Many systems require long time operation during periods of power loss. Often a LeadAcid battery (gel or wet-cell) is found to be the best solution because of the high capacityand relative low cost. The battery is charged during normal operation, and used to powerthe system during power loss. These systems require a circuit to charge the battery aswell as regulate voltage for the system Vcc. In these systems one must provide a currentlimited voltage to the battery for charging, while developing system Vcc in both thecharge or discharge condition.
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