Patent ID: 7414381

Claim:
A power supply system comprising: a host power management unit configured to execute a power management routine; a charging circuit for controlling a system charging parameter provided to a plurality of batteries by a DC to DC converter, said charging circuit further comprising: a first path configured to monitor a first battery charging current provided to a first battery; a second path configured to monitor a second battery charging current provided to a second battery; a third path configured to monitor a first battery charging voltage provided to said first battery; and a fourth path configured to monitor a second battery charging voltage provided to said second battery; and a regulating circuit configured to reduce said system charging parameter provided to said plurality of batteries by said DC to DC converter if said first battery charging current exceeds a first maximum charging current level or said second battery charging current exceeds a second maximum charging current level, or said first battery charging voltage exceeds a first maximum charging voltage level when said first battery and said second battery are coupled in parallel, or said second battery charging voltage exceeds a second maximum charging voltage level, said first and said second maximum charging current levels and said first and said second maximum charging voltage levels provided to at least one input terminal of said charging circuit by said host power management unit.