Analysis of the Input Current Distortion and Guidelines for Designing High Power Factor Quasi-Resonant Flyback LED Drivers

Claudio Adragna, Giovanni Gritti, Angelo Raciti, Santi Agatino Rizzo and Giovanni Susinni
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Claudio Adragna: Industrial & Power Conversion Division Application Laboratory, STMicroelectronics s.r.l, 20864 Agrate Brianza (MB), Italy
Giovanni Gritti: Industrial & Power Conversion Division Application Laboratory, STMicroelectronics s.r.l, 20864 Agrate Brianza (MB), Italy
Angelo Raciti: Istituto per la microelettronica e microsistemi, Consiglio Nazionale Delle Ricerche, 95121 Catania, Italy
Santi Agatino Rizzo: Department of Electrical, Electronic and Computer Engineering, University of Catania, 95125 Catania, Italy
Giovanni Susinni: Department of Electrical, Electronic and Computer Engineering, University of Catania, 95125 Catania, Italy

Energies, 2020, vol. 13, issue 11, 1-24

Abstract: Nowadays, LED lamps have become a widespread solution in different lighting systems due to their high brightness, efficiency, long lifespan, high reliability and environmental friendliness. The choice of a proper LED driver circuit plays an important role, especially in terms of power quality. In fact, the driver controls its own input current in addition to the LED output current, thus it must guarantee a high power factor. Among the various LED drivers available on the market, the quasi-resonant (QR) flyback topology shows interesting benefits. This paper aims at investigating and analyzing the different issues related to the input current distortion in a QR flyback LED driver. Several effects, such as the distortion caused by the ringing current, crossover distortion due to transformer leakage inductance and crossover distortion due to the input storage capacitor have been experimentally reported. These effects, not previously studied for a high power factor (Hi-PF) QR flyback, have been analyzed in depth. Finally, some practical design guidelines for a Hi-PF QR flyback driver for LED applications are provided.

Keywords: converter control; solid-state lighting; power factor correction; Total Harmonic Distortion; primary sensing regulation; flyback; LED lamp (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: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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