There are differences between online interactive UPS and backup UPS in terms of working principle, output power quality, conversion time, and applicable scenarios, as follows:
Working principle
Online interactive UPS: When the mains power is normal, it stabilizes the mains power through a bidirectional converter and supplies power to the load, while also managing the charging and discharging of the battery. When the mains power is abnormal, the bidirectional converter converts the DC power of the battery into AC power to supply power to the load.
Backup UPS: When the mains power is normal, it directly supplies power to the load through the UPS, and at this time, the UPS only charges the battery. When there is a power outage or abnormality in the mains, the relay inside the UPS switches to the battery inverter circuit, which converts the DC power of the battery into AC power to supply power to the load.
Output power quality
Online interactive UPS: capable of stabilizing and filtering the mains power to a certain extent, the output power quality is relatively good, the voltage and frequency stability is high, and it can effectively suppress some interference and fluctuations in the mains power, providing relatively pure power for the load.
Backup UPS: When the mains power is normal, the load is directly supplied by the mains power, and fluctuations and interference from the mains power will directly affect the load. After switching from mains power outage to battery power supply, although the inverter can provide stable AC power, there may be slight fluctuations in voltage and frequency at the moment of switching, and the overall output power quality is slightly inferior to online interactive UPS.
conversion time
Online interactive UPS: Due to its ability to quickly switch to inverter mode in case of abnormal mains power, the bidirectional converter has a short conversion time, usually between a few milliseconds to tens of milliseconds, and can provide uninterrupted power support to the load quickly.
Backup UPS: Switching from mains power to battery inverter power requires relay switching, which is relatively slow and usually takes between 10 milliseconds and 100 milliseconds. Although it may not have a significant impact on some ordinary devices, it may have a brief effect on some devices that are sensitive to power outages.
Applicable scenarios
Online interactive UPS: suitable for small offices, home office environments with certain requirements for power quality, such as computers, servers, network equipment, etc. It can protect equipment from the impact of mains power fluctuations to a certain extent, and the price is relatively moderate, with good cost-effectiveness.
Backup UPS: mainly suitable for situations where power interruption is not very sensitive and power quality requirements are not particularly high, such as computers, printers, routers and other equipment in general households, as well as some small office equipment that is more cost sensitive. It can provide basic power guarantee during power outages, preventing equipment damage or data loss due to sudden power outages.
