Features of uninterruptible power supply, working principle of uninterruptible power supply

2018-02-23


What is Uninterruptible Power Supply
Uninterruptible power supply is an equipment that provides backup AC power supply for electrical load equipment and maintains the normal operation of electrical appliances under the condition of abnormal power grid (such as power failure, undervoltage, interference or surge "also known as surge current").
 
Uninterruptible power supply features
1. Green, energy saving and environmental protection: under the situation of intensified changes in the world energy pattern, severe fluctuations in international oil prices and tight global energy supply, energy conservation and environmental protection have become the guiding principles for UPS manufacturers to carry out product technology innovation. For UPS, the input power factor indicates its ability to absorb active power from the grid and the extent of its impact on the grid. Reducing the input harmonics of the power supply can not only improve the load characteristics of UPS to the power grid, reduce the serious pollution to the power grid, but also reduce the harmonic interference to other network equipment. Many UPS manufacturers have introduced products with a power factor close to 1, which minimizes reactive power consumption.
2. High frequency: Compared with traditional power frequency UPS, high frequency UPS adopts power factor correction and high frequency soft switching technology, eliminating the power frequency power conversion link, so the operation efficiency is higher, the harmonic pollution and reactive power consumption of the power grid are extremely small, and can fully meet the standard requirements of relevant power industries at home and abroad. In addition, the high-frequency electric energy conversion device has significant effects in reducing the volume and weight of magnetic components, reducing manufacturing costs, suppressing operating noise, energy saving and environmental protection, and is therefore increasingly recognized by users.
3, high-power, modular: Due to the rapid development of the IT industry, the amount of data in the data center is also growing at an explosive rate, followed by increased power consumption. On the one hand, UPS is developing in the direction of higher power. On the other hand, in order to cope with the demand of phased expansion of uninterruptible power supply capacity, product modularization has become an irresistible trend. More personalized user needs, larger data center scale and higher maintenance costs make UPS no longer a simple uninterruptible power supply equipment, and a full set of power supply and management solutions for different industries will be favored by the market.
 
Uninterruptible power supply working principle
When the mains supply is normal at 380Vac, the DC main circuit has a DC voltage, which is supplied to the DC-AC AC inverter to output a stable 220V or 380Vac AC voltage. At the same time, the mains supply charges the battery after rectification. When the mains supply is undervoltage or suddenly loses power at any time, the battery pack feeds electric energy to the DC circuit through the isolation diode switch, and there is no switching time from power supply to battery supply. When the battery energy is about to run out, the uninterruptible power supply will give an audible and visual alarm, and stop the inverter at the lower limit of battery discharge, and give an alarm for a long time.
The uninterruptible power supply also has an overload protection function. When an overload (150% load) occurs, it jumps to the bypass state and automatically returns when the load is normal. When a serious overload occurs (more than 200% of the rated load), the UPS immediately stops the inverter output and jumps to the bypass state, at which time the front input air switch may also trip. After eliminating the fault, just close the switch and restart the machine to resume work.