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 that convert solar energy from nature into electrical energy and provide 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 LED lighting energy saving
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 cell 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 solar cells such as polysilicon}crystalline silicon/microcrystalline silicon thin film solar cells have also been industrialized on a large scale, with the highest 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, and a voltage and current corresponding to the maximum power point. When the environment changes, the output characteristic curve of the solar cell also changes. The characteristic curve of the output voltage and output current of the solar cell is shown in Fig. 2. In order to obtain as much electric energy as possible from the solar cell, the maximum power tracking problem of the solar cell is proposed. The common methods of maximum power point tracking control are constant voltage tracking method, disturbance observation method, conductance increment method, fuzzy logic control method, load current/voltage maximum method, etc. The whole LED operating current can be driven by constant current driving and constant voltage driving. . According to the volt-ampere characteristics of the LED, in the forward conduction region of the LE D, a small voltage fluctuation causes a large change in current, so the constant current drive is an option.
LED lighting artistic concrete performance
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.
The main implementation of white LEDs. At present, GaN-based LEDs are mainly obtained by white light: blue LED + yellow phosphor, three-color LED synthetic white light, purple LED + three-color phosphor. The most common way to form white light is to combine a blue LED chip with a phosphor that can be effectively excited by blue light to form a white LED. The LED emits blue light with a peak value of about 470 nm, and some blue light-excited phosphors emit yellow-green light with a peak value of about 570 nm. . Mixing with the blue light from another portion and the yellow-green light generated by the excitation phosphor produces Y l O :Ce white light. Most of the phosphors currently used are rare earth-activated aluminates Y l O :Ce (YAG), which emit yellow-green light when excited by blue light, so it is called yellow-green phosphor. The method has the advantages of high luminous efficiency, simple preparation and mature process. But the color changes with the angle. The light consistency is poor, and the lifetime of the phosphor and the LED are also inconsistent. As time goes by, the color rendering index and color temperature will change, which affects the illuminating quality of the illuminating light source. White light is realized by mixing three primary color LED chips of red, green and blue or three primary color LED tubes. The former is a three-chip type, and the latter is a three-lamp type. The red, green and blue LEDs are packaged in one tube, and the luminous efficiency can reach 20 lm/W. The luminous efficiency is high and the color rendering is good [31. However, the shortcoming of this synthetic white light method is that the LED driving circuit is more complex. The three-chip type three primary color mixing cost is high, and since the light decay characteristics of the three types of red, green and blue LEDs are inconsistent, the mixing ratio of the three colors changes as the use time increases. The color rendering index will also change the ultraviolet or violet LED to excite the three primary color phosphors, producing white light. This method makes it easier to obtain white light of uniform color, because the color is determined only by the ratio of the phosphor, and in addition, a high color rendering index can be obtained. But the biggest difficulty is how to get high conversion efficiency of three-color phosphors, especially high-efficiency red phosphors. It is also important to prevent UV leakage.
Along with the rapid development of China's economy and the rapid expansion of population size, the consumption of energy is increasing. The development of cities is closely followed by high energy consumption. The contradiction between supply and demand of energy is increasingly prominent, and energy shortage will seriously hinder the future development of the city. Semiconductor lighting source is an industry with great market potential. With the advancement of technology. The field of application of semiconductor illumination sources will expand rapidly. In the next 5-10 years, it will become the main force of the lighting industry. It will change people's awareness of lighting. The development of a personalized lighting concept is undoubtedly a revolution in the field of lighting. Simultaneously. We must scientifically analyze and calmly face the historical opportunities brought by semiconductor lighting, and formulate scientific development plans to make semiconductor lighting develop healthily.
XLPE Insulated Al Alloy Interlocked Cable is kind of cable, in which the rare earth high compressed aluminum alloy is used as conductor, and PVC is used as Jacket wound around. The insulation adopts XLPE material, featuring with high stability and flexibility. Outside the inner wrapping is the self-locking armour, which boasts of superior economic performance. The whole structure is designed and manufactured elaborately based on advanced international technology and equipment. This cable removes the defects of aluminum cable systematically. And the great flexibility allows this cable to be bent at the corner. With easy installation, it presents excellent mechanical performance and large circuit transmission capacity.
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Armour: interlocked aluminum alloy armour
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