Power Factor Correction (PFC) Basics
●Power factor (pf) is defined as the ratio of the real power (P) to apparent power (S), or the cosine (for pure sine wave for both current and voltage) that represents the phase angle between the current and voltage waveforms (see Figure 1). The power factor can vary between 0 and I, and can be either inductive (lagging, pointing up) or capacitive (leading, pointing down). In order to reduce an inductive lag, capacitors are added until pf equals I. When the current and voltage waveforms are in phase, the power factor is I (cos (0°) = I). The whole purpose of making the power factor equal to one is to make the circuit look purely resistive (apparent power equal to real power).
●Real power (watts) produces real work; this is the energy transfer component (example electricity-to-motor rpm). Reactive power is the power required to produce the magnetic fields (lost power) to enable the real work to be done, where apparent power is considered the total power that the power company supplies, as shown in Figure I. This total power is the power supplied through the power mains to produce the required amount of real power.
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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2021/8/6 |
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REV. 0.9.0 |
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AN-420 |
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698 KB |
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