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This approach has the advantages of simple circuit, accurate detection and good robustness. Two kinds of topologies in Active Power Filter have been proposed, including APF based on cascade converter with phase-shifted SPWM technique and APF based on current source multimodular converter with phase-shifted SPWM technique.

本文提出了两种基于相移SPWM技术的并联型有源电力滤波器的拓扑结构：基于相移SPWM级联型变流器的电压源型APF，基于电流型相移SPWM组合变流器的电流源型APF。

Five versions of the vane cascade systems for the torque converter with the same basic geometric parameters were designed and the steady comparative experiments of these 5 versions versus the base version of W305 torque converter were performed.

在基本几何参数一致的基础上，设计了5种液力变矩器叶栅系统方案，并且对包括W305型液力变矩器比较基型在内的6种方案进行了稳态试验比较分析。

This paper analyzes on the faults of the frequency-converter of the coal cutter, and introduces the developing schemes, principles and applications of the vibration test stand of the frequency-converter.

分析了采煤机变频器的故障，介绍了变频器振动实验台的研制方案、原理以及使用情况。

The automatic control system includes system unit and accessory equipment as well as AD converter, DA converter, memory SCR current convertor, hydraulic valves, pumps, voltage, current and pressure transmitters, switching amount I/O board, top hammer, valve position collector, displacement sensor, hexahedron crown and synthesizing block.

一种六面顶高压合成压机自动控制系统，包括：主机及其附属设备，还有A／D、D／A转换器，存贮器，可控硅变流器，液压阀组、泵组，电压、电流、压力变送器，开关量输出、输入板，顶锤、阀组位置采集器、位移传感器，六面顶，合成块。

Then the paper presents a novel-working mode of Boost-Forward single-stage Power Factor Correctors based on the analysis. And get the principle of the conduction mode and the method to control the voltage of the buck capacitor after the analysis of the boundary mode of the PFC converter and the DC-DC converter.

在此基础上，本文首次提出了一种全新的临界工作模式下的单级功率因数校正电路，在对PFC变换器及DC/DC变换器工作在连续及不连续的边界条件进行了讨论后，得出了电路工作状态的精确解并提出了控制储能电容电压的临界点工作方式。

MD are analog sensors, the digitizing happens when the electrons are passed through the analog to digital converter. The A to D converter converts the analog signal to a digital file or signal.

CD 属于模拟传感器，当电子从模拟转换传输到数字转换器时实现数字化。A/D转换器将模拟信号转换到数字文件或信号。

In the medium and high power SMPS, phase shifting controlled ZVS PWM full-bridge converter is favour topology. But in this converter, ZVS is difficult to be achieved for the lagging leg at light load.

在中大功率应用中，通常采用于移相控制ZVS PWM DC/DC全桥变换器，该电路在轻载时难以实现滞后桥臂的零电压开通。

Compared with the conditional PS-FB DC/DC converter, it nearly decreased half of the circumfluence energy, and realized ZVS of the lagging switches in a wider load scope with a dinky duty circle loss. It improved the efficiency of the converter effectively.

与传统电路相比，它将近降低了1/2的开关管的环流能量损耗，并且能够在较宽的负载范围内实现滞后管零电压开关和极小的占空比丢失，有效地提高变换器的效率。

The positive converter makes the load current to be positive in trigging control, while the negative converter is negative.

系统建模在实际确定的导通模式基础上加上两管换流模式和正负换组模式；触发控制中正组变换器使负载输入电流为正，负组变换器使其为负。

One structure of using V/v connection and three phase three leg converter under direct or BT supply, one structure of using two single phase converter and V/x connection under AT supply are both researched and simulated detailed.

系统整体结构设计后，以直接供电或BT供电方式下，采用V/v接线变压器和三相三桥臂变流器，及AT供电方式下，采用V/x接线变压器和两个共用一直流环节的单相变流器的系统结构为对象，分别进行详细研究和仿真。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。