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通信电源发展概况.doc
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通信电源发展概况.doc
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通信电源发展概况
他为分公司培养出了鲁付凯、孙垚、徐童晨、肖大鹏四名测量员,他们现在个个都能独当一面。warmly, welcoming us to join forces, and saw my fill of ... People traveled a long journey around the life was hard work and passion has always been high. Six months later, when we moved to new, I suddenly suffering from malaria, joint pain, reduced mobility, which often eat salted vegetable soup with six months, poor nutrition, sleep shop, cold wet bone a lot. Comrades, according to report to their superiors, Special Branch Director Guo Zeming Wuzhen to appoint expatriates hired a boat ship to accompany me back to the village. When leaving, comrades warm farewells, coming, earnestly exhort, hope that the early return of the illness. 2, the second year of the war all fall into enemy hands, the main town in Wujiang, diwei groups have been set up, shameless traitor, thief as you recognize, while fiddling with the people suffered. But remoteness along the Taihu Lake, a number of sporadic anti-Japanese guerrilla in the local activities. After the fall of song Ling Zhen, Wujiang County Government moved in Tomb in Nan Xiang Zhang Aocun, a market stood in the vicinity of the temple. Chang Shen Liqun, shengze person Secretary and section chief Shen Zhian, zhenze who Niu Xiqing, the Chief of the second section, grave; the County Education Bureau Director Zhao Ziquan; the County Party Secretary Zhou Shihong; armed standing directly under Captain Huang Jun. Also appointed district head, flow working separately in each country. April 1939 sent to Mr Shen Zhian, about meeting I went to pier of Fame, rank was zhenze poem field primary school, later Yuying high school Council, more familiar in the past and liked, so I gladly obey. Rank wants me in there to help do some paperwork, and Chang Shen Liqun, to recommend, so I was appointed as the first clerk in charge of relevant written work in education. County Government departments the staff scattered around the farmhouse,
第一章 绪论
1。1 国内外通信电源发展概况
电源技术属于电力电子技术的范畴,是集电力变换,现代电子,自动控制等多学科于一体
的边缘交叉技术,现今已广泛应用到工业,能源,交通,信息,航空,国防,教育,文化等领
域。
通信电源在整个通信行业中所占比例虽然不大,但它是整个通信网络的关键基础设施,是通
信网络上一个完整而不可替代的独立专业。随着电信技术的飞速发展,电信网络结构日益复杂,
信息技术的发展又对电源技术提出了更高的要求,例如节能,节电,节材,环保,可靠,安全等,
这就迫使电源工作者朝着高效率节能,网络化管理,全数字化控制,低电流谐波处理技术(绿色
能源)的方向研发拓展和不断探索,并利用各种相关技术制造出合格电源产品,以满足现代通
信网的技术要求
]1[
.
目前,通信电源大多采用高频开关电源代替相控电源,用阀控式密封铅酸蓄电池代替防酸
式铅酸蓄电池,用计算机监控系统代替传统的人工控制技术,完成通信电源的更新换代工作.
近年来,随着技术的进步,特别是功率器的更新换代,新型电磁材料的不断使用,功率变换
技术的不断改进,控制方法的不断进步,以及相关学科的技术不断融合,通信电源在系统的可
靠性、稳定性,电磁兼容性,消除网侧电流谐波、提高电能利用率、降低损耗、 提高系统的动
态性能等等方面都取得长足的进步。此外,由于计算机监控系统在通信电源 中的广泛应用,也
使得电源的智能化程度不断提高,系统维护管理能力不断得到加强;而 完善的接地系统和防雷
措施进一步提高了电源的平均无故障时间 MTBF。目前,通信电源正 向高频化、高功率密度、高
功率因数、高效率、高可靠性、高智能化方向发展。
我国通信电源走过一条引进技术、合资生产、自主研制开发的道路.由于通信电源市 场前
景好,产品的附加值高,所以,国内不少的科研院所、厂家投入大量的人力和物力,研制开发性
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