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S7-200 PLC can control frequency converters, sensor and stepping motors is introuced. This control system can implement initiative tub wheel closeloop speed control, passivity tub wheel strength control.

介绍了S7—200PLC在电缆对缠机中实现对变频器、传感器、步进电机三者的协调控制，从而实现了其主动鼓轮的速度闭环控制和被动鼓轮的拉力闭环控制。

Soft switching can improve the converters efficiency and reduce EMI. In comparison of some methods of approaching soft switching, this thesis presents a Diode Auxiliary Resonant Commutating Network which is composed by an auxiliary bridge and a resonant commutating inductor. This topology not only well realizes zero voltage switching, but also overcomes the parasitic oscillation in the secondary side Diodes. Simultaneously, this topology makes both the secondary side diodes and auxiliary diodes operate on the soft switching state too, which reduces more switching losses and provides requirement for the system to run stably under the condition of self-cooled.

软开关能够提高变换器的效率和降低EMI，通过比较目前多种实现软开关技术方案，本文研究了一种由辅助桥臂和谐振电感组成的二极管辅助谐振换流网络，不但很好地实现了ZVS，并且克服了副边二极管上寄生振荡；同时，该拓扑也使副边二极管和辅助二极管都工作于软开关状态，进一步降低了开关损耗，为系统能够在自冷的条件下稳定运行创造了条件。

Effects of output voltage ripple on the stability of current-mode Boost converters is studied in this paper.

研究了电流型Boost变换器输出电压纹波对变换器稳定运行的影响。

In particular, it is found that the output ripple voltage of boost and buck DC-DC converters are related to the duty ratio of input pulse.

本文提出了开关DC-DC变换器的线性空间建模法，并将其成功地用于升压型和降压型DC-DC变换器的分析，首次导出了上述两类变换器的输出纹波表达式，特别是输出纹波与控制脉冲占空比之间的关系。

A new modeling method for DC-DC power coverter is proposed in chapter 3, and it is applied to the analysis of output ripple voltage of boost and buck DC-DC converters.

本文提出了开关DC-DC变换器的线性空间建模法，并将其成功地用于升压型和降压型DC-DC变换器的分析，首次导出了上述两类变换器的输出纹波表达式，特。。。

To the question of regulating the output voltage and avoiding ripple of series resonant converters, State feedback controller is designed with conversation of energy.

为了调整输出电压及解决纹波问题，本文从能量守衡的角度设计串联谐振变换器的无源性状态反馈控制器。

The status quo of the development of the high voltage high power conversion technology is summarized in chapter 1 and two interrelating technology developments - power switching devices and digital control technology, are introduced. In chapter 2, the topologies of multilevel converters and control schemes are summarized. Moreover, their advantages, disadvantages and application fields are also analyzed and compared.

本文首先在第一章中对高压大功率变流技术研究现状进行了回顾，并对与多电平变流技术紧密相关的电力电子功率器件、数字控制技术的发展情况做了介绍；第二章对目前多电平变流器的电路拓扑和控制策略进行了总结，并将各自的优缺点和应用场合加以分析、比较。

Working closely with converters, the team secured 100% recycled corrugated for the shipper, poly bag, and black HDPE thermoformed cushions, which come from ReFlex (www.reflexpack.com).

工作组密切配合转换器，该小组有担保100 ％回收的瓦楞纸托运人，聚袋，和黑色高密度聚乙烯热垫，其中来自反射（ www.reflexpack.com ）。

For the first time, twin turbochargers and the exhaust-cleansing catalytic converters are placed between the V-8's two cylinder banks.

第一次，双涡轮增压器和排气清洁催化转换器之间放置的V - 8的两缸银行。

Keyboard function set through waveform type,frequency,amplitude,duty cycle,and other parameters of a signal to the microprocessor 89C51 control,MAX038 generated by the various signals,In this process,four-channel signal through D/A converters have simulated voltage and current,It transported up through the analog signal amplification,it enters the frequency MAX038 coarse-IIN,fine-tuning FADJ end,the duty cycle control-DADJ. In its COSC port received a three relays and oscillation frequency capacitance as a choice.

通过键盘设定函数波形种类、频率、幅度、占空比等参数的一个信号进入单片机89C51控制，由MAX038产生各种波形信号，在此过程中信号通过四通道D/A转换器产生模拟电压和电流，它再通过运放将模拟的信号放大，它进入MAX038的频率粗调端IIN、微调端FADJ、占空比控制端DADJ、在它的COSC端口接一个继电器和三个振荡电容作为频率选择。

Listen,point and check your answers.

听，指出并且检查你的答案。

Warming needle is one of effective treatment methods for knee arthralgia aggravated by cold,and it is simple,safety,so it should be developed in clinical acupuncture and moxibustion extensively.

但以本院科针灸门诊在2005年1月—2006年6月期间共收治膝痛患者100余例，经过临床的诊断后，其中施以温针治疗的48例，疗效显著，报道如下。1临床资料本组病例48