Solar LED street lights are composed of solar cells, batteries, controllers, LED lights and their constant current drive circuits, as shown in Figure I. Solar panels are usually installed on the top of the light pole and facing the sun, the controller and lead-acid batteries are placed in the control box, and the constant current drive circuit and LED are installed in the lamp. This article discusses the key issues in the use of the above five major components and gives data, and finally introduces the actual use circuit of the constant current drive source.
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