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Hardware
2.5 AEF Design Flow
Follow these steps to design an active filter circuit:
1. Quickstart Calculator – Use the TPSF12C1
2-5
for illustration.
Figure 2-5. Quickstart Calculator With CM Choke Impedance, Loop Gain and Insertion Loss Plots
Typical steps to complete the quickstart calculator are as follows:
•
Choose the core material for the CM chokes – the primary choices being nanocrystalline (NC) or ferrite.
NC chokes are preferable for active filter designs given their higher permeability (and thus fewer winding
turns), broader impedance characteristic over frequency, more damped impedance behavior with softer
phase transition, and better stability over temperature.
•
Define the CM choke impedances – two options are available:
– Measure the CM impedance magnitude and phase vs. frequency using a network analyzer. Paste the
data directly into the calculator file.
– Enter the behavioral model parameters for each choke based on (a) a parallel LRC circuit for a ferrite
choke (L
|| R
CM
circuits connected in series along with a parasitic capacitance across the total network. An equivalent
circuit model is the most convenient option if the choke data sheet includes the CM impedance data.
•
Enter values for the grid-side and regulator-side Y-capacitors, sense capacitors and inject capacitor.
•
Enter values for source impedance of the grid supply and the noise source. Select from a drop-down
menu if a LISN (50 µH or 5 µH) is installed.
•
Review the AEF loop gain plot for stability based on the calculated component values for the damping
network. Adjust the damping network values to ensure the phase does not reach –180° at the resonant
frequencies (when the gain is positive). Refer to the TPSF12C1 data sheet for guidance on component
selection. Check the insertion loss plots with AEF enabled and disabled.
8
Active EMI Filter Evaluation Module for Single-Phase AC Power Systems
quickstart calculator
|| C
), or (b) a ladder network for an NC choke consisting of three parallel RL
PAR
PAR
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as a convenient starting point. See
SLVUCK7A – NOVEMBER 2022 – REVISED JULY 2023
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Figure
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