】 【Solar street light LED weak School Working Principle and Design.

<br> Introduction: With the increasing world energy crisis, countries are seeking to solve the energy crisis, a road is to seek new energy and renewable energy use; the other is to seek new energy-saving technology, reducing energy consumption, .improve energy efficiency. .<BR> <BR> The most direct solar energy is the most popular on the planet is the most clean energy, renewable solar energy as a massive, daily radiation to reach Earth's surface is approximately equal to 2.5 millions of barrels of oil, can be said to take the .endless, inexhaustible. .LED spectrum is almost all concentrated in the visible light spectrum, so the luminous efficiency is high, most people believe that energy-saving lamps can save energy 4 / 5 is a great initiative, but also energy saving lamp LED than 1 / 4, which is a solid light source greater .reform. .Solar LED Lighting <BR> <BR> integrates the advantages of solar energy and LED. .<BR> <BR> This paper a high-power LED street lamp made of solar depth and detail, as shown in Figure 1. .<BR> <BR> 1, the system introduces the basic components <BR> <BR> 1.1 Introduction <BR> <BR> system shown in Figure 2, the system consists of components in solar cells (including bracket), LED lamp, the control box (the .a controller, batteries) and the poles of several parts; luminous efficiency of solar panels to 127Wp/m2, efficient, wind-resistant design of the system is very favorable; head part of the white LED and 1W to 1W LED integrated in the printed yellow .Arrange for a certain distance between the circuit board as planar light source lattice. .<BR> <BR> Control box enclosure with stainless steel as a material, beautiful and durable; control box placed on maintenance-free lead-acid batteries and charge-discharge controller. .The system selected valve-regulated lead-acid batteries, because of its minimal maintenance, it is also known as "maintenance-free battery" will help reduce the cost of system maintenance; charge and discharge controller is designed to take into account the full-featured (with photo .control, time control, overcharge protection, over discharge and reverse polarity protection, etc.) and cost control, to achieve a very high price. .<BR> <BR> 1.2 <BR> <BR> system works introduce the working principle is simple, the use of photovoltaic solar cells made of the principle effect of solar panels during the day and to receive solar radiation into electrical energy output, through charge and discharge controller .stored in batteries at night when the illumination gradually reduced to 10lux about solar panels, open circuit voltage of about 4.5V, charge and discharge controller to detect movement of the voltage value, the battery on the caps discharge. .8.5 hours of battery discharge, the charge and discharge controller action, the end of battery discharge. .Charge and discharge controller's main role is to protect the battery. .<BR> <BR> 2, system design <BR> <BR> the design of solar lights and solar lighting in general compared to the same basic principle, but the need to consider links more. .The following will be the Neo-Neon Holdings Ltd. Hong Kong, this solar power LED lights, for example, in several areas for analysis. .<BR> <BR> 2.1 <BR> <BR> selection of solar modules design requirements: the Guangzhou area, the load input voltage 24V power 34.5W, daily working hours 8.5h, to ensure that the number of consecutive rainy days, 7 days. .<BR> <BR> ⑴ Guangzhou last two decades the average annual radiation 107.7Kcal/cm2, by simple calculation, the peak sunshine hours in Guangzhou is about 3.424h; <BR> <BR> ⑵ == 12.2 load on power consumption .AH <BR> <BR> ⑶ solar modules required for the total charge current = 1.05 × 12.2 × ÷ (3.424 × 0.85) = 5.9A <BR> <BR> here, between two consecutive rainy days the design of the shortest .days for 20 days, 1.05 for the solar cell module system integrated loss coefficient, 0.85 for the battery charging efficiency. .<BR> <BR> ⑷ total power of solar modules at least the number of = 17.2 × 5.9 = 102W <BR> <BR> selected peak output power 110Wp, a single block 55Wp standard battery components, should be able to ensure the street system in the year .In most cases the normal operation. .<BR> <BR> 2.2 Battery Selection <BR> <BR> calculated design capacity of the battery compared to the peak wattage of solar modules to be simple. .<BR> <BR> Calculated according to the above that, the load on power consumption 12.2AH. .In the case of the battery is full, can work seven rainy days, coupled with the work of the first night, the battery capacity: <BR> <BR> 12.2 × (7 +1) = 97.6 (AH), use 2 sets 12V100AH the .batteries to meet the request. .<BR> <BR> 2.3 solar modules angle bracket <BR> <BR> 2.3.1 <BR> <BR> designed to make solar modules in the year received solar radiation as much as possible, .We have to choose the best solar cell module angle. .<BR> <BR> Best angle on the solar cell module of the problem, a number of academic journals in recent years there was a lot. .The lights use areas in Guangzhou, according to this design reference data in the literature [1], the selected stent inclination of solar modules 16o. .