stract With global drivers such as better energy consumption, energy efficiency and reduction of greenhouse gases, CO 2 emission reduction has become key in every layer of the value chain. Power Electronics has definitely a role to play in these thrilling challenges. From converters down to compound semiconductors, innovation is leading to breakthrough technologies. Wide BandGap, Power Module Packaging, growth of Electric Vehicle market will game change the overall power electronic industry and supply chain. In this presentation we will review power electronics trends, from technologies to markets.
標簽: Electronics Materials Power WBG for
上傳時間: 2020-06-07
上傳用戶:shancjb
Forewords to books can play a variety of roles. One is to describe in more general terms what the book is about. That’s not really neces- sary, since Jim Sterne is a master at communicating complex topics in relatively simple terms.
標簽: Intelligence Artificial Marketing for
上傳時間: 2020-06-10
上傳用戶:shancjb
The large-scale deployment of the smart grid (SG) paradigm could play a strategic role in supporting the evolution of conventional electrical grids toward active, flexible and self- healing web energy networks composed of distributed and cooperative energy resources. From a conceptual point of view, the SG is the convergence of information and operational technologies applied to the electric grid, providing sustainable options to customers and improved security. Advances in research on SGs could increase the efficiency of modern electrical power systems by: (i) supporting the massive penetration of small-scale distributed and dispersed generators; (ii) facilitating the integration of pervasive synchronized metering systems; (iii) improving the interaction and cooperation between the network components; and (iv) allowing the wider deployment of self-healing and proactive control/protection paradigms.
標簽: Computational Intelligence
上傳時間: 2020-06-10
上傳用戶:shancjb
Artificial Intelligence (AI) has undoubtedly been one of the most important buz- zwords over the past years. The goal in AI is to design algorithms that transform com- puters into “intelligent” agents. By intelligence here we do not necessarily mean an extraordinary level of smartness shown by superhuman; it rather often involves very basic problems that humans solve very frequently in their day-to-day life. This can be as simple as recognizing faces in an image, driving a car, playing a board game, or reading (and understanding) an article in a newspaper. The intelligent behaviour ex- hibited by humans when “reading” is one of the main goals for a subfield of AI called Natural Language Processing (NLP). Natural language 1 is one of the most complex tools used by humans for a wide range of reasons, for instance to communicate with others, to express thoughts, feelings and ideas, to ask questions, or to give instruc- tions. Therefore, it is crucial for computers to possess the ability to use the same tool in order to effectively interact with humans.
標簽: Embeddings Processing Language Natural in
上傳時間: 2020-06-10
上傳用戶:shancjb
Wherever possible the overall technique used for this series will be "definition by example" withgeneric formulae included for use in other applications. To make stability analysis easy we will usemore than one tool from our toolbox with data sheet information, tricks, rules-of-thumb, SPICESimulation, and real-world testing all accelerating our design of stable operational amplifier (op amp)circuits. These tools are specifically targeted at voltage feedback op amps with unity-gain bandwidths<20 MHz, although many of the techniques are applicable to any voltage feedback op amp. 20 MHz ischosen because as we increase to higher bandwidth circuits there are other major factors in closing theloop: such as parasitic capacitances on PCBs, parasitic inductances in capacitors, parasitic inductancesand capacitances in resistors, etc. Most of the rules-of-thumb and techniques were developed not justfrom theory but from the actual building of real-world circuits with op amps <20 MHz.
標簽: 運算放大器
上傳時間: 2021-11-01
上傳用戶:
在半導體制冷技術的工作性能及其優缺點研究的基礎上,設計了以單片機為核心控制元件,以TEC1-12706為執行元件的半導體制冷溫度控制系統。采用高精度分段式PID控制算法配合PWM輸出控制的方法實現溫度控制;選擇數字傳感器DS18B20為溫度檢測元件,還包含1602液晶顯示模塊、按鍵調整輸入模塊和H橋驅動模塊等。實際測試表明,該系統結構簡單易行,操作方便,工作性能優良,同時針對該系統專門設計的溫控算法,使半導體制冷器能更好地適應不同工況而充分發揮其制冷制熱工作特性。Based on the study of the performance and advantages and disadvantages of thermoelectric cooler(TEC)technology,a thermoelectric cooling temperature control system with single-chip microcomputer as the core control element and TEC1-12706 as the executive element was designed. High precision piecewise PID control algorithm combined with PWM output control method is adopted to realize temperature control. The digital sensor DS18B20 is selected as the temperature detection element. It also includes 1602 LCD module,key adjustment input module and H bridge drive module. The actual test shows that the system has simple structure,convenient operation and excellent performance. Meanwhile,the temperature control algorithm specially designed for the system can make the semiconductor cooler better adapt to different working conditions and give full play to its refrigeration and heating characteristics.
