"We use the power, but God gave it! Thank the party and the government to install solar street lights, environmentally friendly and energy saving, and now we no longer have the dark night walk." October 17, shanting West Village town Wenqi Wen set to go West just install solar lights in the village trail pleased the author said.
To enhance the overall image of the town, the rational use of new energy sources, promote energy conservation, reflecting the "low-carbon life" philosophy, Western town to raise capital 1.4 million yuan to actively implement the solar street lighting project, lighting effects and lighting to meet the lighting needs. This solar security lights with energy saving, environmental protection, easy installation, automatic control of maintenance-free, long life, energy storage during the day and at night shine, the sun bright light a day to four to five consecutive nights, not only enhance the town The lighting effects, but also a great convenience for local people to travel at night, to bring the convenience of people's life, but also to meet the current energy saving, low-carbon life philosophy; lighting lamps for general lighting equal to 3-4 times that is a power of 80 watts of solar power street light equivalent to a 250-watt lamps for general lighting. 200 solar street lights to energy saving 40-degree day expected, the annual saving would be 146,000 degrees, saving electricity about 10.9 million.
Currently, resident in the town leading to Shandong trillion solar energy photovoltaic Limited dates Teng Road and Road (West set above) installed along both sides of the 200 sets of LED solar lights have been put into use, directly benefit 6,000 people. At this point, the West became the Shanting first town to promote the use of solar lights of the township. Now, in the bright solar lights, the town every night to walk on the activities of many people, the town's livelihood initiative that has been widely recognized by the masses and blown away.
Tuesday, October 18, 2011
Sunday, October 9, 2011
An Solar LED street light system designed to match the method
LED light-emitting solid principle, according to the physics of solid light, LED spectrum is almost entirely concentrated in the visible light spectrum, so the luminous efficiency of more than 90%, therefore, LED light source known as the 21st century, will soon become the incandescent, fluorescent High-intensity discharge lamps, the fourth generation light source, is recognized as one of the current top ten cutting-edge technology, LED light source The new light source will replace the traditional lighting, is driving a new industrial revolution - lighting revolution. For the world financial crisis response, out of 4 trillion Central Development and Reform Commission, together with local financial support is expected to have more than 1 O trillion of capital investment to the national transportation, support businesses, improve the basic construction. National Science and Technology recently launched in the country, "Ten thousand ten cities."LED Street semiconductor lighting application engineering, in this powerful wind, the usual government-backed semiconductor lighting industry, will be a great development opportunity.
1 Introduction
A complete Solar LED Street Lighting SystemInclude: LED light source, controller, batteries, solar modules and light body. During the day,Solar Battery components convert light into electrical energy storage battery through the controller, the night the battery powered light source through the controller to make it into light, lighting the road. Light from the system main body protection and decorative effect during the day to ensure the normal operation of the cycle. One LED light source, controller, battery performance is to determine the key street in the design must be optimized, a reasonable configuration.
1) System matching
Solar street lights manufacturers now tend to do too much pursuit of design, but the most important match of system design ignored, without further consideration, a simple calculation of trouble, leading to a large number of lighting problems; some manufacturers build their products to price advantage at the expense of system stability, these practices are not desirable.
Matching design is related to system reliability and stability of the important factors to pay attention, we should primarily consider the following aspects:
(1) solar power generation and load power consumption ratio is reasonable.
(2) the ratio of power consumption and battery capacity should meet the requirements of continuous rainy days and a reasonable depth of discharge.
(3) solar charge current and battery capacity ratio is reasonable.
(4) the load discharge current and battery capacity ratio is reasonable.
2) LED lamp technology features
The purpose of road lighting for night driving vision to provide a safe and reliable conditions, high-brightness LED lights, its light must meet the existing road conditions, traffic safety must meet the brightness requirements. The luminous efficiency and luminous intensity of existing roads to achieve the required brightness of the lighting requirements. Road lighting since July 1, 2007 from the Ministry of Construction to implement the industry standard CJJ45-2006 "city road lighting design standards", for road lighting illumination requirements in Table 1. To make the design tends to be more perfect, mainly the following points should be carefully considered:
(1) the choice of light source
Compared with conventional lighting, LED obvious advantages. LED is low voltage power supply, insulation do not ask, do not need transformers, ballast, starter and other accessories, significant savings in investment; simple structure, light is solid, no inflation, no glass case, there was no gas seal other issues, and impact resistance, shock-resistant, not broken; LED cold light source, good controll ability, faster response time can be repeated frequently light off, not tired; ultra-low power, long life and so on.
