Example: 100 W CCM PFC

  • Number of switching cycles per line cycle varies with load current
  • You might get 3560.7 or 3561.2 switching periods per line period instead of a nice round 3561
    • POP will fail
  • No POP, no AC

 

For POP to succeed, we need the total number of switching periods in an AC line cycle, when added together, to equal exactly one AC line period.