as i impement the notch filter in PLECS, seems it doesn’t work,
as input a PFC output voltage with 100Hz RIPPLE, but output the exact same output without filter effective.
PLECS version: 4.8.6
The notch frequency for the transfer function you entered is not 100 Hz but rather 100 Radians/sec (15.915 Hz). Given the Q factor your filter, the 100 Hz component is unaltered.
Dear bryan
it’s really nice to catch the feedback,
actually, i want to know what’s the problem with the implementation, i’ve tried use continuous transfer function but not worked, i had made the model by mathcad, and it output the same graphic as you shared;
if i can download any function model(continuous/ discrete) to evaluate;
thanks a lot;
petros Li
+86 18576628096
The horizontal axis in my graphic is Radians/sec. I suspect that is the case in your Mathcad script as well. In that case you can simply make sure you consistently use Radians/sec or Hz and apply 2π factors where needed. As for the basic design of a notch filter, this is explained in many textbooks and references.
I’m aware of two demo models that use notch filters the “Three-Level Boost PFC Converter” PLECS demo model and the “On-board Charger” TI C2000 TSP model. The On-board charger model is more sophisticated in that it also determines the discrete transfer function coefficients using Tustin with prewarp at the notch frequency.