direct current circuit 中文意思是什麼
direct current circuit
解釋
直羚路-
Taking the silicon diode as an example, through an analysis of the diode ' s current - voltage characters and the avometer circuit, the writer finds out the reasons for the differences in the amount when measuring the positive direct current equivalent resistance with different ohm grades
摘要以硅二極體為例，從二極體的伏安特性及萬用表內部電路的角度，分析了用指針式萬用表的不同歐姆檔位測量二極體的正向直流等效電阻時，其值緣何不同。 -
Railway fixed equipment. high speed unipolar circuit - breakers for direct current traction systems 750, 1500 and 3000 volts. characteristics and tests
鐵路固定設備.直流電壓為750 1500和3000v的牽引設備的高速單極斷路器.性能和試驗 -
The project of the three - step automatic system monitored direct current panel is put forward after thinking of existent questions in which the direct current panel charged and discharged the accumulator. the circuit design and software flowchart about direct insulation, parameter monitoring system, accumulator monitoring system, main monitoring system, communication etc are presented
結合直流屏系統充放電控制中存在的問題，研究提出三級自動監控直流屏方案，給出了直流絕緣、參數監控、蓄電池監控，主監控、數據通信等電路設計和程序流程圖。 -
During the circuit design, the author analyzed the basic principle of the direct current motor, pwm control, h - bridge power driver, and two control techniques of h - bridge power drive circuit, designed its general structure, so the feasibility of the design is confirmed. then, reference, oscillator, power dmos gate drive circuit ( charge pump, bootstrap ), and dead time generation circuit are designed and analyzed in the sub - circuits. a current - controlled oscillator is presented in this thesis
在電路設計中，作者介紹了直流電機的工作原理和數學模型、脈寬調制（ pwm ）控制原理、 h橋電路基本原理和h橋功率驅動電路的兩種控制模式，設計了驅動電路的總體結構，給出了電路的功能模塊，確定了設計的可行性，然後在子電路模塊中，重點分析設計了基準源電路、振蕩器電路、高端功率管柵驅動電路（電荷泵及自舉電路） 、低端功率管柵驅動電路和死區時間產生電路。 -
Among them insulated the insulation resistance testing instrument to adopt the high direct voltage testing method ; the ac insulate testing instrument adopt to the instrument of ac high voltage, and we also designed the protected circuit with excessive current ; the coil insulate testing instrument is adopt surge voltage impact testing method
其中絕緣電阻測試儀採用了直流高電壓測試法；工頻耐壓測試儀採用高壓工頻測試，並設計了過流保護電路；匝間耐壓測試儀採用浪涌電壓測試法，並設計了多路可控硅控制脈沖輸出電路。 -
Moreover, an improved method is proposed for the phase current reconfiguration on the basis of the direct current circuit
提出了一種改進的基於直流迴路母線電流的相電流、相電壓重構方法。 -
Secondly the detection precision is only related to the synchronization phase but not to the amplitude of the mainline voltage because that it uses the optimized pulses synchronous with the mainline voltage as modulation signals. thirdly it decreases the requirement of the input low pass filter and eliminates the error resulting from the direct component and even harmonics of load current. the most significant merit is that it can eliminate the effect of a few low order odd harmonics and the detecting circuit is easy to be implemented
模擬和實驗結果表明該方法的主要優點有：不需使用乘法器進行信號調制，調制信號採用與電網電壓同步的優化特定脈沖，其檢測精度只與同步相位有關，而與電網電壓幅值無關；降低了對輸入低通濾波器的通頻帶要求，直流和偶次諧波分量對檢測精度沒有影響；突出的優點是可以消除有限個低奇次諧波對檢測結果的影響。 -
These results prove that the charging action of the power supply is right. the simulation method is applied with other power supply system. at the same time, the hardware system of 2qkv - 60kw high - voltage capacitor direct current charging power supply is described in this paper, and discuss why designed a full digital phase - shifting pulse circuit
同時，本文敘述了20kv ? 60kw高壓電容直流充電電源的硬體電路的設計，其中討論了為什麼不採用已有的uc3875 、 uc3879等晶元來產生zvspwmdc dc變換器的移相脈沖，設計了全數字式移相脈沖產生電路。 -
The variable polarity power supply circuit uses two stages full - bridge inverter, the former inverter is regarded as a constant - current source with fast dynamic response, and supplys energy for the second one, and the latter one is to produce variable polarity current excellently, and low - frequency pulse current by variable polarity power supply is used to reduce input energy and control the shape of weld bead while welding. a series of high - frequency pulse current is superposed on direct - current - electrode - negative ( dcen ) current through the high - frequency pulse power supply, which is used to compress the arc and improve process of crystallization
其中變極性電源採用二次全橋逆變結構，一次逆變提供快速的響應速率並給二次逆變提供能量，二次逆變提供良好的變極性性能，使輸出能量最優化，並用其低頻電流特性減小電弧線能量，控制焊縫成形;高頻脈沖電源提供的高頻電流疊加在反極性電流dcen上，利用電流的高頻特性壓縮電弧，改善焊縫金屬結晶過程。 -
The author of the dissertation pay a lot efforts to focus on designing the dual - loop control circuit based on optimized psm, include : 1 ). researched the relationship of input and output voltage and output valtage ripple, when psm operate in continuous current mode and discontinuous current mode respectively. what we have done will direct psm apply to converter