LED lights of the intelligent core of the switching power supply design. Wider current switching power supply LED lights generally have rectifier filter circuit, adjust the circuit, sampling circuit, over current protection circuit and DC current output circuit.
In the high-power LED applications, heat is another major consideration, the current LED power consumption, about 80% converted to heat, but not high-temperature semiconductor devices, heat to do well, will cause a very serious light decline, some serious six months may be reduced to half of the original, high-power LED on the street is more stars than series-parallel applications, the necessary multi-finned aluminum air) to make the radiator.
(2) the choice of battery
VRLA batteries in China to promote the application of more than ten years, owing to its small size, light weight, self-discharge, long life, saving investment, easy installation, safe, reliable, easy to use, less maintenance is not in excess acid fog, no corrosion on the environment, pollution and other excellent features, and enables monitoring of the computer unattended and modern management methods; thus the photoelectric street, has been widely used in photovoltaic engineering. But to properly understand the "free" means, to ensure the system safe and reliable.
In the course of maintenance of valve-regulated lead-acid batteries need to establish an accurate charge and discharge system and implemented in order to make the optimal battery performance and longest life. The results show that a large number of studies abroad, determine the battery charge and discharge the use of life, some use the battery so much bad as it is charging improper damaged.
Solar lights from the economy and reliability point of view considered, generally the average annual hours of sunshine lighting configuration design calculations, but the actual work, often controlled by the controller function to set a number of working hours, such as six hours, 8 hours, 1O hours, etc., thus resulting in a year, daily working hours are the same, the same power consumption per day, but by the sun, solar lighting is working, but the amount of solar radiation with the different seasons is very different , that each lamp (solar components must) each season, the average daily generation capacity is very different.
Texas year-round average peak sunshine hours of about 4.44 hours, spring: 4.43 hours, summer: 6.1 on 7-inch small, Fall: 4.47 hours, winter: 2.65 inch small day. Because the average daily peak and average power output is proportional to the number of real sunshine, so I can get the spring and autumn the basic power generation and power consumption to achieve a balance, power off the summer; the lack of electricity in winter.
This caused a certain amount of waste the summer, but winter is a serious shortage, it is likely to cause the battery discharge, affect battery life. For self-discharge, the system matches the cost and other factors is not economical and not very practical. So the load time is regarded as a control solution, according to the Texas peak sunshine hours available: Summer average peak sunshine hours than the annual average peak sunshine hours than average winter peak sunshine hours = 6.1 7:4.44: 2.65 = 7:5:3, the peak sunshine hours throughout the year according to the design work 1O hours a day of solar light can be drawn based on the ratio of 7:5:3 this summer to allow work up to 14 hours allowed to work up to 6 winter hours (Note: does not consider the impact of seasonal temperature, etc.). In view of this, in order to discharge the battery over the winter will not, adjust the load of work time is less than or equal to 6 hours.
(3) Controller
As the generating capacity of solar modules with the weather conditions, sunshine time and change, very unstable, so the solar independent power system for the battery charge and discharge control than the normal application of the battery charge and discharge control is more complicated. Controller design is perfect, solar street lighting system directly determines the smooth running.
Controller module is the most important and constant current PWM dimming controller module. The past, many investors are to invest in solar cell and LED. Few people care to two parts, so most do not currently available controllers for PWM dimming capability, and the vast majority of the current constant current modules are based on chips imported from abroad. LED street light is usually used as a lead-acid battery energy storage unit, and lead-acid battery output voltage from full charge to full discharge, the voltage change will be close to 20%. Therefore, the LED current changes it caused more than 4 times more likely. Obviously this is totally not allowed. So must take the current constant.
