Solar LED Street Light

Appian has successfully produced the control electronics for a solar powered, LED street light.

The unit combines 3 main functions: a maximum power point tracking (MPPT) battery charger, a constant current LED driver and the control microprocessor with Zigbee wireless interface.

The MPPT charger adjusts the output charge current to maintain the optimum input voltage from the solar cell to extract the maximum available power.

The microprocessor monitors all the voltage and current paramaters of the system and adjusts the LED drive current to assure the LEDs run for the duration of darkness. The system has a Zigbee wireless mesh network function to enable control and status information to be passed between street lights on the network. It is also possible to perform an update of the firmware over the air.

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