Charge boost battery charging and protection circuit

Details Charge boost battery charging and protection circuit Charge boost battery charging and protection circuit

2005-02-01

2005-02-01

Tibbits, Pia (Department: 2838)

Electricity: battery or capacitor charging or discharging

Battery or cell discharging

With charging

Reexamination Certificate

active

06850040

ABSTRACT:
A circuit and method for charging a rechargeable cell is provided. The circuit includes a voltage regulator coupled serially between a power source and a rechargeable cell. The circuit further comprises a controller capable of both monitoring the power dissipation across the voltage regulator and altering the current flowing through the voltage regulator. When the power dissipation in the voltage regulator exceeds a predetermined threshold, the controller increases the current. Where the power source is a linear transformer, this increase of current will cause the transformer to become loaded. The loading causes the transformer output voltage to fall, thereby reducing the power dissipation in the voltage regulator below the predetermined threshold. If, however, the power dissipation does not fall below the predetermined threshold within a predetermined time following the increase of current, the controller will then reduce the current to a level low enough to cause the power dissipation in the voltage regulator to fall below the predetermined threshold. The circuit and method provide a way to rapidly charge batteries while ensuring that the voltage regulator is not subject to thermal compromise.

REFERENCES:
patent: 5815382 (1998-09-01), Saint-Pierre
patent: 6141193 (2000-10-01), Mercer
patent: 6667606 (2003-12-01), Oglesbee et al.
patent: 6674273 (2004-01-01), Oglesbee
patent: 6771051 (2004-08-01), Oglesbee et al.

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