Uninterruptible Power Supply (UPS)

Reliability of power sources is an increasing challenge in many sectors and battery-backed uninterruptable power supplies (UPS) are one option to protect and keep electronic equipment operating in the event of grid power failure. The three major UPS configurations are offline (also called standby and battery backup), line-interactive and online double conversion. While online systems are the most complex and costly, they provide waveform conditioning during normal mains supply and are even becoming bidirectional to connect to smart grids. To deliver all of this, UPS systems have become more reliable and offer greater availability while reducing energy losses and costs with the move to transformerless and modular systems.

Block diagram

Design considerations

  • UPS systems can be either offline or online, with online offering  zero time delay when switching its power source compared
  • Design must ensure adequate load balancing, voltage, and current protection, charge and discharge control, thermal management, fan control, monitoring, and communications.
  • Designs can use a two-level topology but three-level Neutral Point Clamped (NPC) inverter topologies (T-NPC, A-NPC, or I-NPC) offer better efficiency and reduce EMI

MOSFET and GaN FET Handbook

Drawing on over 20 years’ of experience, the MOSFET and GaN FET Application Handbook: A Power Design Engineer’s Guide brings together a comprehensive set of learning and reference materials relating to the use of MOSFETs and GaN FETs in real world systems.

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