Power factor correction is abbreviated as PFC. it is mainly used to improve the ratio of effective power to apparent power at the input of a switching power supply. It is one of the common circuits in switch mode power supplies. Generally, the power factor of the input end of the model without PFC circuit is only around 0.4~0.6, while the active PFC circuit can reach more than 0.95. The correlation formula is as follows:

Apparent power = input voltage x input current (VA)

Effective power = input voltage x input current x power factor (W)

From the perspective of environmental protection: the power plant must generate electrical energy more than the apparent power, so that its generator set can stably supply the market's electrical energy demand, and the actual use of electrical energy is effective power. If the power factor is 0.5, it means that the generator sets need to generates more than 2VA of electricity to safely supply 1W of electrical energy, and its energy operation efficiency is poor. Conversely, if the power factor is improved to 0.95, the generator sets only need to generate more than 1.06VA, and there is no problem in supplying 1W of electrical energy, and the efficiency of energy operation is better.

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