1. Online and backup UPS can be divided into two types based on their working principles: OFFLINE and ONLINE. From the perspective of backup time, it can be divided into two types: standard type and long-term type. In principle, the main difference between online UPS and backup UPS is that backup UPS only stabilizes the mains power when there is mains power, and the inverter does not work and is in a waiting state. When the mains power is abnormal, the backup UPS will quickly switch to the inverter state, reversing the battery energy into AC power to continue supplying power to the load. Therefore, backup UPS will have a transition time from mains power to reverse operation, which is generally less than 10ms. After online UPS is turned on, the inverter is always in working state, so there is no interruption time when the mains power is abnormal and the battery is discharged, that is, zero interruption.
2.In addition to the above two types, there is another type of online interactive UPS called Line Interactive, such as the Inter series. The so-called online interactive UPS refers to the inverter of the UPS working in reverse to charge the battery pack when the input mains power is normal. When the mains power is abnormal, the inverter immediately starts to invert and convert the battery pack voltage into AC power output. Therefore, online interactive UPS also has conversion time. Compared with backup UPS, online interactive UPS has stronger protection function, better inverter output voltage waveform, generally sine wave, and its biggest advantage is its strong software function. For example, the Inter series UPS comes with monitoring software, which can easily access the internet for remote control and intelligent management of UPS.
3. In addition to the above three categories, UPS can also be divided into standard and long-term models based on backup time. The standard machine is equipped with a built-in battery, and the backup power supply time is relatively short, usually 5-15 minutes. Long lasting machines can increase battery capacity configuration and extend backup time according to user needs. But this requires larger chargers to meet the needs of battery charging current and charging time, so manufacturers will increase the charger capacity or install parallel chargers during design. From the perspective of backup time, UPS can be divided into two types: long-term and standard. Generally speaking, standard aircraft come with a battery pack that can maintain power supply for a short period of time (usually not exceeding 25 minutes) after a power outage; The long-term machine does not come with a battery, but a charger has been added. Users can connect multiple sets of batteries according to their own needs to extend the power supply time.