Device-to-device(D2D) communications are now considered as an integral part of future 5G networks
which will enable direct communication between user equipment (UE) without unnecessary routing via
the network infrastructure. This architecture will result in higher throughputs than conventional cellular
networks, but with the increased potential for co-channel interference induced by randomly located
cellular and D2D UEs.
This book is an outgrowth of the pioneering development work done by InterDigital Com-
munication Corporation in 3rd Generation TDD WCDMA Technology. Many engineers
and managers were involved in this development, which spanned a wide range of tech-
nology areas, including system architecture, radio interface, radio modem design, radio
resource management and hardware/software implementation. In addition, TDD WCDMA
technology had many direct and indirect contributors across the globe in the context of
the development of the 3GPP TDD WCDMA Standard.
This book is focused on designing and developing Representational State Transfer (REST)
platforms in Rails. REST is the architectural style of the Web, consisting of a set of
constraints that, applied to components, connectors, and data elements, constitute the
wider distributed hypermedia system that we know today: the World Wide Web.
There are a few good reasons why it makes more sense to build platforms instead of just
products or applications. Platforms are like ecosystems interconnecting different
applications, services, users, developers, and partners. Platforms foster innovation through
the inputs of their direct collaborators. By providing application programming interfaces
(APIs) and software development kits (SDKs), platforms are more customer driven.
對某四輪獨立驅動電動汽車輪轂電機進行研究,設計一種永磁無刷直流電機控制器.以STM32F103RBT6芯片為基礎,對電機驅動電路、采樣電路和保護電路分別進行硬件設計與分析;同時,采用模塊化軟件設計方案,對該控制器的軟件系統進行升級.實驗驗證表明:所設計的電機控制器能使電機響應迅速、轉速穩定、無超調,且電動車動力輸出性能良好.A permanent magnet brushless direct current motor controller was designed by studying the hub motor of a four-wheel independent drive electric vehicle.Based on STM32 F103RBT6 chip,the hardware design and analysis of motor drive circuit,sampling circuit and protection circuit were carried out respectively.At the same time,modular software design scheme was adopted to upgrade the software system of the controller.Experimental results show that the designed motor controller can ensure the motor fast response,stable speed,no overshoot,and good power output performances.
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本應用筆記介紹一種采用dsPIC數字信號控制器(Digital Signal Controller,DSC)或PIC24單片機來實現無刷直流(Brushless Direct Current,BLDC)電機無傳感器控制的算法。該算法利用對反電動勢(Back-Electromotive Force,BEMF)進行數字濾波的擇多函數來實現。通過對電機的每一相進行濾波來確定電機驅動電壓換相的時刻。這一控制技術省卻了分立的低通濾波硬件和片外比較器。需指出,這里論述的所有內容及應用軟件,都是假定使用三相電機。該電機控制算法包括四個主要部分:·利用DSC或單片機的模數轉換器(Analog-to-Digital Converter,ADC)來采樣梯形波BEMF信號·PWM導通側ADC采樣,以降低噪聲并解決低電感問題·將梯形波BEMF信號與VBUS/2進行比較,以檢測過零點·用擇多函數濾波器對比較結果信號進行濾波·以三種不同模式對電機驅動電壓進行換相:-傳統開環控制器·傳統閉環控制器比例-積分(Proportional-Integral,Pl)閉環控制器
電力系統是一個大規模、時變的復雜系統,在國民經濟中有非常重要的作用。電力系統數字仿真已成為電力系統研究、規劃、運行、設計等各個方面不可或缺的工具,特別是電力系統新技術的開發研究、新裝置的設計、參數的確定更是需要通過仿真來確認。目前常用的電力系統仿真軟件有:(1)邦納維爾電力局(Bonneville Power Administration,BPA)開發的BPA程序和EMTP(Electromagnetic Transients Program)程序;(2)曼尼托巴高壓直流輸電研究中心(Manitoba HVDC Research Center)開發的PSCAD/EMTDC(Power System Computer Aided Design/Electromagnetic Transients Program including Direct Current)程序;(3)德國西門子公司研制的電力系統仿真軟件NETOMAC(Network Torsion Machine Control);(4)中國電力科學研究院開發的電力系統分析綜合程序PSASP(Power System Analysis Software Package);(5)MathWorks公司開發的科學與工程計算軟件MATLAB(Matrix Laboratory,矩陣實驗室)。