The generation of LED lighting has a milestone in the field of lighting. With the increasing energy consumption demand in the world, the storage of major energy resources in the world, such as oil, natural gas and coal, is gradually decreasing. According to the current mining speed, oil and natural gas have only 40 years and 60 years of recoverable reserves respectively. The search for new and renewable energy sources and the development of energy-efficient technologies have received worldwide attention. Solar photovoltaic LED lighting is a typical application of new energy and energy-saving technologies. Solar photovoltaic power converts solar energy from nature into electrical energy and provides it to LED light sources. Due to the low voltage, energy saving and long-lasting characteristics of LED light sources, the application of solar LED lighting systems will achieve high energy efficiency, operational reliability and practical value. Therefore, the research on the control technology of solar photovoltaic power generation lighting system has received attention from all aspects.
The principle of energy saving of solar LED lamps
Solar photovoltaic power LED lighting system constitutes high-efficiency energy-saving solar photovoltaic LED lighting system including solar battery, DC-DC converter, maximum power tracking MPPT fMaximum power point tracking) control, storage battery and LED lighting control, LED light source And so on.
The working principle of the solar photovoltaic lighting system is: in the period of sunlight, the solar battery converts the collected solar energy into electric energy; under the control of the control system, the solar photovoltaic cell maximum power tracking (MPPT) mode is adopted. The electrical energy is stored in the battery pack; when the LED lighting system requires electrical energy, it provides a safe and efficient voltage and current to the LED illumination source. The LED lighting system works energy-efficiently and efficiently, providing clean and environmentally friendly green lighting for people's work and life.
Solar photovoltaic solar photovoltaic power generation is one of the main ways to use solar energy.
The principle of solar photovoltaic cell power generation is the photovoltaic effect. For crystalline silicon solar cells, the typical value of the open circuit voltage is 0.5 0.6 V. The more electron-hole pairs generated by the light in the interface layer, the larger the current is formed. The more light energy absorbed by the interface layer, the greater the current is also formed. The solar cells currently applied and studied mainly include silicon solar cells, compound semiconductor cells, and dye-sensitized solar cells. Silicon solar cells are the mainstream of solar photovoltaic cells. In silicon solar cells, monocrystalline silicon solar cells have the highest photoelectric conversion efficiency, laboratory conversion efficiency of more than 24%, and industrial-scale production of monocrystalline silicon solar cells with an efficiency of 18%. the above. Thin-film solar cells have been greatly developed in recent years, and new types of solar cells such as polysilicon/microcrystalline silicon thin film solar cells have also been industrialized on a large scale, with a maximum conversion efficiency of more than 16%. In recent years, research on compound semiconductor solar cells such as CIS, CIGS thin film solar cells, and GaAs solar cells has also progressed in practical use. Research on dye-sensitized TiO solar cells has also achieved remarkable results.
There is nonlinearity and variability between the output voltage and current of the solar cell. There is a maximum power output point in a particular environment, as well as the voltage and current corresponding to the maximum power point. When the environment changes, the output characteristic curve of the solar cell also changes, and there is a close relationship between the output voltage of the solar cell and the output current. In order to obtain as much electrical energy as possible from a solar cell, the maximum power tracking problem of the solar cell is proposed. Common methods for maximum power point tracking control include constant voltage tracking method, disturbance observation method, conductance increment method, fuzzy logic control method, load current/voltage optimization method, and the like. The method of operating the overall LED current can be driven by constant current and constant voltage. According to the volt-ampere characteristics of the LED, in the forward conduction region of the LED, a small voltage fluctuation causes a large change in current, so the use of constant current driving is a preferred solution.
LED light principle and phosphor improvement technology
The principle of LED illumination. The LED is made of a III-V compound such as GaAs (gallium arsenide), GaAsP (gallium arsenide), A1GaAs (aluminum gallium arsenide), etc., and its core is a PN junction, so it has a general PN junction. Volt-ampere characteristics, namely forward conduction, reverse cutoff, and breakdown characteristics. When the P-type semiconductor and the N-type semiconductor are combined, there is a difference in carrier concentration existing at the interface. Thus, electrons and holes diffuse from the high concentration region to the low concentration region. Thus, one side of the P region loses a hole and a negative ion that cannot move, and one side of the N region loses electrons and leaves a positive ion that cannot move. These charged particles that cannot move are space charges. The space charge is concentrated near the interface between the P and N regions, forming a very thin space charge region, which is the PN junction. When a positive voltage is applied to the PN junction. This changes the dynamic balance of the PN junction. When the injected minority carriers (small children) are combined with the majority carriers (multiple sub-), the excess energy is released as light, thereby directly converting the electric energy into light energy. If a reverse voltage is applied to the PN junction, minority carriers (less children) are difficult to inject, so they do not emit light.
Outdoor decorative LED mesh curtain screen is the perfect architectural decoration patterns in the daytime and night. And it becomes Led Display Screen to display image and video at night;Outdoor decorative Led Curtain Screen is ultra light weight design, which is easy to install. The convenient installation help everyone can install it easily by oneself. It can be packaged in one CMB which is save a lot in transportation. It is not only good for transport but also good for maintenance. Front and back maintain are available due to its special design;LED curtain mesh screen can be installed directly on the wall or glass. The hollow design makes permeability up to 70% which is conducive to ventilation and lighting. The exquisite appearance is good for decoration of shopping mall, hotel, office building and 5s shop etc;The frame shell save install material can be fixed easily. High-intensity sealed lamp with high quality up to IP67 protection level.
It is not only good for transport but also good for maintenance. Front and back maintain are available due to its special design.LED curtain mesh screen can be installed directly on the wall or glass. The hollow design makes permeability up to 70% which is conducive to ventilation and lighting. The exquisite appearance is good for decoration of shopping mall, hotel, office building and 5s shop etc.
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