Test Procedure
8
Test Procedure
8.1
Efficiency Measurement Procedure
1. Refer to
for basic setup to measure power conversion efficiency. The required equipment to
do this measurement is listed in
2. Before making electrical connections, visually check the boards to make sure there are no suspected
spots of damages.
3. In this EVM package, three EVMs are included, UCD3138PFCEVM-026, UCD3138CC64EVM-030,
and USB-TO-GPIO. In this measurement, the board of UCD3138PFCEVM-026 and
UCD3138CC64EVM-030 is needed.
4. First install the board of UCD3138CC64EVM-030 onto the board of UCD3138PFCEVM-026. Care must
be given to the alignment and the orientation of two boards, or damage may occur. Refer to
for UCD3138CC64EVM-030 board orientation.
5. Connect the AC voltage source to J1 (Line) and J2 (Neutral). The AC voltage source should be an
isolated one and meet IEC60950 requirement. Set up the AC output voltage in the range specified in
, between 90 V
AC
and 264 V
AC
, between 47 Hz and 63 Hz; set up the AC source current limit to
7.5-A peak and RMS, respectively.
6. Connect an electronic load with either constant current mode or constant resistance mode. The load
range is from 0 A to 0.92 A. Initial power on is recommended with 0-A load current. The load is
required to receive 0 V
DC
to 500 V
DC
.
7. If the load does not have a current or a power display, a current meter is needed to insert into between
the load and the board.
8. Connect a volt-meter across the load and set up the volt-meter scale 0 V to 500 V on its voltage, DC.
9. Turn on the AC voltage output and varying the load. Then the measurement can be made.
WARNING
Danger of Electrical Shock! High voltage present during the
measurement!
Danger of Heat Burn from High Temperature!
Do not leave EVM powered when unattended!
8.2
Equipment Shutdown
1. Shut down AC voltage source.
2. Shut down electronic load.
11
SLUU885B – March 2012 – Revised July 2012
Digitally Controlled Single-Phase PFC Pre-Regulator
Copyright © 2012, Texas Instruments Incorporated