一、显示过宽文档在打开文档时,有时会因文档过宽,屏幕上显示不全,这时可以重新调整行的宽度,使其适合文档窗口的大小。如果使用的是普通视图或大纲视图,可以单击'工具'菜单中的'选项'命令,再单击'视图'选项,...一、显示过宽文档在打开文档时,有时会因文档过宽,屏幕上显示不全,这时可以重新调整行的宽度,使其适合文档窗口的大小。如果使用的是普通视图或大纲视图,可以单击'工具'菜单中的'选项'命令,再单击'视图'选项,然后选中'窗口内自动换行'复选框即可。也可以通过改变显示比例使文字适用于普通视图或页面视图中的文档窗口。这时单击'视图'菜单中的'显示比例'命令,然后选择'页宽'选项即可。还可以切换到 Web 版式视图中,使文字自动换行。二、改变文档的缺省目录所有 Office 文档的缺省目录是 C 盘下的 My Documents展开更多
Thanks to the progress in semiconductor technologies, today microcontrollers offer huge computational power. That allows using advanced control algorithms with a built-in intelligence with a sufficient speed, for many...Thanks to the progress in semiconductor technologies, today microcontrollers offer huge computational power. That allows using advanced control algorithms with a built-in intelligence with a sufficient speed, for many demanding applications. These capabilities make the embedded control ideal for using at complex plants and for obtaining the highest performance in a wide area of operations. However, control performance also strongly depends on the feedback. A short latency and a high precision of embedded analog peripherals allow building fast and accurate control loops. The paper proposes an easy design method of high performance analog to digital converter filtering path, optimized for control applications.展开更多
This paper presents a transition-mode zero-voltage-switching inverter for the cooker magnetron of household microwave ovens. The inverter drives a leakage transformer to generate the required high voltage and stabiliz...This paper presents a transition-mode zero-voltage-switching inverter for the cooker magnetron of household microwave ovens. The inverter drives a leakage transformer to generate the required high voltage and stabilized current. For achieving zero-voltage switching, a transition-mode driver L6561 is utilized to detect the ending of transformer resonance and drive an insulated-gate-bipolar-transistor. As transistor is conducted, rectified direct-current voltage drives the transformer. While transistor is cut off, transformer resonates with a parallel capacitor. Transistor conduction time and magnetron power are controlled with a 16-bit digital signal controller dsPIC30F4011. For widening the working range, transistor conduction time is set to be inversely changed with line-frequency input voltage. To demonstrate the analysis and design of this paper, a 1 kW inverter circuit is built. Experimental results show the feasibility and usefulness of the designed magnetron power supply.展开更多
文摘一、显示过宽文档在打开文档时,有时会因文档过宽,屏幕上显示不全,这时可以重新调整行的宽度,使其适合文档窗口的大小。如果使用的是普通视图或大纲视图,可以单击'工具'菜单中的'选项'命令,再单击'视图'选项,然后选中'窗口内自动换行'复选框即可。也可以通过改变显示比例使文字适用于普通视图或页面视图中的文档窗口。这时单击'视图'菜单中的'显示比例'命令,然后选择'页宽'选项即可。还可以切换到 Web 版式视图中,使文字自动换行。二、改变文档的缺省目录所有 Office 文档的缺省目录是 C 盘下的 My Documents
文摘Thanks to the progress in semiconductor technologies, today microcontrollers offer huge computational power. That allows using advanced control algorithms with a built-in intelligence with a sufficient speed, for many demanding applications. These capabilities make the embedded control ideal for using at complex plants and for obtaining the highest performance in a wide area of operations. However, control performance also strongly depends on the feedback. A short latency and a high precision of embedded analog peripherals allow building fast and accurate control loops. The paper proposes an easy design method of high performance analog to digital converter filtering path, optimized for control applications.
文摘This paper presents a transition-mode zero-voltage-switching inverter for the cooker magnetron of household microwave ovens. The inverter drives a leakage transformer to generate the required high voltage and stabilized current. For achieving zero-voltage switching, a transition-mode driver L6561 is utilized to detect the ending of transformer resonance and drive an insulated-gate-bipolar-transistor. As transistor is conducted, rectified direct-current voltage drives the transformer. While transistor is cut off, transformer resonates with a parallel capacitor. Transistor conduction time and magnetron power are controlled with a 16-bit digital signal controller dsPIC30F4011. For widening the working range, transistor conduction time is set to be inversely changed with line-frequency input voltage. To demonstrate the analysis and design of this paper, a 1 kW inverter circuit is built. Experimental results show the feasibility and usefulness of the designed magnetron power supply.
