脉冲占空比

IC锁相环在脉冲占空比测量中的应用

Application of Integrated Circuit Phase-locked Loop in Measuring Pulse Duty Factor

综合两次MTD结果得到了目标的实际速度，并推导出了脉冲占空比和速度测量误差的关系式。

By synthesizing twice MTD results , actual velocity of the target is gained . Relation between pulse duty ratio and velocity measurement error is deduced .

利用蓄电池的充电电压和充电状态之间的关系，用蓄电池的状态估计法和倒推法，解决了均衡器中开关器件的PWM脉冲占空比的计算问题。

Taking advantage of the relationship between the state of charges and the voltage of batteries , the duty ratio of switching device in the CEC can be calculated by using measured voltage of battery .

在2mm厚的哑铃形A3钢试件上进行对接闭环控制实验，试验结果表明：在散热条件变化的条件下单独调节脉冲占空比可以保证焊缝反面宽度的稳定；闪光对焊封闭环式箍筋应用技术

Closed loop control experiments with butt joint were conducted on 2 mm mild steel dumbbell shaped work piece . Application of Closed Stirrup With Flash butt Welding Method

数字光通信接收机灵敏度计算及信号脉冲占空比的选择

Sensitivity Calculation of Digital Optic Communication Receiver and Duty Circle Determination of Signal Pulse

对于一定的发射功率，脉冲占空比有一个最优值。

In addition , the duty cycle of pulse has an optimum value for a certain launched power .

详细探讨了电解工艺参数（脉冲占空比、频率、平均电流密度以及溶液温度）等对纳米纤维聚苯胺膜合成的影响，获得了制取纳米纤维聚苯胺的最佳工艺条件。

Influences of electrolytic parameters ( the ratio of ton to toff , frequency , mean current density and temperature of electrolyte ) on synthesis of nano-fibrous PANI were studied in detail . The process conditions were optimized .

选择合适的脉冲占空比和负脉冲，可以提高镀锌层的防蚀性能，并可降低镀层的硬度与脆性，是脉冲镀的一个新发现。

Selecting suitable pulse duration ratio and negative pulse can be improved property of the zinc coating corrosion-resisting and also can be reduced hardness and brittleness of the zinc coating . This is a new discovery of pulse plating .

介绍一种采用直接数字化方案的脉宽调制（PWM）电路，它可把微小的电阻或电容信号调制成脉冲的占空比，从而实现A/D转换。

A pulse width modulation ( PWM ) circuit adopting direct digitizing strategy is presented . It modulates little resistance or capacity signal into pulse duration ratio , thus A / D conversion is implemented .

本文提出了一种新的电力电容器调容方法，该方法基于PWM控制原理，用电力电子开关控制两组电容器的投切，通过调节控制脉冲的占空比连续调节电容。

The paper presents an new method of continuously varying capacitance , which is based on the principle of PWM . Two power capacitors are switched under the control of IGBT or Power MOSFET and the capacitance continuously varies when pulse duty cycle is changed .

本方案还实现了图像对比对度调节，液晶前照光调节（调节输出脉冲的占空比），立体图像源自动识别，还有人性化的操作界面（OSD）功能。

This system can also achieve image contrast adjustment , LCD backlight adjustment ( adjustable output pulse duty cycle ), automatic identification of the source of three-dimensional images , as well as human-OSD function interface . 2 .

脉冲波形占空比的数字化测量及不确定度分析

The Digital Measurement Method of On-Off Ratio of Pulse Waves and the Analysis of Uncertainty

周期脉冲信号占空比变小，使检测到的最小脉冲幅度变大；

Because occupied space ratio of the periodic pulse signals diminishes , the detected minimum amplitude increases .

本文采用了一种变步长的扰动方法来改变触发脉冲的占空比，能够准确和快速地实现对最大功率点的跟踪，使系统处于最佳的工作状态。

A variable step disturbance observation algorithm is proposed . Through change the duty cycle of the trigger pulse , it can quickly and accurately track the maximum power point .

提出了一种将常用的六个扇区细分成十八个扇区，并根据转矩误差实时确定输出电压脉冲的占空比&即作用的有效电压矢量幅值的新型直接转矩控制方法。

A novel DTC strategy of PMSM is proposed . In this method six sectors are subdivided into eighteen sectors and the duty ratio is computed according to torque errors , i.e. active voltage vectors amplitude .

