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AN2946 데이터시트(PDF) 25 Page - STMicroelectronics

부품명 AN2946
상세설명  Solar-LED streetlight controller with 25 W LED lamp driver
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제조업체  STMICROELECTRONICS [STMicroelectronics]
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AN2946 데이터시트(HTML) 25 Page - STMicroelectronics

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AN2946
Firmware design
Doc ID 15473 Rev 2
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4.2.2
Battery charging management
Figure 31.
Three-stage charging routine
The battery charging flowchart is illustrated in Figure 31. The MPPT algorithm is involved in
stage 1 and stage 2 charging. The stage 1 is a current constraint. In stage 3, the charger
keeps changing the charging current to maintain a constant charging voltage.
The MPPT algorithm illustrated in Figure 32, simplifies the conventional P&O method. Since
battery voltage cannot drastically change in a short period, the maximum power point must
lie on the maximum current point. This allows the MCU to compare current instead of a
power comparison which is more complex for an embedded system.
Figure 32.
MPPT flowchart



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