博文

目前显示的是 十一月, 2017的博文

Demand of telecom network for outdoor integrated power supply

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In the increasingly fierce competition in the telecom industry nowadays, the telecom operators pay more attention to the rapid development of the business and the quality of the entire network. As the heart of the whole network, the network energy system is an important part. Operators need to have good cost performance, adapt to different situations, reliable and stable  telecom power supply solution , so as to effectively solve the bottleneck of large-scale telecom construction and development, implement national energy conservation and emission reduction policies, and realize the high availability of the network. Under such circumstances, the establishment of a complete “network, energy integration” of the telecom power supply room, is the general trend. Requirements of telecom network construction for power system *The rapid construction, modular design; *Stable and reliable; *Green energy conservation, in line with the national energy saving policy; *Coverage in all direc...

Principle and function of inductors

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Inductors are generally composed of skeleton, winding, magnetic core, shield, package material, etc.. Skeleton generally refers to the bracket of winding coil. The enameled wire is wrapped around the skeleton, and then the core, copper core, iron core and so on are loaded into the cavity of the skeleton to increase its inductance. Winding refers to a set of coils with prescribed functions, and the windings are divided into single layer and multi layer. The core materials are silicon steel sheet, permalloy, ferrite, amorphous, metal powder core and so on. In a  solar inverter , there are usually 4 kinds of inductors, including DC common mode inductance, boost inductor, filter inductor, and AC common mode inductor. The common mode inductance mainly plays the role of EMI filter. On the one hand, it should filter the interference of external common mode electromagnetic to the inverter, on the other hand, restrain the electromagnetic interference of the inverter itself, so as to avoi...

Advantage of distributed solar power generation

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Solar power system  is a power generation system which uses solar cells to convert solar energy into electrical energy directly. Its main components are solar cells, batteries,  solar MPPT charge controllers , and  solar inverters . Solar power generation process is simple, no mechanical rotating parts, do not consume fuel, do not emit any substance including greenhouse gas, no noise, no pollution; Solar energy resources are widely distributed and inexhaustible. Therefore, compared with wind power, biomass power generation nuclear power generation and other new technology, solar power is a most ideal feature with the sustainable development of renewable energy power generation technology. Installing distributed photovoltaic power stations to provide for the parents can reduce the economic pressure and contribute to environmental protection. For local governments, the promotion of distributed photovoltaic power generation in line with national development of new ene...

What is an outdoor integrated base station power supply

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The traditional typical mobile base station is basically built outside, and the power supply of the base station is placed side by side with the cabinet type main equipment such as BTS, cabinet type BBU, transmission and so on. The cabinet height is consistent with the main equipment, basically 1.6m high; The upper part of power cabinet is DC power distribution and outlet part, the lower part is AC incoming line and lightning protection power distribution part, and the middle part is rectifier module and monitoring module; There is no room in the cabinet for battery and other equipment. With the development of the network, the outdoor integrated base station power supply develops rapidly. The outdoor UPS has obvious changes in the cabinet structure, divided into two storages, the upper is the power storage, the rest 2/3 is the battery storage. The original AC, lightning protection power distribution part, the rectifier module and the monitoring module in the middle of the cabinet ar...

The current situation of the development of Chinese solar inverter industry

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Solar inverter  is one of the power supply, and its production process and the required components is quite same to UPS, communication power supply and so on,  China solar inverter  industry is still in the early stages of development, but the develop rapidly. According to statistics, Chinese solar inverter shipments reached 22.8GW in 2016. In 2016, The market of distributed inverters has become hot, inverter oligarchs also began to enter the distributed inverter market, launched a lot of small inverters. In 2016, centralized inverter market accounted for 62%, string inverter market accounted for 32%, the next string inverter, the proportion will continue to increase, to 2020 string inverter market share or to 45%. As the industry is in the early stage of development, its competition pattern is not stable, there are many domestic  solar inverter manufacturers , but the scale is generally small. However, in the domestic solar inverter market, Chinese manufacturer...

Complementarity of wind energy and solar energy resources

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Solar energy is the source of all the energy on the earth, and the sun shines on every part of the earth. Wind energy is another form of solar energy on the surface of the earth. Due to different forms of the earth’s surface (such as sand, ground, vegetation, ground and water), the absorption coefficient of solar radiation is different, resulting in the formation of temperature difference on the ground surface, and then the formation of air convection wind energy. Therefore, wind energy and solar energy have strong complementarities both in time and in seasons: During the day, the sun shines well, the wind is small, at night there is no light, the wind is stronger; In summer, the intensity of the sunlight is large and the wind is small, and the sunlight intensity is weak and windy in winter. The wind energy and solar energy resources in Inner Mongolia also have such complementary characteristics. The wind energy and solar energy resources in a certain place in Inner Mongolia are use...

Principle and application of 48V DC power supply

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48V DC power supply  is a kind of electronic equipment which transforms the low frequency power grid into a special form of high voltage power supply. The  48VDC power supply  can be divided into positive polarity and negative polarity according to the polarity of output voltage. 48V DC power supply has been widely used in various industries, can also be used in the field of agriculture, such as electrostatic dust, electrostatic spraying, electrostatic spraying agricultural material wrapped in agricultural products processing, agricultural and biological effect of electrostatic flocking research, electrostatic sterilization, electrostatic agricultural seed processing and so on. With the development of agricultural science and technology, agricultural scientific research and agricultural engineering application of high voltage electrostatic power demand is increasing year by year, have put forward many new requirements for the accuracy, performance, specifications, va...

UPS with silicon carbide is more energy saving and high efficiency

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The economic mode of  UPS  has great advantages, but the latest development of silicon carbide technology could offset the economic advantages of the mode, the transistor is the traditional silicon controlled device for UPS, insulated gate bipolar transistor (IGBT) function more and more powerful and reliable. The UPS with IGBT device has an obvious disadvantage, the faster the switching speed is (to obtain higher accuracy), the higher the power loss. This is mainly because the upper limit of the module efficiency is 96.8%, and the efficiency of the dual conversion UPS can be increased to 98%~99% theoretically by using SiC devices. The synthesis of silicon carbide powder has been mass production since 1893, the initial cost of manufacturing IGBT by using silicon carbide is very high, but the energy-saving effect is very significant, and all these are not the key to the power grid load transfer, will not increase the risk of power conversion. At the module level, silicon...