How Active EMI Filter ICs Reduce Common-Mode Emissions In Single- And Three-Phase Applications (Part 4): Loop-Gain Analysis

by Timothy Hegarty, Texas Instruments, Phoenix, Ariz., How2Power Today, Jun 15 2024

Focus:
Deriving a choke model as discussed in parts 2 and 3 is an essential step in EMI filter designs, as the choke impedance directly impacts filter attenuation as well as stability performance in active designs. To this end, the fourth and final installment in this series examines small-signal stability by deriving loop-gain expressions for a feedback-type, voltage-sense current-inject (FB-VSCI) active EMI filter (AEF) circuit implemented using TI’s TPSF12C3-Q1. To validate the proposed analytical approach, the article concludes with simulations and experimental measurements applied to a three-phase EMI filter suitable for an automotive onboard charger application.

What you’ll learn:

• How to analyze and stabilize the control loop in an active EMI filter circuit

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