This application note is intended to demonstrate the use of the PIC14C000 in an intelligent battery charger. The charger is designed to charge a sealed lead-acid battery (YUASA NP7-12 12V, 7AH); however, the charge parameters are easily modified to work with different lead-acid batteries. The typical method of charging lead-acid batteries is with a constant voltage, current-limited source. That method allows a high initial charge current that tapers off until the battery reaches full charge. This design uses a constant current, allowing the voltage to rise until the battery voltage reaches a full charge.
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