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The foundation of this system provides a good reference to promote the standardization and intelligence of the overhaul and maintenance of vacuum switches. This paper develops a special HF pulse power supply for internal pressure estimation, which achieves the output of HF-HV sinusoidal pulse wave whose frequency and amplitude can be modified respectively, and meets the design requirements according to the results of Simulink simulation and practical experiments. With the help of AT89S52, this paper designs an I~2C serial bus based signal detection system for peak value signal acquisition of HF pulse currents, which communicates with the upper computer by asynchronous serial communication for uploading the data. In the upper computer, a human computer interface is developed by Matlab software, whose functions are to do some computation and graphic display, such as calibrating the relation curve of vacuum degree and peak value of HF pulse currents, vacuum degree computation, and vacuum lifetime evaluation analysis basing on grey forecasting model as well as making relative suggestions.

本文研制了用于真空度检测的高频脉冲电源,通过Simulink仿真和试验检验其满足设计要求,实现了电压幅值和频率独立可调的正弦波高频高压脉冲输出;利用以AT89S52为核心基于I~2C串行总线的信号检测系统实现高频脉冲电流峰值信号的采集,通过异步串行通信实现单片机与计算机之间的数据通信,将检测数据传至上位机;在上位机利用Matlab开发人机交互界面,实现相关数据处理和图形显示,包括真空度——高频脉冲电流峰值关系曲线标定、真空度数值计算、基于灰色预测模型的真空寿命评估分析和提出相应决策建议。

With the multiple spectrum character of the ultrasonic generator, an impedance model of ultrasonic transducer under the triple frequency harmonic is built.

本文利用超声电源的多频谱特性,推导出超声换能器在谐振频率三次谐波下的阻抗模型。

14 UNIT, LINEAR DESIGN - A unit employing a branch circuit frequency transformer design where operation is not dependent on circuity ."

" 2.14 UNIT, LINEAR DESIGN——使用支线电路频率变压器设计,其运行独立于电路系统的电源单元。"

Log-domain companding technique takes advantage of the exponential I/V characteristics of the active devices such as bipolar junction transistors, compressing the dynamic range of the input sigal and reducing internal voltage amplitudes, it can maintain large dynamic range and high operating frequency under low supply voltage , the main area of application for this technique is the implementation of continuous-time fully integrated filters with low voltage, wide dynamic range, high-frequency, and wide tenability.

对数域压扩技术利用BJT晶体管等有源器件的指数Ⅰ-Ⅴ特性,对信号作对数压缩处理,大大降低了电路内部节点电压的摆幅,能在低电源电压下保持大信号动态范围和高工作频率,该技术的主要应用是设计具有低电压、宽调谐范围、高工作频率和宽动态范围特性的连续时间全集成滤波器——对数域滤波器。

However, the effect of which is directly related to the voltage, frequency and wave form of power source.

而介质阻挡放电产生等离子体的效果直接与电源的电压、频率和波形相关。电压、频率越高、放电效果越好。

In a homodyne unit, we take advantage of the Gunn oscillators' instabilityby varying the DC supply to "push" the frequency slightly.

在简单型耿儿单元,我们利用耿氏二极管振荡器的频率不稳定的优点,通过改变直流电源把频率拉偏一点儿。

The working frequency: frequency of demanding action, the structure should be optimized direct-acting solenoid valve, the power to listen to the exchange preferred.

工作频率:动作频率要求高时,结构应优选直动式电磁阀,电源听优选交流。

The working frequency: frequency of demanding action, the structure should be optimized direct-acting solenoid valve, the power to listen to the exchange preferred.

三、事情频率:动作频率要求高时,布局应优选直动式电磁阀,电源听优选交流。

Switching Power Supply has three kinds of control circuits: Pulse Width Modulation, Pulse Frequency Modulation, Pulse Width and Frequency Modulation.

开关电源有三种控制方式:脉冲宽度调制、脉冲频率调制、脉冲宽度频率调制。

With Linear Time-Invariant modeling of phase noise and definition of"effective resistor", we analyze the critical parameters of the circuit and calculate the value of phase noise at the 1 /f~2 region. 3. A 4.2GHz VCO tuned by an accumulation-mode MOS varactor in TSMC 0.35μm SiGe BiCMOS process is obtained after debugging with the simulator SpectreRF.

以低压、低功耗、低相位噪声和较大调谐范围的设计目标对压控振荡器进行设计优化,最后得到由积累型MOS变容管调谐的压控振荡器,电源电压为1.5V,功耗约10mW,中心频率为4.2GHz,调谐范围为28%,在频率偏移量为600kHz处的相位噪声为-128dBc/Hz,与线性时不变模型下的理论推导结果非常接近。

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