恒定电流

恒定电流源可以避免因输入电压的波动使LED的驱动电流波动并维持LED的亮度不变。

Constant current source can avoid the fluctuations of output current due to the fluctuations of input voltage , and maintain the brightness of LED .

完成芯片的设计后，对芯片进行了整体仿真，仿真结果表明芯片可以在PWM灰度控制下输出恒定电流，整体性能达到了设计指标。

The results of simulation indicated that the chip can supply constant current by PWM controlling , and the performances are appropriate .

通过数字模拟，对实际应用中两端恒流器件的rf调制进行了较详细的分析，并可使恒定电流上rf调制小于1%。

RF modulation on the constant current of the device has been simulated and can be reduced less than 1 % compare to the constant current .

器件的动态阻抗大，电流温度系数αH≤10~（-4）/℃，恒定电流IH在5&500mA范围内具有连续可调等优点。

The device not only has large dynamic impedance , current temperature coefficient less than or equal to 10-4 / ℃ . but also has the advantage of continuous adjustability of output current from 1 mA to 500 mA .

为此给出了恒定电流场中的Maxwell方程，对电位边值问题唯一性定理的三类边界条件做出了详尽的证明。

The Maxwell functions of steady current field are presented . And we give detailed proof to the potential boundary value problems of uniqueness theorem under the three types of boundary conditions .

着重讨论了多重式结构的电流型脉冲变流器，它将能从电网获得cos≈1的准正弦波电流，其输出是可调的恒定电流。

The paper mainly discusses current source pulse converter with multiple connection which receives quasi-sine wave current with cos φ≈ from the AC line and sends out a controlled direct current .

采用恒定电流应力对薄栅氧化层MOS电容进行了TDDB评价实验，提出了精确测量和表征陷阱密度及累积失效率的方法。

TDDB evaluation experiments are implemented on the thin gate oxides MOS capacitor , and a method of precise measurement and characterization the trap density and accumulative failure are presented .

采用恒定电流应力对超薄栅氧化层MOS电容进行了TDDB评价实验，提出了精确测量和表征陷阱密度超薄栅氧化层经时击穿效应与可靠性仿真技术研究和累积失效率的方法。

TDDB evaluation experiments are carried out with constant current stress on MOS capacitors with ultra-thin gate oxides , and a method of precise measurement and characterization of the trap density and accumulative failure is presented .

电流环软启动通过输出电流指令递增实现，电压环软启动则比较了直流侧电压指令逐步升高法、恒定电流充电法、变PI参数调节法三种策略。

Soft start-up of current loop is realized by increasing output current reference step by step . Three soft start-up technique for voltage loop are compared with each other , which are the reference of DC bus voltage gradually increasing , constant charging current and different PI modulation .

该bqTINY-II的收费分三个阶段进行电池：空调，恒定电流和恒定电压。

The bqTINY-II charges the battery in three phases : conditioning , constant current , and constant voltage .

恒定电流为0.3A，考察了煤浆浓度对电化学氧化性质及阳极氧化产品产率的影响，结果表明煤浆浓度越大，电化学氧化反应时间越少，电极寿命越短。

Effect of coal slurries concentration was inspected on characteristics of electrochemical oxidation of coal slurries and yield of anodic oxidation products . Results showed that the coal slurries concentration was higher , the electrochemical oxidation reaction time and the electrode life were shorter .

恒定电流密度下铝合金的硬质阳极氧化

Hard anodic oxidation of aluminum alloys at steady high current density

高温恒定电流电迁移可靠性试验及结果分析

An investigation of high temperature and constant current electromigration reliability assessment technique

恒定电流密度下钛微弧氧化膜的特性研究

Study on the property of titania film under the constant current density by MAO

测量采用吉士利公司的236源测量设备提供恒定电流和高输入阻抗的电压测量。

The 236 source-measure unit of KEITHLEY company was used which can supply the constant current and the high input resistance .

本文首先讨论了位于分层导电媒质中的点电流源所产生的恒定电流场的计算方法。

First of all , the method for calculating stationary current field produced by a point current source in multiplayer media is , discussed .

