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With the development of electronics industry, DC/DC converters have been widely used in many electronic equipments.

随着消费电子产业的蓬勃发展，DC/DC转换器在各种电子产品里得到了广泛的应用。

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。

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。

So this paper models DC-DC converters as switched linear systems, introduces projection strategy conception of switched linear systems, and proposes control strategy of switching rule based on min-projection strategy.

为此，该文建立DC-DC变换器的切换线性系统模型，引入切换线性系统投影法的概念，提出最小投影法切换律的控制策略。

The Company also produces a variety of specifications, the low-power AC / DC, DC.

本公司还生产各种规格的中、小功率AC/DC、DC。

Trollers, point of load DC/DC controllers and converters with integrated MOSFETs, low dropout and linear regulators, and power

MOSFET 的负载点 DC/DC 控制器及转换器、低压降及线性稳压器以及电源接口开关等产品。

In this paper, with the Buck circuit topology as the exampleof zero-transition soft-switching PWM DC/DC converters, theoperation principle and characteristics of the conventionalZVT-PWM converter and a novel two phase ZVT-PWM converter areanalyzed in-depth respectively.

文中以Buck型电路拓扑作为研究零过渡PWM软开关DC／DC变换器的代表，分别对传统ZVT-PWM变换器和一种新型的两相ZVT-PWM变换器的工作原理及特性进行了深入的分析。

Part III: Peripheral blood dendritic cells in coronary atheroscleroticdiseaseObjectives: Dendritic cells subsets, Myeloid DC and plasmacytoid DC, regulate immune reactions by polarising naive T-helper cells into a Th1 or Th2 response, respectively.

第三部分：冠心病患者外周血树突状细胞亚型的变化的研究目的：树突状细胞的两个亚型，髓样DC和浆细胞样DC分别是促使T辅助细胞向Th1和Th2免疫应答转化的抗原呈递细胞。

This research improves the impedance marching method, by varying duty cycle in a DC-DC converter to make the apparent load impedance matching with current system impedance, and reach the mpp operation.

本论文是改善阻抗匹配法，使其在不同照度下皆能准确做最大功率点追踪，并且应用阻抗匹配法在实际的太阳光能发电系统，经由调整DC-DC转换器中的主动开关之责任周期来达到负载与太阳能板的匹配，达成最大功率传输。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。