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.
Highlights
Almost a fifth of global electricity consumption is reserved for the lighting system [1]
In the USA, more than 200 billion kWh each year are expected for lighting systems, and the forecast confirms that the demand is going to increase in the decade [2]
In order to deal with these issues, many governments have already forbidden the trade of incandescent lamps and, on the other hand, encouraged the employment of light-emitting diodes (LEDs)
Summary
In the USA, more than 200 billion kWh each year are expected for lighting systems, and the forecast confirms that the demand is going to increase in the decade [2] Traditional lighting equipment, such as incandescent lamps, florescent lamps and tungsten lamps, are environmental unfriendly, due to low efficiency or, in some cases, due to toxic substances that may contribute to the increase in ambient pollution levels [3]. In order to deal with these issues, many governments have already forbidden the trade of incandescent lamps and, on the other hand, encouraged the employment of light-emitting diodes (LEDs) They have been widespread both in private and public lighting systems thanks to their high luminous efficacy, long lifespan, high reliability and environmental friendliness [4]. It must guarantee a high power factor (PF), and an input current with low total
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call