update

中频感应加热以其加热效率高、速度快，可控性好及易于实现机械化、自动化等优点，已在熔炼、铸造、弯管、热锻、焊接和表面热处理等行业得到广泛的应用。 本设计根据设计任务进行了方案设计，设计了相应的硬件电路，研制了20KW中频感应加热电源。 本设计中感应加热电源采用IGBT作为开关器件，可工作在10 Hz～10 kHz频段。它由整流器、滤波器、和逆变器组成。整流器采用不可控三相全桥式整流电路。滤波器采用两个电解电容和一个电感组成Ⅱ型滤波器滤波和无源功率因数校正。逆变器主要由PWM控制器SG3525A控制四个IGBT的开通和关断，实现DC-AC的转换。 设计中采用的芯片主要是PWM控制器SG3525A和光耦合驱动电路HCPL-316J。设计过程中程充分利用了SG3525A的控制性能，具有宽的可调工作频率，死区时间可调，具有输入欠电压锁定功能和双路输出电流。由于HCPL-316J具有快的开关速度（500ns），光隔离，故障状态反馈，可配置自动复位、自动关闭等功能，所以选择其作为IGBT的驱动。 对原理样机的调试结果表明，所完成的设计实现了设计任务规定的基本功能。此外，为了满足不同器件对功率需要的要求，设计了功率可调。这部分超出了设计任务书规定的任务。(induction heating with high heating efficiency, speed and good controllability and easy to mechanization. the advantages of automation, in melting, casting, bending, forging, welding and surface heat treatment and other industries have been widely employed. According to the design tasks for the design of the program design, design corresponding to the hardware circuit, Development of 20 KW induction heating power. The design of induction heating power IGBT used as a switching device, which can work in 10 Hz- 10 kHz frequency band. It consists of rectifier, filter, and the inverter components. Controlled Rectifier not use the entire three-phase bridge rectifier circuit. 2 filter used an electrolytic capacitor and inductor components II-type filter and passive PFC. Inverter mainly by the PW)

说明：  vc++开发的屏幕编辑工具，已编译调试通过(vc development of the screen editing tools, compiled through debugging.)

风河 串口驱动程序 usb转串口 得益于网站 服务于网站 望管理员采纳 谢谢(wind river)

这是一个关于数据库的东西.里面有些函数.可以实现对于数据库的操作.很好很好用(This is a database of things. Which some functions can be achieved for database operations. Very, very good with)

用来显示对应数字的条形码。共6种码制，可以选择打印大小，打印位置，也可以打印预览，不过暂时还不具备连接打印机打印功能，这个可以自己添加上去。(Used to display the corresponding bar code numbers. A total of six kinds of system code, you can choose print size and print position, you can print preview, but not yet connected with a printer function, this can add up.)

VFP数据库继承了以往传统数据库的优点，是采用了面向对象的程序设计思想和可视化的编程工具，操作简单、易学，极大的方便了软件的开发。人们在使用它作为开发工具时，可以高效的开发出全新的可视化图形界面应用程序。(VFP database inherits the advantages of traditional databases, is the use of object-oriented program design and visual programming tools, simple operation, easy to learn, which greatly facilitates the software development. People use it as a development tool, you can efficiently develop a new visual GUI applications.)

用户从键盘上输入三角形三条边的边长，计算并输出三角形的面积。(calculate the area of a triangle)

７,４汉明码及未编码和多种译码方法误码率性能的对比(Comparison of BER performance between 7,4 hamming codes and uncoded and multiple Decoding methods)

这份资料让您能够很好的了解DLL动态链接，文档分析的很仔细，希望对大家有所帮助。。。。(This information allows you to very good understanding of DLL Dynamic Link, document analysis very carefully, hoping to help all of you. . . .)

Vc++ 6.0 qrcode二维码代码封装，希望有帮助