Now the public supply system all over the world is AC power, an ideal AC power supply, should meet the following conditions:1. frequency stability2. voltage stability (soil 5%)3. does not contain harmonic distortion (<5%)4., no noise interference (comply with IEEE 587, FCC, CE and other standards)5. low output impedance.
The so-called uninterruptible power system, is able to replace electric power supply continued when there is a power device, its power from the battery, electronic components due to the reaction speed, power moment in 4~8 milliseconds or no time to supply power in the middle.
UPS has evolved from the 60s rotary generator to today's intelligent, fully static electronic circuit and continues to develop. At present, UPS generally refers to the static UPS, classified according to its way of work, can be divided into backup, online interactive and online three categories.1. backup type UPS: when the city power is normal, the power supply is directly supplied by the city to the load. When the power supply exceeds the scope of work or the power failure, the power supply is transformed into a battery by inverting the switch. The utility model is characterized in that the structure is simple, the volume is small, and the cost is low, but the input voltage range is narrow, the output voltage is stable, the precision is poor, and the switching time is also available, and the output waveform is generally Fang Bo2. line interactive UPS: in the normal electricity directly by electric power to the load when the power is low or high, through the UPS internal voltage regulator circuit voltage output, when power failure or abnormal, through the switch to battery powered inverter. Its characteristics are: wide input voltage range, low noise, small size and so on, but there is also switching time3. online UPS when power supply is normal, the rectifier provides DC voltage to the inverter by electricity from the inverter to provide AC power load, power anomaly in the city when the inverter powered by battery, the inverter always in working condition, ensure uninterrupted output. The utility model is characterized in that the utility model has the advantages of extremely wide input voltage range, no switching time, stable output voltage and high precision, and is especially suitable for occasions with high power supply requirements, but the cost is higher. At present, UPS with power greater than 3KVA is almost all online UPS
You can imagine today, if not used uninterruptible power supply systems, so when the power is abnormal, will cause the computer to crash, or even cause a hardware failure, and maintenance costs will not be expected; hardware failure can huaqianxiaozai, but in the hard drive data? But the money can not buy, so for your device to buy UPS, like buying insurance, UPS system is not only prepared against want; only when there is a power failure action, city electric anomalies mentioned above, including the voltage too low or too high, surge, noise, power quality is sufficient to affect the normal operation of the equipment, so the importance of UPS remarkable.UPS as an important peripheral equipment of computer, in the protection of computer data and guarantee the grid voltage and frequency stability, improve power quality, prevent accidents and instantaneous power interruption on user harm is very important.
Intelligent UPS is a major trend in today's UPS, with the application of UPS in network system, network management emphasizes the whole network system as the object of protection, hope that the whole network system in the power supply system failure, can still continue to work without interruption. Therefore, the intelligent UPS microprocessor to the internal configuration is the new trend of UPS, combined with UPS internal hardware and software, greatly improve the function of UPS, working status, such as: UPS UPS can monitor the frequency of output voltage, voltage frequency, battery status and fault record etc.. Software can also be used to detect the battery, automatic discharge, charging, and remote control switch machine, etc.. The network administrator can analyze the power supply quality according to the information, and take corresponding measures according to the actual situation. When the UPS detects the interruption of the power grid, the UPS automatically switches to the battery and immediately notifies the server of the shutdown when the battery is low, and shuts down the battery before it runs out of power. Intelligent UPS communicates with the computer through the interface, so that network administrators can monitor UPS, so the function of its management software is extremely important.
