I. Classification by Working Principle
Standby UPS (Offline UPS)
A standby UPS directly supplies power from the utility when it is normal, but quickly switches to battery power when the utility fails. The switching time is extremely short (≤10ms), and the output waveform is a square wave. Due to its low cost, it is suitable for ordinary computers or household devices. However, it should be noted that a standby UPS cannot suppress utility interference, resulting in average power quality.
Online UPS (Double Conversion UPS)
An online UPS works by continuously converting utility power through a rectifier and inverter before supplying it, eliminating any switching time. This type of UPS provides a pure sine wave output with high power quality, making it ideal for critical applications such as data centers and medical equipment. However, it should be noted that online UPS systems are more expensive and have relatively lower efficiency.
II. Classification by Application Scenario
Information Technology (IT) Sector
In the IT sector, servers, data centers, and network equipment are typically equipped with online UPS systems and dual power redundancy.
Medical Sector
The medical sector has extremely high requirements for continuous power supply, usually deploying long-runtime UPS (backup time ≥30 minutes).
Industrial & Transportation Sectors
Industrial and transportation sectors typically use industrial-grade UPS (dustproof, vibration-resistant) with modular designs to support capacity expansion.
Finance & Telecommunications Sectors
The finance and telecommunications sectors usually adopt dual-machine parallel or "1+1" redundancy solutions to eliminate single points of failure.