Abstract-Light emitting diode (LED) is now widely used in
many fields including traffic lights, vehicle backlights and
liquid crystal display (LCD) displays because of their long life,
good illumination efficiency and low energy consumption. For
the high power LED street lamp, a low operating temperature
is essential for LED chips. However, it's waste and meaningless
to increase the size of heat sink for high power LED street
lamp immoderately. In this paper, structure optimization of
heat sink is studied on the condition that the heat sink is
sufficient for cooling demand of 196W LED street lamp. 117,
217 and 317 length diminution of the heat sink are studied
respectively. Results show that temperature of plate surface is
increased 16°C with 317 bulk and weight reducing. And crosssectional
shape optimization of fin is also studied. The result
show that the bulk and weight of fins are reduced over 50%
with only 0.42°C temperature rise. The results of this work
provide useful guidelines for thermal management of the heat
sink without affecting the cooling demand of high power LED
street lamp.
Keywords- high power LED street lamp; heat sink; structure
optimization; thermal management;