為深入了解基于UC3854A控制的PFC變換器中的動力學特性,研究系統參數變化對變換器中分岔現象的影響,在建立boost PFC變換器雙閉環數學模型的基礎上,用Matlab軟件對變換器中慢時標分岔及混沌等不穩定現象進行了仿真。在對PFC變換器中慢時標分岔現象仿真的基礎上,分析了系統參數變化對分岔點的影響,并進行了仿真驗證。仿真結果清晰地顯示了輸入整流電壓的幅值變化對系統分岔點的影響。 Abstract: In order to better understand the dynamics characteristic of power factor correction converter based on UC3854A, and make the way that parameters change influences the bifurcation phenomena of the system clearly. The math model of the two closed loop circuits to the boost PFC (Power Factor Correction) converter controller was built. Then, with the help of Matlab, the simulation for nonlinear phenomena such as chaos and slow-scale bifurcation in the PFC converter was made. Finally the factors that have influence to the phenomenon of bifurcation under slow-scale in PFC converter were analyzed. The simulation results clearly show the parameters change influences the bifurcation point of the system.
上傳時間: 2013-10-17
上傳用戶:杜瑩12345
摘要:本文給出了一種基于單片機AT90PWM2B的boost升壓型臨界電流模式有源功率因數校正的實現方法。在70W可調光熒光燈電子鎮流器上的實用結果驗證了該方法的可行性和有效性。該方法可以推廣到電子鎮流器和開關電源等對功率因數要求較高的電力電子產品。關鍵詞:有源功率因數校正;boost升壓;臨界電流模式;AT90PWM2B;PSC
上傳時間: 2013-11-12
上傳用戶:Vici
LPC900 系列芯片在低電壓環境下工作,適合低功耗應用。通過 Sipex 公司的 DC/DC buck 穩壓器,DC/DC boost 穩壓器,LDO 型穩壓器,我們可以輕松實現各種低電壓供給電路,滿足您的各種應用。ZLG 公司為客戶提供全系列微控制器電源電路解決方案。
上傳時間: 2014-12-27
上傳用戶:yunfan1978
Integrated EMI/Thermal Design forSwitching Power SuppliesWei ZhangThesis submitted to the Faculty of theVirginia Polytechnic Institute and State Universityin partial fulfillment of the requirements for the degree of Integrated EMI/Thermal Design forSwitching Power SuppliesWei Zhang(ABSTRACT)This work presents the modeling and analysis of EMI and thermal performancefor switch power supply by using the CAD tools. The methodology and design guidelinesare developed.By using a boost PFC circuit as an example, an equivalent circuit model is builtfor EMI noise prediction and analysis. The parasitic elements of circuit layout andcomponents are extracted analytically or by using CAD tools. Based on the model, circuitlayout and magnetic component design are modified to minimize circuit EMI. EMI filtercan be designed at an early stage without prototype implementation.In the second part, thermal analyses are conducted for the circuit by using thesoftware Flotherm, which includes the mechanism of conduction, convection andradiation. Thermal models are built for the components. Thermal performance of thecircuit and the temperature profile of components are predicted. Improved thermalmanagement and winding arrangement are investigated to reduce temperature.In the third part, several circuit layouts and inductor design examples are checkedfrom both the EMI and thermal point of view. Insightful information is obtained.
上傳時間: 2013-11-16
上傳用戶:萍水相逢
Apriori算法源碼(C++) 看了以前在這里發的apriori源碼,覺得寫得代碼有些繁瑣,現在重寫了一下,主要是把數據操作和界面顯示分離,使用了stl和boost,簡化了字符操作的算法,數據庫用的是mysql的,API是mysql++,在mfc下mysql++無法運行,所以gui框架用的是win32gui-lib(可以到sf.net/project/win32gui下載)。當然你也可以用odbc改寫,或是換用別的數據庫,因為算法邏輯是獨立的,所以應該很容易改寫
上傳時間: 2013-12-28
上傳用戶:cxl274287265
This collection of C++ templates wraps the FORTRAN or C interfaces for LAPACK so that they integrate with the boost uBLAS library. Currently implements Cholesky decomposition, LU decomposition, inversion and determinant for general and positive-definite matrices.
標簽: collection interfaces integrate templates
上傳時間: 2015-08-10
上傳用戶:chfanjiang
Recite(一個輔助英語學習軟件源碼) 該程序的UI部分使用了WTL7.5。WTL7.5可以很容易的在微軟的官方網站找到,安裝也很簡單。 另外使用了boost庫中的部分內容。包括filesystem用于操作文件名和目錄,可以在( http://lunatic.bokee.com/5899788.html )找到更詳細的介紹。serialization用于將對象序列化在磁盤文件中。datetime用于做日期的計算。還用到了string algo做簡單的字符串操作。因此你需要從( http://www.boost.org )下載boost的最新版本1.33.1,并在本地編譯它。 配置文件的讀寫使用了TinyXML,源碼已經包含在源碼包中,無須另外下載。 整個程序的祼奔性相當好,不依賴于其他任何的DLL或COM庫,就一個EXE文件。 我的編程和調試環境為WindowsXP,Visual Studio .net 2003。 該軟件的目的及作用請參見( http://lunatic.bokee.com/6153131.html ) 使用方法( http://lunatic.bokee.com/6153160.html ) 相關的資源( http://lunatic.bokee.com/6153181.html )
上傳時間: 2015-09-19
上傳用戶:fxf126@126.com
在VC 6.0平臺下,讀取G代碼文件,利用boost中Regex正則表達式逐行提取數控G代碼中的數值,分析兩行G代碼之間各軸速度變化。提供保存分析結果功能
標簽: 6.0
上傳時間: 2014-01-23
上傳用戶:hasan2015
C++ class libraries for network-centric, portable applications, integrated perfectly with the C++ Standard Library. Includes network protocols (Sockets, HTTP, FTP, SMTP, POP3, etc.) and an XML parser. Licensed under boost license.
標簽: network-centric applications integrated libraries
上傳時間: 2016-02-05
上傳用戶:chenxichenyue
此書名為超越C++標準程序庫,是的,它講述的正是boost庫(boost庫可是未來c++的標準方向喲,掌握了boost就是掌握了未來的c++)。包含了各個庫的功能的詳細介紹以及列舉的例子??偟陌ㄓ脦臁⑷萜骷皵祿Y構、函數對象及高級編程幾個大的部分,內部又有很多小的部分。
上傳時間: 2016-06-09
上傳用戶:皇族傳媒