To develop offline power supplies that use PFC (power-factor correction), you must first understand the meaning of PFC and the regulations that surround the design of offline power supplies. PFC ...

Download this article in PDF format. Your utility Power Factor is the ratio of the system’s Real Power and the Apparent Power (Eq. 1, Fig. 1). This unitless factor ranges from −1 to 1.

The power factor tells you how much less power they are producing. For example, a power factor of 0.8 means your motor is only using 80 percent of the maximum available power.