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| 介绍: |
There are many battery shapes that, unfortunately, allow users to incorrectly insert the battery. The simple circuit in Figure 1 gives a single-cell Li-ion battery charger added protection from damage due to backward battery insertion. In the circuit, the MAX1551 linear-mode single-cell Li-ion battery charger delivers the charging current to the cell from either an AC adapter or USB power supply. The MAX9001 is also powered from height=207 alt="Figure 1. This circuit protects the MAX1551 single-cell Li-ion battery charger from surge current caused by backward battery insertion." src="/data/attachment/portal/201007/ET37824201007250331591.gif" width=600>
Figure 1. This circuit protects the MAX1551 single-cell Li-ion battery charger from surge current caused by backward battery insertion.
During normal operation, the MAX9001's comparator output is high and the FET is src="/data/attachment/portal/201007/ET37824201007250331592.gif">
Figure 2. The top curve of this oscilloscope capture represents the backward insertion of the battery in the Figure 1 circuit. The bottom curve is the battery current.
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