<BR> <BR> 2.3.2 Design <BR> <BR> in the solar wind street light system, the structure of a very important issue is the need to wind-resistant design. .Wind-resistant design is divided into two blocks, one for battery components stent wind-resistant design, two for the poles of the wind-resistant design. .The following two were done according to the above analysis. .<BR> <BR> ⑴ solar wind component stent design <BR> <BR> battery components manufacturers based on technical parameters of the information, solar modules can withstand wind pressure as 2700Pa. .If the wind factor selected for the 27m / s (equivalent to ten typhoons), according to non-viscous fluid, battery components to withstand the pressure only 365Pa. .Therefore, the component itself is completely under 27m / s wind speed and will not destroy the the. .Therefore, the design of key components to consider is the battery bracket and pole connections. .<BR> <BR> Lights in the set of system components support the design of the battery connection poles designed for use with the rod bolts fixed connection. .<BR> <BR> ⑵ street light pole in the wind-resistant design parameters are as follows <BR> <BR> lights: <BR> <BR> solar panel angle A = 16o Pole height = 5m <BR> <BR> design selected .pole at the bottom of the poles weld width δ = 4mm diameter = 168mm <BR> <BR> the bottom of Figure 3, the weld surface of the light pole where the failure surface. .Failure surface resistance moment W pole calculation point P to the role of the poles of the battery plates by the role of the line load F distance PQ = [5000 + (168 +6) / tan16o] × Sin16o = 1545mm = 1.545m. .Therefore, the wind load effect of surface damage in the pole moment M = F × 1.545. .<BR> <BR> Under 27m / s maximum allowable wind speed design, 2 × 30W dual-lamp solar street lamp solar panels of the basic load of 730N. .Consider the safety factor of 1.3, F = 1.3 × 730 = 949N. .<BR> <BR> Therefore, M = F × 1.545 = 949 × 1.545 = 1466N.m. .<BR> <BR> The mathematical derivation, annular sliding surface resistance moment W = π × (3r2δ +3 rδ2 + δ3). .<BR> <BR> Above formula, r is the ring diameter, δ is the ring width. .<BR> <BR> Failure surface resistance moment W = π × (3r2δ +3 rδ2 + δ3) <BR> <BR> = π × (3 × 842 × 4 +3 × 84 × 42 +43) = 88768mm3 <BR> <BR> = 88.768 × 10 - .6m3 <BR> <BR> the role of wind load moments in the destruction caused by surface stress = M / W <BR> <BR> = 1466 / (88.768 × 10-6) = 16.5 × 106pa = 16.5Mpa <<215Mpa <BR .> <BR> which, 215Mpa is the bending strength of steel Q235. .<BR> <BR> Therefore, the design meet the requirements of the selected weld width, as long as the welding quality can be guaranteed, the poles of the wind is no problem. .<BR> <BR> 2.4 Controllers Solar Charge Controller <BR> <BR> main role is to protect the battery. .Basic functions must have overcharge protection, over discharge protection, light control, time control and anti-reverse and so on. .<BR> <BR> Battery against over charge, over discharge protection voltage general parameters in Table 1, when the battery voltage reaches the set value after the change in state of the circuit. .<BR> <BR> In the selection of devices, are currently using SCM, but also by the comparator, the program more, have their own characteristics and advantages, should be based on the needs of customers corresponding characteristics of the selected program, in which different .a detail. .<BR> <BR> 2.5 <BR> <BR> surface electrostatic painting of the series of products using new technologies to FP-based paint professional building materials, the surface color of the product to meet customer and environmental requirements of coherence, while products from .clean high, strong corrosion resistance, aging resistance, suitable for any climate and environment. .Design process based on hot-dip zinc coating, greatly improved the product performance to achieve the most stringent requirements AAMA2605.2005, other indicators have met or exceeded the relevant requirements of GB. .<BR> <BR> 3, Conclusion <BR> <BR> basically takes into account the overall design of all aspects; peak watt PV modules and battery capacity by the number of type design type design using the most common design method .design more scientific; wind-resistant design support from the battery components were analyzed with two poles, a more comprehensive analysis; surface treatment using the most advanced process technology; lights the whole structure is simple and beautiful; after the actual operation proves that all sectors .better matching between. .<BR> <BR> Present, solar LED lighting, the initial investment is still a major problem plaguing us. .However, optical efficiency of solar cells gradually increased, and prices will gradually decrease, the same LED light effect on the local market improving rapidly, but prices are lower. .And solar and renewable, clean pollution-free and environmentally friendly energy saving LED's compared to conventional fossil energy has become tighter, and after use on the environment will cause a serious and growing pollution. .Therefore, solar LED lighting, outdoor lighting as an ascendant, to show to us will be the endless vitality and broad prospects. .<BR> <BR> <BR> <BR>.