Principle and design of solar photovoltaic LED lighting system

With the intensification of the world's energy crisis and the advent of the fossil energy crisis era, energy use costs are facing upward pressure. All countries in the world are seeking ways to solve the energy crisis. One path is to seek the use of new energy and renewable energy. The other is to seek new energy-saving technologies, reduce energy consumption, and increase energy efficiency.

Solar energy is the most direct, common, and cleanest energy source on the planet. Solar energy, as a huge renewable energy source, can be said to be inexhaustible and inexhaustible.

Solar photovoltaic LED lighting system constitutes an energy-efficient solar photovoltaic LED lighting system including solar battery packs, DC-DC converters, MPPT fMaximum power point tracking control, battery storage and LED lighting control, LED light sources And so on.

Combination of solar energy and LED energy-saving lamp lighting

The basic principle of the solar LED automatic lighting system is that in the case of light, the solar panel converts light energy into electrical energy to charge the battery, and stores the electrical energy in the battery. At night, the energy in the battery charges the semiconductor light-emitting diode LED to illuminate. The system adopts a fully-automatic working method without human intervention. It can use sound, light or delay control methods to ensure that “people are in bright lights and people go out lights” (referring to corridors, corridors, etc.) or “g Turn off the lights (referring to roads, yards, attractions, etc.) or 24 hours a day, "every day does not destroy" (refers to underground parking, tunnels, etc.). For continuous rainy days, the system can work normally for a set number of days (5-7 days). The lighting system device is the most direct and most economical combination of a new generation of energy (solar energy, wind energy, etc.) and a new generation of light sources (semiconductor LEDs) in the 21st century.

During the daytime, from outside the house, it looks like a floor shutter, but it is made of solar panels. The solar panels on the opposite side (outside the house) store electricity during the day and the front (inside) LEDs illuminate the night.

The front (inside) LED light is designed as a pattern of several lamps so that it does not appear that the light bulb of the lamp is emitting light, but that the entire light is on.

The principle of solar photovoltaic cell power generation is photovoltaic effect. For crystalline silicon solar cells, the typical value of open circuit voltage is 0.5-0.6 V. The more electrons and hole pairs generated by light irradiation in the interface layer, the greater the current formed. The more light energy absorbed by the interface layer, the greater the same current. Currently used and researched solar cells are mainly silicon solar cells, compound semiconductor cells, and dye-sensitized solar cells. Silicon solar cells are currently the mainstream of solar photovoltaic cells. In silicon solar cells, the photoelectric conversion efficiency of monocrystalline silicon solar cells is the highest, the laboratory conversion efficiency is over 24%, and the efficiency of monocrystalline silicon solar cells produced on an industrial scale reaches 18%. the above. Thin-film solar cells have been greatly developed in recent years, and new solar cells such as polysilicon/microcrystalline silicon thin-film solar cells have also been industrialized, and the highest conversion efficiency has reached 16%. In recent years, research into compound semiconductor solar cells such as CIS, CIGS thin-film solar cells, and GaAs solar cells has also made practical progress. Dye-sensitized solar cells have also achieved remarkable results.

The key to the perfect combination of solar photovoltaic technology and LED lighting is that both of them are direct current, low voltage and can match each other. Therefore, the combination of the two does not need to convert the direct current generated by the solar cell into alternating current, thereby greatly improving the efficiency of the entire lighting system. At the same time, the advantages are even more obvious with the aid of grid-connected technologies or the use of batteries to store and dissipate energy. With the in-depth research of related technologies, LED's luminous efficiency is constantly improving, ultra-high brightness LED will come out, will inevitably replace the general lighting electric light source, and save a lot of energy and no pollution.

Because the LED's operating current is DC, and the operating voltage is low. Solar cells convert light energy into DC power, and solar cell modules can be combined in series and parallel to get the actual voltage needed. These characteristics are exactly matched with the LED. The combination of the two will achieve high energy efficiency, high safety performance and reliability, and achieve energy-saving, environmentally-friendly, safe, and efficient lighting systems, achieving a very perfect combination.