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What is UPS? Features of offline UPS. Offline UPS is actually what we usually call UPS backup power supply. The offline power supply topology is the simplest kind of UPS structure. Under normal working conditions, the AC main power pen will pass through the UPS until the critical load is reached.
What is UPS backup power supply?
UPS backup power supply refers to the general power supply, it is small in size, mostly used for temporary power supply, household electricity, personal computer host, etc. The frequency and voltage are relatively stable, and the power requirement is relatively low. Occasions.
The UPS backup power supply is usually in the battery charging state, but in the event of a power failure, the inverter will switch to the working state urgently to convert the DC power provided by the battery into a stable AC output. Therefore, the standby UPS is also called an offline UPS.
This kind of UPS has problems with switching time, so it is not suitable for use in places where the critical power supply cannot be interrupted. But in fact, this switching time is very short, usually between 2 to 10 milliseconds, and the computer's own power supply should be able to maintain about 10 milliseconds when the power is off, so the personal computer system generally does not display the switching time because of this. Question!
UPS backup power is the most commonly used. It has the most basic and important UPS functions, such as automatic voltage regulation and power failure protection. Although the conversion time is usually about 10 milliseconds, the AC output of the inverter is a square wave, not a sine wave. However, because of its simple structure, low cost and high reliability, Wave is widely used in microcomputers, peripheral equipment, POS machines and other categories.
Features of offline UPS
Function description
Synchronous conversion between main power supply and UPS.
Ff offline UPS regulates the output voltage through closed-loop PWM.
Rechargeable battery charging, smart settings.
④Communicate with the computer through the serial port.
Function description
Offline power UPS has the characteristics of simple structure, small size, light weight, simple operation and low cost.
Offline UPS has high power conversion efficiency.
Yes It has a relatively complete self-protection system, such as: emergency warning for low battery voltage, over-current and short-circuit protection, over-discharge protection, etc.
④When the mains power is normal, the UPS has almost no solution to the mains socket, and it is directly exported to the load, which has a poor attenuation effect on mains noise and surge.
Offline UPS means that under normal conditions, the mains power directly supplies power to the load, and the mains power runs next to it, directly supplying power to the load. Only when there is a power failure, it is powered by the UPS, and the battery is converted into AC power to supply power to the load through battery energy storage. Usually the main power supply is interrupted and converted to UPS power supply. The switching time is very short, so offline UPS cannot be used in precision systems.