谐波失真

这种材料适用于低功率信号传输变压器（如ADSL变压器），可以降低变压器谐波失真，提高传输速率。

This material is suitable for low power signal transmission transformers ( such as ADSL transformers ), and can reduce harmonic distortion and improve transmission speed .

在一般正弦拟合法的基础上，提出正弦信号源谐波失真时测试A/D动态性能的一种新的近似求解法。

On the basis of studying the general method of sine fitting , a new approach of testing the A / D dynamic characteristic with the harmonic distortion existing is put forward .

一种高效率低谐波失真E类射频功率放大器的设计

Design of a high efficiency low THD Class-E RF power amplifier

移相式谐波失真度测量基于FFT的低频谐波失真度测试仪

Phase & shift harmonic distortion measurement The design of instrument of distortion measuring

同时运用ClassAB推挽电路作输出级，获得高驱动能力和低谐波失真。

Meanwhile , a class AB output stage is also developed to ensure large dynamic range , strong driving capability and low harmonic distortion .

并在实验样机上作了对比实验，结果表明基于PID控制和重复控制的复合控制策略具有优良的控制效果，对各种负载输出电压谐波失真度满足规定要求。

It can be seen from the experiment that the compound control strategy based on PID and repetitive control performs good dynamic and static performances .

方波型逆变器总谐波失真度（THD）与其负载Q值的关系

Relations between total harmonic distortion ( THD ) and load quality ( Q ) in square wave VSIs

分析了这种电压源逆变器的主要参数，如总谐波失真度（THD）和失真指数（DF）。

The major parameters such as THD and DF of this VSI are analyzed .

xDSL调制解调器变压器总谐波失真的影响因素分析

Analysis of Factors Affecting Total Harmonic Distortion of Modem Transformer for xDSL Telecommunication

通过设计高速高精度低功耗的比较器实现了一个3位FlashADC，采用一个新的量化反馈方式取代了子DAC模块，不会出现“signaldependence”的谐波失真。

A 3 bit FLASH ADC is realized based on the high-speed high-resolution low-power comparator . The DAC is replaced by the novel quantizer feedback to avoid " signal dependence " .

内部的功率因数校正（PFC）电路以临界导通模式（CCM）工作，可获得高功率因数、低总谐波失真（THD）及直流电压调整。

PFC circuitry operates in critical conduction mode ( CCM ) and provides for high PF , low THD and DC bus regulation .

运用了数字信号处理技术，可以得到测试非线性器件总谐波失真（THD）的方法。

Using the digital signal techniques , we can get the model of total harmonic distortion ( i.e. THD ) of the nonlinearity device .

实验结果证明，系统电动机电流的谐波失真较小，直流母线电压利用率比常规的正弦波脉宽调制（SPWM）有了较大的提高，功率器件的开关损耗较小。

Test results proved that the motor had lower current harmonic , more efficient use of DC supply voltage than SPWM , less switch loss of power switch .

由于前置了功率因数调整器，使系统的功率因数和总谐波失真表现良好，而基于原边控制的控制器能够精确的控制LED电流，并且省去了光耦和二次测控电路，有效的减小了体积。

The power factor correction makes the system power factor and total harmonic distortion performance well . Controller can precisely control the LED current upon primary side regulated ( PSR ) . It spare optocoupler and secondary side regulated control circuit .

最后，利用实际HEMT晶体管的测量数据说明了应用多谐波失真模型对精确分析非线性器件的重要意义。

The data obtained by measuring HEMT proves the significance of accurate analysis of nonlinear device using polyharmonic distortion ( PHD ) model .

实验结果证明了SVPWM的正确性，表明该系统实现算法简单、控制精度高、输出电流谐波失真小、有较强的实时性。

The experimental results indicate the correctness of SVPWM and the prototype has simpler software design , higher control precision , less output current harmonics distortion and better real-time performance .

此方法既剔除了信号源谐波失真对系统性能测试的影响，又可避免一般正弦拟合法中求解非线性方程组的麻烦，同时还能满足ADC性能测试的精度要求。

It not only gets rid of the influence of harmonic distortion but also avoids the trouble of getting the solution of nonlinear equations , and it can satisfy the precise demand of ADC .