上傳時間: 2022-03-27
上傳用戶:
FPGA那些事兒--Modelsim仿真技巧REV6.0,經典Modelsim學習開發設計經驗書籍-331頁。前言筆者一直以來都在糾結,自己是否要為仿真編輯相關的教程呢?一般而言,Modelsim 等價仿真已經成為大眾的常識,但是學習仿真是否學習Modelsim,筆者則是一直保持保留的態度。筆者認為,仿真是Modelsim,但是Modelsim 不是仿真,嚴格來講Modelsim只是仿真所需的工具而已,又或者說Modelsim 只是學習仿真的一部小插曲而已。除此之外,筆者也認為仿真可以是驗證語言,但是驗證語言卻不是仿真,因為驗證語言只是仿真的一小部分而已,事實上仿真也不一定需要驗證語言。常規告訴筆者,仿真一定要學習Modelsim 還有驗證語言,亦即Modelsim 除了學習操作軟件以外,我們還要熟悉TCL 命令(Tool Command Language)。此外,學習驗證語言除了掌握部分關鍵字以外,還要記憶熟悉大量的系統函數,還有預處理。年輕的筆者,因為年少無知就這樣上當了,最后筆者因為承受不了那巨大的學習負擔,結果自爆了。經過慘痛的經歷以后,筆者重新思考“仿真是什么?”,仿真難道是常規口中說過的東西嗎?還是其它呢?苦思冥想后,筆者終于悟道“仿真既是虛擬建模”這一概念。虛擬建模還有實際建模除了概念(環境)的差別以外,兩者其實是同樣的東西。換句話說,一套用在實際建模的習慣,也能應用在仿真的身上。按照這條線索繼續思考,筆者發現仿真其實是復合體,其中包括建模,時序等各種基礎知識。換言之,仿真不僅需要一定程度的基礎,仿真不能按照常規去理解,不然腦袋會短路。期間,筆者發現愈多細節,那壓抑不了的求知欲也就愈燒愈旺盛,就這樣日夜顛倒研究一段時間以后,筆者終于遇見仿真的關鍵,亦即個體仿真與整體仿真之間的差異。常規的參考書一般都是討論個體仿真而已,然而它們不曾涉及整體仿真。一個過多模塊其中的仿真對象好比一塊大切糕,壓倒性的仿真信息會讓我們喘不過起來,為此筆者開始找尋解決方法。后來筆者又發現到,早期建模會嚴重影響仿真的表現,如果筆者不規則分化整體模塊,仿真很容易會變得一團糟,而且模塊也會失去連接性。筆者愈是深入研究仿真,愈是發現以往不曾遇見的細節問題,然而這些細節問題也未曾出現在任何一本參考書的身上。漸漸地,筆者開始認識,那些所謂的權威還有常規,從根本上只是外表好看的紙老虎而已,細節的涉及程度完全不行。筆者非常后悔,為什么自己會浪費那么多時間在它們的身上。可惡的常規!快把筆者的青春還回來! 所以說,常規什么的最討厭了,最好統統都給我爆炸去吧!嗚咕,過多怨氣實在一言難盡,欲知詳情,讀者自己看書去吧...
