There is a common misconception that the utility power we use, except for occasional power outages, is continuous and constant, but it is not. As a public power grid, the mains system is connected to thousands of various loads. Some of the larger inductive, capacitive, switching power supplies and other loads not only obtain power from the power grid, but also cause damage to the power grid itself. Affect and deteriorate the power supply quality of the power grid or local power grid, resulting in the distortion of the mains voltage waveform or frequency drift. In addition, unexpected natural and man-made accidents, such as earthquake, lightning strike, open circuit or short circuit of power transmission and transformation system, will endanger the normal supply of electricity, thus affecting the normal operation of the load. According to the tests of electric power experts, the problems that often occur in the power grid and cause interference or damage to computers and precision instruments mainly include the following:

1. Power surges: Refers to the RMS value of the output voltage being 110% higher than the rated value, and Duration of one or more cycles. Surge is mainly due to the high voltage generated by the sudden unloading of the grid when large electrical equipment connected to the grid is shut down.

2. High voltage spikes: refers to the voltage with a peak value of 6000V and a duration from 1/10,000th of a second to 1/2 cycle (10ms). This is mainly due to lightning strikes, arcing, static discharges or switching operations of large electrical equipment.

3. Switching transients: refers to the pulse voltage with a peak voltage of up to 20000V, but the duration is between one millionth of a second to one ten thousandth of a second. The main causes and possible damage are similar to high-voltage spikes, but the solution is different.

4. Voltage sag (power sags): refers to the low-voltage state in which the effective value of the mains voltage is between 80% and 85% of the rated value, and the duration is one to several cycles. This problem can be caused by the start-up of large equipment, the start-up of large electric motors, or the connection of large power transformers.

5. Electrical line noise: refers to radio frequency interference (RFI), electromagnetic interference (EFI) and various other high-frequency interferences. The operation of the motor, the action of the relay, the operation of the motor controller, the broadcast emission, the microwave radiation, and the electrical storm, etc., will cause line noise interference.

6. Frequency variation (frequency variation): refers to the variation of the mains frequency exceeding 3HZ. This is mainly caused by the unstable operation of the emergency generator or by the power supply with unstable frequency.

7. Continuous low voltage (brownout): refers to the effective value of the mains voltage is lower than the rated value and lasts for a long time. The causes include: large equipment startup and application, main power line switching, starting large electric motors, line overload.

For computers, normal power supply is required for the display and host to work, especially the memory, which has higher power requirements. It is an electrical energy-dependent storage device that requires constant refresh action to keep the stored content. Once the power is turned off, the saved content disappears immediately. If the power is turned off abnormally, the information in the memory will not be saved to storage devices such as hard disks in time, which will cause the information to lose its value due to complete loss or incompleteness, thus wasting a lot of work energy, time, and even causing huge economic losses. For an operating system such as UNIX, if the system is not shut down normally, the system information in the memory is not written back to the hard disk, which may also cause the system to crash and fail to start again. In addition, although the hard disk in the computer uses a magnetic storage medium, information will not be lost due to power failure, but a sudden power failure will damage the physical head of the hard disk that is reading and writing, or the system files will be in the process of maintaining the file system. , resulting in an error in the file allocation table, resulting in the scrapping of the entire hard disk.

In addition, most of the current operating systems can set virtual memory. Due to a sudden power failure, the system cannot cancel the virtual memory in time, resulting in "information fragmentation" in the hard disk, which not only wastes the storage space of the hard disk, but also causes the machine to run slowly. The computer power supply is a rectifier power supply. Excessive voltage may cause the rectifier to burn out. The voltage spikes, transient overvoltage, and power noises may enter the motherboard through the rectifier, affecting the normal operation of the machine, or even burning the host circuit. In conclusion, power problems are a major threat to computer work. But with the increasing importance and wide range of computer and network applications, safe and reliable power supply has become an important issue that network design and management personnel have to face seriously. "Need is the first driving force for social development", in this context, UPS (Uninterruptible Power Supply) came into being, and with the development of power electronic technology, it has been constantly innovating. Industry, and with the passage of time, there will be vigorous development and bright prospects.

At present, only a few areas in my country have just solved the problem of power shortage. Most areas and big cities are still facing the urgent problem of power supply shortage, and the quality of power supply cannot be guaranteed. But even in the already electrified US and other Western countries, the quality of the grid is far from reliable. Due to the quality problems of the power grid itself and the effects of various accidental factors, power grid problems such as voltage surges, electromagnetic noise, and continuous high voltage are common in developed countries, and even short-term power outages may occur. The bad factors from the power grid include: instantaneous or long-term sag, surge and interruption of the power supply voltage, drift and instability of the power supply frequency, distortion of the power input waveform, various peak interference and noise, etc. All this is very serious for sensitive instruments with high precision and equipment that cannot be interrupted. For example, when the computer is powered off or has a relatively large voltage drop, it may cause the information on the memory to be flushed and the hard disk data to be lost. In a hospital, if electronic medical equipment stops working because of a power outage, the impact on patients can be fatal. In fact, among the various factors that cause data loss, power failure ranks first with a probability of 45.3%, the other major factors are: storm 9.4%, fire 8.2%, hardware and software failure 8.2%, flood 6.7%, and earthquake 5.5%.

Therefore, EVEREXCEED can recommend various UPS solutions of our company to customers. The specific UPS working methods include online, offline and interactive; categories are: modular, tower, rack, outdoor; types: high-frequency machine, power frequency machine, integration and other systems; it can also be customized and designed according to the specific requirements of customers; all superior solutions can be solved for customers. If you have any requirements or any kind of query regarding the UPS solutions, feel free to communicate with our dedicated team at any time at marketing@everexceed.com.