In addition, through the LED lights in the smart controller, the LED lights with light control, time control and temperature control, you can open and close automatically according to ambient brightness lamp, day light to prevent waste; can make the lights at midnight to the dawn of time to reduce road traffic and pedestrian flows automatically reduce the supply current, the illumination control in the safe range, and thus serve to increase energy efficiency and extended lamp life efficiency; When the LED operating temperature close to its critical temperature limit, automatically reduce the The current work, both to protect the light source is not compromised, but also to ensure the safety of road illumination.
(4) other
As the street is a cantilever structure, in the natural environment by wind shear, high-altitude flying, structural safety is first. So, try to simplify the structure, designed to be streamlined to reduce drag, increase water flow rate, and pay attention to weight, first, to save non-ferrous metals, the second is to reduce the stress caused by weight problems, increase the safety of road lighting. Currently known in the solar components, using the package structure: EVA one glass a single solar cell an EVA-TPT film stacked packages, which are assembled wire, junction boxes, tape and aluminum frame edge, this structure single cell of the connection is directly connected via interconnect. Just played a solar module will convert solar energy into electrical energy generation role, decorative little, but LED street lights manufacturers should pay attention to wind dust and other long-term effects of outdoor climate conditions.
1 Introduction
A complete Solar LED Street Lighting SystemInclude: LED light source, controller, batteries, solar modules and light body. During the day,Solar Battery components convert light into electrical energy storage battery through the controller, the night the battery powered light source through the controller to make it into light, lighting the road. Light from the system main body protection and decorative effect during the day to ensure the normal operation of the cycle. One LED light source, controller, battery performance is to determine the key street in the design must be optimized, a reasonable configuration.
1) System matching
Solar street lights manufacturers now tend to do too much pursuit of design, but the most important match of system design ignored, without further consideration, a simple calculation of trouble, leading to a large number of lighting problems; some manufacturers build their products to price advantage at the expense of system stability, these practices are not desirable.
Matching design is related to system reliability and stability of the important factors to pay attention, we should primarily consider the following aspects:
(1) solar power generation and load power consumption ratio is reasonable.
(2) the ratio of power consumption and battery capacity should meet the requirements of continuous rainy days and a reasonable depth of discharge.
(3) solar charge current and battery capacity ratio is reasonable.
(4) the load discharge current and battery capacity ratio is reasonable.
2) LED lamp technology features
The purpose of road lighting for night driving vision to provide a safe and reliable conditions, high-brightness LED lights, its light must meet the existing road conditions, traffic safety must meet the brightness requirements. The luminous efficiency and luminous intensity of existing roads to achieve the required brightness of the lighting requirements. Road lighting since July 1, 2007 from the Ministry of Construction to implement the industry standard CJJ45-2006 "city road lighting design standards", for road lighting illumination requirements in Table 1. To make the design tends to be more perfect, mainly the following points should be carefully considered:
(1) the choice of light source
Compared with conventional lighting, LED obvious advantages. LED is low voltage power supply, insulation do not ask, do not need transformers, ballast, starter and other accessories, significant savings in investment; simple structure, light is solid, no inflation, no glass case, there was no gas seal other issues, and impact resistance, shock-resistant, not broken; LED cold light source, good controll ability, faster response time can be repeated frequently light off, not tired; ultra-low power, long life and so on.
LED lights of the intelligent core of the switching power supply design. Wider current switching power supply LED lights generally have rectifier filter circuit, adjust the circuit, sampling circuit, over current protection circuit and DC current output circuit.
In the high-power LED applications, heat is another major consideration, the current LED power consumption, about 80% converted to heat, but not high-temperature semiconductor devices, heat to do well, will cause a very serious light decline, some serious six months may be reduced to half of the original, high-power LED on the street is more stars than series-parallel applications, the necessary multi-finned aluminum air) to make the radiator.
(2) the choice of battery
VRLA batteries in China to promote the application of more than ten years, owing to its small size, light weight, self-discharge, long life, saving investment, easy installation, safe, reliable, easy to use, less maintenance is not in excess acid fog, no corrosion on the environment, pollution and other excellent features, and enables monitoring of the computer unattended and modern management methods; thus the photoelectric street, has been widely used in photovoltaic engineering. But to properly understand the "free" means, to ensure the system safe and reliable.
