, Aswan, Egypt
Mohamed Orabi: APAERC, Faculty of Engineering, Aswan University, 81542, Aswan, Egypt
Manuel Arias: Departamento de Ingeniería Eléctrica, Electrónica, de Computadores y Sistemas University of Oviedo, 33204 Gijón, Spain
Emad M. Ahmed: APAERC, Faculty of Engineering, Aswan University, 81542, Aswan, Egypt
El-Sayed Hasaneen: APAERC, Faculty of Engineering, Aswan University, 81542, Aswan, Egypt

Energies, 2018, vol. 11, issue 11, 1-18

Abstract: AC-DC LED drivers may have a lifespan shorter than the lifespan of LED chips if electrolytic capacitors are used in their construction. Using film capacitors solves this problem but, as their capacitance is considerably lower, the low-frequency ripple will increase. Solving this problem by limiting the output ripple to safe values is possible by distorting the input current using harmonic injection technique, as long as these harmonics still complies with Power Factor Regulations (Energy Star). This harmonic injection alleviates the requirements imposed to the output capacitor in order to limit the low-frequency ripple in the output. This idea is based on the fact that LEDs can be driven by pulsating current with a limited Peak-To-Average Ratio (PTAR) without affecting their performance. By considering the accurate model of LEDs, instead of the typical equivalent resistance, this paper presents an improved and more reliable calculation of the intended harmonic injection. Wherein, its orders and values can be determined for each input/output voltage to obtain the specified PTAR and Power Factor (PF). Also, this harmonic injection can be simply implemented using a single feedback loop, its control circuit has features of wide bandwidth, simple, single-loop and lower cost. A 21W AC-DC buck converter is built to validate the proposed circuit and the derived mathematical model and it complies with IEC61000 3-2 class D standard.

Keywords: pulsating output current; light emitting diode (LED); peak to average ratio (PTAR); power factor correction; harmonic injection; modelling; feedback loop control (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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