UPS uninterruptible power supply is an important equipment to protect power supply.At present, UPS power supply is widely used in emergency lighting system, railway, shipping, transportation, power plant, substation, nuclear power plant, fire safety alarm system, wireless communication system and other fields.
UPS refers to uninterruptible power supply, which is a system device that connects the battery with the host computer and converts direct current into urban power through the inverter and other module circuits of the host computer.Mainly used for single computer, computer network system or other power electronic equipment such as solenoid valve, pressure transmitter to provide stable, uninterrupted power supply.
When the mains input is normal, UPS will supply the mains voltage stabilizer to the load for use. At this time, UPS is an ac voltage regulator, which also charges the battery inside the machine. When the mains power is interrupted, UPS will immediately supply 220V ac power to the load through the method of inverter switching, so as to maintain the normal work of the load and protect the software and hardware of the load from damage. UPS devices usually provide protection against either high or low voltages. UPS uninterruptible power supply equipment refers to the power supply equipment that can always supply high-quality power and effectively protect precision instruments without interruption due to short power failure. UPS power system consists of five parts: main circuit, bypass, battery and other power input circuit, AC/DC conversion rectifier (REC), DC/AC conversion inverter (INV), inverter and bypass output switching circuit, and energy storage battery.
The difference between UPS and EPS:
1.the two apply to different objects. EPS power supply is mainly to deal with sudden power grid failure, can immediately provide escape lighting and fire emergency, to ensure power protection and fire linkage, to protect the safety of users' lives, products need to be through the fire certification supervision of the ministry of public security, and accept the acceptance of installation site fire control. UPS power supply is only used to protect the user's equipment or business from economic losses, products need to be certified by the ministry of information industry.
2. they have different power supply options. UPS is inverter priority to ensure power supply, EPS is power priority to ensure energy saving. Of course, there are differences in the design indexes of rectifier/charger and inverter.
3. EPS adopts offline power supply, which is the last power supply guarantee. When the mains power failure, if EPS can not through the battery emergency power supply, just like a virtual general, the consequences will be unimaginable. UPS, on the other hand, USES an online system. Even if there is a fault, it can give an alarm in time. In addition, there is a backup power supply, so that users can timely master the fault and eliminate it, which will not cause greater losses to the accident.
4. the technical design indicators of each component of the two are allocated differently. EPS is mainly used to provide power supply for power supply and fire protection safety. The load properties are both inductive, capacitive and rectifying nonlinear loads, and some loads are put into work after the power is cut off. Therefore, EPS is required to provide a large impact current, good output dynamic characteristics and stronger anti-overload capacity. UPS is mainly to provide power to computers and network equipment, load nature (input power factor) is not very different.
5.the price is different. UPS has high output accuracy, fast conversion time, high cost (about twice of EPS), high energy consumption (online), and short host life (8-10 years).
UPS is an uninterruptible power supply used primarily to provide power protection for important loads, including the elimination of various electrical disturbances in the grid. EPS is an emergency power supply, which mainly provides certain power supply time to the load after the power failure of the municipal power supply. Therefore, it has a discontinuity from the power failure of the municipal power supply to the resumption of output.