In the course of maintenance of valve-regulated lead-acid batteries need to establish an accurate charge and discharge system and implemented in order to make the optimal battery performance and longest life. The results show that a large number of studies abroad, determine the battery charge and discharge the use of life, some use the battery so much bad as it is charging improper damaged.
Solar lights from the economy and reliability point of view considered, generally the average annual hours of sunshine lighting configuration design calculations, but the actual work, often controlled by the controller function to set a number of working hours, such as six hours, 8 hours, 1O hours, etc., thus resulting in a year, daily working hours are the same, the same power consumption per day, but by the sun, solar lighting is working, but the amount of solar radiation with the different seasons is very different , that each lamp (solar components must) each season, the average daily generation capacity is very different.
Texas year-round average peak sunshine hours of about 4.44 hours, spring: 4.43 hours, summer: 6.1 on 7-inch small, Fall: 4.47 hours, winter: 2.65 inch small day. Because the average daily peak and average power output is proportional to the number of real sunshine, so I can get the spring and autumn the basic power generation and power consumption to achieve a balance, power off the summer; the lack of electricity in winter.
This caused a certain amount of waste the summer, but winter is a serious shortage, it is likely to cause the battery discharge, affect battery life. For self-discharge, the system matches the cost and other factors is not economical and not very practical. So the load time is regarded as a control solution, according to the Texas peak sunshine hours available: Summer average peak sunshine hours than the annual average peak sunshine hours than average winter peak sunshine hours = 6.1 7:4.44: 2.65 = 7:5:3, the peak sunshine hours throughout the year according to the design work 1O hours a day of solar light can be drawn based on the ratio of 7:5:3 this summer to allow work up to 14 hours allowed to work up to 6 winter hours (Note: does not consider the impact of seasonal temperature, etc.). In view of this, in order to discharge the battery over the winter will not, adjust the load of work time is less than or equal to 6 hours.
(3) Controller
As the generating capacity of solar modules with the weather conditions, sunshine time and change, very unstable, so the solar independent power system for the battery charge and discharge control than the normal application of the battery charge and discharge control is more complicated. Controller design is perfect, solar street lighting system directly determines the smooth running.
Controller module is the most important and constant current PWM dimming controller module. The past, many investors are to invest in solar cell and LED. Few people care to two parts, so most do not currently available controllers for PWM dimming capability, and the vast majority of the current constant current modules are based on chips imported from abroad. LED street light is usually used as a lead-acid battery energy storage unit, and lead-acid battery output voltage from full charge to full discharge, the voltage change will be close to 20%. Therefore, the LED current changes it caused more than 4 times more likely. Obviously this is totally not allowed. So must take the current constant.
In addition, through the LED lights in the smart controller, the LED lights with light control, time control and temperature control, you can open and close automatically according to ambient brightness lamp, day light to prevent waste; can make the lights at midnight to the dawn of time to reduce road traffic and pedestrian flows automatically reduce the supply current, the illumination control in the safe range, and thus serve to increase energy efficiency and extended lamp life efficiency; When the LED operating temperature close to its critical temperature limit, automatically reduce the The current work, both to protect the light source is not compromised, but also to ensure the safety of road illumination.
(4) other
As the street is a cantilever structure, in the natural environment by wind shear, high-altitude flying, structural safety is first. So, try to simplify the structure, designed to be streamlined to reduce drag, increase water flow rate, and pay attention to weight, first, to save non-ferrous metals, the second is to reduce the stress caused by weight problems, increase the safety of road lighting. Currently known in the solar components, using the package structure: EVA one glass a single solar cell an EVA-TPT film stacked packages, which are assembled wire, junction boxes, tape and aluminum frame edge, this structure single cell of the connection is directly connected via interconnect. Just played a solar module will convert solar energy into electrical energy generation role, decorative little, but LED street lights manufacturers should pay attention to wind dust and other long-term effects of outdoor climate conditions.
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