On the use of a low frequency boost rectifier as a high power factor LED driver

This paper presents a discussion about the use of a low frequency boost pre-regulator as an LED driver. This kind of very simple converter may provide high power factor, low input current distortion and even standards compliance. A mathematical description of relevant equations is provided and an experimental study applied to a low power, low output voltage desktop luminaire is presented. Preliminary results show that it is possible to design a high power factor low cost LED driver with no need of electrolytic capacitors, what may confer an extended lifetime to the lighting fixture. Due to the discontinuous nature of LED current, a decrement of 10% in the luminous efficacy of LED elements has been measured. Moreover, the equipment has featured an efficiency of 59%, mainly due to the required use of a low frequency transformer. Similar low frequency and high power factor LED drivers have been also studied and presented here, and are mainly focused to street lighting applications. In this case no transformers are required at all, what may define much higher converter efficiency.

[1]  G. Spiazzi,et al.  A double-line-frequency commutated rectifier complying with IEC 1000-3-2 standards , 1999, APEC '99. Fourteenth Annual Applied Power Electronics Conference and Exposition. 1999 Conference Proceedings (Cat. No.99CH36285).

[2]  Mi-Ching Tsai,et al.  An asymmetric PWM for low switching frequency power factor correction circuit , 2008, 2008 IEEE International Conference on Industrial Technology.

[3]  E. L. Corominas,et al.  A Study on LED Retrofit Solutions for Low-Voltage Halogen Cycle Lamps , 2012 .

[4]  Fernando J. Nogueira,et al.  An experimental study on the photometrical impacts of several current waveforms on power white LEDs , 2011, XI Brazilian Power Electronics Conference.

[5]  Simone Buso,et al.  Comparison among high-frequency and line-frequency commutated rectifiers complying with IEC 61000-3-2 standards , 2000, Conference Record of the 2000 IEEE Industry Applications Conference. Thirty-Fifth IAS Annual Meeting and World Conference on Industrial Applications of Electrical Energy (Cat. No.00CH37129).

[6]  Wu Chen,et al.  A Novel Passive Offline LED Driver With Long Lifetime , 2010, IEEE Transactions on Power Electronics.

[7]  M. Kimata,et al.  New switching method for single-phase AC to DC converter , 1993, Conference Record of the Power Conversion Conference - Yokohama 1993.