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AN2946 bảng dữ liệu(PDF) 17 Page - STMicroelectronics

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AN2946 bảng dữ liệu(HTML) 17 Page - STMicroelectronics

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AN2946
Hardware design
Doc ID 15473 Rev 2
17/38
Figure 17.
V-I curve and PSC
According to Equation 1 and Equation 2, the maximum power point (MPP) occurs at
Usc = 0.5 × Udc. A different R value results in different output power at the MPP delivered to
the charger. From Table 2 as long as Udc is 36 V, Usc is kept at18 V no matter what the R
value is. Table 3 shows the result with fixed R and variable Udc. Usc is always half of Udc
during steady state. Thus the test diagram shows the way to find the MPP during the test.
Table 2.
Test results for different values of R (Vdc = 36 V)
R[
Ω]
Usc [V]
Isc [A]
Uba [V]
Iba [A]
Charger
efficiency [%]
4.6
18.0
3.90
13.08
5.03
93.7
5.2
18.0
3.45
13.08
4.41
94.0
6.0
18.0
3.00
13.03
3.88
93.6
7.1
18.0
2.53
12.81
3.31
93.1
8.8
18.0
2.05
12.54
2.76
93.8
11.6
18.0
1.55
12.34
2.10
92.9
17.3
18.0
1.04
12.07
1.43
92.2
34.0
18.0
0.53
11.96
0.69
86.5



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