Public telephone operators and new independent wireless operators through- out the world are deploying wireless access in an effort to drastically reduce delivery costs in the most expensive part of the network?the local loop. Available radio technology enables both existing and new entrants to access subscribers in a rapid manner and deliver their basic telephony products and broadband-enhanced services.
標簽： Transmission Handbooks Systems Design
上傳時間： 2020-06-01
上傳用戶：shancjb
Broadband powerline communication systems are continuing to gain significant market adoption worldwide for applications ranging from IPTV delivery to the Smart Grid. The suite of standards developed by the HomePlug Powerline Alliance plays an important role in the widespread deployment of broadband PLC. To date, more than 100 million HomePlug modems are deployed and these numbers continue to rise.
上傳時間： 2020-06-06
上傳用戶：shancjb
This is a practical book, to be sure, but it is also a book about hope and posi- tive change. I am quite sincere. The delivery of electricity is deeply rooted in the principle of universal access; when clean, reliable energy is available it contributes to poverty alleviation, improved social conditions, and enhanced economic development. In the developed world, we know this to be true. The digital fabric of our lives is a testimony to the importance of energy security. Across the globe, we have seen the vital contributions that electrification has brought to the development of economies and an enhanced quality of life. Nonetheless, this supreme engineering achievement has languished, and we are deeply challenged.
標簽： Strategies Analytics Data Big
上傳時間： 2020-06-07
上傳用戶：shancjb
n its Framework and Roadmap for Smart Grid Interoperability Standards, the US National Institute of Standards and Technology declares that a twenty-first-century clean energy economy demands a twenty-first-century electric grid. 1 The start of the twenty-first century marked the acceleration of the Smart Grid evolution. The goals of this evolution are broad, including the promotion of widespread and distributed deployment of renewable energy sources, increased energy efficiency, peak power reduction, automated demand response, improved reliability, lower energy delivery costs, and consumer participation in energy management.
上傳時間： 2020-06-07
上傳用戶：shancjb
Electric distribution networks are critical parts of power delivery systems. In recent years, many new technologies and distributed energy resources have been inte- grated into these networks. To provide electricity at the possible lowest cost and at required quality, long-term planning is essential for these networks. In distribution planning, optimal location and size of necessary upgrades are determined to satisfy the demand and the technical requirements of the loads and to tackle uncertainties associated with load and distributed energy resources.
標簽： Distribution Electric Planning Network
上傳時間： 2020-06-07
上傳用戶：shancjb
IP2716是一款集成USB TYPE-C輸入輸出協議、USB Power delivery（PD3.0）輸入輸出協議、QC3.0/2.0輸出快充協議（兼容DCP識別功能，兼容BC1.2、蘋果和三星手機）等多功能。高集成度與豐富功能，使其在應用時僅需極少的外圍器件。如果原有的普通方案輸出功率和輸出電壓范圍滿足需求，只需額外增加外擴的功率MOS就可以實現在原有方案的基礎上升級為支持TYPE-C、PD3.0、QC3.0/2.0的高級快充方案。適當提升DC-DC或AC-DC元件性能，可以輕松實現最高100W（20V 5A）輸出能力，為移動電源、適配器、車充提供完整的TYPE-C解決方案。
標簽： ip2716
上傳時間： 2022-04-09
上傳用戶：
USB Power delivery 快速充電通信原理本篇文章講的快速充電是指USB 論壇所發布的USB Power delivery 快速充電規范(通過VBUS 直流電平上耦合FSK 信號來請求充電器調整輸出電壓和電流的過程)，不同于本人發布的另一篇文章所講的高通Quick Charger 2.0 規范，因為高通QC2.0是利用D+ 和D- 上的不同的直流電壓來請求充電器動態調整輸出電壓和電流實現快速充電的過程。USB PD 的通信是將協議層的消息調制成24MHZ 的FSK 信號并耦合到VBUS上或者從VBUS 上獲得FSK 信號來實現手機和充電器通信的過程。如圖所示， 在USB PD 通信中， 是將24MHz 的FSK 通過cAC-Coupling 耦合電容耦合到VBUS 上的直流電平上的， 而為了使24MHz 的FSK 不對Power Supply或者USB Host 的VBUS 直流電壓產生影響，在回路中同時添加了zIsolation 電感組成的低通濾波器過濾掉FSK 信號。
標簽： USB-PD協議
上傳時間： 2022-06-21
上傳用戶：
USB-PD快充和Type-C測試方案USB-PD（Power delivery）是基于USB Type-C的供電標準，最大功率可達100W雖然USB-PD快充越來越熱，但行業內并沒有針對快充的測試工具，ZLG致遠電子正式發布USB-PD測試方案，并提供免費上門測試！1、USB Type-C簡介Type-C是USB接口的一種形式，不分正反兩面均可插入，支持USB標準的充電、數據傳輸、視頻傳輸、音頻傳輸、顯示輸出等功能。支持USB-PD后則可實現高達100W的電源供電。本文涉及的USB-PD就是通過Type-C的“配置通道引腳CC'（圖1）進行通訊的。USB-PD物理層使用單線通訊（Type-C配置通道CO，為了增強抗干擾能力并均衡直流分量，發送協議數據時，物理層先使用4b/5b編碼對數據進行轉換，再使用雙相標記編碼（BMO對數據流進行二次轉換，最終將信號輸出到CC線上。接收的過程和發送的過程相反，具體過程如圖2所示。發送者或接收者通常為 USB PD控制器或微處理器。對USB-PD協議進行分析時，只能通過CC線上傳輸的信號，其分析過程其實就類似于接收者的行為。
上傳時間： 2022-06-24
上傳用戶：d1997wayne
USB Power delivery Specitfication ，Vertion:PD3.0，英文原版，2018/06/21最新版本。
上傳時間： 2022-07-22
上傳用戶：
VME has been the de-facto bus standard for Commercial off the Shelf(COTS ) Circuit Card Assemblies since the 1980's. VME boards have proven to be remarkably capable of evolving to support newer technologies with innovations such as VME Subsystem Bus, PCI Mezzanine Cards(PMC's) and VME320.However, advances in technologies, appearing particularly in interconnects, have demonstratedthe need for an advance in system development. This advance needs to accommodate high speed interconnect, particularly serial interconnects, and higher power delivery in concert with better heat removal.
標簽： vpx標準
上傳時間： 2022-07-27
上傳用戶：bluedrops
