纹波电流

The structure of the design include a nucleus manipulator (AT89S52 ), the current , sampling, comparision amplification, A/D, D/A converter, keyboard display, and so on .

本设计是基于单片机的一种数控电源，与一般电源相比具有宽范围电流输出、可修改性所需电流键盘输入、两级步进调节、输出电流及设定电流显示、负载两端电压显示、纹波系数小等特点。

In order to optimize performances of shunt active power filter of harmonic compensation, attenuation ratio for switching ripple, stability and power losses, an improved LCL filter topology was presented based on the analysis of the frequency characteristics of the LCL filter, in which a switching-ripple shunt branch and a series-inductor were adopted to the damping resistor to reduce the power losses dramatically.

为了使并联有源滤波器谐波电流补偿性能、开关纹波衰减率、系统稳定性和功率损耗等方面性能得到系统的折中和优化，提出了一种改进型LCL滤波器拓扑，该结构充分利用了LCL滤波器的频率特性，在阻尼电阻两端引入开关纹波谐振分流支路，同时在阻尼电阻上串联一小电感，有效的减少了阻尼电阻的损耗而不改变系统的静态和动态性能。

To overcome these drawbacks, the application of current mode tri-state modulation technology to the switching power amplifier for magnetic bearings is proposed, as well as its special advantages.

文中首先分析了电流纹波对磁轴承系统的影响，接着分析了电流两态调制技术本身的固有不足及电流三态调制技术在磁轴承开关功放应用中的优势。

The ways of parallel resonant DC link and three-level control strategy were used in this power amplifier circuit. Output current ripple of power amplifier can be reduced as three-level power amplifier, all of power switches work on and off under the zero voltage switching or zero current switching, loss of switching and current ripple interference effectively reduced.

该电路在功率放大器三电平控制策略的基础上应用了并联谐振直流环节，保持了三电平功率放大器输出电流纹波小的优点，同时功率器件均工作在零电压或零电流条件下，开关损耗、电流纹波干扰有效地减小。

A zero rippled input current and continuous output current Buck-Boost converter topology converter was proposed.

针对传统Buck-Boost输入输出电流断续的缺点，提出一种基于独立电感零纹波输入电流和输出电流连续的Buck-Boost变换器，详细分析了变换器的稳态工作原理。

The objective of design optimization for the current loop is to maximize the cross-over frequency. The results show the stability is improved and the capability of suppressing the switching noise is far better than the original. The objective of design optimization for the voltage loop is to minimize the gain of the line ripple voltage.As a result the bandwidth minishes obviously and optimization design excelles in restraining the ripple.

主电路以总体积最小为优化目标，优化结果表明电路的体积减少了0.5%；电流环以开环穿越频率最大为目标，优化结果表明电流环的稳定性能得到了改善，开关噪声抑制能力明显优于优化前的；电压环以线纹波电压增益最小为目标，优化结果表明电压环的带宽明显减小，纹波抑制能力远远优于优化前的。

Input voltage ripple and total RMS input ripple current are reduced by synchronized 180 out-of-phase operation.

输入电压纹波和总RMS输入电流纹波减少180同步进行反相操作。

Experimental results show that this digital power amplifier has the characteristic of low current ripple, quick current response and high stability.

实验结果表明，数字功率放大器具有电流纹波小、稳定性能好和电流响应快等优点。

Excessive ripple current, beyond what the capacitor is rated for, will destroy the capacitor.

过度纹波电流超出了电容的额定，会破坏电容器。

Finally, the simulation of the system and the experimental results of PWM rectifier are presented. The results of the simulation and experiment indicate that the input power factor is close to 1, the output voltage of the rectifier is stable and the high quality charge and discharge: current of the accumulator is achieved, current ripple is small.

本文最后给出了系统的仿真和PWM整流器实验波形，仿真和实验的结果表明：系统实现了输入功率因数接近1，变流器输出电压稳定；获得了较高质量的蓄电池充放电电流，电流纹波小。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。