电源电压

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。

We make use of a micro-cell network model and a planar heat source, based on the atomic layer thermopile model, to obtain a time-dependence formula of the effect.

我们通过建立微电源网络模型、瞬时平面热源模型并结合原子层热电堆模型，得到了随时间变化的激光感生电压公式。

RG resistance is uranium metal plating on the top bar magnet, has excellent impact resistance characteristics and high voltage, high reliability, pulse load capability, low voltage coefficient of performance, widely used in communications equipment, high-quality power supplies and other areas .

RG 电阻是用金属铀镀于磁棒上面，有着极佳的耐冲击特性及耐高压，可靠性高、脉冲负载能力强、电压系数低等性能，广泛地使用于通讯设备、高质量电源等领域。

According to initial police investigation to determine, electric shock may be caused by the use of Game Boy and the European version does not conform to the power supply voltage caused by, and therefore is likely to be an unfortunate accident.

据调查案件的警方初步判断，触电可能是由使用与欧洲版Game Boy电压不相符合的电源所引起的，因此很可能是一场不幸的事故。

A 3kW prototype converter is built to verify the effectiveness of the improved converter and the best scheme for the blocking capacitor, and the experimental results are also included in this paper.

本文将改进型零电压全桥变换器应用于高压直流二次电源DC／DC变换器中，研制出一台3kW工程样机，并给出实验结果。

The converter combines the advantages of the PWM technique and soft-switching technique, the PWM is effected all over the whole loads range, and soft-switching is effeted only in the switching transition period, the ZVS of leading-leg is achieved by using the energy stored in leakage inductor of the transformer and the output inductor, the ZCS of lagging-leg is achieved by using a blocking DC capacitor, the ZVS and ZCS are achieved for the whole load ranges (5A~250A).

控制电路采用相移控制方式，综合了PWM控制和软开关技术的优点，在大范围内实现PWM控制，而在功率器件换流期间实现软开关换流，其中超前桥臂利用变压器的漏感，实现了零电压开关，滞后桥臂利用隔直电容，实现了零电流开关，并且整个变换电路能在（5A~250A）的范围内实现软开关工作条件，满足弧焊电源负载变化大的特点。

A: This may be a problem with the motherboard, please check the main board of the output voltage is normal, also can try to replace a power supply chassis.

答：这可能是主板出了问题，请检查主板的输出电压是否正常，另外也可以尝试更换一个机箱电源。

On the basis of the above results of detecting methods, the instruction signal calculating circuit is designed according to i〓, i〓 calculating mode. Compensation current generating circuit is also designed and implemented. Its current following circuit is designed according to the instantaneous value comparing mode that used constant time control. The source current detection based control mode and composite control mode and their implementation are firstly introduced in our country. The method and the principle of dc side capacitor voltage control are explained clearly.

根据检测方法的研究成果，采用i〓、i〓运算方式构成并联型电力有源滤波器的指令电流运算电路；对补偿电流发生电路进行了电路设计和实施，其中电流跟踪控制电路采用电流跟随性能好、可靠性高的定时控制瞬时值比较方式；在国内首次研究并实施检测电源电流控制方式和复合控制方式；清楚地阐明了并联型电力有源滤波器直流侧电压控制的原理和方法，并在装置中实施。

The test results indicate that,because of the capacitive coupling between500kV high voltage line and400V power-supply line,high voltage was induced on the power-supply line during the isolator operation.

试验结果表明，开关操作时由于500kV串内连接线和400V电源线间存在电容耦合，在操作电源供电母线上有较高的感应电压存在。

"Exception No.1: A unit having resistive circuity , high-impedance winding , and the like , not subject to excessive secondary-voltage build-up in case of electrical breakdown during the test may be tested :"

"例外1：具有电阻性电路，高阻抗绕组以及类似物在测试时由于电击穿可能产生过高次级电压的电源单元，可以按下列方法试验："

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。