Intelligent LED solar street light system

With the increasing shortage of traditional energy, the application of solar energy will become more and more extensive, especially the field of solar power generation has developed into a mature sunrise industry in just a few years. At present, road lighting accounts for 25% to 30% of the total lighting power consumption, so road lighting energy saving has great potential and space. At present, the most used road lighting is high-voltage nanometer lamps. This light source has disadvantages such as poor color rendering, long startup time, high power consumption, and large heat generation. It is necessary to develop new and more energy-efficient road lighting sources. High-power and high-efficiency LED is a new light source that has developed rapidly at home and abroad in recent years. It has high luminous efficiency (≥90 lmPW (1W LED)), long life (30000~50000h), vibration resistance, not easy to damage, instant start, no pollution Etc. White LEDs are ideal light sources for general and road lighting. Solar street lights have many advantages: safe and reliable, easy to maintain; do not require conventional energy, do not pollute the environment; can be installed anywhere as needed, without connecting to the public grid. Therefore, the development of LED street lamps has important energy-saving significance. Based on the original solar street light system, this paper proposes and develops a new type of intelligent LED solar street light system. 1. Composition of solar street light system The street light system consists of the following parts: solar panels, booster circuit modules, controller modules, Zigbee communication components, battery packs, and LED light sources. As shown in Figure 1. Figure 1 Rendering and block diagram of the street light The basic working principle of the system: under the control of the solar controller, the solar panel charges the battery pack through two booster circuits (12V to 42V) during the day, and the battery pack provides power to the LEDs at night lamp load. In the control module, real-time control of the booster circuit, battery voltage, temperature, LED light group temperature, and battery board voltage is realized, and the data collected by the analog switch is fed back to the PIC to realize the intelligent control of the street light system. The Zigbee module provides a reliable technical guarantee for the networking of the street light system. 1.1 Solar panels Solar panels are the core part of solar street lights and the most valuable part of solar lights. Its function is to convert the radiant energy of the sun into electrical energy, or send it to the battery for storage. Among the many solar cells, the most common and practical ones are monocrystalline silicon solar cells, polycrystalline silicon solar cells and amorphous silicon solar cells. In areas with sufficient sunlight and good sunshine, it is better to use polycrystalline silicon solar cells, because the production process of polycrystalline silicon solar cells is relatively simple, and the price is lower than that of monocrystalline silicon solar cells. In areas with more cloudy and rainy days and relatively insufficient sunshine, it is better to use monocrystalline silicon solar cells, because the performance parameters of monocrystalline silicon solar cells are relatively stable. Amorphous silicon solar cells are better when there is insufficient sunlight outdoors, because amorphous silicon solar cells have lower requirements for sunlight conditions. In addition, the development of the second generation of solar cells is about to make a breakthrough, and its core component is an adhesive film, that is, a thin film solar cell material. 1.2 Boost circuit module and its battery pack In this system, the solar energy collected by the solar panel charges the battery through two DCDC boost circuits. The Boost circuit is built with LM5022, and the low-voltage self-locking function of the chip itself is used to cleverly control the charging of the circuit. Referring to the relationship between the output voltage of the solar cell and the light, in the evening (about 18:00 in summer and about 17:00 in winter), the output voltage of the solar cell will be lower than the self-locking voltage of the chip (about 1.25V). The control module makes the system stop charging the battery and enter the lighting state.