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Full-bridge converter for UPS
2
2
D
PAK/ D
PAK-7 kit
UG_1801_PL16_1802_225559
1.4
Power-up procedure
Always connect the bias, two PWM signals and load first, then increase the input voltage from zero.
1.4.1
PWM signal selections
This user guide describes a set-up providing a 50 Hz square-wave AC output. Therefore, both PWM signals are
set with 50 Hz. The dead-time between the two legs has to be set high enough that the reset of the transformer
is completed. A shorter dead-time increases total turn-on time, which may saturate the transformer. A value of
0.9 ms was selected to do the tests. Both PWM signals have an amplitude of 10 V.
1.5
Performance evaluations
Test conditions:
V
:
12 V
in
V
:
12 V
bias
PWM 1, 2:
50 Hz, 10 V, with 10 ms delay between them plus 0.7 ms dead-time
Load:
Transformer (primary connected to V
bulbs, load of 420 W)
Airflow:
No
1.5.1
Performance with heatsink at the front
Figure 5
Front thermal image after 1 hour
User Guide
and V
, secondary connected to incandescent light
out1
out2
43°C
A:45°C
6
7 0 .0 °C
60
40
20
2 0 .0 °C
Revision 1.0
2018-03-01
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