Charge control method and charger for a rechargeable battery

Details Charge control method and charger for a rechargeable battery Charge control method and charger for a rechargeable battery

1998-08-21

2000-10-03

Tso, Edward H.

Electricity: battery or capacitor charging or discharging

Battery or cell charging

With peak detection of current or voltage

320161, H02J 704

Patent

active

061278106

ABSTRACT:
A method of controlling the charging of a rechargeable battery and a charger for practicing the same are disclosed. The battery voltage of the rechargeable battery, a voltage across the internal resistance of the battery and a voltage across a current setting resistor are added together and applied to the voltage detection input of a controller in the form of a sum voltage. The controller detects the sum voltages in the ON state (during charging) and OFF state(during interruption of charging) of a control FET (Field Effect Transistor), and calculates a difference between them. The controller determines, based on the difference, whether or not the battery has been fully charged, and then controls charging on the basis of the result of the decision.

REFERENCES:
patent: 5408170 (1995-04-01), Umetsu et al.
patent: 5936384 (1999-08-01), Fujiwata et al.

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