What is the correct topology for the PFC capacitor placement when a ballast is being used? There are 2 options as follows:
Option 1: Variac followed by PFC capacitor followed by the ballast followed by the pole transformer
Option 2: Variac followed by ballast followed by PFC capacitor followed by the pole transformer
I have been using option 1 which appears to work correctly. I suspect that either option is valid. The only difference between the 2 would be a different value of capacitance required for the same amount of power factor correction.
Steve White
Cedar Rapids, Iowa
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