Technical FAQs 4

What is an uninterruptible power supply (UPS)?

One method of protecting sensitive equipment against power interruptions is the uninterruptible power supply (UPS). The UPS has become very popular as the cost of power electronics has decreased. Figure 1 shows the principles of operation of an electronic UPS. Single- or three-phase power is obtained from the power system and is rectified to DC.

How does an uninterruptible power supply work in standby mode?

It operates in standby mode until a power outage occurs. Here’s how does a uninterruptible power supply work in standby mode: Normal Mode: The connected equipment is powered directly by the mains, and the UPS remains idle. Power Outage: When the mains power fails, the UPS switches to battery power and supplies the load.

How do uninterruptible power supplies work in a line-interactive system?

Here’s how do uninterruptible power supplies work in a line-interactive system: Voltage Regulation: The UPS uses an automatic voltage regulator (AVR) to correct minor power fluctuations without switching to battery power. Power Outage: During a power failure, the UPS instantly switches to battery power to ensure continuous power to the load.

What are the different types of ups power supply?

Typically, according to different working principles, UPS power supply covers standby (offline) UPS, line-interactive UPS, online (double-conversion) UPS. The standby UPS system offers only the most basic features, providing surge protection and battery backup. Thus, its power supply quality is not good enough and the cost is much lower.

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AC Uninterruptible Power Supply Working Mode

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