Side-by-side reference

Understand the difference.

Compare the meaning, drawing context and source references of two entries. A similar graphic or shared abbreviation does not establish equivalence.

First referenceCompare with

UPS VFI

Symbols

Online double-conversion UPS

In an online double-conversion UPS the load is always supplied by the inverter. The rectifier converts incoming AC to DC, the battery floats on the DC link, and the inverter produces a regulated output that is independent of input voltage and frequency variations. When the input fails, the battery simply takes over the DC link with no transfer.

Drawing use: SLD
Application: Microgrid systems
Reference family: IEC / IEEE / ANSI

A distinction that matters

An online UPS powers the load through the inverter all the time; a line-interactive UPS passes mains to the load and only inverts during disturbances.

Full reference

UPS AC

Symbols

AC uninterruptible power supply

An AC UPS provides a documented AC load supply through its normal and backup operating arrangements. The schematic identifies input, output and energy-storage interfaces as specified by the product.

Drawing use: SLD / Schematic
Application: Microgrid systems
Reference family: Manufacturer

A distinction that matters

An AC UPS output is different from the DC output of a DC UPS module.

Full reference

Original educational previews. Follow the source references on each full entry for the appropriate standard or selected product.