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converter
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     Z-Source Converter
     Z源变换器
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     The application converter in measurement
     在测量仪器中不要前端放大器的设计
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  converter
Thus, it is proved theoretically that the intermittency in switching power converter can be explained in terms of coupling of spurious interference.
      
A zero-voltage zero-current soft switching DC/DC converter
      
A novel three-level zero-voltage zero-current switching (ZVZCS) DC/DC converter is proposed in this paper.
      
The converter achieves a zero-current tuning off for inner switching, and a zero-voltage tuning on for outer switching.
      
Method of internal 3D flow field numerical simulation for hydrodynamic torque converter
      
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This paper describes a detailed analysis of conversion properties of junction transistors. A new parameter "the effective conversion transconductance" is introduced for characterizing transistor converters. The effective conversion transcon-ductance of transistor converters using a PNP transistor operated at different oscillatory conditions and at various signal frequencies are studied. Main differences between transistor converters and vacuum tube converters are compared.

本文讨论面结型晶体管变频性能的分析。提出新参数“有效变频跨导”来决定晶体管变频器的特性。研究晶体管变频器在各种振荡状况下及不同讯号频率时对有效变频跨导的影响。比较晶体管变频器与电子管变频器的主要区别。

An electronic circuit which may be applied to the control of firing angle of high voltage mercury arc current converter is suggested in this paper.The circuit mainly consits of two parts:the primary pulse generator and the secon- dary pulse former.Between these two parts is inserted an insulating transfo- rmer which transmits the control paise and isolates the high potential difference between them.The primary generator generates the control pulses and determinates their phase.The secondary pulse former...

An electronic circuit which may be applied to the control of firing angle of high voltage mercury arc current converter is suggested in this paper.The circuit mainly consits of two parts:the primary pulse generator and the secon- dary pulse former.Between these two parts is inserted an insulating transfo- rmer which transmits the control paise and isolates the high potential difference between them.The primary generator generates the control pulses and determinates their phase.The secondary pulse former supplies the power, necessary for gridcontrol,and formes the configuration of the pulse.This circuit has been used in a model of high voltage d.c.power transmission system. Experimental result shows that the quality of the pulse in this system is better than that of the commonly adopted magnetic system,but the interference in this syetem needs eliminating.

本文提出了一种电子的栅极控制线路,可用来控制高压离子变流装置的工作。控制线路主要包含一次脉冲发生器和二次脉冲装置二部分,在这二部分之间有绝缘变压器,负责传递脉冲电压并隔离高电位。一次脉冲发生器负责控制脉冲的移相和产生;二次脉冲装置则完成脉冲的整形供给控制脉冲必要的功率,本钱路曾经用在直流输电模拟装置中;实验结果初步证明脉冲质量较现有磁性系统优越,但干扰问题有待改进。

The results presented in this paper may be classified into three categories. First, there is derived the characteristics of gain, bandwidth, and figure of merit of a non-degenerative parametric amplifier of both fundamental and sub-harmonic pumping; and the comparison between them is carried out in substantial detail. Second, there is devised an analytical method for determining the harmonic contents of the capacitance of a nonlinear semiconductor diode, which is negatively biased and is under the action of...

The results presented in this paper may be classified into three categories. First, there is derived the characteristics of gain, bandwidth, and figure of merit of a non-degenerative parametric amplifier of both fundamental and sub-harmonic pumping; and the comparison between them is carried out in substantial detail. Second, there is devised an analytical method for determining the harmonic contents of the capacitance of a nonlinear semiconductor diode, which is negatively biased and is under the action of a strong high frequency pumping voltage. The magnitudes of bias and pumping voltage are thus found quantitatively. Also, the stability requirements for pumping amplitude and pumping frequency are discussed. Third, the noise figure of a parametric amplifier itself and the effective noise figure of the amplifier loaded with a noisy second stage, which may be a frequency converter, are derived. Factors such as diode loss, match, and the bandwidth ratio of the signal to the idler circuit are all considered in the derivations so as to make the results with greater importance for practical applications. Finally, a numerical example is given to show the utility of the results presented in this paper and to illustrate a possible design procedure of a non-degenerative parametric amplifier.

本文主要结果有三:第一,推导出基波激励和次谐波激励参量放大器的优值、功率增益、和通带等主要特性,并就这些特性对基波激励源的和次谐波激励源的参量放大器进行比较;第二,通过半导体二极管非线性电容的谐波分量的分析,在激励电压、偏压和放大器的特性间得出定量关系,并且对给定放大器特性求出激励源幅度和频率的稳定要求;第三,推导出放大器的有效噪声,并给出最低有效噪声的设计条件。 以上特性的探讨和二极管损耗、信号迴路和镜象迴路通带比、匹配等因子结合在一起进行,使所得结果更具有实际意义。最后举出一数字例子,说明应用本文结果来设计参量放大器的一种可能步骤。

 
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