Proposal of a low-cost LED driver for a multistring street lighting luminaire

This paper proposes a very low-cost circuit to drive a multistring LED-based luminaire which can be employed in street lighting. The circuit is based on a DCM buck-boost power factor corrector stage and four simple linear current equalizers which feed four LED strings. Though very simple and employing a linear technique to balance current on the output, the luminaire has a fair efficiency at full power, with high input power factor and very low input current distortion. Experimental results with a 176 W prototype are presented to validate the concept.