frequency converters 中文意思是什麼

frequency converters 解釋
變頻器
  • frequency : n. 1. 屢次，頻仍，頻繁。2. （脈搏等的）次數，出現率；頻度；【物理學】頻率，周率。
  • converters : 直接成條機
  1. Torsional interaction exists between hvdc converters and turbine - generators, and negative electrical damping provided by hvdc may cause subsynchronous oscillation ( sso ) that can lead to turbine - generator shaft failure and electrical instability at oscillation frequencies lower than the fundamental system frequency

    高壓直流輸電（ high - voltage - direct - current - - - - hvdc ）系統與臨近同步發電機組之間存在著扭振相互作用， hvdc的電氣負阻尼作用有可能引起機組在次同步頻率范圍的扭轉振蕩。
  2. The temperature range is - 30 ~ 80. the topology of the step - up dc / dc converters and its basic principle is first analyzed in this thesis. then based on the conventional pfm control scheme, a discrete pulse frequency modulation is presented and the state space average model related to the ccm ( continue current mode ) and dcm is established

    然後在傳統的脈沖頻率調制方式的基礎上，分析了一種離散脈沖頻率調制方式，並建立了這種調制方式下升壓型dc / dc變換器在電流連續（ ccm ）工作模式和電流斷續（ dcm ）工作模式的狀態空間平均模型。
  3. High - frequency link power converters are receiving increasing attention. when the input frequency of ac - ac converter is quite high, such as 20khz or above, in order to make sure the converter switching action is restricted to the zero crossing point of the link voltage, the switching cycle becomes discrete pulse spectrums, however, the conventional pwm converters are ruled out because they would fail either to the efficiency or the low - distortion criteria

    當交-交變頻器的輸入頻率非常高，通常為20khz時，為了在零電壓條件下實現逆變器開關管的通斷，變換器的開關時刻必須選擇在高頻交流電壓脈沖為零時，這意味著變換器開關時刻在時間軸上成為不連續的點，而常規的硬開關pwm變換器是將開關時刻選擇在任意時刻。
  4. With the development of electronic technology in the field of high - frequency and high - power, power mosfet is gradually enhancing its important status in semiconductor apparatus and is being widely applied in power converters as switch. with the increasing of the operating frequency ( > 200khz ), the energy loss caused by parasitic capacitance will affect the efficiency of power transforming in converters. especially in the applications of high frequency power supply using mosfet as main devices ( the unit of frequency is mhz ), the energy loss caused by the switch process will badly affect its efficiency

    隨著電力電子技術進一步向高頻的大功率用電領域發展，功率mosfet在各種電力半導體器件中的重要地位日益顯著，使用功率mosfet作為開關器件的功率轉換電路也日益增多，但隨著器件開關頻率的提高（大於200khz ） ，由器件極間電容引起的能量損耗將會影響到功率轉換電路的能量傳輸效率，特別是在以mosfet作為開關器件的高頻感應加熱電源中（工作頻率可達兆赫） ， mosfet在開關過程中的能量損耗嚴重影響到電源的效率，因此如何減小開關器件的損耗提高高頻功率轉換線路的效率成為電力電子技術領域的重要研究課題之一。
  5. The circuit structure of this kind of converters is constituted of input cycloconverter, high frequency transformer ( high frequency storage transformer ), output cycloconverter, input and output filter

    這類變換器由輸入周波變換器、高頻變壓器（或高頻儲能式變壓器） 、輸出周波變換器、以及輸入、輸出濾波器構成。
  6. In the radiation aspect, the features o radiation sources in power converters are discussed. the radiation models of dm current and cm current in cables and radiative characteristics of cables and high frequency current loops in the converter are also discussed

    在功率變換器輻射emi方面，系統地討論了功率變換器各輻射源的特點，重點分析了共模電流和差模電流在電纜中的輻射模型，功率變換器中電纜與高頻電流迴路的輻射性能。
  7. The characteristics of three - level ( tl ) converter and its effect to the zero - crossing distortion are analyzed, and extended it to ml converters, which are suitable for the high input frequency pfc application

    文章詳細分析了三電平（ three - level ， tl ）變換器的特點和對輸入電流過零畸變的改善作用，並推廣至多電平變換器。
  8. The goal of this paper is, by serial / parallel combination technique of two - transistos forward converters ( ttfcs ), to keep the merits of the ttfc, and to overcome the shortages of it. the interleaving technique is adopted, while in combining ttfcs. the interleaving technique lowers the net ripple amplitude and raises the effective ripple frequency of the overall converter without increasing switching losses or device stresses

    組合式雙管正激變換器由雙管正激變換器串並聯構成，應用交錯控制策略，在保留雙管正激變換器功率開關管電壓應力低和可靠性高的優點同時，克服了等效占空比小、副邊二極體電壓應力高、輸出電流脈動大等缺點。
  9. The maximum conversion rate of most dual - slope a / d converters is limited by the frequency response of the comparator

