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AN3432 датащи(PDF) 2 Page - STMicroelectronics

номер детали AN3432
подробное описание детали  How to choose a bypass diode for a silicon panel junction box
PDF  24 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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Contents
AN3432
2/24
Doc ID 019041 Rev 1
Contents
1
Photocurrent production basics of silicon solar cells . . . . . . . . . . . . . 3
1.1
The photovoltaic effect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2
The solar cell model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.3
Main parameters of solar cells . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.3.1
Short circuit current (Isc) and open circuit voltage (Voc) . . . . . . . . . . . . . . 4
1.3.2
Voc and Isc variations with ambient temperature . . . . . . . . . . . . . . . . . . . 5
1.4
Hot spot phenomenon . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2
Bypass diode inside the junction box . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.1
Bypass function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.2
Junction box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.3
VRRM is the first rating criterion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.3.1
Maximum number of solar cells to bridge with bypass . . . . . . . . . . . . . . 9
2.3.2
VRRM of bypass diode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3
Application constraints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.1
Constraints linked with the junction box characteristics . . . . . . . . . . . . . . 11
3.1.1
Power losses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.1.2
Thermal runaway risk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.2
Constraints linked with reliability test . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.2.1
Thermal test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.2.2
200 cycles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4
Optimized bypass diode for a given solar panel or junction box . . . . 20
5
Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23



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