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A PFC (power factor correction) function corrects phase shifting between voltage and current by providing a triangular waveform current to inductor, then controlling the average current of the triangular waveform to be sinusoidal.

There are two modes as follows.

・Continuous current mode (CCM)　---　for mid./large power over 600 W
・Critical current mode (CRM)　---　for small/mid. power under 300 W

 

CCM PFC ICs and CRM PFC ICs are different from each other. Also, CRM mode can be single or interleaving.

 

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CRM Single & CRM Interleave

CRM single(for small power, below 300W)
CRM Interleave (for to mid./large power, 300W-1ｋW)
Two sets of MOSFET, inductor and diode work alternatively in interleave PFC

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