Domestic communication power of technology and market 

 With the rapid development of telecommunications technology, telecommunications, network structure become more complex, part of the communication system of the heart - the importance of communication power supply system is increasingly reflected power as a communication system. In recent years, domestic communications network and communication services handling the dredge directly related to switching, transmission and mobile, satellite, data communications equipment, technology has developed rapidly, the majority has been reached or close to the world advanced level. But the technology of communication power supply equipment is relatively backward. 

 Nationally, the 1970s, the technical level of phased power certain percentage, technologically advanced power supply is relatively small, especially in economically backward areas. Traditional communication power in terms of technical performance indicators for power supply from the power devices are far from meeting the technical requirements of not changing telecommunications network. The level of technology is not only lack of coordination, communication power supply equipment and the various types of communications equipment and the technology gap continues to expand, this is very unfavorable to the coordinated development of future communication networks. 

 Starting to improve reliability, expansion capabilities, distributed power supply system should be used to gradually replace the centralized power supply. In order to meet the communication network of technology requirements, but also suitable for use in distributed power supply, we should vigorously promote the high frequency switching rectifiers, power supplies, to replace the traditional SCR phase-controlled power. This alternative to the ordinary lead-acid batteries with VRLA batteries centralized computer monitoring system instead of analog control system with three technology hot spot of China's development of communication power supply equipment. 

 Switching power supply technology development 

 The technical development of the domestic switching power supply, basically due to the late 1970s and early 1980s, mainly through the introduction of a number of universities and research institutes abroad, switching power supply technology, the vast majority still remain in the teaching and testing phase. Switching power supply and phase-controlled power, has a very significant advantage of the mid-1980s, the sea of ??scientific researchers and the technology is more sensitive to small power supply manufacturers, began to explore the nature of the switching power supply production, sales and marketing This is the initiation stage of the switching power supply market. At that time, mainly in the stage of learning and imitation of foreign technology, circuit model, product technology and product reliability are still immature. 
 Due to the huge profits of China's telecommunications industry, a huge market capacity and switching power supply, the switching power supply in the country was Liaoyuanzhishi quickly become the ideal product to replace the phased power, product technology is gradually becoming more mature. The circuit pattern by the hard switching of the early analog control to the soft switch, the digital control mode conversion. And active power factor correction technology, rectifier current sharing technology and computer monitor networking technology has also been widely used. The appearance of the product process also gradually move closer to the mature foreign power products. At present, the internal switching power supply and foreign advanced power products compared, in the technical aspects have been comparable, even in the AC input range, advanced circuit mode applications, monitoring, networking flexibility even better than their foreign counterparts. Should be noted, however, the stability and reliability of the foreign power products are still better than we can, which users are most concerned about technical indicators. 
 Regulator (http://www.pandeng.org.cn)