Solar energy is a clean green energy source. Semiconductor light-emitting diodes ( LEDs ) are also environmentally friendly, energy-saving and efficient solid-state electric light sources. Combining LED technology and solar technology to develop solar semiconductor lighting is the best combination of energy saving and environmental protection. It is the perfect combination of new generation energy and new generation light source. Research and development using solar LED lighting technology will be a strategic decision for the sustainable development of governments around the world, which is of great significance.
The research object of this paper is the processor in the solar LED lighting control system controller. The system realizes the main functions such as management of system working state, management of remaining battery capacity, battery charging, discharge control, switching control of solar battery power and commercial power supply, and semi-power control of LED load. The controller relies mainly on the operation of the processor to achieve the above functions.
1, system composition
The solar LED lighting control system is mainly composed of solar battery, battery, system controller, LED lighting load and mains power supply. The schematic diagram of the system composition is shown in Figure 1. When the system is working normally, the battery supplies power to the LED load. When the battery voltage is insufficient, the utility power (backup power supply) directly supplies power to the LED load, thereby avoiding the situation that the LED load is not bright when the battery voltage is insufficient. With the utility power as a backup power source, the capacity of the battery can be appropriately reduced and the cost can be reduced. At the same time, the waste of utility resources due to the use of solar energy is avoided, and reliability and economic requirements are met.
Figure 1 Schematic diagram of the composition of the solar LED lighting system
When the system works, solar radiant energy is converted into electric energy by solar cells, but since the output of the solar cell is greatly affected by temperature and solar radiation intensity, the output power is unstable, so when the solar radiation intensity is sufficiently large (daytime), it is necessary to use the battery. The converted electrical energy is stored to power the semiconductor lighting load when it is needed for illumination (evening). In the solar semiconductor lighting system, the controller is the core part. When the system is working, the controller controls the working state of the system and manages the charging and discharging process of the battery, so that the system can be stably and reliably under different working conditions. jobs.
The main functions of each component of the system are as follows:
(1) Solar cells. It is made up of many solar cell modules in series and in parallel. The synthesized capacity can be hundreds of peaks (Wp) or several megawatts (Wp) or even larger. The components can be made of single crystal silicon, polycrystalline silicon, amorphous. Silicon or other type of solar cell. In general, photovoltaic arrays are mostly composed of semiconductor devices, and their volt-ampere characteristics are strongly nonlinear.
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