Timer circuit and battery protection circuit using same

Details Timer circuit and battery protection circuit using same Timer circuit and battery protection circuit using same

2005-02-22

2005-02-22

Nguyen, Matthew V. (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

Reexamination Certificate

active

06859022

ABSTRACT:
This invention includes an improvement to a power regulation and thermal management circuit. The power regulation and thermal management circuit includes a pass element coupled serially between a power source and a load. A voltage sensing circuit senses the voltage across the serial element and selects a corresponding current path based upon the sense voltage from a plurality of current paths. The invention includes a timing circuit that periodically, temporarily overrides the selection of current paths. The timing circuit generates a test pulse that temporarily turns all of the current paths on, thereby preventing a discharge lockout condition. The power regulation and thermal management circuit also includes a linear regulator to terminate charging at the appropriate voltage.

REFERENCES:
patent: 5675240 (1997-10-01), Fujisawa et al.
patent: 5757214 (1998-05-01), Stoddard et al.
patent: 6249156 (2001-06-01), Attwood
patent: 6313616 (2001-11-01), Deller et al.

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