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March 04th 2018
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Ups systems

An uninterruptible power supply is an electrical apparatus that provides emergency power to a load when the mains power source fails. A UPS will provide near-instantaneous protection from input power interruptions, by supplying energy stored in batteries, super-capacitors, or flywheels. The on-battery runtime of most uninterruptible power sources is relatively short, but sufficient to start a standby power source or properly shut down the protected equipment.

Key elements:

  • Inverter
  • Battery system

Main components:

  • Power modules / IGBT
  • Capacitors
  • Laminated busbars for reducing inductance
  • Batteries, super-capacitors

Frequent topologies:

  • Passive standby
  • Line-interactive
  • Double-conversion