Photovoltaic lighting device using light emitting diode as light source

LEDs have many features and advantages, mainly: low operating voltage (1.5 ~ 3V), low operating current (5 ~ 150mA), low power consumption (the same brightness consumption is only 1 / 4 of the ordinary incandescent lamp 4 LED cross-section A* light exit direction; B reflected back inside the semiconductor surface; 0. Critical angle of internal total reflection 10), fast response, light weight, simple drive, easy to match with integrated circuit, long life (more than 100 times that of incandescent lamps), impact resistance, stable performance, simple production, low cost, no toxic relatives. The main topics that are being researched and solved are: further improving the brightness, efficiency and stability of the light, achieving high-intensity blue light, and making large-area components.

The world's GaP LEDs were made around the 1960s and entered the application market around 1970. It has been widely used in scientific research and production, and the industrial construction has developed rapidly, and the number of market applications has grown rapidly. In China, the first GaAs single crystal was grown by horizontal method in 1962. The first GaAs semiconductor laser was fabricated in 1963. In 1968, the gas phase and liquid phase epitaxy technology of GaAs was successfully studied. Since then, the production of light-emitting diodes and semiconductor lasers has been completed. The technology has developed rapidly in China. At present, it has a considerable industrial production capacity, and it is close to or reaches the advanced foreign technology level in terms of the performance of some varieties.

Electroluminescence sources, especially LED sources, are at the point where experts predict that in the first half of the 21st century, new light sources, represented by light-emitting diodes, will gradually become mainstream products of electric light sources. Just like a transistor instead of a tube, the replacement of traditional incandescent and fluorescent lamps with a new type of semiconductor lamp with a light-emitting diode is also a trend. The US Department of Energy predicts that by 2010, 55% of incandescent and fluorescent lamps in the United States will be replaced by semiconductor lamps, saving about $35 billion a year. Sakamoto proposed that in 2006, semiconductor lamps will be used to replace traditional white light lamps on a large scale. In addition, the European Union and South Korea have also proposed national semiconductor lighting plans. According to estimates, in the United States only seven years later, semiconductor lighting can form an industry of more than 50 billion US dollars. Facing the attractiveness of the huge market power of semiconductor lighting, the three world lighting industry giants such as General Electric, Philips and Osram have already cooperated with semiconductor companies to form a semiconductor lighting company and proposed to make semiconductor lamps by 2010. The luminous efficiency is increased by 8 times and the price is reduced by 100 times. A battle to seize the commanding heights of the emerging industries of semiconductor lighting has started around the world.

Faced with this technological development trend, China's Ministry of Science and Technology has reviewed the situation and timely moved the national semiconductor lighting project, and recently established the National Semiconductor Lighting Engineering Coordination Leading Group. On July 18, 2003, the team leader and Director of the High-tech Development and Industrialization Department of the Ministry of Science and Technology Li Jian told the media: Following the microelectronic revolution triggered by semiconductor technology, a new lighting revolution is now being used. Semiconductor light-emitting diodes as semiconductor lamps for new light sources will gradually replace traditional incandescent and fluorescent lamps.

2 China's light-emitting diode photovoltaic lighting device research and development and application bookmark4 After more than 10 years of efforts, China's light-emitting diodes as a light source of photovoltaic lighting devices, has developed a number of novel, unique, high-performance commercial products, its market application Year by year, the prospects are good. The following is a brief introduction to the development and application of products with good prospects in three markets.

(1) Solar Lawn Light: Shenzhen Weiwei Industrial Co., Ltd. is the earliest enterprise in China to develop solar lawn light with LED as light source and put it into commercial production in large quantities. Its products have excellent performance, unique shape and various specifications. Yellow, white, green and blue light colors. Because the LED is used as the light source, the lamp consumes less power, is small in size, light in weight, long in life, durable and has a small amount of photovoltaic cells. The company's annual output of LED solar lawn lamps, based on photovoltaic cell power, is about 2~3MW, and more than 90% is sold to the United States. The market is stable and popular.

