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I see the assumption that the input AC volatge is clean (pure AC), in almost all PFC explanation articles.

What if the input AC has some harmonics, say a volatge distortion factor of 10%, would it anyway affect the PFC operation? I see the inner current loop is fast responding, hence would the harmonics in input voltage cause instability?

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Power factor is well defined for non-sinusoidal waveforms, too. PF → 1 does indeed replicate the voltage waveform in the current waveform.

I don't have any examples to hand right now, but I can confirm having seen it in practice. Mains voltage in my area has a slight tilted flat to the peaks, I don't know what THD exactly, but it is visible on the oscilloscope.

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  • \$\begingroup\$ So if there is a distortion in volatge waveform ( eg: tilt), the same will be replicated by PFC control circuit in current waveform as well, Correct? \$\endgroup\$
    – Dynamic_equilibrium
    Commented Jul 30 at 9:39
  • \$\begingroup\$ @Dynamic_equilibrium Yes \$\endgroup\$
    – Kuba hasn't forgotten Monica
    Commented Jul 30 at 14:59

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