介绍了脉冲波形占空比的3种数字化测量方法，它们分别是直接脉宽测量法、幅值统计测量法和平均值测量法。

In this paper , three evaluation methods about the on-off ratio of pulse waves are introduced , they are the direct pulse width measurement method , the amplitude statistical method , and the average measurement method .

正常时，通过控制投切的电容器组，实现可控串联补偿功能，故障时，通过改变脉冲的占空比可以得到变化的阻抗，达到可控限流目的。

The compensation is controlled by the capacitors ' switching on and off in steps , while variable reactance can be realized on duty of ratio control , and the goal of controllable current limitation can be achieved .

其次，极窄脉冲的占空比很低，这导致了时域上非常精细的分辨率，接收机要完成信号的捕获，需要搜索的空间会非常大。

Secondly , it is difficult to complete the acquisition of the received signals , for the search space is very large due to the fine time resolution caused by the low duty cycle of the ultra narrow pulses .

脉宽计数法是将保存在锁存器中的二进制图像的灰度信号，与计数器中的数值通过比较器比较，由计数器和比较器来控制脉冲的占空比，从而达到调制灰度信号的作用。

Pulse width counting method is to compare the grayscale signal from binary image that stored in the latch , with the value in the counter . The counter and comparator control the duty cycle of the pulse in order to modulate the grayscale signal .

试验表明，提高线圈电压有助于实现电磁阀快速开启，开启脉冲和PWM占空比决定了不同阶段电流的大小，三者的有机调节，可以实现理想的电流波形。

The result indicates that increasing the voltage exerted on the winding is conducive to quick response of solenoid , and the opening pulse and PWM pulse duty factor determine the magnitude of current in different phases .

系统为反激式开关电源，采用脉宽调制（PWM）式控制方式：固定开关频率，通过改变脉冲宽度改变占空比。

The system is an arc - impetus switching power supply , adopting the pulse - duration modulation ( PWM ) control mode : the fixed turn - on frequency , occupying the spatial ratio along with the change of pulse width .

这其中包括修整电源的电压、电流、脉冲频率、占空比。

It includes voltage , current , pulse frequency and width of dressing source .

结果表明：脉冲频率和占空比的变化对镀层的硬度都有很大的影响；

The results show that the variation in duty ratio and pulse frequency had a great influence on the hardness of deposite .

结果表明，镀层的沉积速率、镀层成分及镀层的性能都随脉冲频率和占空比的变化而变化；

The results show that the deposit rate , composition and properties of coating change with the variation of duty ratio and pulse frequency .

该电路具有模拟和脉宽调制两种输出方式，能够将差分电容的变化通过模拟电平和输出脉冲信号的占空比表征，实现了对差分电容式加速度传感器信号的测量。

The circuit has two output modes . The change of differential capacitance , which carries the acceleration , can be denoted by analog level and pulse duty factor .

研究表明，抽运光的脉冲部分及其占空比对于输出脉冲波动的影响存在最佳值；

It is shown that there are an optimum pulse part and duty ratio affecting the instability of pulse series , and DC part and the pumping rate affect the output characteristics visibly .

通过验证性实验对峰值电压、基值电压、脉冲频率、占空比等参数的调节证明了控制器的功能性和可靠性，对高效化焊接方法和新型多丝脉冲焊机的研制具有指导意义。

Welding parameters are optimized by adjusting the peak and base voltage value , pulse frequency , duty ratio and so on . It can be guide of high-efficient welding method and new Multi-wire pulsed welding machine .

单片机对焊接电流、电弧电压、电流给定、脉冲周期、占空比、基值电流、收弧电流衰减时间、前气和后气时间等焊接参数进行采样、计算和控制。

The welding current , arc voltage , preset current , the period and ratio of pulse , base current , down slope time , gas pre and post flow time are sampled , calculated and controlled by microprocessor .

高精度光电测距仪中，超高频脉冲调制信号占空比仅1/250，通过光电转换技术可以提高接收信噪比，保证同步测相的灵敏度。

The duty ratio of the pulse signal with UHF modulation is only 1 / 250 in electrooptical-precise distance meter . A new photodetection can increases the receiving signal-noise ratio to ensure the sensitivity of the synchronous phase detection .

高压足以克服直肠的任何阻力，直肠阻力的变化只改变脉冲的时间占空比，不改变平均速度的恒定。

Being high pressure , any rectal resistance may be overcome . Any rectal resistance change does not change the invariableness of the average speed of the stream however , causes change on duration ratio of occupy to vacancy of the pulse .