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ABSTRACT The theory of analysis and synthesis of DC-DC switching power converters are studied in this dissertation.

本文着重研究了DC-DC开关变换器的分析和综合理论的一些主要问题。

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。

DC to GND DC to BAT BAT, CHG, POK, USB to GND Operating Temperature Range Junction Temperature Range Storage Temperature Range Lead Temperature (soldering, 10s) Continuous Power Dissipation (TA =+70C) 5-Pin Thin SOT23 Derates above +70C 5-Pin Thin SOT23

直流接地直流英美烟草英美烟草，嗜铬粒蛋白2710 8860，USB到GND的工作温度范围结温度范围储存温度范围引线温度（焊接，10秒）连续功率耗散（电讯局长=+70℃）5引脚薄型SOT23封装Derates以上+ 70℃5引脚薄型SOT23封装

Beginning with the theory of the DC timing system,this article has built up the maths model of the reversible DC-PWM timing system with a dual-converter and dual-closed-loop,Given the details of the system design, software and hardware design, circuit structure and control algorithms using the PI process control proce- dures.

从直流调速系统原理出发，逐步建立了双闭环直流PWM调速系统的数学模型，给出了该系统的详细设计思路、软硬件设计、电路结构和采用PI控制算法的控制程序流程。

Beginning withthe theory of the DC timing system,this article has built up themaths model of the reversible DC-PWM timing system with adual-converter and dual-closed-loop,Given the details of the systemdesign, software and hardware design, circuit structure and controlalgorithms using the PI process control proce- dures.

从直流调速系统原理出发，逐步建立了双闭环直流PWM调速系统的数学模型，给出了该系统的详细设计思路、软硬件设计、电路结构和采用PI控制算法的控制程序流程。

The mathematic simulation software compiled by this paper has been used to simulate the basic characteristics of the main parts of the aircraft ac EPGS, include the permanent brushless dc generators , the exciters with rotating rectifiers, the brushless ac generators, the brushless dc generators, the inverters and the automatic voltage regulators .

运用本文建立的数字仿真软件对飞机交流电源系统的主要部件，包括永磁无刷直流发电机、旋转整流励磁系统、无刷交流和直流发电机、逆变器和调压器的基本特性进行了研究。

Bao'an District, Shenzhen City Powerchip electronic materials are the United States Global Soto Enterprise DC brand sole agent in China, jointly with the manufacturers franchise applied to printed circuit boards, liquid crystal display panel, light guide plates, film, precision printing, clean rooms, electronic semiconductor process of DC brand wheel manually clean dust, mechanical rollers, dust sticky paper, sticky paper dust, dust-free cloth, dust sticky mats, sticky rubber floor dust, isopropyl alcohol, ion Fan, paper / Wheel, Block and sticky dust drum accessories, such as Static and surrounding clean room supplies.

深圳市宝安区力晶电子材料是美国Global Soto Enterprise DC品牌中国独家代理商，与厂家联手专营应用于印制电路板、液晶显示面板、导光板、软片、精密印刷、无尘室、电子半导体制程的DC品牌手动清洁除尘滚轮，机械滚轮、粘尘纸卷，粘尘纸本、无尘擦拭布、粘尘垫、粘尘地板胶、异丙醇、离子风机、纸本/滚轮座及粘尘滚筒配件等防静电产品及无尘室周边耗材。

The expert system, worked on rule, adopted the discharge signal and DC leakage current value as its characteristic parameters, and then diagnosed the insulation state of DC feeder cable by the values of the characteristic parameters.

直流馈出电缆绝缘诊断专家系统采用基于规则的专家系统实现，系统通过采用数据处理后提取的放电信息，直流泄漏电流幅值信息作为电缆绝缘性能诊断的特征参数，进而根据所获得的特征参数值来进行直流馈出电缆绝缘性能的判别。

But at present the on-line monitoring technology was concentrated on AC cable, the relevant research on DC feeder cable was scarcely carried out around the world, and the on-line monitoring technology on AC cable can not be adopted. Then, in the thesis, the faults reasons were analyzed and fault models with real project were set up started with the faults of the DC feeder cable.

由于直流馈出电缆在线监测技术国内外未见报道以及交流电缆在线监测技术不能移植于直流馈出电缆在线监测的现状，论文首先从直流馈出电缆故障分析入手，分析了直流馈出电缆故障原因，建立了具有工程意义的直流馈出电缆故障模型。

It has been obtained that the main reason of decreasing of DC pollution flashover voltage with the dropping of pressure on the simple plane model is decreasing of the E-I performance of partial DC arc at low pressure.

本文从简单的平板染污模型入手，采用高速摄影等手段，仔细研究了常压及低气压下的直流和交流污闪情况。

For every one of my New Year resolutions, I have been a backslider for years.

说到我的新年决心，我每年都做

With empathy and focus on a feeling level, we can all relate to the common ground of mutuality of emotions.

有了同情心和感觉上一级的重点，我们都可以涉及到相互的情感共同点。