Battery charge controller having an adjustable termination curre

Details Battery charge controller having an adjustable termination curre Battery charge controller having an adjustable termination curre

1999-08-18

2000-10-17

Wong, Peter S.

Electricity: battery or capacitor charging or discharging

Battery or cell charging

Pulsed

320160, 320164, H02J 700

Patent

active

061337129

ABSTRACT:
A battery charge controller has charge termination values that can be adjusted according to the initial charging current values so that charging is discontinued at a same charge level for all battery cells to prevent overcharging and undercharging. The battery charge controller includes a DC/DC converter that is coupled to a supply voltage and that provides a charging current to a battery, and a gain controller coupled to the DC/DC converter. The gain controller provides first and second gain-adjusted signals associated with the charging current. The charge controller further includes a charge termination detector that compares the level of the second gain-adjusted signal to a first predetermined reference signal and based on the comparison generates a charge termination signal. A pulse-width controller is coupled to the DC/DC converter. The pulse-width controller compares the charge termination signal, the first gain-adjusted signal, and a charging voltage of the battery to a second predetermined reference signal to vary a duty cycle of the DC/DC converter to vary the charging current supplied to the battery

REFERENCES:
patent: 5382893 (1995-01-01), Dehnel
patent: 5402055 (1995-03-01), Nguyen
patent: 5625275 (1997-04-01), Tanikawa et al.
patent: 5701068 (1997-12-01), Baer et al.

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