QUALCOMM Incorporated
TRICKLE CHARGING AND PRECHARGING A DEAD MULTI-CELL-IN-SERIES BATTERY

Abstract:

Methods and apparatus for trickle charging and precharging a dead multi-cell-in-series battery. One example battery charging circuit generally includes a charge pump circuit comprising a plurality of switches, being coupled to first and second power supply nodes, and being configured to multiply (or divide) a first voltage at the first power supply node to generate a second voltage at the second power supply node; a driver circuit configured to drive the plurality of switches in the charge pump circuit; and an arbiter having a first input coupled to the first power supply node, a second input coupled to the second power supply node, a third input coupled to a third power supply node having a third voltage, and an output coupled to a power supply terminal of the driver circuit, the arbiter being configured to select between the first, second, and third voltages to power the driver circuit.