Power Factor

The ratio of true power to apparent power in an AC circuit. In power conversion technology, power factor is used in conjunction with describing the AC input current to the power supply.

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What is Power Factor? Input current/power factor explained

It is common in switching power supply designs to connect a bulk capacitor right after the bridge rectifier. This leads to charging of the filtering capacitor at the peaks of the input sine wave. Apparent power becomes high due to high RMS current and this leads to low PF. Current meters with “True RMS” function [...]

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