How uninterruptible power supply works

Due to the development of information technology, the network has become an indispensable part of people’s lives and work. The power supply reliability of the digital computer room that constitutes the network has become the key, and the reliable power supply of the computer room is the top priority, usually uninterrupted. The power supply is used to maintain the uninterrupted operation of key commercial equipment or precision instruments such as computers (especially servers) or switches, to prevent computer data loss, telephone communication network interruption or loss of control of the instrument. Today we will look at the uninterruptible power supply. Related content introduction.

What is an uninterruptible power supply

An uninterruptible power supply is a device that continuously provides backup AC power to electrical load equipment and maintains the normal operation of electrical appliances in the event of abnormal power grids (such as power failure, undervoltage, interference or surge "also known as inrush current").

Uninterruptible power supply characteristics：

1.Green, energy-saving, and environmental protection: In the context of intensified changes in the world's energy structure, violent fluctuations in international oil prices, and tight global energy supply, energy conservation and environmental protection have become the guiding principles for UPS manufacturers to innovate their products. For UPS, the level of input power factor indicates its ability to absorb active power from the grid and the degree of influence on the grid. Reducing the input harmonics of the power supply can not only improve the load characteristics of the UPS on the power grid, reduce 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 can minimize the consumption of reactive power.

2. High frequency: Compared with traditional power frequency UPS, high frequency UPS adopts power factor correction and high frequency soft switching technology, eliminating the need for power frequency power conversion, so it has higher operating efficiency, harmonic pollution to the grid and The reactive power consumption is extremely small, and it can fully meet the standard requirements of the relevant power industry at home and abroad. In addition, high-frequency power conversion devices have significant effects in reducing the volume and weight of magnetic components, reducing manufacturing costs, curbing operating noise, energy saving and environmental protection, and are therefore more and more recognized by users.

3. High-power and modularization: Due to the rapid development of the IT industry, the amount of data in the data center continues to grow at an explosive rate, and power consumption increases with it. On the one hand, UPS is developing in the direction of greater power, and on the other hand, in response to the need for phased expansion of uninterruptible power supply capacity, product modularity has become an unstoppable trend. More personalized user needs, larger data center scale, and higher maintenance costs make UPS no longer a simple uninterrupted power supply equipment, and a complete set of power supply and management solutions for different industries will be favored by the market.

Working principle of uninterruptible power supply

When the mains power is normal at 380Vac, the DC main circuit has a DC voltage, which supplies the DC-AC AC inverter to output a stable 220V or 380Vac AC voltage. At the same time, the battery is charged after the mains is rectified. When the mains is undervoltage or Sudden power failure, the battery pack feeds electrical energy to the DC loop through the isolation diode switch, and there is no switching time from the grid to the battery. When the battery energy is about to run out, the uninterruptible power supply will send out an audible and visual alarm, and stop the inverter at the lower limit of battery discharge, and a long alarm will sound.

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 severe overload occurs (more than 200% of the rated load), the uninterruptible power supply immediately stops the inverter output and jumps to the bypass state. At this time, the front input air switch may also trip. After eliminating the fault, just close the switch and restart the machine to resume work.