上傳時間: 2022-05-02
上傳用戶:
摘要:建立了數字控制DC/DC開關電源閉環系統的s域小信號模型,采用數字重設計法針對給定的系統季數設計了數字補償器。應用SISO Design Tool仿真平臺,在伯德圖分析和根軌連法的基礎上設計了連續城的模擬補償器,并進行了離散化處理。在建立系統s城模型時引入了模數轉換器和數字脈寬調制發生器產生的延遲效應,使補償器的設計考慮了采樣速率對系統的影響,改善了傳統離散設計的誤蓋。基于教字重設計法構建的數字補償器實現了對脈寬調制信號的可編程精確控制,保證了變換器閉環工作良好的動態特性。仿真實驗結果驗證了所設計的數字補償器的性能。關鍵詞:數字控制系統;模數轉換;數字重設計法;數字補償器;數字脈寬調制1引言傳統的開關電源采用模擬控制技術,使用比較器、誤差放大器和模擬電源管理芯片等元器件來調整電源輸出電壓,存在著控制電路復雜、元器件數量多以及控制電路成型后很難修改等缺點,不利于開關電源的集成化和小型化。近年來隨著微電子學的迅速發展,電源的控制也已經由模擬控制、模數混合控制,進入到數字控制階段”,具有可編程性、設計可延續性、元件數量減少、先進的校正能力等優點。以往由于DSP等控制芯片的高成本,數字控制多用于大功率AC/DC變換器、PFC功率因數校正等場合”,而對于DC/DC高頻開關電源只是實現了一些數字化的簡單應用,如采用MCU提供保護、監控和通信功能。隨著數字控制芯片成本的降低,數字控制也逐漸應用于DC/DC直流變換器,直接參與電源的反饋回路控制,實現了信號采樣補償和PWM調節的數字化。數字PID補償器的設計非常關鍵,直接決定了電源的輸出精度、動態響應等指標。近年來對DC/DC開關電源的數字補償器的建模研究已有很多論述],主要基于數字重設計法和直接數字設計法。數字重設計是在傳統模擬電源研究方法的基礎上,首先將數字電源簡化為一個連續的線性系統,忽略了采樣保持器效應后設計模擬補償器,然后采用雙線性近似(Tustin)、匹配零極點(MPZ)等方法對其離散化得到數字補償器。直接數字設計是直接建立零階保持器和被控對象的離散模型,再構建包括離散補償器的反饋系統。數字重設計和直接數字設計法在高采樣速率下設計的數字補償器性能差別不是很大,只是在低采樣速率下直接數字設計更加精確。
上傳時間: 2022-06-18
上傳用戶:zhanglei193
相信大家有移植經驗的都知道,移植確實是一件非常墨跡的事情,怎么說呢,代碼都是別人的,風格也是別人的,文件結構,定義之類都是別人的,看別人的東西是種進步,但是,也是一個痛苦的過程,因為有時候資料確實很少,而且有時候還是E文的,專業名詞一大堆,我們根本沒有辦法想象工作量是多么的巨大.不過事情都是這樣,你不懂他的時候他就像是巨山,但是一旦你理解他的時候,你才會感覺到原來他是那么的簡單(從我的經驗上來看,至少應該是這樣的).好吧,閑話少說,我們就來開始我們的移植之旅把.首先,我們需要準備的東西有uCGUI3.90,這個版本是大家現在用的比較多的,效率也比較高,別人都是這么評論的,至于其他版本的,我沒有接觸很多,所以不能過多評論.UCGUI有三個文件夾,一個是tool,這個文件夾是用來使用一些uCgui的上位機程序,基本都是字體和模板查看之類的,在sample文件夾下面是已經別人都你寫好了很多有用的東西,像跟操作系統有關的GUT×或者一些模板(后面我們會用到的自己定義的Demo),或者是gui配置.后面再 詳細敘說這個文件央的功能.在Start文件夾里面,這是我們最主要的文件夾,里面就包含了uCGUI的源代碼,uCGUI的作者把源代碼放進vc里面進行編譯了(當然,這是用標準C語言寫的程序,所以我們可以放在任何C語言平臺下編譯而不會擔心兼容性問題,這個uCGUI在這方面做的算是完美了),所以,我們可以在vc平臺下寫界面,然后再把代碼拷進我們的下位機編譯器進行編譯,這樣子效率就會非常高了.(像51那時候寫界面就是瘋狂的一次一次的燒,真是糾結.).
上傳時間: 2022-06-19
上傳用戶:
此資源是Ethercat 從站協議生成工具,可方便的生成從站協議代碼,配合LAN9252的相關工具和資料,能方便的地實現Ethercat從機。
標簽: Ethercat
上傳時間: 2022-06-20
上傳用戶: