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With the power electronics technology, microelectronic technology , intelligent control technology, the rapid development of new devices , advanced control technology and the constant introduction of new technology , welding and control technology has been rapid development, however, the modern industrial production continued Butt machines and welding control technology put forward higher requirements , which makes the welder and its control technology must now prevalent from analog to digital control technology controls the direction of development, so that welding power toward large capacity , lightweight, high- frequency in the direction of development, so that the control of welding technology is more intelligent. Welding power source for the modern field of digital, network development trend , this article is designed based on CAN bus communication technology, digital welding power control system to the CAN bus as a communications bus, and use a high-speed , highly integrated processor TMS320F2812 as data acquisition and processing of the core, through communication with the host computer to complete the digital welding power source monitoring. The system design in general is divided into hardware and software components . Against the needs of the system , the hardware design and implementation of the voltage and current paper collection , CAN bus data transceiver , CAN bus isolation , keyboard and display circuit. In software, monitoring systems in order to achieve friendly and convenient interactive and complete systems for a variety of different types of welding machine control , this system on the host computer using Visual C development of SCADA interface and database systems, and technology to achieve through ADO access to the database , ADO technology in the field of database access is by virtue of its ease of use , speed , memory, and disk less expenditure remains small advantages gradually replace the ODBC and DAO, into the mainstream. In CCS3.1 the environment, using a modular approach , designed to complete each module : Welding type selection module , voltage and current acquisition module, data analysis and comparison module, CAN bus communication module , LCD display module, a keyboard scanning module and other modules design work. Through careful analysis and design of the main program , to achieve a rational management of each task , reaching the system design requirements. Finally, in order to meet the system in a multitasking environment, job requirements , This paper describes the real-time operating system μC / OS-II in the transplant TMS320F2812 .
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