A LED solar street lamps system matching method of design

A LED solar street lamps system matching method of design

LED light for solid to shine, and according to the principle of solid physics principle, LED light spectrum of almost all focused on visible light frequency band, so the luminous efficiency is as high as 90% above, therefore, is known as the 21 st century LED light source, is about to become the new incandescent lamp, fluorescent lamp, high intensity discharge lamp after the fourth generation of light source, is recognized as one of the ten leading technology, LED light source the new lighting source will replace the traditional lighting source, is driving a new industrial revolution-the illumination revolution. According to the world financial crisis, the development and reform commission to take out 4 trillion along with local financial support is expected to have more than 1 O 1 trillion put money into national transportation, support enterprise, perfect infrastructure. Recently in the national ministry of science and technology to start "ten city lamp" LED semiconductor lighting lamps application project, in the east, we always get under strong government support semiconductor lighting industry, is a great development opportunity.

1 system introduction a complete set of LED solar street lamps system includes: LED light source, controller, batteries, solar cell module and light body. During the day, solar cell module will light energy into electrical energy through the controller is stored in the battery, the battery in the evening by controller to light source power supply, make its into light energy, lighting road. Main body lamp up during the day and system protection adornment effect, guarantee the normal operation of the cycle. Which LED light source, and the controller, storage battery is decided to system performance, the key street in the design we must carry on the optimization design, reasonable configuration.

1) system matching problem now do solar lamps and lanterns manufacturers often too much pursuit, and modelling design of the most important system matching design oversight, not after in-depth consideration, a simple calculation, and finally settles in a host of problems appear lamps and lanterns; Some manufacturers to build their own products price advantage, at the expense of the system stability, the action is not advisable. Matching design is related to the system reliability and stability of the important factors, to pay attention, basically should consider the following aspects:

(1) the sun and load capacity of the battery power consumption ratio is reasonable.

(2) power consumption and battery capacity for rainy days ratio should meet the requirements and discharge depth is reasonable.

(3) the sun battery charging electric current and battery capacity reasonable proportion.

(4) load discharge current and battery capacity reasonable proportion.

2) LED street light technical features road lighting aim to provide a vision in the night travelers safe and reliable conditions, high brightness LED lights, and it must be in compliance with the brightness of the existing road conditions, traffic safety must achieve brightness requirements. The luminous efficiency and luminous intensity can achieve the existing road lighting need brightness demand. The road lighting from 1 July 2007, the implementation of the ministry of construction industry standard CJJ45-2006 "urban road lighting design standard, road lighting intensity of illumination requirement to see table 1. In order to make tend to be more perfect, the main design should be to the following for elaborate consider:

(1) the source selection and conventional lighting, LED compared advantages. Low voltage power supply, LED to belong to the insulation demand is not high, do not need transformer, ballast, starters and other accessories, obvious save investment; Simple structure, belong to solid light source, do not need to air, do not need to glass shell, also does not exist, and gas seal impact resistance, resistance to shock, not easy and broken; Leds are cold light source, controllable good, fast response time, can relapse frequently kill bright, not tired; Low energy consumption, long life and so on. LED the lamp is the core of the intelligent design of switch power. Currently use a wide range of LED street light switch power rectifier filter circuit with general, adjusting circuit, sampling circuit, over-current protection circuit and DC constant current output circuit. In high power LED application, heat is another major aspect to consider, at present, the LED in the energy consumption of about 80% above into heat, and semiconductor devices is not high temperature resistant, heat to do bad, will cause serious light failure, some serious half year may drop to the original half in the street lamps, high power LED many is a multiple application must adopt the aluminum alloy series, more than the fin wind) make the radiator.

(2) the choice of battery valve control type sealing lead-acid battery application in our country have had ten DuoNian, since it has small volume, light weight, small self-discharge, long life, saving investment, easy installation, safe and reliable, easy to use, less maintenance not excessive acid mist, no corrosion, no pollution to environment and good qualities, and can realize the unattended and microcomputer monitoring of modern management mode; So the photoelectric lamps, pv engineering a large amount of use. But to understand the meaning of "free maintenance", to ensure the security of the system and reliable.

