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AN2946 데이터시트(PDF) 16 Page - STMicroelectronics

부품명 AN2946
상세설명  Solar-LED streetlight controller with 25 W LED lamp driver
PDF  38 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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AN2946 데이터시트(HTML) 16 Page - STMicroelectronics

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Hardware design
AN2946
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Doc ID 15473 Rev 2
Figure 15.
Charging current versus solar module output voltage
The charging current is measured against different output voltages of the solar module. A
DC source is used to simulate the solar module output and when its voltage changes from
13.1 V to 19.1 V, the charging current is limited to around 0.5 A. This demonstrates the
proper operation of the first stage.
●
Stage 2:
In stage 2, when 11 V
< V
BATTERY < 14.3 V, MPPT is implemented. To simulate the V-I curve
of the solar module, the test method is proposed as shown in Figure 16 with two important
equations below.
Equation 1
Equation 2
Figure 16.
MPPT test diagram
The V-I curves of this test system and charger power are shown in Figure 17.
Usc
Udc
R Isc
⋅
–
=
Psc
Usc Isc
Udc
R Isc
⋅
–
() Isc
⋅
=
⋅
=



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