Texas Instruments TPSF12C3QEVM User Manual page 5

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2 Hardware
2.1 EVM Description
The TPSF12C3QEVM, a daughter-card design that attaches to an existing passive EMI filter circuit in a three-
phase AC power system, showcases the CM EMI performance improvement or size reduction achievable with
the TPSF12C3, a three-phase power-supply filter IC.
The EVM can be used for evaluation and for system development of a three-phase EMI filter circuit and
application. The AEF circuit effectively replaces the set of Y-capacitors normally placed between the CM chokes
(and tied to chassis ground) in a conventional two-stage, fourth-order passive CM filter design. The design uses
a recommended PCB layout
The damping and compensation component values included with this EVM can require modification
if the passive filter components (the CM chokes in particular) are changed. Refer to the
Standalone Active EMI Filter for Common-mode Noise Mitigation in Single-Phase AC Power Systems
data sheet and TPSF12C3
operation, loop gain and stability analysis, passive component selection, and expected common-mode
EMI performance.
2.2 Setup
Figure 2-1 shows a typical EMI measurement setup. A line impedance stabilization network (LISN) in series
with each supply line and an EMI receiver provide a measurement of the total EMI that includes DM and CM
propagation components. Appropriate addition or subtraction of the total noise measurement from each LISN,
designated as V , V , V
1 2 3
respectively.
L1
3- + N
L2
input source
L3
N
V + V + V + V
1 2 3 4
V =
CM
4
PE
Figure 2-1. EMI Measurement Setup for a Three-Phase System
SLVUCM2A – JANUARY 2023 – REVISED JULY 2023
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to minimize the overall noise signature and required board area.
quickstart calculator
and V in Figure 2-1, enables an examination of CM and DM noise signatures,
4
EMI
receiver
V
LISN
1
DM loop area
+
Reference ground plane
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Note
for additional guidance pertaining to AEF circuit
Hot surface. Contact can cause burns. Do not touch.
High Voltage. Risk of electric shock.
Chassis
3- EMI
filter
CM loop area
Active EMI Filter Evaluation Module for Three-Phase AC Power Systems
Hardware
TPSF12C3
CAUTION
CAUTION
3- AC/DC
V
OUT+
regulator
Load
(EMI source)
V
OUT–
The load may
be floating or
tied to chassis
GND for safety
Chassis bonded
to the GND plane
5