    雙積分a / d轉換器最大的轉變率，限制于其比較器的頻率響應。
  10. Moreover, sampling at high frequency eliminates the need for abrupt cutoffs in the analog anti - aliasing filters. a technique of noise shaping is used in - converters in addition to oversampling to achieve a high - resolution

    由於在- a d轉換器中使用噪聲整形技術和過采樣技術，可以用一個簡單的模擬電路加上復雜的數字電路使整個a d達到一個很高的轉換精度。
  11. Semiconductor devices - part 16 - 3 : microwave integrated circuits ; frequency converters iec 60747 - 16 - 3 : 2002 ; german version en 60747 - 16 - 3 : 2002

    半導體器件.第16 - 3部分:微波集成電路.頻率轉換器
  12. Buck zvs - mr - tl converter is taken as the examples to illustrate the operation of the zvs - mr - tl converters. the operation of buck zvs - mr - tl converter is analyzed as well as parameter design, realization of pulse - frequency - modulation ( pfm ) interleaved control and comparison between zvs - mr converters and zvs - mr - tl converters. a 1000w prototype converter is built in the lab to verify the effectiveness of the proposed converter

    本文以buck零電壓開關多諧振三電平變換器為例，詳細分析了它的工作原理、參數設計、脈頻調制交錯控制的實現、與常規的多諧振變換器的對比，並以一個1000w的原理樣機對該變換器進行實驗驗證。
  13. So it is an important research in the field of the electronic technology to reduce the loss caused by the switching device and to improve the efficiency of high frequency power converters. this paper primarily focuses on the optimization of the mosfet parasitic capacitance so as to reduce the switching loss and improve the efficiency of power transforming in converters using mosfet as switch

    通過分析mosfet器件的開關特性，根據輸出電容c _ （ oss ）給器件引進的動態損耗來確定優化器件輸出電容西安理工大學碩士學位論文l變化曲線的目標函數，運用可行方向法求解帶約束條件的最優值，確定出優化的輸出電容人變化曲線。
  14. Then novel circuit structure and circuit topologies family of voltage mode ( based on forward converter ) and current mode ( based on flyback converter ) ac - ac mode ac / ac converters with high frequency link, are proposed

    本文提出了基於正激forward變換器的電壓源型和基於反激flyback變換器的電流源型交?交型高頻環節ac ac變換器電路結構與拓撲族。
  15. By new the vector - mixer calibration technique has bees teed in our project, the test results show that vector - mixer slaved measuring absolute group delay of frequency converters successfully

    矢量混頻器技術已在工程中應用，測試結果表明，矢量混頻器技術較好地解決了變換鏈路絕對群時延的測量。
  16. The definition and measurement techniques for group delay has been described and analysed in this paper, the new techniques, being called dine - mixer technique and vector - mixer calibration for measuring the absolute group delay of the frequency converters has been researched and analysed in detail also in this paper

    摘要描述和分析群時延的含義和測量方法，著重研究了變頻鏈路絕對群時延的測量方法，對三混頻器和矢量混頻器技術進行了詳細分析和論述。
  17. Harmonics inhibition methods and measurement for frequency converters

    變頻器諧波抑制方法及測量
  18. In recent years, current rectifiers, frequency converters, arc furnaces and other power electronic devices etc have been increasingly used in power network. with nonlinear, impactive, unbalanced characteristics, they generate lots of harmonics and cause distortion in power network current or voltage

    近年來，配電網中整流器、變頻裝置、電弧爐以及其它電力電子設備等的應用不斷增加，由於這些負荷具有非線性、沖擊性和不平衡的用電特性，引起供電網中的電流（電壓）畸變，產生大量諧波。
  19. As technique of power electronics develops, the load with nonlinear, impactive, unbalanced characteristics such as current rectifiers, frequency converters, arc furnaces have been increasingly used in power network in recent years. they generate lots of harmonics and cause distortion in power electrical network current ( voltage )

    隨著電力電子技術的發展，近年來電網中象整流器、變頻器、電弧爐這樣具有非線性、沖擊性和不平衡用電特性的負荷不斷增加，引起供電網中的電流（電壓）畸變，產生大量諧波。
  20. Two abb frequency converters and a siemens programmable logic controller ( plc ) are with the lower - level computer and industry computer are with the host computer. the communication between with the host computer and low - level computer not only translate the system condition, but also send the control instruction. the system condition is shown with chinese window in the host computer, and the constant stress function is realized through the frequency converter part

    2臺變頻器和plc作為下位機設備，工控機作為上位機集中控制，上下位機之間通過通訊，把系統當前狀態、當前給定通過上位機來綜合判斷，並通過上位機以漢化界面形式予以顯示，而下位機的變頻部分則實現管網的恆壓功能， plc實現4臺水泵機組邏輯控制和定期巡檢，及部分故障綜合報告。
分享友人
分享到 Line

分享到臉書