除常用的过温保护和恒定电流限制保护电路以外，还特别增加了折返式短路保护功能，确保了系统的可靠性。

Besides usual protect circuits such as over-temperature and constant current limit circuits , foldback short protect is designed to ensure the reliability of the chip .

对于通以恒定电流的有限长厚壁螺线管，用柱函数展开法推导出矢势的表达式，再根据磁感应强度与矢势的关系式得出磁场的积分形式表达式。

For a steady current-carrying tightly wound thick-wall solenoid with a finite length , the expression of vector potential is derived by using the method of cylindrical function expansion .

非线性负荷节点的化简采用的是电流穴简化法，该法是把高斯消元法推广到处理非线性负荷，用恒定电流沟近似表达负荷。

Nonlinear loads are reduced by current sink reduction ( CSR ) method , which means nonlinear loads are expressed by current sinks and reduced by Gauss reduction method .

伏安法电子舌是在外加恒定电流的情况下，通过测定电压的变化来反映被测对象信息的一种有效而常用的分析方法。

The voltammetric electronic tongue is an effective and frequently-used analytical method , which mensurate the change of voltage , under the additional current environment , to reflect the information of the detected object .

在机体躯干两侧导入高频微弱恒定电流时，由胃投影部位皮肤电极可测得与胃运动相关的阻抗和导纳变化。

When high frequency feeble constant current is imported to body trunk from sides , the change of impedance and admittance correlative with stomach 's motility can be measured through the electrodes put on the corresponding skin area of stomach 's projection part .

为此，建立了恒定电流密度电镀的数学模型，推导出异型阳极形状的计算公式，为金属带材连续高速电镀的电流密度控制提供了理论依据。

Therefor , a mathematical model of constant current density plating was established , as well as a formula for calculating the geometric of the profiled anode , this work provided a theoretical foundation of density control in metal strip continuous high speed electrodeposition .

应用静电场和恒定电流场的相似性，论述了第1种方法的实现过程，包括积分方程的建立，矩量法离散，奇点的处理，以及离散后的代数方程式等。

The authors also discuss , in the light of the similarity between the electrostatic field and the steady-state current field , the realization of the first approach including the integral equation , division of moment method , singularity treatment and establishment of algebraic equations after division .

方法：恒定电流每日一次刺激大鼠右侧杏仁核，观察尼卡地平对杏仁核点燃发展和发作的影响，测定点燃大鼠脑内各种氨基酸神经递质的含量。

METHODS : Constant current stimulations were delivered to the right amygdala of the rats once a day . The effects of nicardipine on the development and seizure of amygdala kindling were observed and the content of amino acid neurotransmitters in the brain of kindled rats was determined .

设计了一种新型浮压恒流集成二极管，能够同时为几百个LED提供标准恒定工作电流。

A kind of new type float voltage and constant current diode IC is designed , which provide constant current for several 100 LEDs in the same time .

通过采用恒定工作电流和限制电路的输出逻辑摆幅，电流控制逻辑能避免静态CMOS电路工作时引入的瞬态开关噪声电流。

Using a constant biasing current and a reduced output logic swing , current-steering logic avoids the large digital switching noise of conventional static CMOS logic .

整个电路以恒定的电流输出，输出电流达到了350mA，可以驱动1W的大功率白光LED。

The output of the driving current reach up to 350 mA , which can drive the LED with power of 1 watt .

由于白光LED灯正常工作时需要恒定的电流，而基于恒压式的电源不能提供稳定的工作电流，所以灯光闪烁，不能正常工作。

As the white LED lights required constant current , while the switching power supply which is based on constant voltage can not provide a stable operating current , so it lights flashing and can not work properly .

本文详细分析了Quasi-Z源逆变器的工作原理，给出了Quasi-Z源逆变器Z网络的参数设计方法，并针对Quasi-Z源逆变器提出了一种新的PWM调制策略&恒定直通电流追踪型PWM控制。

And its Z-network parameter design is analyzed in detail . A new PWM control strategy & constant shoot-through vector current trail control is modified for Quasi-Z-source is presented in this thesis .

采用恒定小电流密度工艺于硅酸盐体系中在AZ91D镁合金表面制备微弧氧化膜。

Micro-arc oxidation ( MAO ) coatings were formed on AZ91D alloy surface by invariable small current density process in silicate electrolyte .