In use process, of vrla batteries for the maintenance of the need to build a precise charge and discharge system and implement, to make the battery to achieve optimal performance and maximum life. A large amount of research at home and abroad, according to the results of the storage battery charging and discharging mode decided to use life, there are some battery is not so much to use bad, than say charging ways not damaged. Solar lamps and lanterns from the perspective of economy and reliability comprehensive consideration, general with an average annual sunshine hours design calculation, and the actual work with lamps and lanterns, often is the controller in the control function set a reduction in working hours, such as 6 hours, 8 hours, 1 O hours, etc, thus causes a years time every day, that is the same work every day, but the same power consumption solar lamps and lanterns is powered by the sun, and the sun radiation work with different season is a great difference, namely each lamps and lanterns (solar cell module must) each season, the average electricity is very different. The Texas area average annual peak sunshine hours about 4.44 hours to 4.43 hours, spring: summer: 6.1 7, small th inch, autumn: 4.47 hours, winter: 2.65 small day ". A day on average for generating capacity and average peak sunshine is proportional to the real number, so can have to spring and fall generating capacity and power consumption is basic to achieve a balance of power, the summer rich; Winter lack power. This summer has caused some waste, and winter is severity shortage, is very easy to create a discharge influence on the battery, the battery life. For self-discharge, system matching, cost factors is extremely economy and not practical. So control load time is a solution, according to Texas peak sunshine hours available: summer peak sunshine hours than an average annual average peak sunshine in the winter than average peak sunshine hours = 6.1 "then. 65 = 7:5:3., then the peak annual sunshine hours design work every day 1 O hours of solar lamps and lanterns 7:5:3 can be made according to the ratio of the maximum of summer work 14 hours, winter most allowed to work six hours (note: does not consider the effect of different season temperature, etc). In view of this, in order to make the battery in winter not a discharge, can adjust load working time is less than or equal to six hours.

(3) the controller design because solar modules of generating capacity with the weather conditions, sunshine time and change, not very stable, so solar photovoltaic power generation system of independent of the storage battery charging and discharging control than the ordinary application of storage battery charging and discharging control more complicated. Controller design is perfect, the whole solar street lamps directly determine whether system running smoothly. The most important is the controller module PWM light controller and the constant flow module. In the past a lot of investment is to solar cells and LED. Few people care about the two parts to that in the present market condition controller mostly not move light, the ability of PWM constant flow module and the most are using imported from abroad chip. In the solar street lamps usually is the lead as the energy stored unit of storage battery, and lead the output voltage of the battery from full to put, the full charge voltage change is close to 20%. So it caused by the LED current changes may more than four times. Obviously this is completely not allowed. So be sure to put the current constant. In addition, through the street lamp in LED to make intelligent controller, LED a electric lamps, time control and temperature control, and may, according to the environment, prevent the street lamp brightness automatic opening and closing day bright lights waste; Can make the street lamp in the wee hours and dawn time road traffic and pedestrians automatically reduces the power supply flow by reducing the electric current to control the intensity of illumination range, which have increased security energy saving effect and extend the service life of lamps and lanterns effect; When work close to its limit LED temperature critical temperature automatically, and reduce the working current protection, both light source is not compromised, and ensure the safety of the road intensity of illumination.

(4) other aspects due to the street lamp cantilever structure, and in the natural environment, the wind shear, high altitude by hanging, the safety of the structure is the first. So, try to simplify structure, design for streamlining, in order to reduce the wind resistance, increase the flow rate of the rain and pay attention to reduce weight, one is to save non-ferrous metal, 2 it is to reduce weight problems brought by the stress of the road lighting, increasing the safety. At present the public know solar cell module, the encapsulation structure: a glass a monomer battery a sun EVA EVA-TPT membrane layer encapsulation, put wires, junction box, edge sealing strip and aluminum frame, this kind of structure in the monomer battery connection is directly connected to the Internet through article. Solar cell module just rose to be converted into the power of solar power generation function, adornment effect is few, and the wind to pay attention to dust and other long term under the condition of outdoor climate effect.

2 last word the lamps of the our country more than half 100 million light, as long as one of the 6 0 million light into solar street lamps, their annual save power more than one of the three gorges hydropower station of generating capacity. If the future of New Year 2 0 million street lamp all change to use solar street lamps, three years down the three gorges hydropower station is a. The energy-saving effect is very considerable, and it did not need to mobilize the whole strength of selectmen to build, and it launched the power of the local governments at all levels and all relevant enterprise strength can be completed

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