High-efficiency LED driver for street light applications

In this paper, a novel single-stage parallel topology power circuit is presented. It can be used in LED street lights for widely power range, from 80 W to 300 W. This topology contains two control methods. One is the constant-voltage feedback, and the other is the constant-current feedback. With this design, this power circuit can provide LED a stable constant current. Besides good stability in linear dimming, it solves the power limit issue (up to 150 W) of the conventional discontinuous conduction mode single-stage Flyback converter. The efficiency, power factor, and cost of the new topology are better than the conventional two-stage topology. The experimental results for a 210 W LED street light demonstrate the excellent circuit performance.