LED lighting principle and application of energy-saving

Generation of LED lighting in the lighting field, the significance of the milestone. With the contemporary world's major energy resources of the world's growing demand for energy consumption, petroleum, natural gas, coal storage capacity is gradually reduced in accordance with the speed of mining, oil and natural gas, respectively, only 40 years and 60 years of mineable reserves. Seeking the use of new energy and renewable energy, the development of energy-efficient technologies, by universal attention worldwide. Solar photovoltaic LED lighting is a typical application of new energy and energy-saving technologies. Solar photovoltaic conversion of solar energy in nature for the electrical energy supplied to the LED light source. Due to the low voltage of the LED light source, energy-saving and long-lasting features, solar LED lighting systems applications will be able to achieve high energy efficiency, reliability and practical value. Therefore, solar photovoltaic lighting system control technology by the attention.
Principle of generation of energy-saving LED lights
Of solar photovoltaic LED lighting systems solar photovoltaic energy efficient LED lighting systems including solar batteries, DC-DC converter, the maximum power point tracking MPPT fMaximum power point tracking) control, store electrical energy storage battery and LED lighting control, LED light source and other parts.
Solar photovoltaic lighting system works: sunlight periods, the solar array will be collected solar energy into electrical energy; Solar Photovoltaic Maximum Power Tracking (MPPT) under the control of the control system, the electrical energy stored in the battery group; LED lighting systems require electricity supply, the voltage and current to the LED light source to provide a safe and efficient. Energy efficient LED lighting systems work, to provide a clean environment for the people working and living green lighting.
Solar photovoltaic solar photovoltaic cell power generation is one of the main ways of using solar energy.
The power inverter generation principle of the solar photovoltaic cell is light-voltaic effect for crystalline silicon solar cells, a typical value is of the open-circuit voltage 0.5 0.6 V, the electron-hole pairs generated by the light in the interface layer more, the greater the resulting current. More absorb the light energy of the interface layer formed in the same manner as the current is greater. Application and research of the solar batteries are mainly silicon solar cells, compound semiconductor cell, and a dye-sensitized solar cell. Silicon solar cells is the mainstream of solar photovoltaic cells, silicon solar cells with the highest photoelectric conversion efficiency of monocrystalline silicon solar cells, the laboratory conversion efficiency of more than 24% of industrial-scale production of monocrystalline silicon solar cell efficiency of 18% or more. Thin film solar cells in recent years has been a great development, polysilicon} crystalline silicon / microcrystalline silicon thin film solar cells and other new types of solar cells also scale industrialization, the highest conversion efficiency of more than 16%. In recent years, of CIS, CIGS thin-film solar battery, GaAs solar cells and other compound semiconductor solar cell has also been made practical progress. The dye-sensitized TiO solar cell research has also made notable achievements.
Exists between the non-linearity, and variability in the output voltage and current of the solar cell. There is a maximum 'power output point, and the voltage corresponding to the maximum power point of one and the current in a particular environment. When the environment changes, the output characteristic curve of the solar panel  also changes. The characteristic curve of the output voltage and output current of the solar cell of Figure 2 in order to get as much power from the solar cell, the maximum power point tracking of the solar cell. The common method of maximum power point tracking control constant voltage tracking method, perturbation and observation method, incremental conductance method, fuzzy logic control method, the method of load current / voltage method entire LED current constant current driver and constant current driver . According to the volt-ampere characteristics of the LED, the the LE D forward pass District tiny voltage fluctuations can cause great changes of the current constant current drive scheme is to be elected.
LED lighting artistic performance
LED light-emitting principle. LED Ⅲ-V compound, such as GaAs (gallium arsenide), GaAsP (gallium arsenide phosphide) AlGaAs (aluminum gallium arsenide) semiconductor is made at its core is a PN junction, so it has a general PN junction The volt-ampere characteristic, that is, the forward pass, reverse-blocking breakdown characteristics. When the P type semiconductor and N-type semiconductor combined, since the carrier concentration at the interface exists difference. Thus, the electron and the hole will be from a high concentration area to a low-concentration region diffusion. The P zone on one side lose the hole remaining negative ions can not move, the the N region side lose electrons and positive ions leave can not move. These charged particles can not move is the space charge. The space charge is concentrated in the vicinity of the interface of the P and N regions, the formation of a space charge region of a very thin, grid tie inverter is a PN junction. When a positive voltage to the P-N junction. Changed the dynamic equilibrium of the P-N junction. When the composite of the minority carrier injection (minority) and majority carrier (multi-sub), put the excess energy is released in the form of light, which converts electrical energy directly into light. PN junction reverse voltage, minority carriers (minority) injection is difficult, it is not light.