Charge mode control in a battery charger

Details Charge mode control in a battery charger Charge mode control in a battery charger

1996-12-02

1998-10-13

Tso, Edward

Electricity: battery or capacitor charging or discharging

Battery or cell charging

With peak detection of current or voltage

320160, 320161, H02J 704, H02J 716

Patent

active

058217363

ABSTRACT:
A control circuit controls a battery charger so as to prevent damage to NiCAD or NiMH batteries resulting from overheating due to overcharging. During charging, the battery voltage is monitored through a filter, buffer, amplifier and sample and hold circuit. The sampled voltage is time differentiated to determine its rate of change, and a control signal is generated for switching the battery charger from a rapid charge mode to a trickle charge mode when the negative rate of change of the battery voltage exceeds a pretermined reference voltage, thereby identifying that the battery voltage has started to decay from its peak voltage.

REFERENCES:
patent: 4354148 (1982-10-01), Tada et al.
patent: 4746852 (1988-05-01), Martin
patent: 4755735 (1988-07-01), Inakagata
patent: 5304917 (1994-04-01), Somerville
patent: 5307001 (1994-04-01), Heavey
patent: 5489836 (1996-02-01), Yuen

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