Power supply is short for uninterruptible power supply, and its main function is to provide a stable and uninterruptible power supply for computers or some electronic devices by connecting the battery to the host. EPS power supply is the abbreviation of emergency power supply, usually used in emergency and accident lighting. Many people think that UPS power supply and EPS power supply and there is no difference, in the use of time can also be interchangeable, but in fact, these two power supplies are there are some differences.

Difference in output
The power supply object of UPS is computer and network equipment. The nature of the load is not much difference, so the national standard UPS output power factor of 0.8, while the EPS is mainly used as a power emergency protection, the nature of the load for the inductive, capacitive and rectifier loads both. Some loads are put into operation after the utility power failure. Thus, the EPS is required to provide a large inrush current, generally require 120% of the rated load can still operate normally for more than 10rain, so the EPS needs to be a good output dynamic characteristics, overload resistance should be strong. UPs rated capacity to the apparent power (kv-A) as a unit, the EPS rated capacity to the active power (kW) as a unit. On-line UPS to ensure uninterrupted output power supply and quality power supply, the choice of inverter priority. And EPS power supply to ensure emergency use, is to choose the utility power priority.

Functional differences
Both have utility bypass and inverter circuit, but the EPS only has a continuous power supply function, the general switching time requirements for the inverter is not high, there can be multiple outputs, some EPS is also configured with a single battery monitoring function. eps in the utility power supply bypass when normal. In the utility power interruption only when the inverter power supply, high power utilization, while the UPS generally emphasize its three major functions: voltage and frequency stabilization; switching time requirements * high not to ask the power supply; purify the utility; in the day-to-day focus on the rectifier, inverter double conversion circuit power supply, inverter failure or overload only when the bypass power supply, the power utilization is not high.UPS does not only play a role in the utility power interruption. When the utility voltage is too low, too high, line surge and other abnormalities, UPS can output high-quality power to ensure the normal operation of power equipment.

Differences in application areas
In China, EPS is mainly used for fire-fighting loads and some of the power supply quality requirements are not too high, but need to ensure that the continuous power supply of power equipment, emphasizing only the function of continuous power supply. Only emphasize the function of continuous power supply, EPS is used for fire load, its product technology by the Ministry of Public Security fire certification, UPS is generally used for computers and digital information systems and other occasions. Requirements for higher quality of power supply loads, mainly emphasizing the inverter switching time, output voltage, frequency stability, the purity of the output waveform, no interference of all kinds.