华为R4850G2直流一体化高效50A模块

　　华为R4850G2直流一体化高效50A模块

　　华为R4850G2是一款高效率、高功率密度的数字化整流模块,实现85~300VAC输入,53.5VDC额定输出的转换。具有软启动、完善的输入和输出保护、低噪音、可并联使用等优点。采用***新电源监控技术,实现整流模块及负载的实时监控、通过后台。

　　R4850G2特点

　　丨效率:≥96%

　　丨输入电压范围:85~300VAC

　　丨工作温度范围:-40+75℃

　　丨总谐波失真(THD):≤5%

　　丨支持在线热插拔功能

　　丨全数字化控制

　　丨支持智能电表

　　丨支持RS485通讯

　　丨支持电压电流调整功能

　　丨满足RoHS要求

　　丨通过TUV、CE、UL认证

　　R4850G1 R4850G2详细参数

　　尺寸 40.8*105*281

　　重量 ≤2kg

　　工作温度 -40℃~+75℃,55℃输出不降额

　　存储温度 -40℃~+75℃

　　相对湿度 5%~95%(无凝露)

　　工作电压 85~300VAC

　　输入电压制式单相三线制(或110VAC双火线)

　　输入频率 45~65Hz,额定值:50Hz/60Hz

　　输入电流 ≤17A

　　功率因素 0.99

　　THD ≤5%

　　输出电压 42~58VDC 默认输出:53.5VDC

　　输出功率 3000W

　　C114 News May 24 (Lin Xiang) At the 41st working meeting of the 18th Development and Examination Commission in 2019, China Satellite Communications'initial application was approved. China Satellite intends to publicly issue no more than 400 million shares on the Shanghai Stock Exchange. It plans to raise about 1.28 billion yuan through the IPO, of which 100 million yuan will be used to supplement liquidity, and the rest will be invested in the Zhongxing 18 satellite project.

　　Zhongxing 18's investment recovery is about 13 years

　　The prospectus shows that China Satcom is the only satellite communication operator with its own communications satellite resources and autonomous control. At present, it manages 16 high-quality commercial radio broadcasting satellites on the track, and plans to launch 3 high-throughput broadband satellites in the next five years, with a total capacity of not less than 500Gbps.

　　The proposed Zhongxing 18 is a broadband multimedia bidirectional Ka/Ku band communication satellite. After putting into operation, it will further improve the service capability of the "Zhongxing 16" broadband communication satellite launched in April 2017, providing services in the fields of voice, data, image and video processing/transmission, multimedia applications and high data rate Internet applications.

　　It is understood that the construction period of the project is three years, the operation period of the project is 15 years, the total investment is 1.52 billion yuan, and the investment progress is 220 million yuan, 370 million yuan and 920 million yuan within three years of the construction period.

　　In Zhongxing 18 satellite project, Ka multi-beam transponder and Ku-beam transponder are mainly added. There are 30 transponders in Ku band, 9 transponders in Ka band and 2 transponders in Ka BSS band. After the completion of the project, the Ka multi-beam broadband system of Zhongxing 16 satellite and Zhongxing 18 satellite totals about 30 Gbps, which has potential market demand and good digestibility in China. Ku band mainly covers Southeast Asia, the West Indian Ocean and other areas abroad, which can increase the reserve of satellite frequency resources of China Satellite Communications.

　　"Joy and worry coexist" in telecommunication satellite operation

　　At present, the development of telecommunication satellite operation industry presents two kinds of development situations: the high-definition program star is still the main growth power of the industry; the application and promotion of high-throughput satellite will become the breakthrough point of the industry.

　　From the perspective of industry competition, China Satellite has absolute competitive advantage in the domestic market with abundant operation experience and good customer reputation. According to company statistics, its market share reaches 80%. From the perspective of international market, the telecommunication satellite operation industry needs huge capital investment, so there is industrial agglomeration. Data show that by the end of 2016, there are more than 40 major providers of telecommunications and satellite communications in the world. China Satcom ranks sixth in terms of business income and is in the leading position in the industry.

　　Although the telecommunication satellite operation industry is facing the encouragement and support of the national industrial policy, the development of China's aerospace industry has provided the basic guarantee for the satellite communication service industry and the triple advantage of the wide demand of the satellite communication market, but the development of the industry still faces many challenges.

　　On the one hand, China's satellite live broadcasting business has not been fully liberalized and industrialized. On the other hand, the industry is restricted by ITAR, which makes the source of procurement relatively single, and also poses certain obstacles to the global development of China's telecommunication satellite operation industry and overseas M&A investment.

　　With the continuous enrichment of 5G application scenarios, the network will be upgraded to the direction of high speed, low delay and large capacity, which brings huge market demand for optical fiber communications, while increasing the competitive pressure of satellite communications. With the continuous extension of optical fiber network to remote and poor areas, the coverage of optical fiber network has been improved, which will also have an alternative effect on the application of satellite communications.

　　In addition, satellite space resources are becoming increasingly scarce. As far as ITU registration is concerned, C-band satellites in geostationary orbit are nearly saturated and Ku-band satellites are crowded. In recent years, although Ka computing resources still have some space to use, in the long run, with the increasing use of human satellites, satellite space resources are still an important factor restricting the development of satellite industry.

　　Operating income increased slightly and depreciation cost was high.

　　The prospectus shows that during the reporting period, China Weitong achieved business income of 2.39 billion yuan, 2.476 billion yuan and 2.621 billion yuan, respectively. Its business income showed an increasing trend year by year, with net returns of 514 million yuan, 433 million yuan and 389 million yuan respectively, and net profits of non-return of 497 million yuan, 301 million yuan and 388 million yuan respectively.

　　In the prospectus, China Satellite said that the decline in net profit was mainly due to the depreciation of satellite assets, loss of assets impairment, commissioned financial returns and other specific factors. Among them, the depreciation cost of satellite assets accounted for a relatively large proportion. During the reporting period, the depreciation cost was 960 million, 1.07 billion and 1.11 billion, accounting for 78.5%, 76.9% and 80.8% of the main business respectively.

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