Frequently Asked Question

APFC (Active Power Factor Correction)
Last Updated 3 years ago

Today many PCs and IT equipment are equippped with APFC (Active Power Factor Correction) power supplies. The purpose of the APFC is to reduce reactive power, which is not directly responsible for performing the work, but it is causes losses.

In the principle APFC bases on switching capacitors to the circuit when the power factor drops, each capacitor must be energized at the moment of switching on and hence consumes more energy.

Due to the fact that loads with APFC draw higher energy at start-up, UPSs without support for APFC loads must be oversized. Depending on the architecture of the load it might require 2-5 times oversizing the power.

By the construction, all UPSs with pure sine wave output will support APFC loads, that includes all online models. Special "APFC support" can be implemented in VFD and VI models to boost the performance with APFC loads. With PWM control, some of our UPSs purposely provide more energy at the start-up of APFC loads without tripping overcurrent breaker. Without the need to oversize the UPS, the user may enjoy up to 50% energy saving and 34% cost saving compared to non-APFC-supported UPS.
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