In the early telecommunications room, the 220V AC power supply was rectified to charge the 48V battery pack, and the battery pack directly supplied power to the program-controlled switch. With the application of computer networks and communication networks in telecommunications rooms, it is necessary to provide high quality 220V AC power. Since there is an existing 48V battery pack, the battery pack + inverter is usually used to convert 48V DC to 220V AC power to supply power to the network. There are many drawbacks to this approach.
1. The most important function of UPS (uninterruptible power supply system) is uninterrupted power supply. When the city grid meets the input range, it will be double-converted by AC/DC and DC/AC to supply power to the load. When the city grid exceeds the limit, the battery will be The load is powered and supplied to the load by the bypass source when the UPS fails or is overloaded. The UPS can also be maintained online during maintenance by a manual maintenance bypass switch. The power supply mode of the battery pack + inverter, when the battery pack fails to be replaced, the system must be interrupted, which will cause huge losses to the system. The uninterrupted effect of the UPS is that the battery pack + inverter cannot be replaced.
2. The role of UPS is to achieve uninterrupted mutual switching of dual power supplies, providing backup time, voltage regulation, frequency stabilization, and isolation interference for a certain period of time. It can block transient disturbances, harmonic disturbances, voltage fluctuations, frequency fluctuations, surges and other grid disturbances before the load. Since the input DC bus and the external battery pack of the UPS's own inverter do not have any direct electrical connection with the user's original 48V communication power supply, they will not cause any conducted interference to the programmable control machine. In addition, in order to prevent external radiation interference, the UPS usually adopts a steel plate frame structure, while maintaining a beautiful shape, eliminating radiation interference to other devices. An RFI filter is used at its input and output, so that the purified AC power is supplied to the load.
For the 48V battery pack + inverter, since the DC power supply used in the inverter power supply and the program control equipment room is the same battery pack, and the inverter uses the high frequency pulse width modulation working mode, the back noise interference is inevitable. Will be stringed into the input of the program-controlled phone, which will greatly affect the quality of the call.
3. Because the inverter is a fixed 48V power supply, the battery voltage is low. When the output power requirement is large, the higher the production process requirements for the power module, the high power inverter is difficult to implement. Currently, the largest inverter is about 15KVA. The UPS's own battery pack DC voltage can be as high as several hundred volts, so the stand-alone power can be very large.
4. Due to the small amount of power supply of the 48V inverter, the scale of the manufacturer is small, and its strength is difficult to compare with the UPS manufacturer. As a complete and independent power supply system, UPS has been produced in the world for several decades. It has a large production scale, mature technology and high reliability. Its reliability index can reach hundreds of thousands of hours theoretically. The 48V inverter power supply is technically difficult to match.
5. In order to meet the rapid development of modern communication networks, UPS or inverters must have strong network management functions. LEUMS UPS provides users with 2 RS232 interfaces, 1 computer dry contact interface and 1 set of remote alarm relay contacts. Its comprehensive network management software can adapt to different operating systems, and can monitor 16 UPS at the same time, and can monitor up to 170 parameters. Its unique Life 2000 remote monitoring software allows your UPS to be monitored by professional engineers every day, ensuring peace of mind. For 48V inverters, due to the limitations of production scale and scope of use, few manufacturers can provide such strong software functions.
6. Some people have suggested that the shortcoming of UPS is that when the input voltage is high or low, it will turn into battery discharge, and the condition of China's power grid is usually poor, which will cause the battery to discharge frequently and shorten the battery life. This is not a concern when using a 48V inverter. In fact, today's powerful UPS production plants in the world, such as LEUMS, are designed with this in mind. LEUMS UPS, with advanced DSP control technology, has an ultra-wide input voltage range and is fully loaded in the +25% range, greatly reducing battery discharge times. Its advanced intelligent battery management function makes its charger have very small AC ripple, automatic voltage compensation of charging voltage, automatic termination of discharge termination voltage with discharge time, automatic battery detection, battery life calculation and other functions, which greatly protects the battery. Can extend battery life by 30%.
In summary, we believe that the 48V inverter can not reach the level of online UPS in terms of control technology, anti-interference, network management, power level, reliability, etc. Therefore, the online UPS should be selected in the telecom machine room. good.
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