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AC Ripple Currents in UPS DC Link

Mark Townsend

David Cunningham

In most Uninterruptible Power Supplies (UPSs), the DC link is the point at which the output of the rectifier, the input of the inverter, the DC filter, and the battery are all connected in parallel. The rectifier converts AC power from the utility or building generator to DC power. The DC power passes through the DC filter that usually consists of series inductance with shunt (parallel) capacitance. The filtered DC power is then used to charge the battery and supply the input of the inverter. The inverter converts the DC power back to AC power for the critical loads that are typically computers and their peripheral equipment.

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