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Sunday, October 18, 2009

Lead Acid Battery Charger Circuit Using MAXIM Chip

This is battery charger circuit that is use a fly back converter topology, and implements a current-limited power supply to charge lead-acid batteries. This circuit is control by MAX471 and MAX733 IC. This is the figure of the circuit.

The flyback transformer provide isolation and voltage input range flexibility, event at supply voltage lower that the battery voltage. Monitoring the charging current is done by sensing the output using MAX471 IC current sense amplifier. The result of the output current monitoring is then used to give a feedback to a threshold detector, to detect if the value falls below the predetermined threshold. This detection is used to switch the charger into trickle mode, when a lower voltage is applied for lower charging current. [Schematic source: Maxim Integrated Products Application Notes]

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