Selection of UPS power supply
UPS power system, as a high-tech product developed to meet the needs of the power market, has obvious power protection functions: when the mains power is cut off, it will continue to supply power to the load; when the mains is unstable, it can prevent the load from suffering Under voltage, surge impact, etc., and comprehensively improve the quality of power supply; when the power supply system (including UPS) fails, the load (especially the computer and network system) can be fully protected, and overload, short circuit, Protection against over-discharge of the battery provides a stable working environment for the load.
As the IT system gradually moves towards centralized management, the application of UPS power protection systems by enterprises will become more in-depth. The application of UPS will show a trend from a single machine to a redundant structure, from focusing on system reliability to focusing on system availability, and from a pure power supply system to ensuring changes in the entire IT operating environment. With the development of information technology, electronic technology, and control technology, various advanced technologies have been widely used in the design, development and production process of UPS. The following six major development trends will appear in UPS technology.
Through the analysis and synthesis of various information, the intelligent system should not only complete the control function of the normal operation of the corresponding part of the UPS, but also complete the real-time monitoring of the running UPS, and analyze and process the important data information in the circuit. Find out whether each part of the circuit is working properly and other functions; when the UPS fails, it can analyze in time according to the test results, diagnose the fault location, and give the treatment method; take necessary emergency protection and control actions in time according to the needs of the scene to The expansion of the impact of failure prevention; complete the necessary self-maintenance, have the function of exchanging information, and can input information to the computer or obtain information from the networked machine at any time.
Digital UPS adopts the latest digital signal controller (DSP) to digitize Hall sensor devices, which realizes 100% digital operation of the UPS system. A multiple microprocessor redundancy system is also adopted, and multiple microprocessors with independent power supplies are used to control the rectifier, inverter and internal static bypass, thus improving the digitalization and reliability of the system.
The power switch of the first generation of high frequency UPS is a thyristor, the second generation is a high-power transistor or field effect tube, and the third generation is an IGBT (insulated gate bipolar transistor). The switching speed of high-power transistors or FETs is an order of magnitude higher than that of thyristors, and the current capacity and speed of IGBT power devices are much larger and faster than those of high-power transistors or FETs, which makes the operating frequency of the power conversion circuit Up to 50kHz. The increase in the frequency of the conversion circuit has greatly reduced the inductance, capacitance, noise and volume used for filtering, and greatly improved the UPS efficiency, dynamic response characteristics and control accuracy.
Redundant Parallel Technology Through the development of new application technologies, the redundant parallel operation of multiple modules in the UPS can be realized, without additional central control components, and the load is evenly distributed. When a certain module fails, the load is automatically transferred and repaired It can be hot-swappable, greatly improving the power supply reliability of a single UPS. Coupled with the redundant operation of the system composed of multiple UPSs, if a single UPS fails, it will be shut down immediately, and the other UPS systems will automatically assume the full load without any impact on the load.
Integration With the development of information technology, the application field of power protection continues to expand and requirements continue to increase. It is difficult for UPS to meet these requirements alone. It must control the links involved in the entire power system. UPS starts from the initial equipment protection and system. The protection of pure backup power technology has developed to today’s integrated application of information protection, intelligent management and overall computer room integration, and its connotation has been extended to power generation, power distribution, transformation, uninterrupted power supply, computer room, power equipment, power cables, data wiring, Environmental monitoring and system management are no longer UPS in the original sense. UPS equipment is just the core component of the system.
From the perspective of UPS power technology, based on the continuous optimization of power output characteristics, the research on power input characteristics makes electromagnetic compatibility and low harmonic pollution important indicators. Harmonic processing technology and electromagnetic compatibility design can improve the power supply The load characteristics of the power grid reduce the burden on other equipment and improve the source effect of the power supply. The concept of green power has begun to be paid attention to. The development of electronic technology and computer technology, in addition to greatly improving the power performance of UPS, its network management can realize remote monitoring, digital power control technology enables products with customized functions, and intelligent design makes it highly intelligent Monitorable, controllable and adaptive equipment.
