用FPGA生成SPWM波形

本程序是基于labview 8.6的QPSK信号调制与解调仿真，利用labview调制解调模块（MT toolkit），将随机产生的0、1比特流进行QPSK调制，显示调制和上变频后的时域谱和功率谱；在解调处理端进行解调，并显示眼图、星座图和解调码字。PS：本程序乃原创，若想熟悉labview的调制解调模块和信号频谱显示，可以参考参考。

厦门市GIS地图 路网 水系（厦门市.KMZ）

模式识别课程的参考教材，内容清晰，很好的教材

在电力电子装置中的一个重要组成部分,输入连接到控制电路的PWM信号输出端，输出连接到装置各IGBT的门极和发射极，将装置中的控制电路产生的数字PWM信号进行隔离传输和电平转换和功率放大,实现控制电路对IGBT进行开通和关断动作的控制，从而实现装置的功率变换功能。InfineontechnologiesIGBT Gate Drive: Power Suppliesa Gate driving voltage for IGBT+15Vturn-on is normally +15VDriver>□1a Gate driving voltage for IGBTOVturn-off can be oV or negativeWith Single Power Supply5V to-15V)a Negative gate driving voltage+15Vhelps IGBt switch off fasterremain in off state but itDriverneeds dual power suppliesOVWhether to use oV or negativegate driving voltage depends15VWith Dual Power Supplieson the requirement on costZH Liang - Al APperformance05Dec2003agefor internal use onlyInfineon Technologies Asia PacificInfineontechnologiesIGBT Gate Drive: InterfaceOpto-couplers is commonly used as interfacingdevices for applications where both signaltransmission and potential isolation are requiredOpto-couplers offers reliable isolation between IGBT(high-potential)& micro-controller(low-potential)Opto-couplers has long signal delay(us)and isexpensiveIsolation +VDpCCMicroDrivercontrollerZH Liang - Al AP05Dec2003Page 6for internal use onlyInfineon Technologies Asia PacificInfineontechnologiesIGBT Gate Drive: Half-bridge DriveStandard configuration: 2 drivers, 2 power supplies, 2 opto-couplersAdvantages: standard, reliableDisadvantages: using opto-couplers, higher system costIsolation +VDDlCC1DriverCC1MicrocontrollerDD2+VCC2DriverCC2ZH Liang - Al AP05Dec2003Page 7for internal use onlyInfineon Technologies Asia PacificInfineontechnologiesIGBT Gate Drive: Half-bridge DriveIn half-bridge IGBT drive, opto-couplers offer two functions(1)safety isolation &(2) shifting the potential of the gatesignal from uc potential to high-side potentialIf safety isolation between IGBT& micro-controller is notneeded, then"Level Shift" can replace opto-coupling andrealize function(2)OptoHigh-sideHigh-sidecouplerDriverIGBTMicro-Opto-LoW-sideLow-sidecontrollercouplerDriverIGBTZH Liang - Al AP05Dec2003Page 8for internal use onlyInfineon Technologies Asia PacificInfineontechnologiesIGBT Gate Drive Level shiftI FeaturesHVc(600V/1200V)沿PULSERFILTERShort Signal DelayPULSE■Cost- effectiveGEN■ No Safety Isolationevel Shift Half-bridge DriverI BenefitHigh-side““°IGBTO Saving Opto-couplersLevel(lower system costShiftMicro● Wider range ofcontrollerLevelLow-side■■■■■直■口m留■Switching FrequencyShiftIGBT(higher flexibility)ZH Liang - Al AP05Dec2003Page 9for internal use onlyInfineon Technologies Asia PacificInfineontechnologiesIGBT Gate Drive: CLTNEWO CLT-Coreless Transformer (for signal transmissionu Coils(Primary Secondary Side)realized on SiliconO Short Signal Delay (allowing high or low switching frequencyu Lower Cost(compared to 1200V level-shift driver日 Safety IsolationCLT Half-bridge DriverHigh-sideCLT Single DriverIGBTCLTMicro-controllerCLTIGBTMicro-controllerLoW-sideIGBTZH Liang - Al AP05Dec2003agefor internal use onlyInfineon Technologies Asia PacificInfineontechnologiesIGBT Gate Drive: Boot-strapBoot-strap circuit includes only a diode and a capacitora In half-bridge drive, the boot-strap circuit can replace the high-sidepower supply and make single-supply operation possibleWhen the low-side IGBT (or FWD)is on, the diode is forwardbiased and the capacitor is charged by the low-side power supplyvia the low-side IGBT and stores the energyWhen the low-side IGBt(and FWD)is OFF, the diode is reversebiased and blocks the dc-bus voltage to protect the low-sidecircuit. Meanwhile, the capacitor supplies energy to the high-sidedriverThe boot-strap capacitance should be high enough to keep thesupply voltage stable Capacitance needed can be calculatedbased on the working conditions and device parametersZH Liang - Al AP05Dec2003agefor internal use onlyInfineon Technologies Asia PacificInfineontechnologiesIGBT Gate Drive: Boot-strap circuitConventional2心菲*|■3 high-side power supplies■1|oW- side power supplyUsing boot-strap circuit心体心心●3 diodes& capacitorso 1 low-side power supplyFeaturesa Diode: ultra-fast recoverya Capacitor: general-purposed ITAa Dependent on low-side IGBTBenefitsSaving 3 PS(transformer cost)22ZH Liang - Al AP05Dec2003Reducing wiring connectionPage 12for internal use onlyInfineon Technologies Asia Pacific

小程序，应用labview的声音采集功能实现，可直接变声

级别：入门级。在VC++2010用ADO方法在ACCESS2010数据库中增加、删除和修改记录。【要在机器中安装Microsoft.ACE.OLEDB.12.0引擎，网上有下载的】。本实例参照清华大学出版社的《Visual C++范例开发大全》，ISBN: 978-7-302-22624-6，作者: 陈国建. 等编著，版次: 2010年7月第1版。本实例参照如下的章节改编出来的：11.1 数据库操作访问技术实例 402实例253 使用DAO建立Access数据库文件 402实例254 使用ADOX建立Access数据库文件 404实例255 使用ADO添加数据库记录 407实例

为了方便学生对于创业类技术型策划书的参考，word格式，比较实用

凸透镜轴上成像的相差(matlab模拟)使用：在matlab命令行下输入lens_imaging后回车参数：根据提示输入，单位厘米例如：s1(物距)=30 n(折射率)=1.46 r1(左球面半径)=10 r2(右球面半径)=-10 R(透镜半径)=5 m(光线条数)=8

精美情人节礼物/爱情表白小程序（直接解压运行即可，退出按Esc键），电脑上用哟，有文字、背景音乐（可替换）、开满玫瑰花等，按住右上角或左上角区域是可以移动的，可以给TA一个惊喜！还可自行设置屏幕铺满带有相框的照片（即在程序目录中新建名为myPhoto文件夹并放入照片图像文件（格式应为：BMP、JPG、JPEG、PNG、GIF，大小建议为280*226和600*484为最宜）。运行到最后会出现的哟！

C#控件大全 C#属性大全 C#事件大全C#控件及常用设计整1、窗体 12、Label 控件 33、TextBox 控件 44、RichTextBox控件 55、NumericUpDown 控件 76、Button 控件 77、GroupBox 控件 78、RadioButton控件 89、CheckBox 控件 810、ListBox 控件 911、ComboBox 控件 1012、CheckedListBox 控件 1013、PictureBox 控件的使用 1114、Timer 控件 1115、ProgressBar控件和 TrackBar控件 1216