An efficient ripple-free LED driver with zero-voltage switching for street lighting applications

ABSTRACT

An efficient ripple-free light-emitting diode (LED) driver circuit is proposed with zero-voltage switching (ZVS) and dimming control. The proposed driver circuit utilizes a full-bridge configuration. The LED lamp current is the sum of two inductor currents which are out of phase. This makes the LED lamp current ripple free. Larger portion of lamp power is supplied by the dc voltage source connected in series with LED lamp. Small amount of power is processed by bridge circuit. Devices of the bridge circuit conduct only ripple current of the load inductor and a small current of an inductor which helps in ZVS. Hence, both conduction and switching losses are reduced. In addition, LED lamp current can be regulated at required operating current. The dimming feature is attained by on-off control method. This proposed configuration also helps in reducing components count. An experimental prototype of 87 W has been developed and tested at full load and different dimming levels. Experimental results validate simulation results.

KEYWORDS:

• Driver circuits
• dc-dc power converters
• light emitting diodes (LED)

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Notes on contributors

Kasi Ramakrishnareddy Ch

Kasi Ramakrishnareddy Ch received his B.Tech degree in Electrical & Electronics Engineering from Acharya Nagarjuna University, Guntur, India in 2008 and M.Tech Degree in Industrial Electronics from Sardar Vallabhbhai National Institute of Technology, Surat, India in 2010. He is currently working towards his Ph.D Degree in the Department of Electrical Engineering, National Institute of Technology, Warangal, India. His research interests are switch mode power converters and applications.

S. Porpandiselvi

S. Porpandiselvi received her B.E. Degree in Electrical & Electronics Engineering from Thiagarajar College of Engineering, Madurai, India in 1996, M.E. Degree in Applied Electronics from Madurai Kamaraj University, India in 2001 and Ph.D. Degree in Electrical Engineering from National Institute of Technology Warangal, India in 2014. Currently, she is working as an Assistant Professor in Electrical Engineering Department of National Institute of Technology Warangal, India. Her research interests include high frequency inverters for induction heating applications, Resonant converters, LED driver circuits and PV-based applications.

N. Vishwanathan

N. Vishwanathan received his B.Sc (Engg.), degree in Electrical Engineering from Dayalbagh Educational Institute, Agra, India in 1990, M.Tech, degree in Electrical Machines and Industrial drives from REC, Warangal, India in 1992, and the Ph.D. degree from Indian Institute of Science, Bangalore, India in 2004. He is currently working as a Professor in Electrical Engineering Department of National Institute of Technology, Warangal, India. His areas of interest are Switched Mode Power Conversion and Electrical Drives.