Infineon D2 PAK User Manual page 8

Full-bridge converter for UPS
2 2
D PAK/ D PAK-7 kit
UG_1801_PL16_1802_225559
Figure 8 Typical input and output power measurement after 1 hour
W. The reset time for the transformer is about 20 µs, as shown in Figure 9, which is much less than the dead-time
The average efficiency shown in Table 1 is 96.5 percent at 420 W load. The average total power loss is about 13
of 700 µs. The MOSFET turn-off waveforms are shown in Figure 10. Since I
current probe (C2), its zero level has an offset (I22 = -25 A), as shown in Figure 11. The turn-off switching power
loss can be calculated as:
f(Hz)× ∫ [ ( ) − 22] ∙ ( )
= 50 Hz ×|(116 µJ – (25 × 16.7 µ))| = 15 mW.
The turn-off switching power loss for Q2, 3 and 4 is 16, 17 and 13 mW, respectively. Therefore, switching power
losses are negligible.
User Guide
C1: I t (20 A/div)
ou
C2: V - V (10 V/div)
out2 out1
C3: I (20 A/div)
in
C4: V (5 V/div)
in
Table 1 Efficiency after 1 hour
No.
1
2
3
4
5
6
7
8
Average
Stdev
= f(Hz) × [(F12 - F11 - I22.(F22 - F21)]
8
Efficiency
(percent)
96.5
96.5
96.5
96.7
96.6
96.7
96.3
96.3
96.5
0.1
was measured by a Rogowski coil
ds
Revision 1.0
2018-03-01