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ProjExtend
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)
- 2007-04-19 11:31:35下载
- 积分：1
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MonitorCreateProcessEvent
利用WMI监视进程的创建
Private Sub StartMonitorCreateProcessEvent()
Set CreateProcessEvent = New SWbemSink
Set objSWbemServices = GetObject("winmgmts:\.
ootcimv2")
objSWbemServices.ExecNotificationQueryAsync CreateProcessEvent, "SELECT * FROM __InstanceCreationEvent WITHIN 1 WHERE TargetInstance ISA Win32_Process "
End Sub(Use WMI to monitor process creation Private Sub StartMonitorCreateProcessEvent () Set CreateProcessEvent = New SWbemSink Set objSWbemServices = GetObject ( )
- 2007-09-07 09:22:06下载
- 积分：1
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VFP
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.)
- 2013-08-30 16:02:33下载
- 积分：1
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MUSIC
互耦影响存在时修正MUSIC算法的DOA估计(Modified MUSIC algorithm when mutual coupling effects of the presence of DOA estimates)
- 2021-01-04 09:58:56下载
- 积分：1
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06条码
grid++打印条码，特别好用，谁用了就知道了(Grid++ prints barcodes, which are very easy to use. Anyone who uses them knows.)
- 2020-06-22 18:20:02下载
- 积分：1
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5ivb_014029
很好的BMP转JPG，有VB原代码及操作界面(good JPG, VB source code and user interface)
- 2005-03-29 12:10:21下载
- 积分：1
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59564360geocom-ROBOT
说明： 徕卡全站仪开发源码，visual basic语言编制。(Leica total station development source code)
- 2019-12-30 18:56:55下载
- 积分：1
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olmpic_new
用VB+MO做的北京奥运交通查询系统，用esri公司的MO控件作为开发工具，基于VB平台，可以实现数据的管理、浏览以及道路查询(VB MO do Beijing Olympic transport system. esri companies with MO controls as development tools, VB-based platforms, we can achieve data management, View and road inquiries)
- 2020-07-03 20:00:01下载
- 积分：1
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medic
用VB.NET开发的多媒体播放器控件的例子(Development with VB.NET example of multimedia player controls)
- 2010-12-20 11:57:21下载
- 积分：1
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QueryGeo
一个地形查询器吧，可以查询坐标系和一些地理信息(A terrain query browser bar, you can query coordinate system and a number of geographic information)
- 2008-04-22 13:11:22下载
- 积分：1
