Evm Connections; Figure 4-2. Evm Setup Schematic For A Three-Phase, Three-Wire System - Texas Instruments TPSF12C3QEVM User Manual

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Alternatively, for a three-wire system without neutral, connect S4 to GND and tie the inject capacitor to the
star-point of X-capacitors C
L
CM1-AEF
L1
C
X1
L2
AC
C
source
X2
L3
C
X3
PE
Y-rated sense and
inject capacitors

Figure 4-2. EVM Setup Schematic for a Three-Phase, Three-Wire System

An AC/DC regulator as shown in
is drawn here for illustrative purposes. The setup is essentially agnostic to regulator topology. Note that
the appropriate three-phase LISN connects between the input source and the EMI filter for conducted EMI
measurement. To accurately benchmark the AEF circuit performance in terms of CM noise reduction, use a
three-phase DM/CM separator at the LISN outputs to extract the CM noise signature from the total noise
measurement.
The EVM daughter-card mounts to the main EMI filter solution. As illustrated in
an 8-pin right-angle header, part number TSW-108-08-G-S-RA, connects the EVM to a corresponding female
receptacle, part number SSW-108-01-G-S, which mounts on the EMI filter board that carries the passive filter
components – CM chokes and Y-capacitors – as well as the sense and inject capacitors. Both header and
receptacle, manufactured by Samtec, are included with the EVM. See

4.2 EVM Connections

As highlighted in Table 4-1, header J1 provides an interface from the EVM to the EMI filter board with access to
the following terminals: S1, S2, S3, S4, GND, INJ, VDD and EN.
Connect sense pins S1, S2, S3 and S4 to the four sense capacitors, designated as C
C in Figure 4-1. Connect the opposite terminals of the sense capacitors to the L1, L2, L3 and NEUTRAL
SEN4
lines between the CM chokes, L
neutral is unavailable, except S4 is tied to GND as shown in
SLVUCM2 – JANUARY 2023
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, C , C as shown in Figure
X4 X5 X6
C C
C
SEN3 SEN2
SEN1
GND
S4 S3 S2 S1
J1
NC IGND
VDD INJ
NC NC
SENSE1 COMP2
SENSE2 COMP1
SENSE3 REFGND
SENSE4 EN
TI standalone active EMI filter EVM
Figure 4-1 and Figure 4-2
and L . The connections are similar for a three-wire system where the
CM1 CM2
Copyright © 2023 Texas Instruments Incorporated
4-2.
L
CM2-AEF
C
X4
C
X5
C
X6
C
INJ
To enable the IC, leave EN open or
connect it to VDD using a jumper
INJ VDD
EN
represents a typical three-phase regulator and
Bill of Materials.
Figure 4-2.
TPSF12C3QEVM Active EMI Filter Evaluation Module for Three-Phase AC
EVM Setup, Connections and Validation
C
X7
C
regulator
X8
C
X9
C C C
Y1 Y2 Y3
Chassis (PE)
Chassis-referred bias power supply
Voltage range: 8 V to 16 V
Current rating: 50 mA max.
= AC/DC regulator
= Three-phase AC source
(no neutral)
= Three-phase AEF IC
Y-rated sense and
=
inject capacitors
= 8-pin header
Figure 4-1 and Figure 4-2,
, C , C and
SEN1 SEN2 SEN3
Power Systems
AC/DC
Chassis
7