Solar hybrid LED streetlight

Smart Solar Hybrid LED Lighting

This paper presents a smart solar light emitting diode (LED) streetlight solution that work on constant current mode using interleaved boost converter as a primary power converter. The input to power converter is a 12V battery source which is charged by a solar panel. The battery charger is working on maximum power point tracking scheme using commercial microcontroller (STM32F3) from STMicroelectronics. In absence of battery or low charge condition of the battery it automatically switches to constant current AC-DC LED driver. The AC-DC LED driver is working on quasi-resonant mode (QR) based power factor correction (PFC) using single stage single switch with primary sensing proprietary control. The commercial LED driver, HVLED001 is used for driving the LED. The prototype of this LED driver is experimentally verified, manufactured and deployed at STMicroelectronics campus using 30 number of existing poles in an area of 100×150 sq. meters. The conversion efficiency of each stages is more than 90% individually with good power quality and running reliably. The streetlights are connected to each other by a 6LoWPAN mesh network implemented using commercially available Sub-GHz device called SPIRIT1 from STMicroelectronics.