Solar corridor induction delay lighting design

â–¡ Shao Yunhao content based on the advantages of solar energy and LED on the basis of the original sound and light control lamp to improve the use of solar energy LED lamp corridor induction lamp has a certain practical value.

~), male, Lishui, Jiangsu; teacher of School of Physics and Electrical and Electronic Engineering, Huaiyin Teachers College; Research direction: Mechatronics solar energy as a kind of green renewable energy, with large reserves, economic utilization, clean and environmental protection. LED light emitting diode (LEDightEmmingDi-le) is a semiconductor light-emitting device capable of converting electrical energy into visible light. At present, the luminous efficiency of white LED is higher than that of incandescent lamp, and the solar corridor LED lighting is designed based on the advantages of LED and solar energy. The system has certain practical value.

First, the original sound and light control and other improvements in the sound and light control circuit. Replace the original thyristor with a MOS transistor, and use the delayed open circuit composed of C2 and R5 to trigger the output of the CD4011 to maintain a high level for about 30 seconds. Use this high level to trigger the gate of the MOS transistor to make it sturdy. The source is turned on, thereby causing the LED to illuminate.

Since the voltage variation range of the solar panel output is not constant in 18V, a DC-DC chopper regulator circuit is required to perform constant voltage charging on the battery. Using TI's LM25118 for regulated output voltage is 20V. Voltage regulator circuit 3. Battery charge and discharge protection circuit uses three sets of operational amplifiers of LM324 to form undervoltage protection circuit, overvoltage protection and drive control circuit. Use a voltage divider comparison circuit to detect what state the battery is in.

First, the solar panel normally charges the battery when the voltage across the battery is between 14. and 10.8V.

Second, when the voltage across the battery is greater than 14.4V, the battery is in an overcharged state and the solar panel stops charging the battery.

Third, when the voltage across the battery is less than 10.8V, the battery is in the under-pressure XML data storage mode of the university document management system. â–¡ Pan Wei content The traditional relational data mode seriously affects the query speed and increases the burden of programming. The XML data model greatly reduces the difficulty of data layer to presentation layer development, frees programmers from tedious code work for more efficient logic design, and is a new type of document management system.

-), male, Dongsheng; lecturer at Erdos Vocational College, Inner Mongolia; research direction: software development With the development of social information, the number of electronic documents in colleges and universities is growing rapidly, and the types of documents are increasing. A single text document is displayed as audio, video, image and other multimedia files, so that the traditional document management methods in daily work can no longer meet the business needs. In the past standard relational data mode, the disadvantages of increasing data redundancy and increasing complexity of code are particularly prominent. To this end, using the traditional two-dimensional relational database model combined with the XML data model, it is especially important to study a more reasonable data structure, more efficient application functions, and more feasible technical solutions.

First, the traditional relational data mode and operation (a) the functional structure of the system. The classification of the document and the basic information of the document are stored in a standard relational database system (such as SQLServer). Both are associated by a key field.

(Table 1) Document Classification Table Field Setting ID FLM FL (Table 2) Document Basic Information Table Field Setting ID Filename FL Select Document Name Category Name fmm Table 1INNEROIN Table 2 ON Table 1. Classification Index Number = Table 2. Classification Index Number This In the mode, if the classification of documents is more and more, the level is getting deeper and deeper, the storage capacity of the relational database is rapidly increased, and the data redundancy appears in large numbers, which seriously affects the query speed. At the same time, the tree structure display of the classification interface on the system also becomes very complicated, which needs to be implemented by multi-level loop recursion. This design method reduces the efficiency, robustness and reusability of the program, and seriously increases the program. The burden of writing.

Many of today's development languages ​​support the manipulation of XML files and data. Various operations and applications are defined for the characteristics of XML to make the operation and display of XML data more concise and efficient. In APS.net, not only can XML files be read and written. And for the operation of the nodes in the XML data is also available. At the same time, in order to display XML data quickly and effectively on web pages or applications, the controls such as treeview, inap, and menu are tightly bound together. The programmer simply sets a few parameters, which greatly reduces the data layer to The difficulty of developing the presentation layer frees the programmer from the tedious work of code and makes more efficient logic design.

Third, the combination of the relational data model and the XML data model rationally classifies and decomposes the data, and stores them in data modules of different modes.

(1) The function structure of the document management system under the new mode: 1 Under the detailed design and analysis of the system function and data structure, the data is reasonably classified and decomposed so that all the data stored in the relational database in the past are stored separately. Different modes. The classification setting information of the document is stored in the XML file, and the basic information of the document is stored in the relational database.

Use this voltage to power the acousto-optic light control circuit.

The system is mainly composed of solar panel, 12V lead-acid battery, photoelectric conversion circuit, AT89S51 single-chip control, protection circuit, LED output drive unit and LED energy-saving lighting. At the same time, it has the functions of protecting the battery discharge and discharging process, completing the automatic lighting of the LED street light, and automatically extinguishing.

As the cost of solar cells decreases and the efficiency benefits increase, the LED light efficiency increases. The solar LED lighting industrialization technology will be combined with urban construction, especially in the development of energy and environment, LED lighting and energy-saving technologies, renewable renewable energy utilization and other aspects have been vigorously promoted. It is foreseeable that the solar LED lighting industry will be a promising high-tech industry that will bring about tremendous changes in the social environment and human life.

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