PFC stands for Power Factor Correction.

Power Factor is the ratio of the real power of a power supply to its apparent power. In an AC circuit, the current waveform may not fully match the voltage waveform, resulting in a difference between the phase of the current and the phase of the voltage. Power factor describes the phase relationship between current and voltage and has a value ranging from 0 to 1.

Traditional power supply equipment, such as inductive linear power supplies, has a relatively low power factor, typically around 0.5 to 0.7. This means the equipment needs to consume more apparent power to deliver the required real power, reducing the utilization efficiency of the power grid.

Power Factor Correction (PFC) is a technique intended to improve the power factor of power supply equipment, bringing it as close as possible to 1. PFC uses circuits and components to correct the phase difference between current and voltage, reducing reactive power consumption and improving power supply efficiency.

Power supply equipment with a high power factor can effectively reduce harmonic pollution in the power grid, reduce line losses, improve grid energy utilization, and comply with energy standards and regulatory requirements in many countries and regions.

In conclusion, Power Factor Correction (PFC) is a technique for improving the power factor of power supply equipment. By improving the phase relationship between current and voltage, it reduces reactive power losses to improve power supply efficiency and reduce wasted energy.