User Guide
17
Revision 1.0
2018-03-01
Full-bridge converter for UPS
D
2
PAK/ D
2
PAK-7 kit
UG_1801_PL16_1802_225559
Table 6
Efficiency after 1 hour
No.
Efficiency
(percent)
1
97.1
2
97.0
3
97.1
4
96.9
5
97.0
6
97.1
7
97.0
8
97.1
Average
97.0
Stdev
0.1
1.8.3
Performance with heatsink at the front with 500 W
As shown in Table 7, the average efficiency is 97 percent, which is 0.4 percent higher than that with the heatsink
at the back, shown in Table 4. The temperature readings at the middle (47
°
C) and location A (52
°
C) shown in
Figure 19 are both higher than those (43
°
C and 45
°
C) shown in Figure 6 due to the additional 80 W of load.
With the same load at 500 W, the temperature reading (52
°
C) at A shown in Figure 19 is higher than that (49
°
C) in
Figure 17, while the reading (48
°
C) at B in Figure 20 is lower than that (49
°
C) in Figure 18. This behavior is
different to that with D
2
MOSFETs. The reason is that with the D
2
7-pin package more heat can be transferred to
the PCB, which makes the heatsink more effective when it is located at the back. This explains why the efficiency
with the heatsink at the front is the same as that with the heatsink at the back with D
2
7-pin MOSFETs.
Table 7
Efficiency after 1 hour
No.
Efficiency
(percent)
1
96.9
2
96.9
3
97.1
4
97.1
5
97.1
6
96.9
7
97.0
8
96.9
Average
97.0
Stdev
0.1