选择优化后的EPX（EPO）型磁芯制作的变压器比同等封装尺寸下EP型变压器的谐波失真要低几个dB，或在变压器谐波失真未有太大改变的情况下缩小了变压器的封装尺寸；

The optimized transformer of EPX ( EPO ) has less several dB in THD than the transformer of EP when they have the same package size .

对于方波型逆变器，总谐波失真度（THD）不仅仅随占空比变化，而且受负载类型的影响。

In square wave voltage source inverter , total harmonic distortion ( THD ) is not only the function of duty cycle , but also with response to load 's type .

正弦脉宽调制（SPWM）和空间矢量脉宽调制（SVPWM）由于具有总谐波失真度（THD）小、开关频率恒定、实现方便等优点而在传统逆变器中得到了最为广泛的应用。

Sinusoidal pulse width modulation ( SPWM ) and space vector pulse width modulation ( SVPWM ) techniques are widely used in traditional inverters for low THD , constant switching frequency , convenient realizations etc.

在SPEC-4实际上有较低的总谐波失真低于其更昂贵的兄弟互调失真。

The SPEC-4 actually had lower total harmonic distortion and lower intermodulation distortion than its more expensive brother .

首先论文介绍了功率因数与谐波失真的定义，阐述了功率因数校正技术的重要性；其次描述了有源功率校正的原理及控制方式，分析了升压型电压模APFC系统的稳态特性。

The concept of power factor and harmonics distortion is described , then principle and control mode are presented and the steady-state analysis of boost voltage mode APFC system is detailed .

有源PFC可以得到较高的功率因数，总谐波失真（THD）小，可以在较大电压范围内工作，已经成为提高电源功率因数的最主要方法。

However , APFC is a dominating method of improving the power factor , for APFC , within the vast voltage range , can gain the higher power factor and less Total Harmonic Distortion ( THD ) .

介绍了直接数字合成正弦波的基本原理，并对合成正弦波的频谱进行了分析，重点讨论了利用最小二乘法测量合成正弦波的谐波失真度（THD）的方法。

The principle of direct digital synthesizing sine wave is introduced , the frequency spectrum of synthesized sine wave is analyzed , and the method measuring total harmonic distortion ( THD ) of synthesized sine wave using least square is emphasized .

实验结果表明，该逆变电源控制系统设计合理，在电梯能量回馈系统中采用SVPWM技术，既能提高能量回馈逆变电路对直流电压的利用率，又能减少逆变电能总谐波失真。

Experimental results show that the inverter control system is designed reasonably . SVPWM technique which is adopted in the elevator with energy feedback system can raise the energy utilization of the DC voltage for inverter circuit feedback , and reducing the total harmonic distortion of the inverter power .

模型的混合辨识分为两步：第一步是采用单频正弦信号作为测试输入，依据谐波失真抵消准则，辨识出并行Wiener-Hammerstein模型中的Wiener模块。

The hybrid model identification employs a two-step process : the first step uses a single-tone sinusoidal signal as the test input , and then accomplishes the identification of the Wiener module in the parallel Wiener-Hammerstein model according to harmonic distortion counteract based criterion .

采用输入级源退化电阻及输出级负反馈技术，使得差分输出峰峰值为1V时三阶谐波失真达到-60dB.同时利用反馈环路中反馈电容的欠阻尼滞后补偿作用，使放大器的带宽增大了15%。

A better than - 60 dB 3rd harmonic distortion at differential output level of 1 V peak-to-peak is obtained by utilizing the source-degeneration resistors and negative feedback technology . The bandwidth is extended by 15 % at the effect of the feedback capacitor .

直接数字合成正弦波谐波失真度测试方法

Method Measuring Total Harmonic Distortion of Direct Digital Synthesizing Sine Wave

频谱分析仪对谐波失真检定影响的分析

Analysis of the harmonic distortion calibration reaction by spectrum analyzer

介绍了谐波失真和总失真度的定义。

The definitions of both harmonic distortion and total distortion are introduced .