modulated current 中文意思是什麼

modulated current 解釋
已調電流
  • modulated : 改變了的
  • current : adj. 1. 通用的,流行的。2. 現在的,現時的,當時的。3. 流暢的;草寫的。n. 1. 水流;氣流;電流。2. 思潮,潮流;趨勢,傾向。3. 進行,過程。
  1. Current control by a pw modulated switching rectifier instead of a current sensor

    無電流傳感器的電流控制調寬式開關整流器
  2. The corrosion current and impressed against - corrosion current of a ship modulated by shaft ' s rotation will generate an extremely low frequency electric field ( elfe ) which becomes a kind of important characteristic signal in sea water

    摘要艦船的腐蝕和防腐電流經螺旋槳轉動的調制后在海水中會?生極低頻電場,成?一種重要的特徵信號源。
  3. There are five parts are as follows : in part one, the concept of switching function is introduced first to establish the nonlinear mathematical model of the induction motor variable frequency speed adjustment system which is fed by a sine pulse width modulated ( spwm ) inverter and takes the effect of the main magnetic circuit saturation into consideration, then the low frequency oscillation of the system is simulated according to the model. next, from the view point of energy conversion of the inverter - induction system, a criterion for the low frequency oscillation is proposed to determine whether the system is in low frequency oscillation which is judged by whether the interval of the negative current component of the inverter input current is more than 1 / fc ( fc is the carrier wave frequency of the inverter ) or not

    首先引入開關函數概念,建立了正弦脈寬調制( spwm )逆變器供電異步電動機,考慮主磁路飽和時的變頻調速系統整體數學模型,模擬系統的低頻振蕩;其次從逆變器-異步電動機系統能量轉換角度出發,提出通過檢測逆變器輸入電流中負電流的間隔時間是否大於1 / f _ c ( f _ c為逆變器載波頻率)來判定系統是否出現低頻振蕩;最後的實驗結果驗證了系統低頻振蕩建模和判據的實用性和正確性。
  4. The main limitation of a intensity - modulated - continuous - wave laser rangefinder is the leakage distortion created by the high frequency current source which modulates the laser diode

    在調強連續波激光測距系統中,調制激光器的高頻電流源產生的泄漏干擾是影響測距精度的主要因素。
  5. ( 6 ) new type water gauge and infrared modulated propeller type micro current meter are developed, and collective acquisition of distributed velocities is realized

    ( 6 )研製出aw遠傳振動針式水位儀,新型紅外調制流速傳感器等新儀器、新設備,實現了分散式流速的集中採集。
  6. The techniques with two different methods are classified as : the mode of pulse width modulated, and the difference of control signal. the advantages and disadvantages of each method is analyzed and compared, and where each method is more adapted to is pointed out. a type of switching power supply management ic based on current mode control method is designed which is a pwm boost converter

    本文全面分析、描述了dc - dc開關電源變換器的控制方法,並依據脈寬調制的方法何採用控制信號的選取對控制方法進行了分類,詳細闡述了各種控制方法的基本原理,分析比較了他們各自的優缺點,指出了每種控制方法所使用的場合。
  7. At last, an experiential power supply was made, and a series of experiments is done. a lot of high - frequency pulse current was superposed on dcen current, modulated the welding current waveform we required and optimized the energy distribution, which satisfied the basic requirement of cathode cleaning

    最後製作了一臺實驗電源,並進行了一系列的電弧實驗,通過在變極性電源電流dcen基礎上疊加一系列脈沖電流,調制出所需電流波形,實現輸出能量的最優分配,在滿足陰極清理的前提下,最大限度地提高焊接效率。
  8. Laser diode is the most important laser in practice, it can be modulated by the current directly

    摘要半導體激光器是實用中最重要的一類激光器,它具有可直接調制的特點。
  9. The inverted pwm changing electric current the technique is applied in the prototype model. the prototype model was tested and operated on spot, power factor could reach beyond 0. 95, the effect of following modulating voltage was better, the curve of factor of modulated voltage of exchanging systems changed following load rate was linear, the output of wave form was a flat and steady sinusoidal wave

    樣機採用了逆變式pwm變流技術,對其進行了現場測試與試運行,測試結果是電網側的功率因數可達0 . 95以上,跟蹤調壓效果良好,變流系統輸出調壓系數( k )隨負載率( p )的變化曲線基本滿足直線關系,輸出波形呈平滑穩定的正弦波。
  10. Current sources of 20a / 25v and 50a / 25v are designed using the parallel two - transistor forward dc / dc converter. the output current can be modulated to a certain extent

    採用雙管正激交錯並聯結構,設計了20a 25v 、 50a 25v輸出電流連續地可調的恆流源。
  11. Among them, phase shifted ( ps ) full bridge ( fb ) zero - voltage - switched ( zvs ) pulse - width - modulated ( pwm ) dc / dc converter has strong competitive power in big power capacity fields. but it has some limitations such as smaller load range with zvs and larger circulation energy. the ps - fb - zvs - pwm dc / dc converter with a saturable inductor utilizes saturable inductor s critical saturable current characteristic and storage energy, to enlarge load range with zvs and improve output efficiency under light load

    其中,移相控制零電壓開關脈寬調制dc / dc全橋變換器在大容量領域很有競爭力,但它具有實現零電壓開關負載范圍小,循環能量大等限制,帶飽和電感的移相控制零電壓開關全橋變換器利用飽和電感的臨界飽和電流特性及儲能,來擴大零電壓開關( zvs )的負載范圍,提高輕載時的輸出效率,具有非常重要的研究價值。
  12. In the second one, the input current displacement angle is dynamically modulated as a function of positive and negative sequence components of the input voltages. in both cases, the harmonic content has been evaluated analytically

    第二種方法中,輸入電流矢量根據輸入電壓正、負序成分進行動態調制,並對兩種情況下的輸入電流的諧波成分都進行了分析。
  13. According to the following design theory : the dsp calculates in real time and produces three phases spwm waves to control the on or off of the 6 igbts in ipm respectively. ipm then inverts the commutated single phase direct current ( insulated gate bipolar transistor ) into three phases alternating current. when modulated signals of spwm are changed, the on - off time of switches also changes, so as to the voltage and frequency of output signals

    本文提出了一種基於dsp (數字信號處理器tms320f240 )的通用的三相間接變頻電源系統,利用分段同步調製法和混合查表法,實時計算不同頻率下的采樣周期、電壓幅值、輸出脈寬,產生雙極性spwm波形,經驅動放大後用于ipm ( intelligentpowermodule )中的絕緣柵雙極型晶體管柵級驅動,以控制電源的輸出電壓和頻率,實現變頻電源的智能數字控制。
  14. Improved plasma confinement by modulated toroidal current on ht - 7 superconducting tokamak

    7超導托卡馬克調制電流改善等離子體約束
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