torsportation

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：  串口通信，对串口发出的数据进行读取和处理，进行检测(Serial communication, read and process the data sent by the serial port, and detect it.)

说明：  该演示代码示例了使用VB进行比较2个Excel工作表文件是否存在不同，程序先把工作表载入到表格文件，然后输出工作表的差异的详细报告，并以红色提示。 (The code example demonstrates the use of VB to compare two Excel worksheet file is there are different, the program first loaded to the table worksheet file, and then the output difference between the work table a detailed report, and red tips.)

用vb6.0做的一个小的串口测试程序.可以实现正常通信(Used vb6.0 to do a small test program serial)

支持断点续传带进度条的VB下载控件,有需要的就下载吧。(Support breakpoint continuingly download VB controls, with the progress bar has the need to download it.)

average of numbers that implements with C# in visual basic. i wrote it

Get Disk Free Space for Visual basic.

数据库基本功能都可以实现,删除,添加等等(this program is useful for people who want to develop database)

图片反色VB源代码 ，应用程序编程源码，很好的 参考资料。(The picture color VB source code , application programming source code, a good reference.)

任务概述 1．目标： 建立完善的网络书店电子商务网站,不错的源码(Summary of task 1. The goal: to establish a perfect network bookstore e-commerce sites, good source)