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

Author

Listed:
  • 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)

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.

Suggested Citation

  • Mahmoud Nassary & Mohamed Orabi & Manuel Arias & Emad M. Ahmed & El-Sayed Hasaneen, 2018. "Analysis and Control of Electrolytic Capacitor-Less LED Driver Based on Harmonic Injection Technique," Energies, MDPI, vol. 11(11), pages 1-18, November.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:11:p:3030-:d:180552
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    Citations

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    Cited by:

    1. Claudio Adragna & Giovanni Gritti & Santi Agatino Rizzo & Giovanni Susinni, 2021. "Distortion Due to the Zero Current Detection Circuit in High Power Factor Quasi-Resonant Flybacks," Energies, MDPI, vol. 14(2), pages 1-26, January.
    2. Claudio Adragna & Giovanni Gritti & Angelo Raciti & Santi Agatino Rizzo & Giovanni Susinni, 2020. "Analysis of the Input Current Distortion and Guidelines for Designing High Power Factor Quasi-Resonant Flyback LED Drivers," Energies, MDPI, vol. 13(11), pages 1-24, June.

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