本文在psm調制理論的基礎上，設計基於優化psm調制模式的雙環控制電路，主要包括以下幾個方面內容: 1 ）對psm調制模式分別在連續和斷續工作模式下的輸入輸出電壓關系以及輸出電壓紋波進行研究，以期指導psm調制模式在變換器中的應用。 -
These topologies of inverters are composed of two bi - boost dc / dc converters, they are symmetry. so whole circuit turn into four - quadrant converters, we can control every power mosfet on or off. then we can get sine wave with direct current polarization at the left, at the same we also can get sine wave with direct current polarization phase contrast 180 compared of the left at the right
這類逆變器由左右二個雙向boostdc / dc變換器構成，左右二邊是對稱的，所以整個電路構成了一個四象限變換器，我們可以恰當控制各功率管的開、關，使左邊的兩象限dc / dc變換器輸出一個帶直流偏置的正弦波，使右邊的兩象限dc / dc變換器輸出一個相差180度帶同樣直流偏置的正弦波形，這樣，負載zl上的電壓是左、右兩個dc / dc變換器電壓的差動輸出，正好可以消掉直流偏置，最終在負載r1上得到的就是正弦波。 -
Combined with the problems during the experiment, design a improved testing circuit of direct current attenuation method
結合試驗過程中遇到的問題，給出了改進的直流衰減法測試電路。 -
Referring to a plentiful literature all over the world, it chooses a full - bridge shift phase converter circuit topology with a capacitance can insulate direct current and an saturation inductance in the origin side
在參閱了大量國內外文獻的基礎上，選取了一種原邊加隔直電容和飽和電感器的單相全橋移相軟開關變換器拓撲結構。 -
By using the measure and research of the emulating two - port network parameters of using direct - current analysis and figure value output function of sinusoidal steady state circuit in circuit emulating software pspice8. 0, the measure and research have solved the problem of the measuring purely resistive network of simple and odd one in traditional experimient, and also brought about the analysis of alternating current and direct - current for two - port network of any one complex and measure and research of y 、 n 、 z 、 t 、 h and so on parameters, and this opens up one new path for many traditional experimient of not easy to fulfil and for the complex circuit
摘要利用電路模擬軟體pspice8 . 0中直流分析及正弦穩態電路的數值輸出功能模擬二埠網路參數的測量與研究，解決了傳統實驗中只能測量簡單、單一的純電阻網路問題，實現了對任一復雜二埠網路交、直流的分析及y 、 z 、 t 、 h等參數的測量與研究，為更多的不易完成的傳統實驗以及復雜電路的分析研究開辟了一條新路。 -
Using direct current generator principle, set up electromagnetic limit speed auto - rotate nozzle stable state operate circuit, mechanics, energy equation
應用直流發電機原理，建立電磁限速的自旋轉噴頭穩態運行時的電路、力學、能量方程。 -
According to the space vector modulation method of the equivalent structure of the ac - dc - ac transformation, the transformation relations of the matrix converter are deeply investigated. the ac - ac direct conversion control and the double - space - vector pwm scheme of the matrix converter are deduced, the four - step current commutation strategy of matrix converter is expatiated, the design method of input filter and over voltage protection circuit is analyzed, and the modeling and simulation of a three - phase matrix converter are implemented
從等效交-直-交變換的空間矢量調制方法出發，深入分析了矩陣式變頻器的變換關系，導出了交-交直接變換控制規律和雙空間矢量脈寬調制技術，闡述了矩陣式變頻器的換流控制策略，分析了輸入濾波器和過電壓保護電路的設計方法，實現了矩陣式變頻器的建模和運行分析。 -
The power circuit of the system adopts the voltage frequency conversion structure of ac - dc - ac, and is composed of the commutation circuit, filter circuit and intelligence power module ( pm15rsh120 ). control circuit takes the dsp chip tms320lf2407 as core, including the pwm signal occurrence circuit, detect circuit of stator current and direct current voltage of generatrix, drive circuit of intelligence power module, detect circuit of speed, protect circuit of system etc. all of this builds the full digital vector control system of asynchronous motor
該系統的功率電路採用電壓型的交-直-交變壓變頻結構，由整流電路、濾波電路及智能功率模塊ipm （ pm15rsh120 ）逆變電路構成;控制電路以dsp晶元tms320lf2407為核心，加上pwm信號發生電路、定子電流檢測電路、直流母線電壓檢測電路、智能功率模塊驅動電路、速度檢測電路、系統保護電路等，構成了功能齊全的異步電機全數字化矢量控制系統。 -
The open - looped driving circuit is based on the idealization of the vibration. the square wave voltage and the direct current voltage are combined to drive the gyroscope. influences of square wave voltage are analyzed though simulation. as for the real situation of the vibration, the closed - looped driving circuit is given
開環電路採用方波加直流偏置的等效交流電壓驅動陀螺振動，通過模擬分析了方波驅動形式對陀螺振動的影響；結合開環驅動電路，提出了閉環驅動電路方案。 -
Because the company uses the “ direct money and products exchange ” sale method, which guarantee the company ' s capital return on time and current circuit system and avoid the risk of bad debt and dead debt risks, funon company obtains good financial status and runs well without bad loans and debts
由於實行銷售現款現貨制，有力地保證了資金及時回籠和公司現金流，完全規避了呆帳、壞帳風險，因此財務狀況良好，沒有任何不良債權債務，公司運轉十分正常。 -
As the system is regarded as being excited by a constant direct current at the data acquisition point, no complex ac circuit such as filter is required. it can improved the rate of data acquisition and simplify the circuitry of ert system
由於系統採用了直流脈沖信號作為系統的激勵源，后續的信號處理電路就可以直接獲得測量結果，無需復雜、耗時的濾波電路，這就消除了濾波器這一限制數據採集速度提高的「瓶頸」問題。
分享友人