Charging circuit for secondary battery

Details Charging circuit for secondary battery Charging circuit for secondary battery

2007-04-17

2007-04-17

Laxton, Gary L (Department: 2838)

Electricity: battery or capacitor charging or discharging

Battery or cell charging

C320S139000

Reexamination Certificate

active

11259186

ABSTRACT:
A charging circuit for a secondary battery includes a constant-voltage circuit part outputting one of a plurality of predetermined constant voltages and charges the secondary battery by applying the constant voltage thereto, a detection circuit part detecting a battery voltage of the secondary battery, and a control circuit part controlling the selection of the constant-voltage in response to the detected battery voltage. Another charging circuit includes a constant-current circuit part outputting, to the secondary battery, one of two predetermined constant currents, a constant-voltage circuit part charging the secondary battery by applying a predetermined constant voltage thereto, a battery voltage detection circuit part detecting a battery voltage of the secondary battery, a charge current detection circuit part outputting a predetermined charge completion signal, and a charge control circuit part stopping operations of the constant-current circuit part and constant-voltage circuit part when receiving the charge completion signal.

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