Uninterruptiable Power Supply,60 years by the rotation of the 20th century to the current generator has a certain degree of static intelligent all-electronic circuit, it is technology, especially with the electronic power devices and automatic control technology and the rapid development of increasingly sophisticated......
Kermao UPS Winning has surgery Kermao.cn 2011-3-3 16:49:24
In modern communication systems, with the intelligent network, data networks, network management and monitoring systems, billing systems and customer services business accounts of large-scale construction and development of the system, as servers, workstations, widely used computer equipment. In order to ensure that the program is running, data storage and other hardware devices running the security, stability, must be equipped with high-quality AC uninterruptible power supply system.
Currently, telecommunications operators in the basic communication network, there are two uninterruptible power supply solutions, one is owned communications infrastructure, power supply DC48V battery + inverter, the other is the use of on-line UPS (uninterruptible power supply) . From equipment operation, maintenance point of view, the difference is with the development of network technology has become increasingly evident, the following aspects briefly from the comparative analysis.
Power Supply
On-line UPS the power supply sub-four cases, when the city power grid match the input range, after AC / DC (rectification), the battery charging, while AC / DC power to the load; when the on-line UPS failure or overload automatically Static bypass switch mains power to the load; maintenance, maintenance bypass switch by manual adjustment, uninterrupted power to the load to the mains, which will load UPS with isolation for maintenance.
Battery pack + power supply inverter only two, the general practice is to use the power inverter based on DC 48V output for the load, the utility as a backup.
Visible, on-line UPS power supply inverter + battery pack than a more secure, more reliable, and can better address the utility exception, their own fault, overload and other problems caused by power supply.
Quality of power supply
The role of two kinds of power supply system is to achieve mutual standby uninterruptible power supply switch, provided by the battery backup time to ensure that foreign repair, but the system safety and reliability of electricity supply quality, isolation, two very different interference .
First, the security and reliability. Transient surge in anti-respect, on-line UPS configuration lightning input function modules that can withstand the transient surge 4KV/2KA level impact; and battery pack + front-end switching inverter system is also fitted with lightning protection rectifier Component, so both are very good protection. However, the current IGBT inverter modules power amplifier tube used in the compressive strength of 600 volts, normal operation of the IGBT inverter part in the UPS power amplifier tube at high voltage (240 volts or more), while the small current working condition, 48 V reverse Change the DC input voltage of only about 53.5 volts, so the same load, the output will be greater in the same operating current, which for the equipment components have a direct impact. Shows the running-line UPS inverter reliability higher than 48 volts.
Second, isolation interference. 48 volt inverter and the program-controlled switchboard room used by a DC bus, DC power supply shared bus, and to the same group as the 48 volt battery backup power supply, 48 volt inverter is the high frequency pulse width modulation (20-40KHz ) work, the larger the load will be formed in a variety of difficult to deal with the noise interference, which greatly affect the program-controlled switches, voice quality, increased data communication error rate. On the contrary, for the on-line UPS to side, because of its inverter input dc bus and an external battery pack are the original 48-volt and users do not have any direct communication power electrical connections, so it will not have any PBX conducted interference, Nature does not exist "anti-irrigation noise" interference, to improve the communication quality is very favorable.
In addition, UPS is to prevent the interference of external radiation, usually steel-frame structure, eliminating the interference of radiation other equipment.
Power supply capability
Battery + 48V inverter is a fixed supply, the battery voltage is low, the greater the output power requirements when the production process of the power module requirements of the higher, therefore, difficult to achieve high power inverter. The on-line UPS battery pack itself comes with a high DC voltage, so power can be great stand-alone, and the machine can also be flexible and to further expand capacity and increase the power factor of safety.
Management capacity can be
Modern communication networks can be adapted to the needs of rapid development, requiring power must have a strong support to management. On-line monitoring unit configured UPS and software that can fairly easily WindowsNT, Windows2000, Novell, Unix and other operating systems, the implementation of powerful power detection and management. And through protocol analysis, dynamic environment can be incorporated into UPS Monitoring System platform. UPS operating parameters in real-time telemetry, remote analysis of running "Events", remote off load the system to achieve real-time unattended, but are in the monitoring of professional engineers. In contrast, 48-volt power inverter is a small sampling monitoring unit to record less information, manageability can not be compared with the on-line UPS.
Efficiency
Battery + inverter, will be 220 volts / 380 volts AC into 48 volt rectifier equipment is generally about 90% efficiency, inverter inverter efficiency of 80%, so in this way can only use 70 % of the effective battery, bringing the system heat capacity, increase the cooling fan power and operating costs big. In contrast, the efficiency of the power-line UPS can reach over 90%. In addition, through the use of advanced DSP control technology, online UPS has a wide input voltage range, greatly reducing the battery discharge, in the advanced intelligent battery management features that make automatic temperature compensated charging voltage, charging time and end with the discharge automatically adjust the voltage, on-line battery testing, battery life calculation, to protect the battery, battery life can make more than 30%, the effective maintenance cost savings.
Conclusion
From the above analysis of two different power supply system can be seen on-line UPS power and the traditional 48-volt power inverter in comparison with high reliability and low cost clear advantage. Thus, with the data network, support network development, data exchange of electrical equipment increasing, and increasing the capacity, if required by the exchange with medium and large capacity uninterruptible power supply equipment, the best selection of on-line UPS.
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