Some of researchs of the dc source system are introduced in the thesis . the main contents are follows : firstly , a kind of dc source system based on the distributed system is given . secondly , the design and realization of the switching source charger with phase - shifted zero - voltage - switching converter is discussed particularly . then the analysis of the control system of the charger is processed and a way of current sharing composed of the droop method and the master - slave method based on the random switching of the master is givea thirdly , the design and realization of each measure and control unit isintroduced 本论文介绍了作者研究和开发直流电源系统的若干成果,主要有:给出了一种基于分布式架构的直流电源系统;详细介绍了全桥移相零电压软开关高频开关电源充电机的设计和实现过程,对充电机的控制实现过程进行了详细分析,提出一种输出阻抗法和主机随机转换的主从法相结合的均流方法;对直流电源监控系统各个前级测控单元的设计和实现进行了分析,重点介绍了蓄电池巡检单元、绝缘检测单元、母线调压单元的设计和实现过程;开发了一个基于组态软件构架的直流电源系统后台监控软件;最后介绍了在开关电源、通讯、单片机系统设计中采取的一些抗干扰措施。
Adopting archimedes number arq as similarity standard , the author determine every kind of similarity scale according to geometry scale 1 / 18 and other limit condition , at the same time , complete organization of model essence , simulation heat source system , design and arrangement of air supply and exhaust system according to every kind of similarity scale 采用热量阿基米德数arq作为相似准则,按照1 / 18的几何比例尺以及其他制约条件确定各种相似比例尺。根据各种相似比例尺完成模型本体结构、模拟热源系统及模型送排风系统的设计和配置。
Scenario 2 expands the virtualization concept by showing that the r d company also stores data in data source systems such as relational dbms , flat files such as xml , databases containing e - mails and documents , and content management systems images , drawings , or documents 通过展示r & d公司仍将数据存储在数据源系统中,场景2扩展了虚拟化的概念,这些数据源系统包括关系型dbms 、平面文件(如xml ) 、包含电子邮件和文档的数据库,以及内容管理系统(包括图像、绘画、文档等)等。