Abstract
Solar LED lamp system uses high efficiency single crystal (multi crystal) silicon solar cell to supply power, uses the storage battery (super capacitor) to store electrical energy, uses efficient LED to light, uses advanced charging and discharging technology and lighting control circuit. It has the advantages of reliable capability, high luminous efficiency, high brightness, convenient installation, without cable wires, without AC power supply, using DC supply, photosensitive control, safety, reliability, energy saving, economic, environmental-friendly, utility (the system can work 3 to 7 days basing on different configuration and model charge), durable (solar cell can be used 15 to 20 years, super capacitor can be used 5 to 7 years), and so on. It is the future direction of outdoor lighting system.
In this thesis, a circuit managing and controlling the photovoltaic power system is designed, which achieves intelligent control of the solar LED lamp system. In the daytime, basing on the photovoltaic effect, the solar battery recharges the storage battery through the charging circuit. At night, light intensity is gradually weak so that the working voltage and the working current of the solar battery continuously reduce. The storage battery drives the LED lamp when the working voltage is less than the setting voltage. While the light intensity is enough intense, the controller cuts the load and recharges the storage battery again. The system works back and forth as above-mentioned.