(2) Solar traffic signal light: In recent years, Hangzhou Fuyang Novel Electronics Co., Ltd. has developed and promoted a variety of solar energy traffic meters. 1 Light source power consumption per day and night consumption of electricity and electricity (according to 0.7 yuan / kWh) flash life WkWh daily electricity bill Annual electricity price difference / hLED4.80.1150.0828.801100000 incandescent lamp 100.02.4001.68604.80 signal light, such as LED solar yellow flashing warning light, LED solar traffic traffic light, LED solar vertical signal light, LED solar dynamic pedestrian signal light, LED solar countdown motor vehicle road Signal lights, LED single-arm suspended solar channel management signal lights, LED solar road construction command lights, LED solar energy road signs and LED solar dual-color electronic information boards, etc., have been recognized and praised by the public security and transportation departments, and the market application volume has expanded year by year. And began to enter the international market. The power consumption, electricity cost and flashing life of the urban road traffic lights of the LED light source and the incandescent light source are listed in Table 1. The data in the table can clearly see the advantages of power saving and long life of the LED light source.

(3) Solar lighting project: In recent years, Wuhan Fuxin Lighting System Engineering Co., Ltd. has designed and constructed a number of urban solar lighting projects with LED as the light source and solar cells as the power source. These lighting projects not only beautify the city, but also popularize the knowledge of new light sources and new energy, which has a great impact. Such as: 1 Hanzhan Railway Station station square lawn lighting project: installed 40 dome LED solar lawn lights and 40 oblique top LED solar lawn lights and 2 high pole garden lights, 20 buried floodlights, The annual electricity cost can be saved by about 95% and the total cost is more than 13,000 yuan. 2 Liangjiang Road, Jianghan District, Wuhan City, textile, ferry, food, port and four companies along the Yangtze River 4 residential building lighting project: all use LED lighting to outline the building corridor, and monochrome, multi-color, chasing, flashing, beating, The flicker multi-flow automatic control makes it have a sense of flow and visual effect. The shared LED light source is 1600 盏, the solar cell 300 WP, and the annual energy saving is 95%, accounting for more than 9,500 yuan. 3 The 11th Hospital of Wuhan City, the new building night lighting project: 15 sets of solar floodlights < 5 solar poles, 2 garden lights, 320 LED bulbs, 8 solar lawn lights, 3 AC spotlights, 4 years The electricity cost is only about 4,300 yuan, which can save more than 30,000 yuan in electricity costs per year than the AC program. 4Wuhan City Yanjiang Avenue Liuhe Road □ troops "Little Red House" lighting project: the use of LED wax yellow light bulb 330 盏, 5 每 per meter, constantly chasing light, lighting 6 hours a night. The shared solar cell 50WP is controlled by a solar dual-control system, which can be automatically converted to AC charging by rainy days. It is equipped with a 510A watt-hour meter. In the whole year, only the electricity fee is about 1 yuan, which is 97% more than the electricity consumption by AC, and it is more than 1,400 yuan.

The photovoltaic lighting device with LED as the light source has a wide variety of products, a strange and colorful, wide application, great market potential and good industrialization prospects. We should pay full attention to it, take a variety of measures, actively research and develop, do a good job in product design, modeling design, architectural aesthetic design and application engineering construction, vigorously develop the application market and promote its rapid development.

Lock a stove to seal 4 acres of mountain forest bookmark6 According to Xinhua News Agency (Liu Shuyun Chen Gang) lighting without electricity, cooking without firewood and charcoal. The construction of rural energy based on biogas is changing the old habits of cutting wood and cooking and destroying vegetation in some rural areas of China.

According to the data, a farmer builds an 8 cubic meter biogas tank, which can save more than 2,000 kilograms of firewood per year. It is calculated by growing 500 kilograms of wood per acre of forest land, equivalent to sealing 4 acres of forest.

It is understood that the "Eco-Homes Enrichment Program" organized by the Ministry of Agriculture and aimed at promoting biogas technology has been launched as early as three years ago. So far, the state has invested 400 million yuan to finance the development of biogas digesters. This year, the state has allocated another 1 billion yuan of treasury bonds for this plan.